@@ -18,22 +18,22 @@
#define ZSTD_DEF_LEVEL 3
struct zstd_ctx {
- ZSTD_CCtx *cctx;
- ZSTD_DCtx *dctx;
+ zstd_cctx *cctx;
+ zstd_dctx *dctx;
void *cwksp;
void *dwksp;
};
-static ZSTD_parameters zstd_params(void)
+static zstd_parameters zstd_params(void)
{
- return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0);
+ return zstd_get_params(ZSTD_DEF_LEVEL, 0);
}
static int zstd_comp_init(struct zstd_ctx *ctx)
{
int ret = 0;
- const ZSTD_parameters params = zstd_params();
- const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams);
+ const zstd_parameters params = zstd_params();
+ const size_t wksp_size = zstd_cctx_workspace_bound(¶ms.cParams);
ctx->cwksp = vzalloc(wksp_size);
if (!ctx->cwksp) {
@@ -41,7 +41,7 @@ static int zstd_comp_init(struct zstd_ctx *ctx)
goto out;
}
- ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size);
+ ctx->cctx = zstd_init_cctx(ctx->cwksp, wksp_size);
if (!ctx->cctx) {
ret = -EINVAL;
goto out_free;
@@ -56,7 +56,7 @@ static int zstd_comp_init(struct zstd_ctx *ctx)
static int zstd_decomp_init(struct zstd_ctx *ctx)
{
int ret = 0;
- const size_t wksp_size = ZSTD_DCtxWorkspaceBound();
+ const size_t wksp_size = zstd_dctx_workspace_bound();
ctx->dwksp = vzalloc(wksp_size);
if (!ctx->dwksp) {
@@ -64,7 +64,7 @@ static int zstd_decomp_init(struct zstd_ctx *ctx)
goto out;
}
- ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size);
+ ctx->dctx = zstd_init_dctx(ctx->dwksp, wksp_size);
if (!ctx->dctx) {
ret = -EINVAL;
goto out_free;
@@ -152,10 +152,10 @@ static int __zstd_compress(const u8 *src, unsigned int slen,
{
size_t out_len;
struct zstd_ctx *zctx = ctx;
- const ZSTD_parameters params = zstd_params();
+ const zstd_parameters params = zstd_params();
- out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params);
- if (ZSTD_isError(out_len))
+ out_len = zstd_compress_cctx(zctx->cctx, dst, *dlen, src, slen, ¶ms);
+ if (zstd_is_error(out_len))
return -EINVAL;
*dlen = out_len;
return 0;
@@ -182,8 +182,8 @@ static int __zstd_decompress(const u8 *src, unsigned int slen,
size_t out_len;
struct zstd_ctx *zctx = ctx;
- out_len = ZSTD_decompressDCtx(zctx->dctx, dst, *dlen, src, slen);
- if (ZSTD_isError(out_len))
+ out_len = zstd_decompress_dctx(zctx->dctx, dst, *dlen, src, slen);
+ if (zstd_is_error(out_len))
return -EINVAL;
*dlen = out_len;
return 0;
@@ -28,10 +28,10 @@
/* 307s to avoid pathologically clashing with transaction commit */
#define ZSTD_BTRFS_RECLAIM_JIFFIES (307 * HZ)
-static ZSTD_parameters zstd_get_btrfs_parameters(unsigned int level,
+static zstd_parameters zstd_get_btrfs_parameters(unsigned int level,
size_t src_len)
{
- ZSTD_parameters params = ZSTD_getParams(level, src_len, 0);
+ zstd_parameters params = zstd_get_params(level, src_len);
if (params.cParams.windowLog > ZSTD_BTRFS_MAX_WINDOWLOG)
params.cParams.windowLog = ZSTD_BTRFS_MAX_WINDOWLOG;
@@ -48,8 +48,8 @@ struct workspace {
unsigned long last_used; /* jiffies */
struct list_head list;
struct list_head lru_list;
- ZSTD_inBuffer in_buf;
- ZSTD_outBuffer out_buf;
+ zstd_in_buffer in_buf;
+ zstd_out_buffer out_buf;
};
/*
@@ -155,12 +155,12 @@ static void zstd_calc_ws_mem_sizes(void)
unsigned int level;
for (level = 1; level <= ZSTD_BTRFS_MAX_LEVEL; level++) {
- ZSTD_parameters params =
+ zstd_parameters params =
zstd_get_btrfs_parameters(level, ZSTD_BTRFS_MAX_INPUT);
size_t level_size =
max_t(size_t,
- ZSTD_CStreamWorkspaceBound(params.cParams),
- ZSTD_DStreamWorkspaceBound(ZSTD_BTRFS_MAX_INPUT));
+ zstd_cstream_workspace_bound(¶ms.cParams),
+ zstd_dstream_workspace_bound(ZSTD_BTRFS_MAX_INPUT));
max_size = max_t(size_t, max_size, level_size);
zstd_ws_mem_sizes[level - 1] = max_size;
@@ -371,7 +371,7 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
unsigned long *total_in, unsigned long *total_out)
{
struct workspace *workspace = list_entry(ws, struct workspace, list);
- ZSTD_CStream *stream;
+ zstd_cstream *stream;
int ret = 0;
int nr_pages = 0;
struct page *in_page = NULL; /* The current page to read */
@@ -381,7 +381,7 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
unsigned long len = *total_out;
const unsigned long nr_dest_pages = *out_pages;
unsigned long max_out = nr_dest_pages * PAGE_SIZE;
- ZSTD_parameters params = zstd_get_btrfs_parameters(workspace->req_level,
+ zstd_parameters params = zstd_get_btrfs_parameters(workspace->req_level,
len);
*out_pages = 0;
@@ -389,10 +389,10 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
*total_in = 0;
/* Initialize the stream */
- stream = ZSTD_initCStream(params, len, workspace->mem,
+ stream = zstd_init_cstream(¶ms, len, workspace->mem,
workspace->size);
if (!stream) {
- pr_warn("BTRFS: ZSTD_initCStream failed\n");
+ pr_warn("BTRFS: zstd_init_cstream failed\n");
ret = -EIO;
goto out;
}
@@ -418,11 +418,11 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
while (1) {
size_t ret2;
- ret2 = ZSTD_compressStream(stream, &workspace->out_buf,
+ ret2 = zstd_compress_stream(stream, &workspace->out_buf,
&workspace->in_buf);
- if (ZSTD_isError(ret2)) {
- pr_debug("BTRFS: ZSTD_compressStream returned %d\n",
- ZSTD_getErrorCode(ret2));
+ if (zstd_is_error(ret2)) {
+ pr_debug("BTRFS: zstd_compress_stream returned %d\n",
+ zstd_get_error_code(ret2));
ret = -EIO;
goto out;
}
@@ -487,10 +487,10 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
while (1) {
size_t ret2;
- ret2 = ZSTD_endStream(stream, &workspace->out_buf);
- if (ZSTD_isError(ret2)) {
- pr_debug("BTRFS: ZSTD_endStream returned %d\n",
- ZSTD_getErrorCode(ret2));
+ ret2 = zstd_end_stream(stream, &workspace->out_buf);
+ if (zstd_is_error(ret2)) {
+ pr_debug("BTRFS: zstd_end_stream returned %d\n",
+ zstd_get_error_code(ret2));
ret = -EIO;
goto out;
}
@@ -550,17 +550,17 @@ int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
u64 disk_start = cb->start;
struct bio *orig_bio = cb->orig_bio;
size_t srclen = cb->compressed_len;
- ZSTD_DStream *stream;
+ zstd_dstream *stream;
int ret = 0;
unsigned long page_in_index = 0;
unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE);
unsigned long buf_start;
unsigned long total_out = 0;
- stream = ZSTD_initDStream(
+ stream = zstd_init_dstream(
ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
if (!stream) {
- pr_debug("BTRFS: ZSTD_initDStream failed\n");
+ pr_debug("BTRFS: zstd_init_dstream failed\n");
ret = -EIO;
goto done;
}
@@ -576,11 +576,11 @@ int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
while (1) {
size_t ret2;
- ret2 = ZSTD_decompressStream(stream, &workspace->out_buf,
+ ret2 = zstd_decompress_stream(stream, &workspace->out_buf,
&workspace->in_buf);
- if (ZSTD_isError(ret2)) {
- pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
- ZSTD_getErrorCode(ret2));
+ if (zstd_is_error(ret2)) {
+ pr_debug("BTRFS: zstd_decompress_stream returned %d\n",
+ zstd_get_error_code(ret2));
ret = -EIO;
goto done;
}
@@ -626,17 +626,17 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
size_t destlen)
{
struct workspace *workspace = list_entry(ws, struct workspace, list);
- ZSTD_DStream *stream;
+ zstd_dstream *stream;
int ret = 0;
size_t ret2;
unsigned long total_out = 0;
unsigned long pg_offset = 0;
char *kaddr;
- stream = ZSTD_initDStream(
+ stream = zstd_init_dstream(
ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
if (!stream) {
- pr_warn("BTRFS: ZSTD_initDStream failed\n");
+ pr_warn("BTRFS: zstd_init_dstream failed\n");
ret = -EIO;
goto finish;
}
@@ -660,15 +660,15 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
/* Check if the frame is over and we still need more input */
if (ret2 == 0) {
- pr_debug("BTRFS: ZSTD_decompressStream ended early\n");
+ pr_debug("BTRFS: zstd_decompress_stream ended early\n");
ret = -EIO;
goto finish;
}
- ret2 = ZSTD_decompressStream(stream, &workspace->out_buf,
+ ret2 = zstd_decompress_stream(stream, &workspace->out_buf,
&workspace->in_buf);
- if (ZSTD_isError(ret2)) {
- pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
- ZSTD_getErrorCode(ret2));
+ if (zstd_is_error(ret2)) {
+ pr_debug("BTRFS: zstd_decompress_stream returned %d\n",
+ zstd_get_error_code(ret2));
ret = -EIO;
goto finish;
}
@@ -351,8 +351,8 @@ static const struct f2fs_compress_ops f2fs_lz4_ops = {
static int zstd_init_compress_ctx(struct compress_ctx *cc)
{
- ZSTD_parameters params;
- ZSTD_CStream *stream;
+ zstd_parameters params;
+ zstd_cstream *stream;
void *workspace;
unsigned int workspace_size;
unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
@@ -361,17 +361,17 @@ static int zstd_init_compress_ctx(struct compress_ctx *cc)
if (!level)
level = F2FS_ZSTD_DEFAULT_CLEVEL;
- params = ZSTD_getParams(level, cc->rlen, 0);
- workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
+ params = zstd_get_params(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen);
+ workspace_size = zstd_cstream_workspace_bound(¶ms.cParams);
workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
workspace_size, GFP_NOFS);
if (!workspace)
return -ENOMEM;
- stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
+ stream = zstd_init_cstream(¶ms, 0, workspace, workspace_size);
if (!stream) {
- printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream failed\n",
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
__func__);
kvfree(workspace);
@@ -394,9 +394,9 @@ static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
static int zstd_compress_pages(struct compress_ctx *cc)
{
- ZSTD_CStream *stream = cc->private2;
- ZSTD_inBuffer inbuf;
- ZSTD_outBuffer outbuf;
+ zstd_cstream *stream = cc->private2;
+ zstd_in_buffer inbuf;
+ zstd_out_buffer outbuf;
int src_size = cc->rlen;
int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
int ret;
@@ -409,19 +409,19 @@ static int zstd_compress_pages(struct compress_ctx *cc)
outbuf.dst = cc->cbuf->cdata;
outbuf.size = dst_size;
- ret = ZSTD_compressStream(stream, &outbuf, &inbuf);
- if (ZSTD_isError(ret)) {
- printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
+ ret = zstd_compress_stream(stream, &outbuf, &inbuf);
+ if (zstd_is_error(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
- __func__, ZSTD_getErrorCode(ret));
+ __func__, zstd_get_error_code(ret));
return -EIO;
}
- ret = ZSTD_endStream(stream, &outbuf);
- if (ZSTD_isError(ret)) {
- printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
+ ret = zstd_end_stream(stream, &outbuf);
+ if (zstd_is_error(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
- __func__, ZSTD_getErrorCode(ret));
+ __func__, zstd_get_error_code(ret));
return -EIO;
}
@@ -438,22 +438,22 @@ static int zstd_compress_pages(struct compress_ctx *cc)
static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
{
- ZSTD_DStream *stream;
+ zstd_dstream *stream;
void *workspace;
unsigned int workspace_size;
unsigned int max_window_size =
MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
- workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
+ workspace_size = zstd_dstream_workspace_bound(max_window_size);
workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
workspace_size, GFP_NOFS);
if (!workspace)
return -ENOMEM;
- stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
+ stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
if (!stream) {
- printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream failed\n",
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
__func__);
kvfree(workspace);
@@ -475,9 +475,9 @@ static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
static int zstd_decompress_pages(struct decompress_io_ctx *dic)
{
- ZSTD_DStream *stream = dic->private2;
- ZSTD_inBuffer inbuf;
- ZSTD_outBuffer outbuf;
+ zstd_dstream *stream = dic->private2;
+ zstd_in_buffer inbuf;
+ zstd_out_buffer outbuf;
int ret;
inbuf.pos = 0;
@@ -488,11 +488,11 @@ static int zstd_decompress_pages(struct decompress_io_ctx *dic)
outbuf.dst = dic->rbuf;
outbuf.size = dic->rlen;
- ret = ZSTD_decompressStream(stream, &outbuf, &inbuf);
- if (ZSTD_isError(ret)) {
- printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
+ ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
+ if (zstd_is_error(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
- __func__, ZSTD_getErrorCode(ret));
+ __func__, zstd_get_error_code(ret));
return -EIO;
}
@@ -525,7 +525,7 @@ static int f2fs_set_zstd_level(struct f2fs_sb_info *sbi, const char *str)
if (kstrtouint(str + 1, 10, &level))
return -EINVAL;
- if (!level || level > ZSTD_maxCLevel()) {
+ if (!level || level > zstd_max_clevel()) {
f2fs_info(sbi, "invalid zstd compress level: %d", level);
return -EINVAL;
}
@@ -218,7 +218,7 @@ static int zbufsize_842(size_t size)
#if IS_ENABLED(CONFIG_PSTORE_ZSTD_COMPRESS)
static int zbufsize_zstd(size_t size)
{
- return ZSTD_compressBound(size);
+ return zstd_compress_bound(size);
}
#endif
@@ -34,7 +34,7 @@ static void *zstd_init(struct squashfs_sb_info *msblk, void *buff)
goto failed;
wksp->window_size = max_t(size_t,
msblk->block_size, SQUASHFS_METADATA_SIZE);
- wksp->mem_size = ZSTD_DStreamWorkspaceBound(wksp->window_size);
+ wksp->mem_size = zstd_dstream_workspace_bound(wksp->window_size);
wksp->mem = vmalloc(wksp->mem_size);
if (wksp->mem == NULL)
goto failed;
@@ -63,15 +63,15 @@ static int zstd_uncompress(struct squashfs_sb_info *msblk, void *strm,
struct squashfs_page_actor *output)
{
struct workspace *wksp = strm;
- ZSTD_DStream *stream;
+ zstd_dstream *stream;
size_t total_out = 0;
int error = 0;
- ZSTD_inBuffer in_buf = { NULL, 0, 0 };
- ZSTD_outBuffer out_buf = { NULL, 0, 0 };
+ zstd_in_buffer in_buf = { NULL, 0, 0 };
+ zstd_out_buffer out_buf = { NULL, 0, 0 };
struct bvec_iter_all iter_all = {};
struct bio_vec *bvec = bvec_init_iter_all(&iter_all);
- stream = ZSTD_initDStream(wksp->window_size, wksp->mem, wksp->mem_size);
+ stream = zstd_init_dstream(wksp->window_size, wksp->mem, wksp->mem_size);
if (!stream) {
ERROR("Failed to initialize zstd decompressor\n");
@@ -116,14 +116,14 @@ static int zstd_uncompress(struct squashfs_sb_info *msblk, void *strm,
}
total_out -= out_buf.pos;
- zstd_err = ZSTD_decompressStream(stream, &out_buf, &in_buf);
+ zstd_err = zstd_decompress_stream(stream, &out_buf, &in_buf);
total_out += out_buf.pos; /* add the additional data produced */
if (zstd_err == 0)
break;
- if (ZSTD_isError(zstd_err)) {
+ if (zstd_is_error(zstd_err)) {
ERROR("zstd decompression error: %d\n",
- (int)ZSTD_getErrorCode(zstd_err));
+ (int)zstd_get_error_code(zstd_err));
error = -EIO;
break;
}
@@ -1,138 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
* All rights reserved.
*
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of https://github.com/facebook/zstd.
- * An additional grant of patent rights can be found in the PATENTS file in the
- * same directory.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of https://github.com/facebook/zstd) and
+ * the GPLv2 (found in the COPYING file in the root directory of
+ * https://github.com/facebook/zstd). You may select, at your option, one of the
+ * above-listed licenses.
*/
-#ifndef ZSTD_H
-#define ZSTD_H
+#ifndef LINUX_ZSTD_H
+#define LINUX_ZSTD_H
-/* ====== Dependency ======*/
-#include <linux/types.h> /* size_t */
+/**
+ * This is a kernel-style API that wraps the upstream zstd API, which cannot be
+ * used directly because the symbols aren't exported. It exposes the minimal
+ * functionality which is currently required by users of zstd in the kernel.
+ * Expose extra functions from lib/zstd/zstd.h as needed.
