From patchwork Tue Dec 21 11:51:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Han Xin X-Patchwork-Id: 12689573 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44880C433EF for ; Tue, 21 Dec 2021 11:54:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237306AbhLULyX (ORCPT ); Tue, 21 Dec 2021 06:54:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230245AbhLULyX (ORCPT ); Tue, 21 Dec 2021 06:54:23 -0500 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 068C8C06173F for ; Tue, 21 Dec 2021 03:54:23 -0800 (PST) Received: by mail-pg1-x535.google.com with SMTP id g2so9546580pgo.9 for ; Tue, 21 Dec 2021 03:54:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=n3urYzHYUkeKMa/G9nrDCMMil6jsiAeI2j0Zt4p2eys=; b=JJ8Tn52SqDqKZLfEdc45oWkt0xL28NPwfpoYcuFytTx7L5+Nhol1VWs1iQ35cpOB9g CIV9oyW6KHF3jazp3hEjykfKI8EEnwFxvF9R0Hna5i9Jzb0+sf6h78BigItucfs92GHO sWGL5/7qZA+tteS4uW26ltw/vdRhER0ls19ZJP9vgtmDS3ZfYSKRVWDUIS9ZlZkUvhQm HE8zVNMLFfItG3KVm4cxN1enfAL+KmFvarH9hxGR8qBtcwEtSiSgsUWsP2KabgUu9WHk CdmM2NgRtp7Smo08mbykwlVEgr9RXJk2LDj+ltZwmyxDDmv6k/g5iki/dG3jie6UIaCO Lu8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=n3urYzHYUkeKMa/G9nrDCMMil6jsiAeI2j0Zt4p2eys=; b=e4N0GGMve13o1DosMXKIFwb30AG0yhAS4t9xS6isBOCa5CpeN0x8LZo8gLbJCrWhNE XdFk6qYXuKAJuSG4mkUpC8QwQqkWVCxzRoHizfEpeD/0jQW9B433ymRZk7tGtpJK5uDD Zqh2ML7IaiIksz/tCH+03qHrhP08awi/wJ10j0ajuOPEein8WkvAfcx8+VQZQLwVjkkk AJs77NHcEBKqvPjc+7hxBIHWPzP8ww37DratGhQkLUFLiS38QUE/gAg31Me9bGVeLHus tUQMjRTZ9TNE0hwoALhruBUz3eREBTc1SEy9mNzHhJnX3b4pz4y4vFS6thj/cA0bxHeA 1Cpg== X-Gm-Message-State: AOAM530unVx+/BEO5eR8mGg1kDM4GJAWFcEIK/gjwOudWy8tUw/nF1Py 6+xHZQwgOuqWRbRJ486Wmd4= X-Google-Smtp-Source: ABdhPJwzplHRj9r3vjwNwYXrNWxTqqn+lo5UD7FOlRLCsCAwT+q4YO6O2TAIirzKU+YiQVoBQrpuVg== X-Received: by 2002:a63:9143:: with SMTP id l64mr360365pge.495.1640087662576; Tue, 21 Dec 2021 03:54:22 -0800 (PST) Received: from localhost.localdomain ([205.204.117.103]) by smtp.gmail.com with ESMTPSA id s30sm20513742pfw.57.2021.12.21.03.54.19 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Dec 2021 03:54:22 -0800 (PST) From: Han Xin To: Junio C Hamano , Git List , Jeff King , Jiang Xin , Philip Oakley , =?utf-8?b?w4Z2YXIgQXJuZmrDtnLDsCBC?= =?utf-8?b?amFybWFzb24=?= , Derrick Stolee , =?utf-8?q?Ren=C3=A9_Scharfe?= Cc: Han Xin Subject: [PATCH v7 2/5] object-file API: add a format_object_header() function Date: Tue, 21 Dec 2021 19:51:58 +0800 Message-Id: <20211221115201.12120-3-chiyutianyi@gmail.com> X-Mailer: git-send-email 2.34.1.52.g80008efde6.agit.6.5.6 In-Reply-To: <20211217112629.12334-1-chiyutianyi@gmail.com> References: <20211217112629.12334-1-chiyutianyi@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Ævar Arnfjörð Bjarmason Add a convenience function to wrap the xsnprintf() command that generates loose object headers. This code was copy/pasted in various parts of the codebase, let's define it in one place and re-use it from there. All except one caller of it had a valid "enum object_type" for us, it's only write_object_file_prepare() which might need to deal with "git hash-object --literally" and a potential garbage type. Let's have the primary API use an "enum object_type", and define an *_extended() function that can take an arbitrary "const char *" for the type. See [1] for the discussion that prompted this patch, i.e. new code in object-file.c that wanted to copy/paste the xsnprintf() invocation. 1. https://lore.kernel.org/git/211213.86bl1l9bfz.gmgdl@evledraar.gmail.com/ Signed-off-by: Ævar Arnfjörð Bjarmason Signed-off-by: Han Xin --- builtin/index-pack.c | 3 +-- bulk-checkin.c | 4 ++-- cache.h | 21 +++++++++++++++++++++ http-push.c | 2 +- object-file.c | 14 +++++++++++--- 5 files changed, 36 insertions(+), 8 deletions(-) diff --git a/builtin/index-pack.c b/builtin/index-pack.c index c23d01de7d..4a765ddae6 100644 --- a/builtin/index-pack.c +++ b/builtin/index-pack.c @@ -449,8 +449,7 @@ static void *unpack_entry_data(off_t offset, unsigned long size, int hdrlen; if (!is_delta_type(type)) { - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX, - type_name(type),(uintmax_t)size) + 