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[98.33.101.203]) by smtp.gmail.com with ESMTPSA id 190sm1100865pfy.22.2020.09.29.23.50.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Sep 2020 23:50:16 -0700 (PDT) From: Nick Terrell To: Herbert Xu Cc: linux-crypto@vger.kernel.org, linux-btrfs@vger.kernel.org, squashfs-devel@lists.sourceforge.net, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Kernel Team , Nick Terrell , Nick Terrell , Chris Mason , Petr Malat , Johannes Weiner , Niket Agarwal , Yann Collet , Christoph Hellwig Subject: [PATCH v4 8/9] lib: unzstd: Switch to the zstd-1.4.6 API Date: Tue, 29 Sep 2020 23:53:17 -0700 Message-Id: <20200930065318.3326526-9-nickrterrell@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200930065318.3326526-1-nickrterrell@gmail.com> References: <20200930065318.3326526-1-nickrterrell@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Nick Terrell Move away from the compatibility wrapper to the zstd-1.4.6 API. This code is functionally equivalent. Signed-off-by: Nick Terrell --- lib/decompress_unzstd.c | 40 ++++++++++++++-------------------------- 1 file changed, 14 insertions(+), 26 deletions(-) diff --git a/lib/decompress_unzstd.c b/lib/decompress_unzstd.c index a79f705f236d..d4685df0e120 100644 --- a/lib/decompress_unzstd.c +++ b/lib/decompress_unzstd.c @@ -73,7 +73,8 @@ #include #include -#include +#include +#include /* 128MB is the maximum window size supported by zstd. */ #define ZSTD_WINDOWSIZE_MAX (1 << ZSTD_WINDOWLOG_MAX) @@ -120,9 +121,9 @@ 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_estimateDCtxSize(); void *wksp = large_malloc(wksp_size); - ZSTD_DCtx *dctx = ZSTD_initDCtx(wksp, wksp_size); + ZSTD_DCtx *dctx = ZSTD_initStaticDCtx(wksp, wksp_size); int err; size_t ret; @@ -165,7 +166,6 @@ static int INIT __unzstd(unsigned char *in_buf, long in_len, { ZSTD_inBuffer in; ZSTD_outBuffer out; - ZSTD_frameParams params; void *in_allocated = NULL; void *out_allocated = NULL; void *wksp = NULL; @@ -229,36 +229,24 @@ 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. - * 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. + * Zstd determines the workspace size from the window size written + * into the frame header. This ensures that we use the minimum value + * possible, since the window size varies from 1 KB to ZSTD_WINDOWSIZE_MAX + * (1 GB), so it is very important to use the actual value. */ - ret = ZSTD_getFrameParams(¶ms, in.src, in.size); + wksp_size = ZSTD_estimateDStreamSize_fromFrame(in.src, in.size); err = handle_zstd_error(ret, error); if (err) goto out; - if (ret != 0) { - error("ZSTD-compressed data has an incomplete frame header"); - err = -1; - goto out; - } - if (params.windowSize > ZSTD_WINDOWSIZE_MAX) { - error("ZSTD-compressed data has too large a window size"); + wksp = large_malloc(wksp_size); + if (wksp == NULL) { + error("Out of memory while allocating ZSTD_DStream"); err = -1; goto out; } - - /* - * Allocate the ZSTD_DStream now that we know how much memory is - * required. - */ - wksp_size = ZSTD_DStreamWorkspaceBound(params.windowSize); - wksp = large_malloc(wksp_size); - dstream = ZSTD_initDStream(params.windowSize, wksp, wksp_size); + dstream = ZSTD_initStaticDStream(wksp, wksp_size); if (dstream == NULL) { - error("Out of memory while allocating ZSTD_DStream"); + error("ZSTD_initStaticDStream failed"); err = -1; goto out; }