+ */
+/* ====== Dependency ====== */
+#include <linux/types.h>
+#include <linux/zstd_lib.h>
-/*-*****************************************************************************
- * Introduction
+/* ====== Helper Functions ====== */
+/**
+ * zstd_compress_bound() - maximum compressed size in worst case scenario
+ * @src_size: The size of the data to compress.
*
- * zstd, short for Zstandard, is a fast lossless compression algorithm,
- * targeting real-time compression scenarios at zlib-level and better
- * compression ratios. The zstd compression library provides in-memory
- * compression and decompression functions. The library supports compression
- * levels from 1 up to ZSTD_maxCLevel() which is 22. Levels >= 20, labeled
- * ultra, should be used with caution, as they require more memory.
- * Compression can be done in:
- * - a single step, reusing a context (described as Explicit memory management)
- * - unbounded multiple steps (described as Streaming compression)
- * The compression ratio achievable on small data can be highly improved using
- * compression with a dictionary in:
- * - a single step (described as Simple dictionary API)
- * - a single step, reusing a dictionary (described as Fast dictionary API)
- ******************************************************************************/
-
-/*====== Helper functions ======*/
+ * Return: The maximum compressed size in the worst case scenario.
+ */
+size_t zstd_compress_bound(size_t src_size);
/**
- * enum ZSTD_ErrorCode - zstd error codes
+ * zstd_is_error() - tells if a size_t function result is an error code
+ * @code: The function result to check for error.
*
- * Functions that return size_t can be checked for errors using ZSTD_isError()
- * and the ZSTD_ErrorCode can be extracted using ZSTD_getErrorCode().
+ * Return: Non-zero iff the code is an error.
+ */
+unsigned int zstd_is_error(size_t code);
+
+/**
+ * enum zstd_error_code - zstd error codes
*/
-typedef enum {
- ZSTD_error_no_error,
- ZSTD_error_GENERIC,
- ZSTD_error_prefix_unknown,
- ZSTD_error_version_unsupported,
- ZSTD_error_parameter_unknown,
- ZSTD_error_frameParameter_unsupported,
- ZSTD_error_frameParameter_unsupportedBy32bits,
- ZSTD_error_frameParameter_windowTooLarge,
- ZSTD_error_compressionParameter_unsupported,
- ZSTD_error_init_missing,
- ZSTD_error_memory_allocation,
- ZSTD_error_stage_wrong,
- ZSTD_error_dstSize_tooSmall,
- ZSTD_error_srcSize_wrong,
- ZSTD_error_corruption_detected,
- ZSTD_error_checksum_wrong,
- ZSTD_error_tableLog_tooLarge,
- ZSTD_error_maxSymbolValue_tooLarge,
- ZSTD_error_maxSymbolValue_tooSmall,
- ZSTD_error_dictionary_corrupted,
- ZSTD_error_dictionary_wrong,
- ZSTD_error_dictionaryCreation_failed,
- ZSTD_error_maxCode
-} ZSTD_ErrorCode;
+typedef ZSTD_ErrorCode zstd_error_code;
/**
- * ZSTD_maxCLevel() - maximum compression level available
+ * zstd_get_error_code() - translates an error function result to an error code
+ * @code: The function result for which zstd_is_error(code) is true.
*
- * Return: Maximum compression level available.
+ * Return: A unique error code for this error.
*/
-int ZSTD_maxCLevel(void);
+zstd_error_code zstd_get_error_code(size_t code);
+
/**
- * ZSTD_compressBound() - maximum compressed size in worst case scenario
- * @srcSize: The size of the data to compress.
+ * zstd_get_error_name() - translates an error function result to a string
+ * @code: The function result for which zstd_is_error(code) is true.
*
- * Return: The maximum compressed size in the worst case scenario.
+ * Return: An error string corresponding to the error code.
*/
-size_t ZSTD_compressBound(size_t srcSize);
+const char *zstd_get_error_name(size_t code);
+
/**
- * ZSTD_isError() - tells if a size_t function result is an error code
- * @code: The function result to check for error.
+ * zstd_min_clevel() - minimum allowed compression level
*
- * Return: Non-zero iff the code is an error.
+ * Return: The minimum allowed compression level.
*/
-static __attribute__((unused)) unsigned int ZSTD_isError(size_t code)
-{
- return code > (size_t)-ZSTD_error_maxCode;
-}
+int zstd_min_clevel(void);
+
/**
- * ZSTD_getErrorCode() - translates an error function result to a ZSTD_ErrorCode
- * @functionResult: The result of a function for which ZSTD_isError() is true.
+ * zstd_max_clevel() - maximum allowed compression level
*
- * Return: The ZSTD_ErrorCode corresponding to the functionResult or 0
- * if the functionResult isn't an error.
+ * Return: The maximum allowed compression level.
*/
-static __attribute__((unused)) ZSTD_ErrorCode ZSTD_getErrorCode(
- size_t functionResult)
-{
- if (!ZSTD_isError(functionResult))
- return (ZSTD_ErrorCode)0;
- return (ZSTD_ErrorCode)(0 - functionResult);
-}
+int zstd_max_clevel(void);
+
+/* ====== Parameter Selection ====== */
/**
- * enum ZSTD_strategy - zstd compression search strategy
+ * enum zstd_strategy - zstd compression search strategy
*
- * From faster to stronger.
+ * From faster to stronger. See zstd_lib.h.
*/
-typedef enum {
- ZSTD_fast,
- ZSTD_dfast,
- ZSTD_greedy,
- ZSTD_lazy,
- ZSTD_lazy2,
- ZSTD_btlazy2,
- ZSTD_btopt,
- ZSTD_btopt2
-} ZSTD_strategy;
+typedef ZSTD_strategy zstd_strategy;
/**
- * struct ZSTD_compressionParameters - zstd compression parameters
+ * struct zstd_compression_parameters - zstd compression parameters
* @windowLog: Log of the largest match distance. Larger means more
* compression, and more memory needed during decompression.
- * @chainLog: Fully searched segment. Larger means more compression, slower,
- * and more memory (useless for fast).
+ * @chainLog: Fully searched segment. Larger means more compression,
+ * slower, and more memory (useless for fast).
* @hashLog: Dispatch table. Larger means more compression,
* slower, and more memory.
* @searchLog: Number of searches. Larger means more compression and slower.
@@ -141,1017 +99,342 @@ typedef enum {
* @targetLength: Acceptable match size for optimal parser (only). Larger means
* more compression, and slower.
* @strategy: The zstd compression strategy.
+ *
+ * See zstd_lib.h.
*/
-typedef struct {
- unsigned int windowLog;
- unsigned int chainLog;
- unsigned int hashLog;
- unsigned int searchLog;
- unsigned int searchLength;
- unsigned int targetLength;
- ZSTD_strategy strategy;
-} ZSTD_compressionParameters;
+typedef ZSTD_compressionParameters zstd_compression_parameters;
/**
- * struct ZSTD_frameParameters - zstd frame parameters
- * @contentSizeFlag: Controls whether content size will be present in the frame
- * header (when known).
- * @checksumFlag: Controls whether a 32-bit checksum is generated at the end
- * of the frame for error detection.
- * @noDictIDFlag: Controls whether dictID will be saved into the frame header
- * when using dictionary compression.
+ * struct zstd_frame_parameters - zstd frame parameters
+ * @contentSizeFlag: Controls whether content size will be present in the
+ * frame header (when known).
+ * @checksumFlag: Controls whether a 32-bit checksum is generated at the
+ * end of the frame for error detection.
+ * @noDictIDFlag: Controls whether dictID will be saved into the frame
+ * header when using dictionary compression.
*
- * The default value is all fields set to 0.
+ * The default value is all fields set to 0. See zstd_lib.h.
*/
-typedef struct {
- unsigned int contentSizeFlag;
- unsigned int checksumFlag;
- unsigned int noDictIDFlag;
-} ZSTD_frameParameters;
+typedef ZSTD_frameParameters zstd_frame_parameters;
/**
- * struct ZSTD_parameters - zstd parameters
+ * struct zstd_parameters - zstd parameters
* @cParams: The compression parameters.
* @fParams: The frame parameters.
*/
-typedef struct {
- ZSTD_compressionParameters cParams;
- ZSTD_frameParameters fParams;
-} ZSTD_parameters;
+typedef ZSTD_parameters zstd_parameters;
/**
- * ZSTD_getCParams() - returns ZSTD_compressionParameters for selected level
- * @compressionLevel: The compression level from 1 to ZSTD_maxCLevel().
- * @estimatedSrcSize: The estimated source size to compress or 0 if unknown.
- * @dictSize: The dictionary size or 0 if a dictionary isn't being used.
+ * zstd_get_params() - returns zstd_parameters for selected level
+ * @level: The compression level
+ * @estimated_src_size: The estimated source size to compress or 0
+ * if unknown.
*
- * Return: The selected ZSTD_compressionParameters.
+ * Return: The selected zstd_parameters.
*/
-ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel,
- unsigned long long estimatedSrcSize, size_t dictSize);
+zstd_parameters zstd_get_params(int level,
+ unsigned long long estimated_src_size);
-/**
- * ZSTD_getParams() - returns ZSTD_parameters for selected level
- * @compressionLevel: The compression level from 1 to ZSTD_maxCLevel().
- * @estimatedSrcSize: The estimated source size to compress or 0 if unknown.
- * @dictSize: The dictionary size or 0 if a dictionary isn't being used.
- *
- * The same as ZSTD_getCParams() except also selects the default frame
- * parameters (all zero).
- *
- * Return: The selected ZSTD_parameters.
- */
-ZSTD_parameters ZSTD_getParams(int compressionLevel,
- unsigned long long estimatedSrcSize, size_t dictSize);
+/* ====== Single-pass Compression ====== */
-/*-*************************************
- * Explicit memory management
- **************************************/
+typedef ZSTD_CCtx zstd_cctx;
/**
- * ZSTD_CCtxWorkspaceBound() - amount of memory needed to initialize a ZSTD_CCtx
- * @cParams: The compression parameters to be used for compression.
+ * zstd_cctx_workspace_bound() - max memory needed to initialize a zstd_cctx
+ * @parameters: The compression parameters to be used.
*
* If multiple compression parameters might be used, the caller must call
- * ZSTD_CCtxWorkspaceBound() for each set of parameters and use the maximum
+ * zstd_cctx_workspace_bound() for each set of parameters and use the maximum
* size.
*
- * Return: A lower bound on the size of the workspace that is passed to
- * ZSTD_initCCtx().
+ * Return: A lower bound on the size of the workspace that is passed to
+ * zstd_init_cctx().
*/
-size_t ZSTD_CCtxWorkspaceBound(ZSTD_compressionParameters cParams);
+size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *parameters);
/**
- * struct ZSTD_CCtx - the zstd compression context
- *
- * When compressing many times it is recommended to allocate a context just once
- * and reuse it for each successive compression operation.
- */
-typedef struct ZSTD_CCtx_s ZSTD_CCtx;
-/**
- * ZSTD_initCCtx() - initialize a zstd compression context
- * @workspace: The workspace to emplace the context into. It must outlive
- * the returned context.
- * @workspaceSize: The size of workspace. Use ZSTD_CCtxWorkspaceBound() to
- * determine how large the workspace must be.
- *
- * Return: A compression context emplaced into workspace.
- */
-ZSTD_CCtx *ZSTD_initCCtx(void *workspace, size_t workspaceSize);
-
-/**
- * ZSTD_compressCCtx() - compress src into dst
- * @ctx: The context. Must have been initialized with a workspace at
- * least as large as ZSTD_CCtxWorkspaceBound(params.cParams).
- * @dst: The buffer to compress src into.
- * @dstCapacity: The size of the destination buffer. May be any size, but
- * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
- * @src: The data to compress.
- * @srcSize: The size of the data to compress.
- * @params: The parameters to use for compression. See ZSTD_getParams().
- *
- * Return: The compressed size or an error, which can be checked using
- * ZSTD_isError().
- */
-size_t ZSTD_compressCCtx(ZSTD_CCtx *ctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize, ZSTD_parameters params);
-
-/**
- * ZSTD_DCtxWorkspaceBound() - amount of memory needed to initialize a ZSTD_DCtx
- *
- * Return: A lower bound on the size of the workspace that is passed to
- * ZSTD_initDCtx().
- */
-size_t ZSTD_DCtxWorkspaceBound(void);
-
-/**
- * struct ZSTD_DCtx - the zstd decompression context
- *
- * When decompressing many times it is recommended to allocate a context just
- * once and reuse it for each successive decompression operation.
- */
-typedef struct ZSTD_DCtx_s ZSTD_DCtx;
-/**
- * ZSTD_initDCtx() - initialize a zstd decompression context
- * @workspace: The workspace to emplace the context into. It must outlive
- * the returned context.
- * @workspaceSize: The size of workspace. Use ZSTD_DCtxWorkspaceBound() to
- * determine how large the workspace must be.
- *
- * Return: A decompression context emplaced into workspace.
- */
-ZSTD_DCtx *ZSTD_initDCtx(void *workspace, size_t workspaceSize);
-
-/**
- * ZSTD_decompressDCtx() - decompress zstd compressed src into dst
- * @ctx: The decompression context.
- * @dst: The buffer to decompress src into.
- * @dstCapacity: The size of the destination buffer. Must be at least as large
- * as the decompressed size. If the caller cannot upper bound the
- * decompressed size, then it's better to use the streaming API.
- * @src: The zstd compressed data to decompress. Multiple concatenated
- * frames and skippable frames are allowed.
- * @srcSize: The exact size of the data to decompress.
- *
- * Return: The decompressed size or an error, which can be checked using
- * ZSTD_isError().
- */
-size_t ZSTD_decompressDCtx(ZSTD_DCtx *ctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize);
-
-/*-************************
- * Simple dictionary API
- **************************/
-
-/**
- * ZSTD_compress_usingDict() - compress src into dst using a dictionary
- * @ctx: The context. Must have been initialized with a workspace at
- * least as large as ZSTD_CCtxWorkspaceBound(params.cParams).
- * @dst: The buffer to compress src into.
- * @dstCapacity: The size of the destination buffer. May be any size, but
- * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
- * @src: The data to compress.
- * @srcSize: The size of the data to compress.
- * @dict: The dictionary to use for compression.
- * @dictSize: The size of the dictionary.
- * @params: The parameters to use for compression. See ZSTD_getParams().
- *
- * Compression using a predefined dictionary. The same dictionary must be used
- * during decompression.
- *
- * Return: The compressed size or an error, which can be checked using
- * ZSTD_isError().
- */
-size_t ZSTD_compress_usingDict(ZSTD_CCtx *ctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize, const void *dict, size_t dictSize,
- ZSTD_parameters params);
-
-/**
- * ZSTD_decompress_usingDict() - decompress src into dst using a dictionary
- * @ctx: The decompression context.
- * @dst: The buffer to decompress src into.
- * @dstCapacity: The size of the destination buffer. Must be at least as large
- * as the decompressed size. If the caller cannot upper bound the
- * decompressed size, then it's better to use the streaming API.
- * @src: The zstd compressed data to decompress. Multiple concatenated
- * frames and skippable frames are allowed.
- * @srcSize: The exact size of the data to decompress.
- * @dict: The dictionary to use for decompression. The same dictionary
- * must've been used to compress the data.
- * @dictSize: The size of the dictionary.
- *
- * Return: The decompressed size or an error, which can be checked using
- * ZSTD_isError().
- */
-size_t ZSTD_decompress_usingDict(ZSTD_DCtx *ctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize, const void *dict, size_t dictSize);
-
-/*-**************************
- * Fast dictionary API
- ***************************/
-
-/**
- * ZSTD_CDictWorkspaceBound() - memory needed to initialize a ZSTD_CDict
- * @cParams: The compression parameters to be used for compression.
+ * zstd_init_cctx() - initialize a zstd compression context
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspace_size: The size of workspace. Use zstd_cctx_workspace_bound() to
+ * determine how large the workspace must be.
*
- * Return: A lower bound on the size of the workspace that is passed to
- * ZSTD_initCDict().
- */
-size_t ZSTD_CDictWorkspaceBound(ZSTD_compressionParameters cParams);
-
-/**
- * struct ZSTD_CDict - a digested dictionary to be used for compression
+ * Return: A zstd compression context or NULL on error.
*/
-typedef struct ZSTD_CDict_s ZSTD_CDict;
+zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size);
/**
- * ZSTD_initCDict() - initialize a digested dictionary for compression
- * @dictBuffer: The dictionary to digest. The buffer is referenced by the
- * ZSTD_CDict so it must outlive the returned ZSTD_CDict.
- * @dictSize: The size of the dictionary.
- * @params: The parameters to use for compression. See ZSTD_getParams().
- * @workspace: The workspace. It must outlive the returned ZSTD_CDict.
- * @workspaceSize: The workspace size. Must be at least
- * ZSTD_CDictWorkspaceBound(params.cParams).
+ * zstd_compress_cctx() - compress src into dst with the initialized parameters
+ * @cctx: The context. Must have been initialized with zstd_init_cctx().
+ * @dst: The buffer to compress src into.
+ * @dst_capacity: The size of the destination buffer. May be any size, but
+ * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
+ * @src: The data to compress.
+ * @src_size: The size of the data to compress.
+ * @parameters: The compression parameters to be used.
*
- * When compressing multiple messages / blocks with the same dictionary it is
- * recommended to load it just once. The ZSTD_CDict merely references the
- * dictBuffer, so it must outlive the returned ZSTD_CDict.
- *
- * Return: The digested dictionary emplaced into workspace.
+ * Return: The compressed size or an error, which can be checked using
+ * zstd_is_error().