1; + hdrlen = format_object_header(hdr, sizeof(hdr), type, (uintmax_t)size); the_hash_algo->init_fn(&c); the_hash_algo->update_fn(&c, hdr, hdrlen); } else diff --git a/bulk-checkin.c b/bulk-checkin.c index 8785b2ac80..1733a1de4f 100644 --- a/bulk-checkin.c +++ b/bulk-checkin.c @@ -220,8 +220,8 @@ static int deflate_to_pack(struct bulk_checkin_state *state, if (seekback == (off_t) -1) return error("cannot find the current offset"); - header_len = xsnprintf((char *)obuf, sizeof(obuf), "%s %" PRIuMAX, - type_name(type), (uintmax_t)size) + 1; + header_len = format_object_header((char *)obuf, sizeof(obuf), + type, (uintmax_t)size); the_hash_algo->init_fn(&ctx); the_hash_algo->update_fn(&ctx, obuf, header_len); diff --git a/cache.h b/cache.h index cfba463aa9..64071a8d80 100644 --- a/cache.h +++ b/cache.h @@ -1310,6 +1310,27 @@ enum unpack_loose_header_result unpack_loose_header(git_zstream *stream, unsigned long bufsiz, struct strbuf *hdrbuf); +/** + * format_object_header() is a thin wrapper around s xsnprintf() that + * writes the initial " " part of the loose object + * header. It returns the size that snprintf() returns + 1. + * + * The format_object_header_extended() function allows for writing a + * type_name that's not one of the "enum object_type" types. This is + * used for "git hash-object --literally". Pass in a OBJ_NONE as the + * type, and a non-NULL "type_str" to do that. + * + * format_object_header() is a convenience wrapper for + * format_object_header_extended(). + */ +int format_object_header_extended(char *str, size_t size, enum object_type type, + const char *type_str, size_t objsize); +static inline int format_object_header(char *str, size_t size, + enum object_type type, size_t objsize) +{ + return format_object_header_extended(str, size, type, NULL, objsize); +} + /** * parse_loose_header() parses the starting " \0" of an * object. If it doesn't follow that format -1 is returned. To check diff --git a/http-push.c b/http-push.c index 3309aaf004..f55e316ff4 100644 --- a/http-push.c +++ b/http-push.c @@ -363,7 +363,7 @@ static void start_put(struct transfer_request *request) git_zstream stream; unpacked = read_object_file(&request->obj->oid, &type, &len); - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; + hdrlen = format_object_header(hdr, sizeof(hdr), type, (uintmax_t)len); /* Set it up */ git_deflate_init(&stream, zlib_compression_level); diff --git a/object-file.c b/object-file.c index eb1426f98c..6bba4766f9 100644 --- a/object-file.c +++ b/object-file.c @@ -1006,6 +1006,14 @@ void *xmmap(void *start, size_t length, return ret; } +int format_object_header_extended(char *str, size_t size, enum object_type type, + const char *typestr, size_t objsize) +{ + const char *s = type == OBJ_NONE ? typestr : type_name(type); + + return xsnprintf(str, size, "%s %"PRIuMAX, s, (uintmax_t)objsize) + 1; +} + /* * With an in-core object data in "map", rehash it to make sure the * object name actually matches "oid" to detect object corruption. @@ -1034,7 +1042,7 @@ int check_object_signature(struct repository *r, const struct object_id *oid, return -1; /* Generate the header */ - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1; + hdrlen = format_object_header(hdr, sizeof(hdr), obj_type, size); /* Sha1.. */ r->hash_algo->init_fn(&c); @@ -1734,7 +1742,7 @@ static void write_object_file_prepare(const struct git_hash_algo *algo, git_hash_ctx c; /* Generate the header */ - *hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1; + *hdrlen = format_object_header_extended(hdr, *hdrlen, OBJ_NONE, type, len); /* Sha1.. */ algo->init_fn(&c); @@ -2006,7 +2014,7 @@ int force_object_loose(const struct object_id *oid, time_t mtime) buf = read_object(the_repository, oid, &type, &len); if (!buf) return error(_("cannot read object for %s"), oid_to_hex(oid)); - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1; + hdrlen = format_object_header(hdr, sizeof(hdr), type, len); ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime, 0); free(buf);