*/
-ZSTD_CDict *ZSTD_initCDict(const void *dictBuffer, size_t dictSize,
- ZSTD_parameters params, void *workspace, size_t workspaceSize);
+size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
+ const void *src, size_t src_size, const zstd_parameters *parameters);
-/**
- * ZSTD_compress_usingCDict() - compress src into dst using a ZSTD_CDict
- * @ctx: The context. Must have been initialized with a workspace at
- * least as large as ZSTD_CCtxWorkspaceBound(cParams) where
- * cParams are the compression parameters used to initialize the
- * cdict.
- * @dst: The buffer to compress src into.
- * @dstCapacity: The size of the destination buffer. May be any size, but
- * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
- * @src: The data to compress.
- * @srcSize: The size of the data to compress.
- * @cdict: The digested dictionary to use for compression.
- * @params: The parameters to use for compression. See ZSTD_getParams().
- *
- * Compression using a digested dictionary. The same dictionary must be used
- * during decompression.
- *
- * Return: The compressed size or an error, which can be checked using
- * ZSTD_isError().
- */
-size_t ZSTD_compress_usingCDict(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize, const ZSTD_CDict *cdict);
+/* ====== Single-pass Decompression ====== */
+typedef ZSTD_DCtx zstd_dctx;
/**
- * ZSTD_DDictWorkspaceBound() - memory needed to initialize a ZSTD_DDict
+ * zstd_dctx_workspace_bound() - max memory needed to initialize a zstd_dctx
*
- * Return: A lower bound on the size of the workspace that is passed to
- * ZSTD_initDDict().
- */
-size_t ZSTD_DDictWorkspaceBound(void);
-
-/**
- * struct ZSTD_DDict - a digested dictionary to be used for decompression
+ * Return: A lower bound on the size of the workspace that is passed to
+ * zstd_init_dctx().
*/
-typedef struct ZSTD_DDict_s ZSTD_DDict;
+size_t zstd_dctx_workspace_bound(void);
/**
- * ZSTD_initDDict() - initialize a digested dictionary for decompression
- * @dictBuffer: The dictionary to digest. The buffer is referenced by the
- * ZSTD_DDict so it must outlive the returned ZSTD_DDict.
- * @dictSize: The size of the dictionary.
- * @workspace: The workspace. It must outlive the returned ZSTD_DDict.
- * @workspaceSize: The workspace size. Must be at least
- * ZSTD_DDictWorkspaceBound().
- *
- * When decompressing multiple messages / blocks with the same dictionary it is
- * recommended to load it just once. The ZSTD_DDict merely references the
- * dictBuffer, so it must outlive the returned ZSTD_DDict.
+ * zstd_init_dctx() - initialize a zstd decompression context
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspace_size: The size of workspace. Use zstd_dctx_workspace_bound() to
+ * determine how large the workspace must be.
*
- * Return: The digested dictionary emplaced into workspace.
+ * Return: A zstd decompression context or NULL on error.
*/
-ZSTD_DDict *ZSTD_initDDict(const void *dictBuffer, size_t dictSize,
- void *workspace, size_t workspaceSize);
+zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size);
/**
- * ZSTD_decompress_usingDDict() - decompress src into dst using a ZSTD_DDict
- * @ctx: The decompression context.
- * @dst: The buffer to decompress src into.
- * @dstCapacity: The size of the destination buffer. Must be at least as large
- * as the decompressed size. If the caller cannot upper bound the
- * decompressed size, then it's better to use the streaming API.
- * @src: The zstd compressed data to decompress. Multiple concatenated
- * frames and skippable frames are allowed.
- * @srcSize: The exact size of the data to decompress.
- * @ddict: The digested dictionary to use for decompression. The same
- * dictionary must've been used to compress the data.
+ * zstd_decompress_dctx() - decompress zstd compressed src into dst
+ * @dctx: The decompression context.
+ * @dst: The buffer to decompress src into.
+ * @dst_capacity: The size of the destination buffer. Must be at least as large
+ * as the decompressed size. If the caller cannot upper bound the
+ * decompressed size, then it's better to use the streaming API.
+ * @src: The zstd compressed data to decompress. Multiple concatenated
+ * frames and skippable frames are allowed.
+ * @src_size: The exact size of the data to decompress.
*
- * Return: The decompressed size or an error, which can be checked using
- * ZSTD_isError().
+ * Return: The decompressed size or an error, which can be checked using
+ * zstd_is_error().
*/
-size_t ZSTD_decompress_usingDDict(ZSTD_DCtx *dctx, void *dst,
- size_t dstCapacity, const void *src, size_t srcSize,
- const ZSTD_DDict *ddict);
+size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
+ const void *src, size_t src_size);
-
-/*-**************************
- * Streaming
- ***************************/
+/* ====== Streaming Buffers ====== */
/**
- * struct ZSTD_inBuffer - input buffer for streaming
+ * struct zstd_in_buffer - input buffer for streaming
* @src: Start of the input buffer.
* @size: Size of the input buffer.
* @pos: Position where reading stopped. Will be updated.
* Necessarily 0 <= pos <= size.
+ *
+ * See zstd_lib.h.
*/
-typedef struct ZSTD_inBuffer_s {
- const void *src;
- size_t size;
- size_t pos;
-} ZSTD_inBuffer;
+typedef ZSTD_inBuffer zstd_in_buffer;
/**
- * struct ZSTD_outBuffer - output buffer for streaming
+ * struct zstd_out_buffer - output buffer for streaming
* @dst: Start of the output buffer.
* @size: Size of the output buffer.
* @pos: Position where writing stopped. Will be updated.
* Necessarily 0 <= pos <= size.
+ *
+ * See zstd_lib.h.
*/
-typedef struct ZSTD_outBuffer_s {
- void *dst;
- size_t size;
- size_t pos;
-} ZSTD_outBuffer;
+typedef ZSTD_outBuffer zstd_out_buffer;
+/* ====== Streaming Compression ====== */
-
-/*-*****************************************************************************
- * Streaming compression - HowTo
- *
- * A ZSTD_CStream object is required to track streaming operation.
- * Use ZSTD_initCStream() to initialize a ZSTD_CStream object.
- * ZSTD_CStream objects can be reused multiple times on consecutive compression
- * operations. It is recommended to re-use ZSTD_CStream in situations where many
- * streaming operations will be achieved consecutively. Use one separate
- * ZSTD_CStream per thread for parallel execution.
- *
- * Use ZSTD_compressStream() repetitively to consume input stream.
- * The function will automatically update both `pos` fields.
- * Note that it may not consume the entire input, in which case `pos < size`,
- * and it's up to the caller to present again remaining data.
- * It returns a hint for the preferred number of bytes to use as an input for
- * the next function call.
- *
- * At any moment, it's possible to flush whatever data remains within internal
- * buffer, using ZSTD_flushStream(). `output->pos` will be updated. There might
- * still be some content left within the internal buffer if `output->size` is
- * too small. It returns the number of bytes left in the internal buffer and
- * must be called until it returns 0.
- *
- * ZSTD_endStream() instructs to finish a frame. It will perform a flush and
- * write frame epilogue. The epilogue is required for decoders to consider a
- * frame completed. Similar to ZSTD_flushStream(), it may not be able to flush
- * the full content if `output->size` is too small. In which case, call again
- * ZSTD_endStream() to complete the flush. It returns the number of bytes left
- * in the internal buffer and must be called until it returns 0.
- ******************************************************************************/
+typedef ZSTD_CStream zstd_cstream;
/**
- * ZSTD_CStreamWorkspaceBound() - memory needed to initialize a ZSTD_CStream
- * @cParams: The compression parameters to be used for compression.
+ * zstd_cstream_workspace_bound() - memory needed to initialize a zstd_cstream
+ * @cparams: The compression parameters to be used for compression.
*
* Return: A lower bound on the size of the workspace that is passed to
- * ZSTD_initCStream() and ZSTD_initCStream_usingCDict().
- */
-size_t ZSTD_CStreamWorkspaceBound(ZSTD_compressionParameters cParams);
-
-/**
- * struct ZSTD_CStream - the zstd streaming compression context
+ * zstd_init_cstream().
*/
-typedef struct ZSTD_CStream_s ZSTD_CStream;
+size_t zstd_cstream_workspace_bound(const zstd_compression_parameters *cparams);
-/*===== ZSTD_CStream management functions =====*/
/**
- * ZSTD_initCStream() - initialize a zstd streaming compression context
- * @params: The zstd compression parameters.
- * @pledgedSrcSize: If params.fParams.contentSizeFlag == 1 then the caller must
- * pass the source size (zero means empty source). Otherwise,
- * the caller may optionally pass the source size, or zero if
- * unknown.
- * @workspace: The workspace to emplace the context into. It must outlive
- * the returned context.
- * @workspaceSize: The size of workspace.
- * Use ZSTD_CStreamWorkspaceBound(params.cParams) to determine
- * how large the workspace must be.
+ * zstd_init_cstream() - initialize a zstd streaming compression context
+ * @parameters The zstd parameters to use for compression.
+ * @pledged_src_size: If params.fParams.contentSizeFlag == 1 then the caller
+ * must pass the source size (zero means empty source).
+ * Otherwise, the caller may optionally pass the source
+ * size, or zero if unknown.
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspace_size: The size of workspace.
+ * Use zstd_cstream_workspace_bound(params->cparams) to
+ * determine how large the workspace must be.
*
- * Return: The zstd streaming compression context.
+ * Return: The zstd streaming compression context or NULL on error.
*/
-ZSTD_CStream *ZSTD_initCStream(ZSTD_parameters params,
- unsigned long long pledgedSrcSize, void *workspace,
- size_t workspaceSize);
+zstd_cstream *zstd_init_cstream(const zstd_parameters *parameters,
+ unsigned long long pledged_src_size, void *workspace, size_t workspace_size);
/**
- * ZSTD_initCStream_usingCDict() - initialize a streaming compression context
- * @cdict: The digested dictionary to use for compression.
- * @pledgedSrcSize: Optionally the source size, or zero if unknown.
- * @workspace: The workspace to emplace the context into. It must outlive
- * the returned context.
- * @workspaceSize: The size of workspace. Call ZSTD_CStreamWorkspaceBound()
- * with the cParams used to initialize the cdict to determine
- * how large the workspace must be.
- *
- * Return: The zstd streaming compression context.
- */
-ZSTD_CStream *ZSTD_initCStream_usingCDict(const ZSTD_CDict *cdict,
- unsigned long long pledgedSrcSize, void *workspace,
- size_t workspaceSize);
-
-/*===== Streaming compression functions =====*/
-/**
- * ZSTD_resetCStream() - reset the context using parameters from creation
- * @zcs: The zstd streaming compression context to reset.
- * @pledgedSrcSize: Optionally the source size, or zero if unknown.
+ * zstd_reset_cstream() - reset the context using parameters from creation
+ * @cstream: The zstd streaming compression context to reset.
+ * @pledged_src_size: Optionally the source size, or zero if unknown.
*
* Resets the context using the parameters from creation. Skips dictionary
- * loading, since it can be reused. If `pledgedSrcSize` is non-zero the frame
+ * loading, since it can be reused. If `pledged_src_size` is non-zero the frame
* content size is always written into the frame header.
*
- * Return: Zero or an error, which can be checked using ZSTD_isError().
+ * Return: Zero or an error, which can be checked using
+ * zstd_is_error().
*/
-size_t ZSTD_resetCStream(ZSTD_CStream *zcs, unsigned long long pledgedSrcSize);
+size_t zstd_reset_cstream(zstd_cstream *cstream,
+ unsigned long long pledged_src_size);
+
/**
- * ZSTD_compressStream() - streaming compress some of input into output
- * @zcs: The zstd streaming compression context.
- * @output: Destination buffer. `output->pos` is updated to indicate how much
- * compressed data was written.
- * @input: Source buffer. `input->pos` is updated to indicate how much data was
- * read. Note that it may not consume the entire input, in which case
- * `input->pos < input->size`, and it's up to the caller to present
- * remaining data again.
+ * zstd_compress_stream() - streaming compress some of input into output
+ * @cstream: The zstd streaming compression context.
+ * @output: Destination buffer. `output->pos` is updated to indicate how much
+ * compressed data was written.
+ * @input: Source buffer. `input->pos` is updated to indicate how much data
+ * was read. Note that it may not consume the entire input, in which
+ * case `input->pos < input->size`, and it's up to the caller to
+ * present remaining data again.
*
* The `input` and `output` buffers may be any size. Guaranteed to make some
* forward progress if `input` and `output` are not empty.
*
- * Return: A hint for the number of bytes to use as the input for the next
- * function call or an error, which can be checked using
- * ZSTD_isError().
+ * Return: A hint for the number of bytes to use as the input for the next
+ * function call or an error, which can be checked using
+ * zstd_is_error().
*/
-size_t ZSTD_compressStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output,
- ZSTD_inBuffer *input);
+size_t zstd_compress_stream(zstd_cstream *cstream, zstd_out_buffer *output,
+ zstd_in_buffer *input);
+
/**
- * ZSTD_flushStream() - flush internal buffers into output
- * @zcs: The zstd streaming compression context.
- * @output: Destination buffer. `output->pos` is updated to indicate how much
- * compressed data was written.
+ * zstd_flush_stream() - flush internal buffers into output
+ * @cstream: The zstd streaming compression context.
+ * @output: Destination buffer. `output->pos` is updated to indicate how much
+ * compressed data was written.
*
- * ZSTD_flushStream() must be called until it returns 0, meaning all the data
- * has been flushed. Since ZSTD_flushStream() causes a block to be ended,
+ * zstd_flush_stream() must be called until it returns 0, meaning all the data
+ * has been flushed. Since zstd_flush_stream() causes a block to be ended,
* calling it too often will degrade the compression ratio.
*
- * Return: The number of bytes still present within internal buffers or an
- * error, which can be checked using ZSTD_isError().
- */
-size_t ZSTD_flushStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output);
-/**
- * ZSTD_endStream() - flush internal buffers into output and end the frame
- * @zcs: The zstd streaming compression context.
- * @output: Destination buffer. `output->pos` is updated to indicate how much
- * compressed data was written.
- *
- * ZSTD_endStream() must be called until it returns 0, meaning all the data has
- * been flushed and the frame epilogue has been written.
- *
- * Return: The number of bytes still present within internal buffers or an
- * error, which can be checked using ZSTD_isError().
+ * Return: The number of bytes still present within internal buffers or an
+ * error, which can be checked using zstd_is_error().
*/
-size_t ZSTD_endStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output);
+size_t zstd_flush_stream(zstd_cstream *cstream, zstd_out_buffer *output);
/**
- * ZSTD_CStreamInSize() - recommended size for the input buffer
- *
- * Return: The recommended size for the input buffer.
- */
-size_t ZSTD_CStreamInSize(void);
-/**
- * ZSTD_CStreamOutSize() - recommended size for the output buffer
+ * zstd_end_stream() - flush internal buffers into output and end the frame
+ * @cstream: The zstd streaming compression context.
+ * @output: Destination buffer. `output->pos` is updated to indicate how much
+ * compressed data was written.
*
- * When the output buffer is at least this large, it is guaranteed to be large
- * enough to flush at least one complete compressed block.
+ * zstd_end_stream() must be called until it returns 0, meaning all the data has
+ * been flushed and the frame epilogue has been written.
*
- * Return: The recommended size for the output buffer.
+ * Return: The number of bytes still present within internal buffers or an
+ * error, which can be checked using zstd_is_error().
*/
-size_t ZSTD_CStreamOutSize(void);
+size_t zstd_end_stream(zstd_cstream *cstream, zstd_out_buffer *output);
+/* ====== Streaming Decompression ====== */
-
-/*-*****************************************************************************
- * Streaming decompression - HowTo
- *
- * A ZSTD_DStream object is required to track streaming operations.
- * Use ZSTD_initDStream() to initialize a ZSTD_DStream object.
- * ZSTD_DStream objects can be re-used multiple times.
- *
- * Use ZSTD_decompressStream() repetitively to consume your input.
- * The function will update both `pos` fields.
- * If `input->pos < input->size`, some input has not been consumed.
- * It's up to the caller to present again remaining data.
- * If `output->pos < output->size`, decoder has flushed everything it could.
- * Returns 0 iff a frame is completely decoded and fully flushed.
- * Otherwise it returns a suggested next input size that will never load more
- * than the current frame.
- ******************************************************************************/
+typedef ZSTD_DStream zstd_dstream;
/**
- * ZSTD_DStreamWorkspaceBound() - memory needed to initialize a ZSTD_DStream
- * @maxWindowSize: The maximum window size allowed for compressed frames.
+ * zstd_dstream_workspace_bound() - memory needed to initialize a zstd_dstream
+ * @max_window_size: The maximum window size allowed for compressed frames.
*
- * Return: A lower bound on the size of the workspace that is passed to
- * ZSTD_initDStream() and ZSTD_initDStream_usingDDict().
+ * Return: A lower bound on the size of the workspace that is passed
+ * to zstd_init_dstream().
*/
-size_t ZSTD_DStreamWorkspaceBound(size_t maxWindowSize);
+size_t zstd_dstream_workspace_bound(size_t max_window_size);
/**
- * struct ZSTD_DStream - the zstd streaming decompression context
- */
-typedef struct ZSTD_DStream_s ZSTD_DStream;
-/*===== ZSTD_DStream management functions =====*/
-/**
- * ZSTD_initDStream() - initialize a zstd streaming decompression context
- * @maxWindowSize: The maximum window size allowed for compressed frames.
- * @workspace: The workspace to emplace the context into. It must outlive
- * the returned context.
- * @workspaceSize: The size of workspace.
- * Use ZSTD_DStreamWorkspaceBound(maxWindowSize) to determine
- * how large the workspace must be.
- *
- * Return: The zstd streaming decompression context.
- */
-ZSTD_DStream *ZSTD_initDStream(size_t maxWindowSize, void *workspace,
- size_t workspaceSize);
-/**
- * ZSTD_initDStream_usingDDict() - initialize streaming decompression context
- * @maxWindowSize: The maximum window size allowed for compressed frames.
- * @ddict: The digested dictionary to use for decompression.
- * @workspace: The workspace to emplace the context into. It must outlive
- * the returned context.
- * @workspaceSize: The size of workspace.
- * Use ZSTD_DStreamWorkspaceBound(maxWindowSize) to determine
- * how large the workspace must be.
+ * zstd_init_dstream() - initialize a zstd streaming decompression context
+ * @max_window_size: The maximum window size allowed for compressed frames.
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace.
+ * Use zstd_dstream_workspace_bound(max_window_size) to
+ * determine how large the workspace must be.
*
- * Return: The zstd streaming decompression context.
+ * Return: The zstd streaming decompression context.
*/
-ZSTD_DStream *ZSTD_initDStream_usingDDict(size_t maxWindowSize,
- const ZSTD_DDict *ddict, void *workspace, size_t workspaceSize);
+zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
+ size_t workspace_size);
-/*===== Streaming decompression functions =====*/
/**
- * ZSTD_resetDStream() - reset the context using parameters from creation
- * @zds: The zstd streaming decompression context to reset.
+ * zstd_reset_dstream() - reset the context using parameters from creation
+ * @dstream: The zstd streaming decompression context to reset.
*
* Resets the context using the parameters from creation. Skips dictionary
* loading, since it can be reused.
*
- * Return: Zero or an error, which can be checked using ZSTD_isError().
+ * Return: Zero or an error, which can be checked using zstd_is_error().
*/
-size_t ZSTD_resetDStream(ZSTD_DStream *zds);
+size_t zstd_reset_dstream(zstd_dstream *dstream);
+
/**
- * ZSTD_decompressStream() - streaming decompress some of input into output
- * @zds: The zstd streaming decompression context.
- * @output: Destination buffer. `output.pos` is updated to indicate how much
- * decompressed data was written.
- * @input: Source buffer. `input.pos` is updated to indicate how much data was
- * read. Note that it may not consume the entire input, in which case
- * `input.pos < input.size`, and it's up to the caller to present
- * remaining data again.
+ * zstd_decompress_stream() - streaming decompress some of input into output
+ * @dstream: The zstd streaming decompression context.
+ * @output: Destination buffer. `output.pos` is updated to indicate how much
+ * decompressed data was written.
+ * @input: Source buffer. `input.pos` is updated to indicate how much data was
+ * read. Note that it may not consume the entire input, in which case
+ * `input.pos < input.size`, and it's up to the caller to present
+ * remaining data again.
*
* The `input` and `output` buffers may be any size. Guaranteed to make some
* forward progress if `input` and `output` are not empty.
- * ZSTD_decompressStream() will not consume the last byte of the frame until
+ * zstd_decompress_stream() will not consume the last byte of the frame until
* the entire frame is flushed.
*
- * Return: Returns 0 iff a frame is completely decoded and fully flushed.
- * Otherwise returns a hint for the number of bytes to use as the input
- * for the next function call or an error, which can be checked using
- * ZSTD_isError(). The size hint will never load more than the frame.
- */
-size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output,
- ZSTD_inBuffer *input);
-
-/**
- * ZSTD_DStreamInSize() - recommended size for the input buffer
- *
- * Return: The recommended size for the input buffer.
- */
-size_t ZSTD_DStreamInSize(void);
-/**
- * ZSTD_DStreamOutSize() - recommended size for the output buffer
- *
- * When the output buffer is at least this large, it is guaranteed to be large
- * enough to flush at least one complete decompressed block.
- *
- * Return: The recommended size for the output buffer.
- */
-size_t ZSTD_DStreamOutSize(void);
-
-
-/* --- Constants ---*/
-#define ZSTD_MAGICNUMBER 0xFD2FB528 /* >= v0.8.0 */
-#define ZSTD_MAGIC_SKIPPABLE_START 0x184D2A50U
-
-#define ZSTD_CONTENTSIZE_UNKNOWN (0ULL - 1)
-#define ZSTD_CONTENTSIZE_ERROR (0ULL - 2)
-
-#define ZSTD_WINDOWLOG_MAX_32 27
-#define ZSTD_WINDOWLOG_MAX_64 27
-#define ZSTD_WINDOWLOG_MAX \
- ((unsigned int)(sizeof(size_t) == 4 \
- ? ZSTD_WINDOWLOG_MAX_32 \
- : ZSTD_WINDOWLOG_MAX_64))
-#define ZSTD_WINDOWLOG_MIN 10
-#define ZSTD_HASHLOG_MAX ZSTD_WINDOWLOG_MAX
-#define ZSTD_HASHLOG_MIN 6
-#define ZSTD_CHAINLOG_MAX (ZSTD_WINDOWLOG_MAX+1)
-#define ZSTD_CHAINLOG_MIN ZSTD_HASHLOG_MIN
-#define ZSTD_HASHLOG3_MAX 17
-#define ZSTD_SEARCHLOG_MAX (ZSTD_WINDOWLOG_MAX-1)
-#define ZSTD_SEARCHLOG_MIN 1
-/* only for ZSTD_fast, other strategies are limited to 6 */
-#define ZSTD_SEARCHLENGTH_MAX 7
-/* only for ZSTD_btopt, other strategies are limited to 4 */
-#define ZSTD_SEARCHLENGTH_MIN 3
-#define ZSTD_TARGETLENGTH_MIN 4
-#define ZSTD_TARGETLENGTH_MAX 999
-
-/* for static allocation */
-#define ZSTD_FRAMEHEADERSIZE_MAX 18
-#define ZSTD_FRAMEHEADERSIZE_MIN 6
-#define ZSTD_frameHeaderSize_prefix 5
-#define ZSTD_frameHeaderSize_min ZSTD_FRAMEHEADERSIZE_MIN
-#define ZSTD_frameHeaderSize_max ZSTD_FRAMEHEADERSIZE_MAX
-/* magic number + skippable frame length */
-#define ZSTD_skippableHeaderSize 8
-
-
-/*-*************************************
- * Compressed size functions
- **************************************/
-
-/**
- * ZSTD_findFrameCompressedSize() - returns the size of a compressed frame
- * @src: Source buffer. It should point to the start of a zstd encoded frame
- * or a skippable frame.
- * @srcSize: The size of the source buffer. It must be at least as large as the
- * size of the frame.
- *
- * Return: The compressed size of the frame pointed to by `src` or an error,
- * which can be check with ZSTD_isError().
- * Suitable to pass to ZSTD_decompress() or similar functions.
- */
-size_t ZSTD_findFrameCompressedSize(const void *src, size_t srcSize);
-
-/*-*************************************
- * Decompressed size functions
- **************************************/
-/**
- * ZSTD_getFrameContentSize() - returns the content size in a zstd frame header
- * @src: It should point to the start of a zstd encoded frame.
- * @srcSize: The size of the source buffer. It must be at least as large as the
- * frame header. `ZSTD_frameHeaderSize_max` is always large enough.
- *
- * Return: The frame content size stored in the frame header if known.
- * `ZSTD_CONTENTSIZE_UNKNOWN` if the content size isn't stored in the
- * frame header. `ZSTD_CONTENTSIZE_ERROR` on invalid input.
- */
-unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize);
-
-/**
- * ZSTD_findDecompressedSize() - returns decompressed size of a series of frames
- * @src: It should point to the start of a series of zstd encoded and/or
- * skippable frames.
- * @srcSize: The exact size of the series of frames.
- *
- * If any zstd encoded frame in the series doesn't have the frame content size
- * set, `ZSTD_CONTENTSIZE_UNKNOWN` is returned. But frame content size is always
- * set when using ZSTD_compress(). The decompressed size can be very large.
- * If the source is untrusted, the decompressed size could be wrong or
- * intentionally modified. Always ensure the result fits within the
- * application's authorized limits. ZSTD_findDecompressedSize() handles multiple
- * frames, and so it must traverse the input to read each frame header. This is
- * efficient as most of the data is skipped, however it does mean that all frame
- * data must be present and valid.
- *
- * Return: Decompressed size of all the data contained in the frames if known.
- * `ZSTD_CONTENTSIZE_UNKNOWN` if the decompressed size is unknown.
- * `ZSTD_CONTENTSIZE_ERROR` if an error occurred.
- */
-unsigned long long ZSTD_findDecompressedSize(const void *src, size_t srcSize);
-
-/*-*************************************
- * Advanced compression functions
- **************************************/
-/**
- * ZSTD_checkCParams() - ensure parameter values remain within authorized range
- * @cParams: The zstd compression parameters.
- *
- * Return: Zero or an error, which can be checked using ZSTD_isError().
- */
-size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams);
-
-/**
- * ZSTD_adjustCParams() - optimize parameters for a given srcSize and dictSize
- * @srcSize: Optionally the estimated source size, or zero if unknown.
- * @dictSize: Optionally the estimated dictionary size, or zero if unknown.
- *
- * Return: The optimized parameters.
- */
-ZSTD_compressionParameters ZSTD_adjustCParams(
- ZSTD_compressionParameters cParams, unsigned long long srcSize,
- size_t dictSize);
-
-/*--- Advanced decompression functions ---*/
-
-/**
- * ZSTD_isFrame() - returns true iff the buffer starts with a valid frame
- * @buffer: The source buffer to check.
- * @size: The size of the source buffer, must be at least 4 bytes.
- *
- * Return: True iff the buffer starts with a zstd or skippable frame identifier.
- */
-unsigned int ZSTD_isFrame(const void *buffer, size_t size);
-
-/**
- * ZSTD_getDictID_fromDict() - returns the dictionary id stored in a dictionary
- * @dict: The dictionary buffer.
- * @dictSize: The size of the dictionary buffer.
- *
- * Return: The dictionary id stored within the dictionary or 0 if the
- * dictionary is not a zstd dictionary. If it returns 0 the
- * dictionary can still be loaded as a content-only dictionary.
+ * Return: Returns 0 iff a frame is completely decoded and fully flushed.
+ * Otherwise returns a hint for the number of bytes to use as the
+ * input for the next function call or an error, which can be checked
+ * using zstd_is_error(). The size hint will never load more than the
+ * frame.
*/
-unsigned int ZSTD_getDictID_fromDict(const void *dict, size_t dictSize);
+size_t zstd_decompress_stream(zstd_dstream *dstream, zstd_out_buffer *output,
+ zstd_in_buffer *input);
-/**
- * ZSTD_getDictID_fromDDict() - returns the dictionary id stored in a ZSTD_DDict
- * @ddict: The ddict to find the id of.
- *
- * Return: The dictionary id stored within `ddict` or 0 if the dictionary is not
- * a zstd dictionary. If it returns 0 `ddict` will be loaded as a
- * content-only dictionary.
- */
-unsigned int ZSTD_getDictID_fromDDict(const ZSTD_DDict *ddict);
+/* ====== Frame Inspection Functions ====== */
/**
- * ZSTD_getDictID_fromFrame() - returns the dictionary id stored in a zstd frame
- * @src: Source buffer. It must be a zstd encoded frame.
- * @srcSize: The size of the source buffer. It must be at least as large as the
- * frame header. `ZSTD_frameHeaderSize_max` is always large enough.
+ * zstd_find_frame_compressed_size() - returns the size of a compressed frame
+ * @src: Source buffer. It should point to the start of a zstd encoded
+ * frame or a skippable frame.
+ * @src_size: The size of the source buffer. It must be at least as large as the
+ * size of the frame.
*
- * Return: The dictionary id required to decompress the frame stored within
- * `src` or 0 if the dictionary id could not be decoded. It can return
- * 0 if the frame does not require a dictionary, the dictionary id
- * wasn't stored in the frame, `src` is not a zstd frame, or `srcSize`
- * is too small.
+ * Return: The compressed size of the frame pointed to by `src` or an error,
+ * which can be check with zstd_is_error().
+ * Suitable to pass to ZSTD_decompress() or similar functions.
*/
-unsigned int ZSTD_getDictID_fromFrame(const void *src, size_t srcSize);
+size_t zstd_find_frame_compressed_size(const void *src, size_t src_size);
/**
- * struct ZSTD_frameParams - zstd frame parameters stored in the frame header
+ * struct zstd_frame_params - zstd frame parameters stored in the frame header
* @frameContentSize: The frame content size, or 0 if not present.
* @windowSize: The window size, or 0 if the frame is a skippable frame.
* @dictID: The dictionary id, or 0 if not present.
* @checksumFlag: Whether a checksum was used.
*/
-typedef struct {
- unsigned long long frameContentSize;
- unsigned int windowSize;
- unsigned int dictID;
- unsigned int checksumFlag;
-} ZSTD_frameParams;
+typedef ZSTD_frameParams zstd_frame_header;
/**
- * ZSTD_getFrameParams() - extracts parameters from a zstd or skippable frame
- * @fparamsPtr: On success the frame parameters are written here.
- * @src: The source buffer. It must point to a zstd or skippable frame.
- * @srcSize: The size of the source buffer. `ZSTD_frameHeaderSize_max` is
- * always large enough to succeed.
+ * zstd_get_frame_header() - extracts parameters from a zstd or skippable frame
+ * @params: On success the frame parameters are written here.
+ * @src: The source buffer. It must point to a zstd or skippable frame.
+ * @src_size: The size of the source buffer.
*
- * Return: 0 on success. If more data is required it returns how many bytes
- * must be provided to make forward progress. Otherwise it returns
- * an error, which can be checked using ZSTD_isError().
+ * Return: 0 on success. If more data is required it returns how many bytes
+ * must be provided to make forward progress. Otherwise it returns
+ * an error, which can be checked using zstd_is_error().
*/
-size_t ZSTD_getFrameParams(ZSTD_frameParams *fparamsPtr, const void *src,
- size_t srcSize);
-
-/*-*****************************************************************************
- * Buffer-less and synchronous inner streaming functions
- *
- * This is an advanced API, giving full control over buffer management, for
- * users which need direct control over memory.
- * But it's also a complex one, with many restrictions (documented below).
- * Prefer using normal streaming API for an easier experience
- ******************************************************************************/
-
-/*-*****************************************************************************
- * Buffer-less streaming compression (synchronous mode)
- *
- * A ZSTD_CCtx object is required to track streaming operations.
- * Use ZSTD_initCCtx() to initialize a context.
- * ZSTD_CCtx object can be re-used multiple times within successive compression
- * operations.
- *
- * Start by initializing a context.
- * Use ZSTD_compressBegin(), or ZSTD_compressBegin_usingDict() for dictionary
- * compression,
- * or ZSTD_compressBegin_advanced(), for finer parameter control.
- * It's also possible to duplicate a reference context which has already been
- * initialized, using ZSTD_copyCCtx()
- *
- * Then, consume your input using ZSTD_compressContinue().
- * There are some important considerations to keep in mind when using this
- * advanced function :
- * - ZSTD_compressContinue() has no internal buffer. It uses externally provided
- * buffer only.
- * - Interface is synchronous : input is consumed entirely and produce 1+
- * (or more) compressed blocks.
- * - Caller must ensure there is enough space in `dst` to store compressed data
- * under worst case scenario. Worst case evaluation is provided by
- * ZSTD_compressBound().
- * ZSTD_compressContinue() doesn't guarantee recover after a failed
- * compression.
- * - ZSTD_compressContinue() presumes prior input ***is still accessible and
- * unmodified*** (up to maximum distance size, see WindowLog).
- * It remembers all previous contiguous blocks, plus one separated memory
- * segment (which can itself consists of multiple contiguous blocks)
- * - ZSTD_compressContinue() detects that prior input has been overwritten when
- * `src` buffer overlaps. In which case, it will "discard" the relevant memory
- * section from its history.
- *
- * Finish a frame with ZSTD_compressEnd(), which will write the last block(s)
- * and optional checksum. It's possible to use srcSize==0, in which case, it
- * will write a final empty block to end the frame. Without last block mark,
- * frames will be considered unfinished (corrupted) by decoders.
- *
- * `ZSTD_CCtx` object can be re-used (ZSTD_compressBegin()) to compress some new
- * frame.
- ******************************************************************************/
-
-/*===== Buffer-less streaming compression functions =====*/
-size_t ZSTD_compressBegin(ZSTD_CCtx *cctx, int compressionLevel);
-size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx *cctx, const void *dict,
- size_t dictSize, int compressionLevel);
-size_t ZSTD_compressBegin_advanced(ZSTD_CCtx *cctx, const void *dict,
- size_t dictSize, ZSTD_parameters params,
- unsigned long long pledgedSrcSize);
-size_t ZSTD_copyCCtx(ZSTD_CCtx *cctx, const ZSTD_CCtx *preparedCCtx,
- unsigned long long pledgedSrcSize);
-size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx *cctx, const ZSTD_CDict *cdict,
- unsigned long long pledgedSrcSize);
-size_t ZSTD_compressContinue(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize);
-size_t ZSTD_compressEnd(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize);
-
-
-
-/*-*****************************************************************************
- * Buffer-less streaming decompression (synchronous mode)
- *
- * A ZSTD_DCtx object is required to track streaming operations.
- * Use ZSTD_initDCtx() to initialize a context.
- * A ZSTD_DCtx object can be re-used multiple times.
- *
- * First typical operation is to retrieve frame parameters, using
- * ZSTD_getFrameParams(). It fills a ZSTD_frameParams structure which provide
- * important information to correctly decode the frame, such as the minimum
- * rolling buffer size to allocate to decompress data (`windowSize`), and the
- * dictionary ID used.
- * Note: content size is optional, it may not be present. 0 means unknown.
- * Note that these values could be wrong, either because of data malformation,
- * or because an attacker is spoofing deliberate false information. As a
- * consequence, check that values remain within valid application range,
- * especially `windowSize`, before allocation. Each application can set its own
- * limit, depending on local restrictions. For extended interoperability, it is
- * recommended to support at least 8 MB.
- * Frame parameters are extracted from the beginning of the compressed frame.
- * Data fragment must be large enough to ensure successful decoding, typically
- * `ZSTD_frameHeaderSize_max` bytes.
- * Result: 0: successful decoding, the `ZSTD_frameParams` structure is filled.
- * >0: `srcSize` is too small, provide at least this many bytes.
- * errorCode, which can be tested using ZSTD_isError().
- *
- * Start decompression, with ZSTD_decompressBegin() or
- * ZSTD_decompressBegin_usingDict(). Alternatively, you can copy a prepared
- * context, using ZSTD_copyDCtx().
- *
- * Then use ZSTD_nextSrcSizeToDecompress() and ZSTD_decompressContinue()
- * alternatively.
- * ZSTD_nextSrcSizeToDecompress() tells how many bytes to provide as 'srcSize'
- * to ZSTD_decompressContinue().
- * ZSTD_decompressContinue() requires this _exact_ amount of bytes, or it will
- * fail.
- *
- * The result of ZSTD_decompressContinue() is the number of bytes regenerated
- * within 'dst' (necessarily <= dstCapacity). It can be zero, which is not an
- * error; it just means ZSTD_decompressContinue() has decoded some metadata
- * item. It can also be an error code, which can be tested with ZSTD_isError().
- *
- * ZSTD_decompressContinue() needs previous data blocks during decompression, up
- * to `windowSize`. They should preferably be located contiguously, prior to
- * current block. Alternatively, a round buffer of sufficient size is also
- * possible. Sufficient size is determined by frame parameters.
- * ZSTD_decompressContinue() is very sensitive to contiguity, if 2 blocks don't
- * follow each other, make sure that either the compressor breaks contiguity at
- * the same place, or that previous contiguous segment is large enough to
- * properly handle maximum back-reference.
- *
- * A frame is fully decoded when ZSTD_nextSrcSizeToDecompress() returns zero.
- * Context can then be reset to start a new decompression.
- *
- * Note: it's possible to know if next input to present is a header or a block,
- * using ZSTD_nextInputType(). This information is not required to properly
- * decode a frame.
- *
- * == Special case: skippable frames ==
- *
- * Skippable frames allow integration of user-defined data into a flow of
- * concatenated frames. Skippable frames will be ignored (skipped) by a
- * decompressor. The format of skippable frames is as follows:
- * a) Skippable frame ID - 4 Bytes, Little endian format, any value from
- * 0x184D2A50 to 0x184D2A5F
- * b) Frame Size - 4 Bytes, Little endian format, unsigned 32-bits
- * c) Frame Content - any content (User Data) of length equal to Frame Size
- * For skippable frames ZSTD_decompressContinue() always returns 0.
- * For skippable frames ZSTD_getFrameParams() returns fparamsPtr->windowLog==0
- * what means that a frame is skippable.
- * Note: If fparamsPtr->frameContentSize==0, it is ambiguous: the frame might
- * actually be a zstd encoded frame with no content. For purposes of
- * decompression, it is valid in both cases to skip the frame using
- * ZSTD_findFrameCompressedSize() to find its size in bytes.
- * It also returns frame size as fparamsPtr->frameContentSize.
- ******************************************************************************/
-
-/*===== Buffer-less streaming decompression functions =====*/
-size_t ZSTD_decompressBegin(ZSTD_DCtx *dctx);
-size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx *dctx, const void *dict,
- size_t dictSize);
-void ZSTD_copyDCtx(ZSTD_DCtx *dctx, const ZSTD_DCtx *preparedDCtx);
-size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx *dctx);
-size_t ZSTD_decompressContinue(ZSTD_DCtx *dctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize);
-typedef enum {
- ZSTDnit_frameHeader,
- ZSTDnit_blockHeader,
- ZSTDnit_block,
- ZSTDnit_lastBlock,
- ZSTDnit_checksum,
- ZSTDnit_skippableFrame
-} ZSTD_nextInputType_e;
-ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx *dctx);
-
-/*-*****************************************************************************
- * Block functions
- *
- * Block functions produce and decode raw zstd blocks, without frame metadata.
- * Frame metadata cost is typically ~18 bytes, which can be non-negligible for
- * very small blocks (< 100 bytes). User will have to take in charge required
- * information to regenerate data, such as compressed and content sizes.
- *
- * A few rules to respect:
- * - Compressing and decompressing require a context structure
- * + Use ZSTD_initCCtx() and ZSTD_initDCtx()
- * - It is necessary to init context before starting
- * + compression : ZSTD_compressBegin()
- * + decompression : ZSTD_decompressBegin()
- * + variants _usingDict() are also allowed
- * + copyCCtx() and copyDCtx() work too
- * - Block size is limited, it must be <= ZSTD_getBlockSizeMax()
- * + If you need to compress more, cut data into multiple blocks
- * + Consider using the regular ZSTD_compress() instead, as frame metadata
- * costs become negligible when source size is large.
- * - When a block is considered not compressible enough, ZSTD_compressBlock()
- * result will be zero. In which case, nothing is produced into `dst`.
- * + User must test for such outcome and deal directly with uncompressed data
- * + ZSTD_decompressBlock() doesn't accept uncompressed data as input!!!
- * + In case of multiple successive blocks, decoder must be informed of
- * uncompressed block existence to follow proper history. Use
- * ZSTD_insertBlock() in such a case.
- ******************************************************************************/
-
-/* Define for static allocation */
-#define ZSTD_BLOCKSIZE_ABSOLUTEMAX (128 * 1024)
-/*===== Raw zstd block functions =====*/
-size_t ZSTD_getBlockSizeMax(ZSTD_CCtx *cctx);
-size_t ZSTD_compressBlock(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize);
-size_t ZSTD_decompressBlock(ZSTD_DCtx *dctx, void *dst, size_t dstCapacity,
- const void *src, size_t srcSize);
-size_t ZSTD_insertBlock(ZSTD_DCtx *dctx, const void *blockStart,
- size_t blockSize);
+size_t zstd_get_frame_header(zstd_frame_header *params, const void *src,
+ size_t src_size);
-#endif /* ZSTD_H */
+#endif /* LINUX_ZSTD_H */
new file mode 100644
@@ -0,0 +1,1157 @@
+/*
+ * Copyright (c) Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of https://github.com/facebook/zstd.
+ * An additional grant of patent rights can be found in the PATENTS file in the
+ * same directory.
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation. This program is dual-licensed; you may select
+ * either version 2 of the GNU General Public License ("GPL") or BSD license
+ * ("BSD").
+ */
+
+#ifndef ZSTD_H
+#define ZSTD_H
+
+/* ====== Dependency ======*/
+#include <linux/types.h> /* size_t */
+
+
+/*-*****************************************************************************
+ * Introduction
+ *
+ * zstd, short for Zstandard, is a fast lossless compression algorithm,
+ * targeting real-time compression scenarios at zlib-level and better
+ * compression ratios. The zstd compression library provides in-memory
+ * compression and decompression functions. The library supports compression
+ * levels from 1 up to ZSTD_maxCLevel() which is 22. Levels >= 20, labeled
+ * ultra, should be used with caution, as they require more memory.
+ * Compression can be done in:
+ * - a single step, reusing a context (described as Explicit memory management)
+ * - unbounded multiple steps (described as Streaming compression)
+ * The compression ratio achievable on small data can be highly improved using
+ * compression with a dictionary in:
+ * - a single step (described as Simple dictionary API)
+ * - a single step, reusing a dictionary (described as Fast dictionary API)
+ ******************************************************************************/
+
+/*====== Helper functions ======*/
+
+/**
+ * enum ZSTD_ErrorCode - zstd error codes
+ *
+ * Functions that return size_t can be checked for errors using ZSTD_isError()
+ * and the ZSTD_ErrorCode can be extracted using ZSTD_getErrorCode().
+ */
+typedef enum {
+ ZSTD_error_no_error,
+ ZSTD_error_GENERIC,
+ ZSTD_error_prefix_unknown,
+ ZSTD_error_version_unsupported,
+ ZSTD_error_parameter_unknown,
+ ZSTD_error_frameParameter_unsupported,
+ ZSTD_error_frameParameter_unsupportedBy32bits,
+ ZSTD_error_frameParameter_windowTooLarge,
+ ZSTD_error_compressionParameter_unsupported,
+ ZSTD_error_init_missing,
+ ZSTD_error_memory_allocation,
+ ZSTD_error_stage_wrong,
+ ZSTD_error_dstSize_tooSmall,
+ ZSTD_error_srcSize_wrong,
+ ZSTD_error_corruption_detected,
+ ZSTD_error_checksum_wrong,
+ ZSTD_error_tableLog_tooLarge,
+ ZSTD_error_maxSymbolValue_tooLarge,
+ ZSTD_error_maxSymbolValue_tooSmall,
+ ZSTD_error_dictionary_corrupted,
+ ZSTD_error_dictionary_wrong,
+ ZSTD_error_dictionaryCreation_failed,
+ ZSTD_error_maxCode
+} ZSTD_ErrorCode;
+
+/**
+ * ZSTD_maxCLevel() - maximum compression level available
+ *
+ * Return: Maximum compression level available.
+ */
+int ZSTD_maxCLevel(void);
+/**
+ * ZSTD_compressBound() - maximum compressed size in worst case scenario
+ * @srcSize: The size of the data to compress.
+ *
+ * Return: The maximum compressed size in the worst case scenario.
+ */
+size_t ZSTD_compressBound(size_t srcSize);
+/**
+ * ZSTD_isError() - tells if a size_t function result is an error code
+ * @code: The function result to check for error.
+ *
+ * Return: Non-zero iff the code is an error.
+ */
+static __attribute__((unused)) unsigned int ZSTD_isError(size_t code)
+{
+ return code > (size_t)-ZSTD_error_maxCode;
+}
+/**
+ * ZSTD_getErrorCode() - translates an error function result to a ZSTD_ErrorCode
+ * @functionResult: The result of a function for which ZSTD_isError() is true.
+ *
+ * Return: The ZSTD_ErrorCode corresponding to the functionResult or 0
+ * if the functionResult isn't an error.
+ */
+static __attribute__((unused)) ZSTD_ErrorCode ZSTD_getErrorCode(
+ size_t functionResult)
+{
+ if (!ZSTD_isError(functionResult))
+ return (ZSTD_ErrorCode)0;
+ return (ZSTD_ErrorCode)(0 - functionResult);
+}
+
+/**
+ * enum ZSTD_strategy - zstd compression search strategy
+ *
+ * From faster to stronger.
+ */
+typedef enum {
+ ZSTD_fast,
+ ZSTD_dfast,
+ ZSTD_greedy,
+ ZSTD_lazy,
+ ZSTD_lazy2,
+ ZSTD_btlazy2,
+ ZSTD_btopt,
+ ZSTD_btopt2
+} ZSTD_strategy;
+
+/**
+ * struct ZSTD_compressionParameters - zstd compression parameters
+ * @windowLog: Log of the largest match distance. Larger means more
+ * compression, and more memory needed during decompression.
+ * @chainLog: Fully searched segment. Larger means more compression, slower,
+ * and more memory (useless for fast).
+ * @hashLog: Dispatch table. Larger means more compression,
+ * slower, and more memory.
+ * @searchLog: Number of searches. Larger means more compression and slower.
+ * @searchLength: Match length searched. Larger means faster decompression,
+ * sometimes less compression.
+ * @targetLength: Acceptable match size for optimal parser (only). Larger means
+ * more compression, and slower.
+ * @strategy: The zstd compression strategy.
+ */
+typedef struct {
+ unsigned int windowLog;
+ unsigned int chainLog;
+ unsigned int hashLog;
+ unsigned int searchLog;
+ unsigned int searchLength;
+ unsigned int targetLength;
+ ZSTD_strategy strategy;
+} ZSTD_compressionParameters;
+
+/**
+ * struct ZSTD_frameParameters - zstd frame parameters
+ * @contentSizeFlag: Controls whether content size will be present in the frame
+ * header (when known).
+ * @checksumFlag: Controls whether a 32-bit checksum is generated at the end
+ * of the frame for error detection.
+ * @noDictIDFlag: Controls whether dictID will be saved into the frame header
+ * when using dictionary compression.
+ *
+ * The default value is all fields set to 0.
+ */
+typedef struct {
+ unsigned int contentSizeFlag;
+ unsigned int checksumFlag;
+ unsigned int noDictIDFlag;
+} ZSTD_frameParameters;
+
+/**
+ * struct ZSTD_parameters - zstd parameters
+ * @cParams: The compression parameters.
+ * @fParams: The frame parameters.
+ */
+typedef struct {
+ ZSTD_compressionParameters cParams;
+ ZSTD_frameParameters fParams;
+} ZSTD_parameters;
+
+/**
+ * ZSTD_getCParams() - returns ZSTD_compressionParameters for selected level
+ * @compressionLevel: The compression level from 1 to ZSTD_maxCLevel().
+ * @estimatedSrcSize: The estimated source size to compress or 0 if unknown.
+ * @dictSize: The dictionary size or 0 if a dictionary isn't being used.
+ *
+ * Return: The selected ZSTD_compressionParameters.
+ */
+ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel,
+ unsigned long long estimatedSrcSize, size_t dictSize);
+
+/**
+ * ZSTD_getParams() - returns ZSTD_parameters for selected level
+ * @compressionLevel: The compression level from 1 to ZSTD_maxCLevel().
+ * @estimatedSrcSize: The estimated source size to compress or 0 if unknown.
+ * @dictSize: The dictionary size or 0 if a dictionary isn't being used.
+ *
+ * The same as ZSTD_getCParams() except also selects the default frame
+ * parameters (all zero).
+ *
+ * Return: The selected ZSTD_parameters.
+ */
+ZSTD_parameters ZSTD_getParams(int compressionLevel,
+ unsigned long long estimatedSrcSize, size_t dictSize);
+
+/*-*************************************
+ * Explicit memory management
+ **************************************/
+
+/**
+ * ZSTD_CCtxWorkspaceBound() - amount of memory needed to initialize a ZSTD_CCtx
+ * @cParams: The compression parameters to be used for compression.
+ *
+ * If multiple compression parameters might be used, the caller must call
+ * ZSTD_CCtxWorkspaceBound() for each set of parameters and use the maximum
+ * size.
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ * ZSTD_initCCtx().
+ */
+size_t ZSTD_CCtxWorkspaceBound(ZSTD_compressionParameters cParams);
+
+/**
+ * struct ZSTD_CCtx - the zstd compression context
+ *
+ * When compressing many times it is recommended to allocate a context just once
+ * and reuse it for each successive compression operation.
+ */
+typedef struct ZSTD_CCtx_s ZSTD_CCtx;
+/**
+ * ZSTD_initCCtx() - initialize a zstd compression context
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace. Use ZSTD_CCtxWorkspaceBound() to
+ * determine how large the workspace must be.
+ *
+ * Return: A compression context emplaced into workspace.
+ */
+ZSTD_CCtx *ZSTD_initCCtx(void *workspace, size_t workspaceSize);
+
+/**
+ * ZSTD_compressCCtx() - compress src into dst
+ * @ctx: The context. Must have been initialized with a workspace at
+ * least as large as ZSTD_CCtxWorkspaceBound(params.cParams).
+ * @dst: The buffer to compress src into.
+ * @dstCapacity: The size of the destination buffer. May be any size, but
+ * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
+ * @src: The data to compress.
+ * @srcSize: The size of the data to compress.
+ * @params: The parameters to use for compression. See ZSTD_getParams().
+ *
+ * Return: The compressed size or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_compressCCtx(ZSTD_CCtx *ctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize, ZSTD_parameters params);
+
+/**
+ * ZSTD_DCtxWorkspaceBound() - amount of memory needed to initialize a ZSTD_DCtx
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ * ZSTD_initDCtx().
+ */
+size_t ZSTD_DCtxWorkspaceBound(void);
+
+/**
+ * struct ZSTD_DCtx - the zstd decompression context
+ *
+ * When decompressing many times it is recommended to allocate a context just
+ * once and reuse it for each successive decompression operation.
+ */
+typedef struct ZSTD_DCtx_s ZSTD_DCtx;
+/**
+ * ZSTD_initDCtx() - initialize a zstd decompression context
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace. Use ZSTD_DCtxWorkspaceBound() to
+ * determine how large the workspace must be.
+ *
+ * Return: A decompression context emplaced into workspace.
+ */
+ZSTD_DCtx *ZSTD_initDCtx(void *workspace, size_t workspaceSize);
+
+/**
+ * ZSTD_decompressDCtx() - decompress zstd compressed src into dst
+ * @ctx: The decompression context.
+ * @dst: The buffer to decompress src into.
+ * @dstCapacity: The size of the destination buffer. Must be at least as large
+ * as the decompressed size. If the caller cannot upper bound the
+ * decompressed size, then it's better to use the streaming API.
+ * @src: The zstd compressed data to decompress. Multiple concatenated
+ * frames and skippable frames are allowed.
+ * @srcSize: The exact size of the data to decompress.
+ *
+ * Return: The decompressed size or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_decompressDCtx(ZSTD_DCtx *ctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize);
+
+/*-************************
+ * Simple dictionary API
+ **************************/
+
+/**
+ * ZSTD_compress_usingDict() - compress src into dst using a dictionary
+ * @ctx: The context. Must have been initialized with a workspace at
+ * least as large as ZSTD_CCtxWorkspaceBound(params.cParams).
+ * @dst: The buffer to compress src into.
+ * @dstCapacity: The size of the destination buffer. May be any size, but
+ * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
+ * @src: The data to compress.
+ * @srcSize: The size of the data to compress.
+ * @dict: The dictionary to use for compression.
+ * @dictSize: The size of the dictionary.
+ * @params: The parameters to use for compression. See ZSTD_getParams().
+ *
+ * Compression using a predefined dictionary. The same dictionary must be used
+ * during decompression.
+ *
+ * Return: The compressed size or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_compress_usingDict(ZSTD_CCtx *ctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize, const void *dict, size_t dictSize,
+ ZSTD_parameters params);
+
+/**
+ * ZSTD_decompress_usingDict() - decompress src into dst using a dictionary
+ * @ctx: The decompression context.
+ * @dst: The buffer to decompress src into.
+ * @dstCapacity: The size of the destination buffer. Must be at least as large
+ * as the decompressed size. If the caller cannot upper bound the
+ * decompressed size, then it's better to use the streaming API.
+ * @src: The zstd compressed data to decompress. Multiple concatenated
+ * frames and skippable frames are allowed.
+ * @srcSize: The exact size of the data to decompress.
+ * @dict: The dictionary to use for decompression. The same dictionary
+ * must've been used to compress the data.
+ * @dictSize: The size of the dictionary.
+ *
+ * Return: The decompressed size or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_decompress_usingDict(ZSTD_DCtx *ctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize, const void *dict, size_t dictSize);
+
+/*-**************************
+ * Fast dictionary API
+ ***************************/
+
+/**
+ * ZSTD_CDictWorkspaceBound() - memory needed to initialize a ZSTD_CDict
+ * @cParams: The compression parameters to be used for compression.
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ * ZSTD_initCDict().
+ */
+size_t ZSTD_CDictWorkspaceBound(ZSTD_compressionParameters cParams);
+
+/**
+ * struct ZSTD_CDict - a digested dictionary to be used for compression
+ */
+typedef struct ZSTD_CDict_s ZSTD_CDict;
+
+/**
+ * ZSTD_initCDict() - initialize a digested dictionary for compression
+ * @dictBuffer: The dictionary to digest. The buffer is referenced by the
+ * ZSTD_CDict so it must outlive the returned ZSTD_CDict.
+ * @dictSize: The size of the dictionary.
+ * @params: The parameters to use for compression. See ZSTD_getParams().
+ * @workspace: The workspace. It must outlive the returned ZSTD_CDict.
+ * @workspaceSize: The workspace size. Must be at least
+ * ZSTD_CDictWorkspaceBound(params.cParams).
+ *
+ * When compressing multiple messages / blocks with the same dictionary it is
+ * recommended to load it just once. The ZSTD_CDict merely references the
+ * dictBuffer, so it must outlive the returned ZSTD_CDict.
+ *
+ * Return: The digested dictionary emplaced into workspace.
+ */
+ZSTD_CDict *ZSTD_initCDict(const void *dictBuffer, size_t dictSize,
+ ZSTD_parameters params, void *workspace, size_t workspaceSize);
+
+/**
+ * ZSTD_compress_usingCDict() - compress src into dst using a ZSTD_CDict
+ * @ctx: The context. Must have been initialized with a workspace at
+ * least as large as ZSTD_CCtxWorkspaceBound(cParams) where
+ * cParams are the compression parameters used to initialize the
+ * cdict.
+ * @dst: The buffer to compress src into.
+ * @dstCapacity: The size of the destination buffer. May be any size, but
+ * ZSTD_compressBound(srcSize) is guaranteed to be large enough.
+ * @src: The data to compress.
+ * @srcSize: The size of the data to compress.
+ * @cdict: The digested dictionary to use for compression.
+ * @params: The parameters to use for compression. See ZSTD_getParams().
+ *
+ * Compression using a digested dictionary. The same dictionary must be used
+ * during decompression.
+ *
+ * Return: The compressed size or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_compress_usingCDict(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize, const ZSTD_CDict *cdict);
+
+
+/**
+ * ZSTD_DDictWorkspaceBound() - memory needed to initialize a ZSTD_DDict
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ * ZSTD_initDDict().
+ */
+size_t ZSTD_DDictWorkspaceBound(void);
+
+/**
+ * struct ZSTD_DDict - a digested dictionary to be used for decompression
+ */
+typedef struct ZSTD_DDict_s ZSTD_DDict;
+
+/**
+ * ZSTD_initDDict() - initialize a digested dictionary for decompression
+ * @dictBuffer: The dictionary to digest. The buffer is referenced by the
+ * ZSTD_DDict so it must outlive the returned ZSTD_DDict.
+ * @dictSize: The size of the dictionary.
+ * @workspace: The workspace. It must outlive the returned ZSTD_DDict.
+ * @workspaceSize: The workspace size. Must be at least
+ * ZSTD_DDictWorkspaceBound().
+ *
+ * When decompressing multiple messages / blocks with the same dictionary it is
+ * recommended to load it just once. The ZSTD_DDict merely references the
+ * dictBuffer, so it must outlive the returned ZSTD_DDict.
+ *
+ * Return: The digested dictionary emplaced into workspace.
+ */
+ZSTD_DDict *ZSTD_initDDict(const void *dictBuffer, size_t dictSize,
+ void *workspace, size_t workspaceSize);
+
+/**
+ * ZSTD_decompress_usingDDict() - decompress src into dst using a ZSTD_DDict
+ * @ctx: The decompression context.
+ * @dst: The buffer to decompress src into.
+ * @dstCapacity: The size of the destination buffer. Must be at least as large
+ * as the decompressed size. If the caller cannot upper bound the
+ * decompressed size, then it's better to use the streaming API.
+ * @src: The zstd compressed data to decompress. Multiple concatenated
+ * frames and skippable frames are allowed.
+ * @srcSize: The exact size of the data to decompress.
+ * @ddict: The digested dictionary to use for decompression. The same
+ * dictionary must've been used to compress the data.
+ *
+ * Return: The decompressed size or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_decompress_usingDDict(ZSTD_DCtx *dctx, void *dst,
+ size_t dstCapacity, const void *src, size_t srcSize,
+ const ZSTD_DDict *ddict);
+
+
+/*-**************************
+ * Streaming
+ ***************************/
+
+/**
+ * struct ZSTD_inBuffer - input buffer for streaming
+ * @src: Start of the input buffer.
+ * @size: Size of the input buffer.
+ * @pos: Position where reading stopped. Will be updated.
+ * Necessarily 0 <= pos <= size.
+ */
+typedef struct ZSTD_inBuffer_s {
+ const void *src;
+ size_t size;
+ size_t pos;
+} ZSTD_inBuffer;
+
+/**
+ * struct ZSTD_outBuffer - output buffer for streaming
+ * @dst: Start of the output buffer.
+ * @size: Size of the output buffer.
+ * @pos: Position where writing stopped. Will be updated.
+ * Necessarily 0 <= pos <= size.
+ */
+typedef struct ZSTD_outBuffer_s {
+ void *dst;
+ size_t size;
+ size_t pos;
+} ZSTD_outBuffer;
+
+
+
+/*-*****************************************************************************
+ * Streaming compression - HowTo
+ *
+ * A ZSTD_CStream object is required to track streaming operation.
+ * Use ZSTD_initCStream() to initialize a ZSTD_CStream object.
+ * ZSTD_CStream objects can be reused multiple times on consecutive compression
+ * operations. It is recommended to re-use ZSTD_CStream in situations where many
+ * streaming operations will be achieved consecutively. Use one separate
+ * ZSTD_CStream per thread for parallel execution.
+ *
+ * Use ZSTD_compressStream() repetitively to consume input stream.
+ * The function will automatically update both `pos` fields.
+ * Note that it may not consume the entire input, in which case `pos < size`,
+ * and it's up to the caller to present again remaining data.
+ * It returns a hint for the preferred number of bytes to use as an input for
+ * the next function call.
+ *
+ * At any moment, it's possible to flush whatever data remains within internal
+ * buffer, using ZSTD_flushStream(). `output->pos` will be updated. There might
+ * still be some content left within the internal buffer if `output->size` is
+ * too small. It returns the number of bytes left in the internal buffer and
+ * must be called until it returns 0.
+ *
+ * ZSTD_endStream() instructs to finish a frame. It will perform a flush and
+ * write frame epilogue. The epilogue is required for decoders to consider a
+ * frame completed. Similar to ZSTD_flushStream(), it may not be able to flush
+ * the full content if `output->size` is too small. In which case, call again
+ * ZSTD_endStream() to complete the flush. It returns the number of bytes left
+ * in the internal buffer and must be called until it returns 0.
+ ******************************************************************************/
+
+/**
+ * ZSTD_CStreamWorkspaceBound() - memory needed to initialize a ZSTD_CStream
+ * @cParams: The compression parameters to be used for compression.
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ * ZSTD_initCStream() and ZSTD_initCStream_usingCDict().
+ */
+size_t ZSTD_CStreamWorkspaceBound(ZSTD_compressionParameters cParams);
+
+/**
+ * struct ZSTD_CStream - the zstd streaming compression context
+ */
+typedef struct ZSTD_CStream_s ZSTD_CStream;
+
+/*===== ZSTD_CStream management functions =====*/
+/**
+ * ZSTD_initCStream() - initialize a zstd streaming compression context
+ * @params: The zstd compression parameters.
+ * @pledgedSrcSize: If params.fParams.contentSizeFlag == 1 then the caller must
+ * pass the source size (zero means empty source). Otherwise,
+ * the caller may optionally pass the source size, or zero if
+ * unknown.
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace.
+ * Use ZSTD_CStreamWorkspaceBound(params.cParams) to determine
+ * how large the workspace must be.
+ *
+ * Return: The zstd streaming compression context.
+ */
+ZSTD_CStream *ZSTD_initCStream(ZSTD_parameters params,
+ unsigned long long pledgedSrcSize, void *workspace,
+ size_t workspaceSize);
+
+/**
+ * ZSTD_initCStream_usingCDict() - initialize a streaming compression context
+ * @cdict: The digested dictionary to use for compression.
+ * @pledgedSrcSize: Optionally the source size, or zero if unknown.
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace. Call ZSTD_CStreamWorkspaceBound()
+ * with the cParams used to initialize the cdict to determine
+ * how large the workspace must be.
+ *
+ * Return: The zstd streaming compression context.
+ */
+ZSTD_CStream *ZSTD_initCStream_usingCDict(const ZSTD_CDict *cdict,
+ unsigned long long pledgedSrcSize, void *workspace,
+ size_t workspaceSize);
+
+/*===== Streaming compression functions =====*/
+/**
+ * ZSTD_resetCStream() - reset the context using parameters from creation
+ * @zcs: The zstd streaming compression context to reset.
+ * @pledgedSrcSize: Optionally the source size, or zero if unknown.
+ *
+ * Resets the context using the parameters from creation. Skips dictionary
+ * loading, since it can be reused. If `pledgedSrcSize` is non-zero the frame
+ * content size is always written into the frame header.
+ *
+ * Return: Zero or an error, which can be checked using ZSTD_isError().
+ */
+size_t ZSTD_resetCStream(ZSTD_CStream *zcs, unsigned long long pledgedSrcSize);
+/**
+ * ZSTD_compressStream() - streaming compress some of input into output
+ * @zcs: The zstd streaming compression context.
+ * @output: Destination buffer. `output->pos` is updated to indicate how much
+ * compressed data was written.
+ * @input: Source buffer. `input->pos` is updated to indicate how much data was
+ * read. Note that it may not consume the entire input, in which case
+ * `input->pos < input->size`, and it's up to the caller to present
+ * remaining data again.
+ *
+ * The `input` and `output` buffers may be any size. Guaranteed to make some
+ * forward progress if `input` and `output` are not empty.
+ *
+ * Return: A hint for the number of bytes to use as the input for the next
+ * function call or an error, which can be checked using
+ * ZSTD_isError().
+ */
+size_t ZSTD_compressStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output,
+ ZSTD_inBuffer *input);
+/**
+ * ZSTD_flushStream() - flush internal buffers into output
+ * @zcs: The zstd streaming compression context.
+ * @output: Destination buffer. `output->pos` is updated to indicate how much
+ * compressed data was written.
+ *
+ * ZSTD_flushStream() must be called until it returns 0, meaning all the data
+ * has been flushed. Since ZSTD_flushStream() causes a block to be ended,
+ * calling it too often will degrade the compression ratio.
+ *
+ * Return: The number of bytes still present within internal buffers or an
+ * error, which can be checked using ZSTD_isError().
+ */
+size_t ZSTD_flushStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output);
+/**
+ * ZSTD_endStream() - flush internal buffers into output and end the frame
+ * @zcs: The zstd streaming compression context.
+ * @output: Destination buffer. `output->pos` is updated to indicate how much
+ * compressed data was written.
+ *
+ * ZSTD_endStream() must be called until it returns 0, meaning all the data has
+ * been flushed and the frame epilogue has been written.
+ *
+ * Return: The number of bytes still present within internal buffers or an
+ * error, which can be checked using ZSTD_isError().
+ */
+size_t ZSTD_endStream(ZSTD_CStream *zcs, ZSTD_outBuffer *output);
+
+/**
+ * ZSTD_CStreamInSize() - recommended size for the input buffer
+ *
+ * Return: The recommended size for the input buffer.
+ */
+size_t ZSTD_CStreamInSize(void);
+/**
+ * ZSTD_CStreamOutSize() - recommended size for the output buffer
+ *
+ * When the output buffer is at least this large, it is guaranteed to be large
+ * enough to flush at least one complete compressed block.
+ *
+ * Return: The recommended size for the output buffer.
+ */
+size_t ZSTD_CStreamOutSize(void);
+
+
+
+/*-*****************************************************************************
+ * Streaming decompression - HowTo
+ *
+ * A ZSTD_DStream object is required to track streaming operations.
+ * Use ZSTD_initDStream() to initialize a ZSTD_DStream object.
+ * ZSTD_DStream objects can be re-used multiple times.
+ *
+ * Use ZSTD_decompressStream() repetitively to consume your input.
+ * The function will update both `pos` fields.
+ * If `input->pos < input->size`, some input has not been consumed.
+ * It's up to the caller to present again remaining data.
+ * If `output->pos < output->size`, decoder has flushed everything it could.
+ * Returns 0 iff a frame is completely decoded and fully flushed.
+ * Otherwise it returns a suggested next input size that will never load more
+ * than the current frame.
+ ******************************************************************************/
+
+/**
+ * ZSTD_DStreamWorkspaceBound() - memory needed to initialize a ZSTD_DStream
+ * @maxWindowSize: The maximum window size allowed for compressed frames.
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ * ZSTD_initDStream() and ZSTD_initDStream_usingDDict().
+ */
+size_t ZSTD_DStreamWorkspaceBound(size_t maxWindowSize);
+
+/**
+ * struct ZSTD_DStream - the zstd streaming decompression context
+ */
+typedef struct ZSTD_DStream_s ZSTD_DStream;
+/*===== ZSTD_DStream management functions =====*/
+/**
+ * ZSTD_initDStream() - initialize a zstd streaming decompression context
+ * @maxWindowSize: The maximum window size allowed for compressed frames.
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace.
+ * Use ZSTD_DStreamWorkspaceBound(maxWindowSize) to determine
+ * how large the workspace must be.
+ *
+ * Return: The zstd streaming decompression context.
+ */
+ZSTD_DStream *ZSTD_initDStream(size_t maxWindowSize, void *workspace,
+ size_t workspaceSize);
+/**
+ * ZSTD_initDStream_usingDDict() - initialize streaming decompression context
+ * @maxWindowSize: The maximum window size allowed for compressed frames.
+ * @ddict: The digested dictionary to use for decompression.
+ * @workspace: The workspace to emplace the context into. It must outlive
+ * the returned context.
+ * @workspaceSize: The size of workspace.
+ * Use ZSTD_DStreamWorkspaceBound(maxWindowSize) to determine
+ * how large the workspace must be.
+ *
+ * Return: The zstd streaming decompression context.
+ */
+ZSTD_DStream *ZSTD_initDStream_usingDDict(size_t maxWindowSize,
+ const ZSTD_DDict *ddict, void *workspace, size_t workspaceSize);
+
+/*===== Streaming decompression functions =====*/
+/**
+ * ZSTD_resetDStream() - reset the context using parameters from creation
+ * @zds: The zstd streaming decompression context to reset.
+ *
+ * Resets the context using the parameters from creation. Skips dictionary
+ * loading, since it can be reused.
+ *
+ * Return: Zero or an error, which can be checked using ZSTD_isError().
+ */
+size_t ZSTD_resetDStream(ZSTD_DStream *zds);
+/**
+ * ZSTD_decompressStream() - streaming decompress some of input into output
+ * @zds: The zstd streaming decompression context.
+ * @output: Destination buffer. `output.pos` is updated to indicate how much
+ * decompressed data was written.
+ * @input: Source buffer. `input.pos` is updated to indicate how much data was
+ * read. Note that it may not consume the entire input, in which case
+ * `input.pos < input.size`, and it's up to the caller to present
+ * remaining data again.
+ *
+ * The `input` and `output` buffers may be any size. Guaranteed to make some
+ * forward progress if `input` and `output` are not empty.
+ * ZSTD_decompressStream() will not consume the last byte of the frame until
+ * the entire frame is flushed.
+ *
+ * Return: Returns 0 iff a frame is completely decoded and fully flushed.
+ * Otherwise returns a hint for the number of bytes to use as the input
+ * for the next function call or an error, which can be checked using
+ * ZSTD_isError(). The size hint will never load more than the frame.
+ */
+size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output,
+ ZSTD_inBuffer *input);
+
+/**
+ * ZSTD_DStreamInSize() - recommended size for the input buffer
+ *
+ * Return: The recommended size for the input buffer.
+ */
+size_t ZSTD_DStreamInSize(void);
+/**
+ * ZSTD_DStreamOutSize() - recommended size for the output buffer
+ *
+ * When the output buffer is at least this large, it is guaranteed to be large
+ * enough to flush at least one complete decompressed block.
+ *
+ * Return: The recommended size for the output buffer.
+ */
+size_t ZSTD_DStreamOutSize(void);
+
+
+/* --- Constants ---*/
+#define ZSTD_MAGICNUMBER 0xFD2FB528 /* >= v0.8.0 */
+#define ZSTD_MAGIC_SKIPPABLE_START 0x184D2A50U
+
+#define ZSTD_CONTENTSIZE_UNKNOWN (0ULL - 1)
+#define ZSTD_CONTENTSIZE_ERROR (0ULL - 2)
+
+#define ZSTD_WINDOWLOG_MAX_32 27
+#define ZSTD_WINDOWLOG_MAX_64 27
+#define ZSTD_WINDOWLOG_MAX \
+ ((unsigned int)(sizeof(size_t) == 4 \
+ ? ZSTD_WINDOWLOG_MAX_32 \
+ : ZSTD_WINDOWLOG_MAX_64))
+#define ZSTD_WINDOWLOG_MIN 10
+#define ZSTD_HASHLOG_MAX ZSTD_WINDOWLOG_MAX
+#define ZSTD_HASHLOG_MIN 6
+#define ZSTD_CHAINLOG_MAX (ZSTD_WINDOWLOG_MAX+1)
+#define ZSTD_CHAINLOG_MIN ZSTD_HASHLOG_MIN
+#define ZSTD_HASHLOG3_MAX 17
+#define ZSTD_SEARCHLOG_MAX (ZSTD_WINDOWLOG_MAX-1)
+#define ZSTD_SEARCHLOG_MIN 1
+/* only for ZSTD_fast, other strategies are limited to 6 */
+#define ZSTD_SEARCHLENGTH_MAX 7
+/* only for ZSTD_btopt, other strategies are limited to 4 */
+#define ZSTD_SEARCHLENGTH_MIN 3
+#define ZSTD_TARGETLENGTH_MIN 4
+#define ZSTD_TARGETLENGTH_MAX 999
+
+/* for static allocation */
+#define ZSTD_FRAMEHEADERSIZE_MAX 18
+#define ZSTD_FRAMEHEADERSIZE_MIN 6
+#define ZSTD_frameHeaderSize_prefix 5
+#define ZSTD_frameHeaderSize_min ZSTD_FRAMEHEADERSIZE_MIN
+#define ZSTD_frameHeaderSize_max ZSTD_FRAMEHEADERSIZE_MAX
+/* magic number + skippable frame length */
+#define ZSTD_skippableHeaderSize 8
+
+
+/*-*************************************
+ * Compressed size functions
+ **************************************/
+
+/**
+ * ZSTD_findFrameCompressedSize() - returns the size of a compressed frame
+ * @src: Source buffer. It should point to the start of a zstd encoded frame
+ * or a skippable frame.
+ * @srcSize: The size of the source buffer. It must be at least as large as the
+ * size of the frame.
+ *
+ * Return: The compressed size of the frame pointed to by `src` or an error,
+ * which can be check with ZSTD_isError().
+ * Suitable to pass to ZSTD_decompress() or similar functions.
+ */
+size_t ZSTD_findFrameCompressedSize(const void *src, size_t srcSize);
+
+/*-*************************************
+ * Decompressed size functions
+ **************************************/
+/**
+ * ZSTD_getFrameContentSize() - returns the content size in a zstd frame header
+ * @src: It should point to the start of a zstd encoded frame.
+ * @srcSize: The size of the source buffer. It must be at least as large as the
+ * frame header. `ZSTD_frameHeaderSize_max` is always large enough.
+ *
+ * Return: The frame content size stored in the frame header if known.
+ * `ZSTD_CONTENTSIZE_UNKNOWN` if the content size isn't stored in the
+ * frame header. `ZSTD_CONTENTSIZE_ERROR` on invalid input.
+ */
+unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize);
+
+/**
+ * ZSTD_findDecompressedSize() - returns decompressed size of a series of frames
+ * @src: It should point to the start of a series of zstd encoded and/or
+ * skippable frames.
+ * @srcSize: The exact size of the series of frames.
+ *
+ * If any zstd encoded frame in the series doesn't have the frame content size
+ * set, `ZSTD_CONTENTSIZE_UNKNOWN` is returned. But frame content size is always
+ * set when using ZSTD_compress(). The decompressed size can be very large.
+ * If the source is untrusted, the decompressed size could be wrong or
+ * intentionally modified. Always ensure the result fits within the
+ * application's authorized limits. ZSTD_findDecompressedSize() handles multiple
+ * frames, and so it must traverse the input to read each frame header. This is
+ * efficient as most of the data is skipped, however it does mean that all frame
+ * data must be present and valid.
+ *
+ * Return: Decompressed size of all the data contained in the frames if known.
+ * `ZSTD_CONTENTSIZE_UNKNOWN` if the decompressed size is unknown.
+ * `ZSTD_CONTENTSIZE_ERROR` if an error occurred.
+ */
+unsigned long long ZSTD_findDecompressedSize(const void *src, size_t srcSize);
+
+/*-*************************************
+ * Advanced compression functions
+ **************************************/
+/**
+ * ZSTD_checkCParams() - ensure parameter values remain within authorized range
+ * @cParams: The zstd compression parameters.
+ *
+ * Return: Zero or an error, which can be checked using ZSTD_isError().
+ */
+size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams);
+
+/**
+ * ZSTD_adjustCParams() - optimize parameters for a given srcSize and dictSize
+ * @srcSize: Optionally the estimated source size, or zero if unknown.
+ * @dictSize: Optionally the estimated dictionary size, or zero if unknown.
+ *
+ * Return: The optimized parameters.
+ */
+ZSTD_compressionParameters ZSTD_adjustCParams(
+ ZSTD_compressionParameters cParams, unsigned long long srcSize,
+ size_t dictSize);
+
+/*--- Advanced decompression functions ---*/
+
+/**
+ * ZSTD_isFrame() - returns true iff the buffer starts with a valid frame
+ * @buffer: The source buffer to check.
+ * @size: The size of the source buffer, must be at least 4 bytes.
+ *
+ * Return: True iff the buffer starts with a zstd or skippable frame identifier.
+ */
+unsigned int ZSTD_isFrame(const void *buffer, size_t size);
+
+/**
+ * ZSTD_getDictID_fromDict() - returns the dictionary id stored in a dictionary
+ * @dict: The dictionary buffer.
+ * @dictSize: The size of the dictionary buffer.
+ *
+ * Return: The dictionary id stored within the dictionary or 0 if the
+ * dictionary is not a zstd dictionary. If it returns 0 the
+ * dictionary can still be loaded as a content-only dictionary.
+ */
+unsigned int ZSTD_getDictID_fromDict(const void *dict, size_t dictSize);
+
+/**
+ * ZSTD_getDictID_fromDDict() - returns the dictionary id stored in a ZSTD_DDict
+ * @ddict: The ddict to find the id of.
+ *
+ * Return: The dictionary id stored within `ddict` or 0 if the dictionary is not
+ * a zstd dictionary. If it returns 0 `ddict` will be loaded as a
+ * content-only dictionary.
+ */
+unsigned int ZSTD_getDictID_fromDDict(const ZSTD_DDict *ddict);
+
+/**
+ * ZSTD_getDictID_fromFrame() - returns the dictionary id stored in a zstd frame
+ * @src: Source buffer. It must be a zstd encoded frame.
+ * @srcSize: The size of the source buffer. It must be at least as large as the
+ * frame header. `ZSTD_frameHeaderSize_max` is always large enough.
+ *
+ * Return: The dictionary id required to decompress the frame stored within
+ * `src` or 0 if the dictionary id could not be decoded. It can return
+ * 0 if the frame does not require a dictionary, the dictionary id
+ * wasn't stored in the frame, `src` is not a zstd frame, or `srcSize`
+ * is too small.
+ */
+unsigned int ZSTD_getDictID_fromFrame(const void *src, size_t srcSize);
+
+/**
+ * struct ZSTD_frameParams - zstd frame parameters stored in the frame header
+ * @frameContentSize: The frame content size, or 0 if not present.
+ * @windowSize: The window size, or 0 if the frame is a skippable frame.
+ * @dictID: The dictionary id, or 0 if not present.
+ * @checksumFlag: Whether a checksum was used.
+ */
+typedef struct {
+ unsigned long long frameContentSize;
+ unsigned int windowSize;
+ unsigned int dictID;
+ unsigned int checksumFlag;
+} ZSTD_frameParams;
+
+/**
+ * ZSTD_getFrameParams() - extracts parameters from a zstd or skippable frame
+ * @fparamsPtr: On success the frame parameters are written here.
+ * @src: The source buffer. It must point to a zstd or skippable frame.
+ * @srcSize: The size of the source buffer. `ZSTD_frameHeaderSize_max` is
+ * always large enough to succeed.
+ *
+ * Return: 0 on success. If more data is required it returns how many bytes
+ * must be provided to make forward progress. Otherwise it returns
+ * an error, which can be checked using ZSTD_isError().
+ */
+size_t ZSTD_getFrameParams(ZSTD_frameParams *fparamsPtr, const void *src,
+ size_t srcSize);
+
+/*-*****************************************************************************
+ * Buffer-less and synchronous inner streaming functions
+ *
+ * This is an advanced API, giving full control over buffer management, for
+ * users which need direct control over memory.
+ * But it's also a complex one, with many restrictions (documented below).
+ * Prefer using normal streaming API for an easier experience
+ ******************************************************************************/
+
+/*-*****************************************************************************
+ * Buffer-less streaming compression (synchronous mode)
+ *
+ * A ZSTD_CCtx object is required to track streaming operations.
+ * Use ZSTD_initCCtx() to initialize a context.
+ * ZSTD_CCtx object can be re-used multiple times within successive compression
+ * operations.
+ *
+ * Start by initializing a context.
+ * Use ZSTD_compressBegin(), or ZSTD_compressBegin_usingDict() for dictionary
+ * compression,
+ * or ZSTD_compressBegin_advanced(), for finer parameter control.
+ * It's also possible to duplicate a reference context which has already been
+ * initialized, using ZSTD_copyCCtx()
+ *
+ * Then, consume your input using ZSTD_compressContinue().
+ * There are some important considerations to keep in mind when using this
+ * advanced function :
+ * - ZSTD_compressContinue() has no internal buffer. It uses externally provided
+ * buffer only.
+ * - Interface is synchronous : input is consumed entirely and produce 1+
+ * (or more) compressed blocks.
+ * - Caller must ensure there is enough space in `dst` to store compressed data
+ * under worst case scenario. Worst case evaluation is provided by
+ * ZSTD_compressBound().
+ * ZSTD_compressContinue() doesn't guarantee recover after a failed
+ * compression.
+ * - ZSTD_compressContinue() presumes prior input ***is still accessible and
+ * unmodified*** (up to maximum distance size, see WindowLog).
+ * It remembers all previous contiguous blocks, plus one separated memory
+ * segment (which can itself consists of multiple contiguous blocks)
+ * - ZSTD_compressContinue() detects that prior input has been overwritten when
+ * `src` buffer overlaps. In which case, it will "discard" the relevant memory
+ * section from its history.
+ *
+ * Finish a frame with ZSTD_compressEnd(), which will write the last block(s)
+ * and optional checksum. It's possible to use srcSize==0, in which case, it
+ * will write a final empty block to end the frame. Without last block mark,
+ * frames will be considered unfinished (corrupted) by decoders.
+ *
+ * `ZSTD_CCtx` object can be re-used (ZSTD_compressBegin()) to compress some new
+ * frame.
+ ******************************************************************************/
+
+/*===== Buffer-less streaming compression functions =====*/
+size_t ZSTD_compressBegin(ZSTD_CCtx *cctx, int compressionLevel);
+size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx *cctx, const void *dict,
+ size_t dictSize, int compressionLevel);
+size_t ZSTD_compressBegin_advanced(ZSTD_CCtx *cctx, const void *dict,
+ size_t dictSize, ZSTD_parameters params,
+ unsigned long long pledgedSrcSize);
+size_t ZSTD_copyCCtx(ZSTD_CCtx *cctx, const ZSTD_CCtx *preparedCCtx,
+ unsigned long long pledgedSrcSize);
+size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx *cctx, const ZSTD_CDict *cdict,
+ unsigned long long pledgedSrcSize);
+size_t ZSTD_compressContinue(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize);
+size_t ZSTD_compressEnd(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize);
+
+
+
+/*-*****************************************************************************
+ * Buffer-less streaming decompression (synchronous mode)
+ *
+ * A ZSTD_DCtx object is required to track streaming operations.
+ * Use ZSTD_initDCtx() to initialize a context.
+ * A ZSTD_DCtx object can be re-used multiple times.
+ *
+ * First typical operation is to retrieve frame parameters, using
+ * ZSTD_getFrameParams(). It fills a ZSTD_frameParams structure which provide
+ * important information to correctly decode the frame, such as the minimum
+ * rolling buffer size to allocate to decompress data (`windowSize`), and the
+ * dictionary ID used.
+ * Note: content size is optional, it may not be present. 0 means unknown.
+ * Note that these values could be wrong, either because of data malformation,
+ * or because an attacker is spoofing deliberate false information. As a
+ * consequence, check that values remain within valid application range,
+ * especially `windowSize`, before allocation. Each application can set its own
+ * limit, depending on local restrictions. For extended interoperability, it is
+ * recommended to support at least 8 MB.
+ * Frame parameters are extracted from the beginning of the compressed frame.
+ * Data fragment must be large enough to ensure successful decoding, typically
+ * `ZSTD_frameHeaderSize_max` bytes.
+ * Result: 0: successful decoding, the `ZSTD_frameParams` structure is filled.
+ * >0: `srcSize` is too small, provide at least this many bytes.
+ * errorCode, which can be tested using ZSTD_isError().
+ *
+ * Start decompression, with ZSTD_decompressBegin() or
+ * ZSTD_decompressBegin_usingDict(). Alternatively, you can copy a prepared
+ * context, using ZSTD_copyDCtx().
+ *
+ * Then use ZSTD_nextSrcSizeToDecompress() and ZSTD_decompressContinue()
+ * alternatively.
+ * ZSTD_nextSrcSizeToDecompress() tells how many bytes to provide as 'srcSize'
+ * to ZSTD_decompressContinue().
+ * ZSTD_decompressContinue() requires this _exact_ amount of bytes, or it will
+ * fail.
+ *
+ * The result of ZSTD_decompressContinue() is the number of bytes regenerated
+ * within 'dst' (necessarily <= dstCapacity). It can be zero, which is not an
+ * error; it just means ZSTD_decompressContinue() has decoded some metadata
+ * item. It can also be an error code, which can be tested with ZSTD_isError().
+ *
+ * ZSTD_decompressContinue() needs previous data blocks during decompression, up
+ * to `windowSize`. They should preferably be located contiguously, prior to
+ * current block. Alternatively, a round buffer of sufficient size is also
+ * possible. Sufficient size is determined by frame parameters.
+ * ZSTD_decompressContinue() is very sensitive to contiguity, if 2 blocks don't
+ * follow each other, make sure that either the compressor breaks contiguity at
+ * the same place, or that previous contiguous segment is large enough to
+ * properly handle maximum back-reference.
+ *
+ * A frame is fully decoded when ZSTD_nextSrcSizeToDecompress() returns zero.
+ * Context can then be reset to start a new decompression.
+ *
+ * Note: it's possible to know if next input to present is a header or a block,
+ * using ZSTD_nextInputType(). This information is not required to properly
+ * decode a frame.
+ *
+ * == Special case: skippable frames ==
+ *
+ * Skippable frames allow integration of user-defined data into a flow of
+ * concatenated frames. Skippable frames will be ignored (skipped) by a
+ * decompressor. The format of skippable frames is as follows:
+ * a) Skippable frame ID - 4 Bytes, Little endian format, any value from
+ * 0x184D2A50 to 0x184D2A5F
+ * b) Frame Size - 4 Bytes, Little endian format, unsigned 32-bits
+ * c) Frame Content - any content (User Data) of length equal to Frame Size
+ * For skippable frames ZSTD_decompressContinue() always returns 0.
+ * For skippable frames ZSTD_getFrameParams() returns fparamsPtr->windowLog==0
+ * what means that a frame is skippable.
+ * Note: If fparamsPtr->frameContentSize==0, it is ambiguous: the frame might
+ * actually be a zstd encoded frame with no content. For purposes of
+ * decompression, it is valid in both cases to skip the frame using
+ * ZSTD_findFrameCompressedSize() to find its size in bytes.
+ * It also returns frame size as fparamsPtr->frameContentSize.
+ ******************************************************************************/
+
+/*===== Buffer-less streaming decompression functions =====*/
+size_t ZSTD_decompressBegin(ZSTD_DCtx *dctx);
+size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx *dctx, const void *dict,
+ size_t dictSize);
+void ZSTD_copyDCtx(ZSTD_DCtx *dctx, const ZSTD_DCtx *preparedDCtx);
+size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx *dctx);
+size_t ZSTD_decompressContinue(ZSTD_DCtx *dctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize);
+typedef enum {
+ ZSTDnit_frameHeader,
+ ZSTDnit_blockHeader,
+ ZSTDnit_block,
+ ZSTDnit_lastBlock,
+ ZSTDnit_checksum,
+ ZSTDnit_skippableFrame
+} ZSTD_nextInputType_e;
+ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx *dctx);
+
+/*-*****************************************************************************
+ * Block functions
+ *
+ * Block functions produce and decode raw zstd blocks, without frame metadata.
+ * Frame metadata cost is typically ~18 bytes, which can be non-negligible for
+ * very small blocks (< 100 bytes). User will have to take in charge required
+ * information to regenerate data, such as compressed and content sizes.
+ *
+ * A few rules to respect:
+ * - Compressing and decompressing require a context structure
+ * + Use ZSTD_initCCtx() and ZSTD_initDCtx()
+ * - It is necessary to init context before starting
+ * + compression : ZSTD_compressBegin()
+ * + decompression : ZSTD_decompressBegin()
+ * + variants _usingDict() are also allowed
+ * + copyCCtx() and copyDCtx() work too
+ * - Block size is limited, it must be <= ZSTD_getBlockSizeMax()
+ * + If you need to compress more, cut data into multiple blocks
+ * + Consider using the regular ZSTD_compress() instead, as frame metadata
+ * costs become negligible when source size is large.
+ * - When a block is considered not compressible enough, ZSTD_compressBlock()
+ * result will be zero. In which case, nothing is produced into `dst`.
+ * + User must test for such outcome and deal directly with uncompressed data
+ * + ZSTD_decompressBlock() doesn't accept uncompressed data as input!!!
+ * + In case of multiple successive blocks, decoder must be informed of
+ * uncompressed block existence to follow proper history. Use
+ * ZSTD_insertBlock() in such a case.
+ ******************************************************************************/
+
+/* Define for static allocation */
+#define ZSTD_BLOCKSIZE_ABSOLUTEMAX (128 * 1024)
+/*===== Raw zstd block functions =====*/
+size_t ZSTD_getBlockSizeMax(ZSTD_CCtx *cctx);
+size_t ZSTD_compressBlock(ZSTD_CCtx *cctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize);
+size_t ZSTD_decompressBlock(ZSTD_DCtx *dctx, void *dst, size_t dstCapacity,
+ const void *src, size_t srcSize);
+size_t ZSTD_insertBlock(ZSTD_DCtx *dctx, const void *blockStart,
+ size_t blockSize);
+
+#endif /* ZSTD_H */
@@ -91,11 +91,15 @@
static int INIT handle_zstd_error(size_t ret, void (*error)(char *x))
{
- const int err = ZSTD_getErrorCode(ret);
+ const zstd_error_code err = zstd_get_error_code(ret);
- if (!ZSTD_isError(ret))
+ if (!zstd_is_error(ret))
return 0;
+ /*
+ * zstd_get_error_name() cannot be used because error takes a char *
+ * not a const char *
+ */
switch (err) {
case ZSTD_error_memory_allocation:
error("ZSTD decompressor ran out of memory");
@@ -124,28 +128,28 @@ static int INIT decompress_single(const u8 *in_buf, long in_len, u8 *out_buf,
long out_len, long *in_pos,
void (*error)(char *x))
{
- const size_t wksp_size = ZSTD_DCtxWorkspaceBound();
+ const size_t wksp_size = zstd_dctx_workspace_bound();
void *wksp = large_malloc(wksp_size);
- ZSTD_DCtx *dctx = ZSTD_initDCtx(wksp, wksp_size);
+ zstd_dctx *dctx = zstd_init_dctx(wksp, wksp_size);
int err;
size_t ret;
if (dctx == NULL) {
- error("Out of memory while allocating ZSTD_DCtx");
+ error("Out of memory while allocating zstd_dctx");
err = -1;
goto out;
}
/*
* Find out how large the frame actually is, there may be junk at
- * the end of the frame that ZSTD_decompressDCtx() can't handle.
+ * the end of the frame that zstd_decompress_dctx() can't handle.
*/
- ret = ZSTD_findFrameCompressedSize(in_buf, in_len);
+ ret = zstd_find_frame_compressed_size(in_buf, in_len);
err = handle_zstd_error(ret, error);
if (err)
goto out;
in_len = (long)ret;
- ret = ZSTD_decompressDCtx(dctx, out_buf, out_len, in_buf, in_len);
+ ret = zstd_decompress_dctx(dctx, out_buf, out_len, in_buf, in_len);
err = handle_zstd_error(ret, error);
if (err)
goto out;
@@ -167,14 +171,14 @@ static int INIT __unzstd(unsigned char *in_buf, long in_len,
long *in_pos,
void (*error)(char *x))
{
- ZSTD_inBuffer in;
- ZSTD_outBuffer out;
- ZSTD_frameParams params;
+ zstd_in_buffer in;
+ zstd_out_buffer out;
+ zstd_frame_header header;
void *in_allocated = NULL;
void *out_allocated = NULL;
void *wksp = NULL;
size_t wksp_size;
- ZSTD_DStream *dstream;
+ zstd_dstream *dstream;
int err;
size_t ret;
@@ -238,13 +242,13 @@ static int INIT __unzstd(unsigned char *in_buf, long in_len,
out.size = out_len;
/*
- * We need to know the window size to allocate the ZSTD_DStream.
+ * We need to know the window size to allocate the zstd_dstream.
* Since we are streaming, we need to allocate a buffer for the sliding
* window. The window size varies from 1 KB to ZSTD_WINDOWSIZE_MAX
* (8 MB), so it is important to use the actual value so as not to
* waste memory when it is smaller.
*/
- ret = ZSTD_getFrameParams(¶ms, in.src, in.size);
+ ret = zstd_get_frame_header(&header, in.src, in.size);
err = handle_zstd_error(ret, error);
if (err)
goto out;
@@ -253,19 +257,19 @@ static int INIT __unzstd(unsigned char *in_buf, long in_len,
err = -1;
goto out;
}
- if (params.windowSize > ZSTD_WINDOWSIZE_MAX) {
+ if (header.windowSize > ZSTD_WINDOWSIZE_MAX) {
error("ZSTD-compressed data has too large a window size");
err = -1;
goto out;
}
/*
- * Allocate the ZSTD_DStream now that we know how much memory is
+ * Allocate the zstd_dstream now that we know how much memory is
* required.
*/
- wksp_size = ZSTD_DStreamWorkspaceBound(params.windowSize);
+ wksp_size = zstd_dstream_workspace_bound(header.windowSize);
wksp = large_malloc(wksp_size);
- dstream = ZSTD_initDStream(params.windowSize, wksp, wksp_size);
+ dstream = zstd_init_dstream(header.windowSize, wksp, wksp_size);
if (dstream == NULL) {
error("Out of memory while allocating ZSTD_DStream");
err = -1;
@@ -298,7 +302,7 @@ static int INIT __unzstd(unsigned char *in_buf, long in_len,
in.size = in_len;
}
/* Returns zero when the frame is complete. */
- ret = ZSTD_decompressStream(dstream, &out, &in);
+ ret = zstd_decompress_stream(dstream, &out, &in);
err = handle_zstd_error(ret, error);
if (err)
goto out;
@@ -3443,43 +3443,92 @@ ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSize,
return params;
}
-EXPORT_SYMBOL(ZSTD_maxCLevel);
-EXPORT_SYMBOL(ZSTD_compressBound);
-
-EXPORT_SYMBOL(ZSTD_CCtxWorkspaceBound);
-EXPORT_SYMBOL(ZSTD_initCCtx);
-EXPORT_SYMBOL(ZSTD_compressCCtx);
-EXPORT_SYMBOL(ZSTD_compress_usingDict);
-
-EXPORT_SYMBOL(ZSTD_CDictWorkspaceBound);
-EXPORT_SYMBOL(ZSTD_initCDict);
-EXPORT_SYMBOL(ZSTD_compress_usingCDict);
-
-EXPORT_SYMBOL(ZSTD_CStreamWorkspaceBound);
-EXPORT_SYMBOL(ZSTD_initCStream);
-EXPORT_SYMBOL(ZSTD_initCStream_usingCDict);
-EXPORT_SYMBOL(ZSTD_resetCStream);
-EXPORT_SYMBOL(ZSTD_compressStream);
-EXPORT_SYMBOL(ZSTD_flushStream);
-EXPORT_SYMBOL(ZSTD_endStream);
-EXPORT_SYMBOL(ZSTD_CStreamInSize);
-EXPORT_SYMBOL(ZSTD_CStreamOutSize);
-
-EXPORT_SYMBOL(ZSTD_getCParams);
-EXPORT_SYMBOL(ZSTD_getParams);
-EXPORT_SYMBOL(ZSTD_checkCParams);
-EXPORT_SYMBOL(ZSTD_adjustCParams);
-
-EXPORT_SYMBOL(ZSTD_compressBegin);
-EXPORT_SYMBOL(ZSTD_compressBegin_usingDict);
-EXPORT_SYMBOL(ZSTD_compressBegin_advanced);
-EXPORT_SYMBOL(ZSTD_copyCCtx);
-EXPORT_SYMBOL(ZSTD_compressBegin_usingCDict);
-EXPORT_SYMBOL(ZSTD_compressContinue);
-EXPORT_SYMBOL(ZSTD_compressEnd);
-
-EXPORT_SYMBOL(ZSTD_getBlockSizeMax);
-EXPORT_SYMBOL(ZSTD_compressBlock);
+size_t zstd_compress_bound(size_t src_size)
+{
+ return ZSTD_compressBound(src_size);
+}
+EXPORT_SYMBOL(zstd_compress_bound);
+
+int zstd_min_clevel(void)
+{
+ /*
+ * zstd-1.3.1 doesn't implement ZSTD_minCLevel().
+ * Return 0 (default level).
+ */
+ return 0;
+}
+EXPORT_SYMBOL(zstd_min_clevel);
+
+int zstd_max_clevel(void)
+{
+ return ZSTD_maxCLevel();
+}
+EXPORT_SYMBOL(zstd_max_clevel);
+
+zstd_parameters zstd_get_params(int level,
+ unsigned long long estimated_src_size)
+{
+ return ZSTD_getParams(level, estimated_src_size, 0);
+}
+EXPORT_SYMBOL(zstd_get_params);
+
+size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *cparams)
+{
+ return ZSTD_CCtxWorkspaceBound(*cparams);
+}
+EXPORT_SYMBOL(zstd_cctx_workspace_bound);
+
+zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size)
+{
+ return ZSTD_initCCtx(workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_cctx);
+
+size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
+ const void *src, size_t src_size, const zstd_parameters *parameters)
+{
+ return ZSTD_compressCCtx(cctx, dst, dst_capacity, src, src_size, *parameters);
+}
+EXPORT_SYMBOL(zstd_compress_cctx);
+
+size_t zstd_cstream_workspace_bound(const zstd_compression_parameters *cparams)
+{
+ return ZSTD_CStreamWorkspaceBound(*cparams);
+}
+EXPORT_SYMBOL(zstd_cstream_workspace_bound);
+
+zstd_cstream *zstd_init_cstream(const zstd_parameters *parameters,
+ unsigned long long pledged_src_size, void *workspace, size_t workspace_size)
+{
+ return ZSTD_initCStream(*parameters, pledged_src_size, workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_cstream);
+
+size_t zstd_reset_cstream(zstd_cstream *cstream,
+ unsigned long long pledged_src_size)
+{
+ return ZSTD_resetCStream(cstream, pledged_src_size);
+}
+EXPORT_SYMBOL(zstd_reset_cstream);
+
+size_t zstd_compress_stream(zstd_cstream *cstream, zstd_out_buffer *output,
+ zstd_in_buffer *input)
+{
+ return ZSTD_compressStream(cstream, output, input);
+}
+EXPORT_SYMBOL(zstd_compress_stream);
+
+size_t zstd_flush_stream(zstd_cstream *cstream, zstd_out_buffer *output)
+{
+ return ZSTD_flushStream(cstream, output);
+}
+EXPORT_SYMBOL(zstd_flush_stream);
+
+size_t zstd_end_stream(zstd_cstream *cstream, zstd_out_buffer *output)
+{
+ return ZSTD_endStream(cstream, output);
+}
+EXPORT_SYMBOL(zstd_end_stream);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Zstd Compressor");
@@ -2490,42 +2490,82 @@ size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output, ZSTD_inB
}
}
-EXPORT_SYMBOL(ZSTD_DCtxWorkspaceBound);
-EXPORT_SYMBOL(ZSTD_initDCtx);
-EXPORT_SYMBOL(ZSTD_decompressDCtx);
-EXPORT_SYMBOL(ZSTD_decompress_usingDict);
-
-EXPORT_SYMBOL(ZSTD_DDictWorkspaceBound);
-EXPORT_SYMBOL(ZSTD_initDDict);
-EXPORT_SYMBOL(ZSTD_decompress_usingDDict);
-
-EXPORT_SYMBOL(ZSTD_DStreamWorkspaceBound);
-EXPORT_SYMBOL(ZSTD_initDStream);
-EXPORT_SYMBOL(ZSTD_initDStream_usingDDict);
-EXPORT_SYMBOL(ZSTD_resetDStream);
-EXPORT_SYMBOL(ZSTD_decompressStream);
-EXPORT_SYMBOL(ZSTD_DStreamInSize);
-EXPORT_SYMBOL(ZSTD_DStreamOutSize);
-
-EXPORT_SYMBOL(ZSTD_findFrameCompressedSize);
-EXPORT_SYMBOL(ZSTD_getFrameContentSize);
-EXPORT_SYMBOL(ZSTD_findDecompressedSize);
-
-EXPORT_SYMBOL(ZSTD_isFrame);
-EXPORT_SYMBOL(ZSTD_getDictID_fromDict);
-EXPORT_SYMBOL(ZSTD_getDictID_fromDDict);
-EXPORT_SYMBOL(ZSTD_getDictID_fromFrame);
-
-EXPORT_SYMBOL(ZSTD_getFrameParams);
-EXPORT_SYMBOL(ZSTD_decompressBegin);
-EXPORT_SYMBOL(ZSTD_decompressBegin_usingDict);
-EXPORT_SYMBOL(ZSTD_copyDCtx);
-EXPORT_SYMBOL(ZSTD_nextSrcSizeToDecompress);
-EXPORT_SYMBOL(ZSTD_decompressContinue);
-EXPORT_SYMBOL(ZSTD_nextInputType);
-
-EXPORT_SYMBOL(ZSTD_decompressBlock);
-EXPORT_SYMBOL(ZSTD_insertBlock);
+unsigned int zstd_is_error(size_t code)
+{
+ return ZSTD_isError(code);
+}
+EXPORT_SYMBOL(zstd_is_error);
+
+zstd_error_code zstd_get_error_code(size_t code)
+{
+ return ZSTD_getErrorCode(code);
+}
+EXPORT_SYMBOL(zstd_get_error_code);
+
+const char *zstd_get_error_name(size_t code)
+{
+ /* Real implementation in zstd-1.4.6. */
+ return "GENERIC";
+}
+EXPORT_SYMBOL(zstd_get_error_name);
+
+size_t zstd_dctx_workspace_bound(void)
+{
+ return ZSTD_DCtxWorkspaceBound();
+}
+EXPORT_SYMBOL(zstd_dctx_workspace_bound);
+
+zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size)
+{
+ return ZSTD_initDCtx(workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_dctx);
+
+size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
+ const void *src, size_t src_size)
+{
+ return ZSTD_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
+}
+EXPORT_SYMBOL(zstd_decompress_dctx);
+
+size_t zstd_dstream_workspace_bound(size_t max_window_size)
+{
+ return ZSTD_DStreamWorkspaceBound(max_window_size);
+}
+EXPORT_SYMBOL(zstd_dstream_workspace_bound);
+
+zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
+ size_t workspace_size)
+{
+ return ZSTD_initDStream(max_window_size, workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_dstream);
+
+size_t zstd_reset_dstream(zstd_dstream *dstream)
+{
+ return ZSTD_resetDStream(dstream);
+}
+EXPORT_SYMBOL(zstd_reset_dstream);
+
+size_t zstd_decompress_stream(zstd_dstream *dstream, zstd_out_buffer *output,
+ zstd_in_buffer *input)
+{
+ return ZSTD_decompressStream(dstream, output, input);
+}
+EXPORT_SYMBOL(zstd_decompress_stream);
+
+size_t zstd_find_frame_compressed_size(const void *src, size_t src_size)
+{
+ return ZSTD_findFrameCompressedSize(src, src_size);
+}
+EXPORT_SYMBOL(zstd_find_frame_compressed_size);
+
+size_t zstd_get_frame_header(zstd_frame_header *header, const void *src,
+ size_t src_size)
+{
+ return ZSTD_getFrameParams(header, src, src_size);
+}
+EXPORT_SYMBOL(zstd_get_frame_header);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Zstd Decompressor");