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From: "brian m. carlson" <sandals@crustytoothpaste.net>
To: git@vger.kernel.org
Cc: Nguyễn Thái Ngọc Duy  <pclouds@gmail.com>,
	Patryk Obara <patryk.obara@gmail.com>, Jeff King <peff@peff.net>,
	Eric Sunshine <sunshine@sunshineco.com>
Subject: [PATCH v3 35/36] sha1_file: introduce a constant for max header length
Date: Mon, 12 Mar 2018 02:27:55 +0000
Message-ID: <20180312022756.483934-36-sandals@crustytoothpaste.net> (raw)
In-Reply-To: <20180312022756.483934-1-sandals@crustytoothpaste.net>

There were several instances of 32 sprinkled throughout this file, all
of which were used for allocating a buffer to store the header of an
object.  Introduce a constant, MAX_HEADER_LEN, for this purpose.

Note that this constant is slightly larger than required; the longest
possible header is 28 (7 for "commit", 1 for a space, 20 for a 63-bit
length in decimal, and 1 for the NUL).  However, the overallocation
should not cause any problems, so leave it as it is.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
---
 sha1_file.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/sha1_file.c b/sha1_file.c
index 60418da10b..581a9dc522 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -30,6 +30,9 @@
 #include "packfile.h"
 #include "fetch-object.h"
 
+/* The maximum size for an object header. */
+#define MAX_HEADER_LEN 32
+
 const unsigned char null_sha1[GIT_MAX_RAWSZ];
 const struct object_id null_oid;
 const struct object_id empty_tree_oid = {
@@ -791,7 +794,7 @@ int check_object_signature(const struct object_id *oid, void *map,
 	enum object_type obj_type;
 	struct git_istream *st;
 	git_hash_ctx c;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen;
 
 	if (map) {
@@ -1150,7 +1153,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 	unsigned long mapsize;
 	void *map;
 	git_zstream stream;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	struct strbuf hdrbuf = STRBUF_INIT;
 	unsigned long size_scratch;
 
@@ -1514,7 +1517,7 @@ static int write_buffer(int fd, const void *buf, size_t len)
 int hash_object_file(const void *buf, unsigned long len, const char *type,
 		     struct object_id *oid)
 {
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen = sizeof(hdr);
 	write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
 	return 0;
@@ -1669,7 +1672,7 @@ static int freshen_packed_object(const unsigned char *sha1)
 int write_object_file(const void *buf, unsigned long len, const char *type,
 		      struct object_id *oid)
 {
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen = sizeof(hdr);
 
 	/* Normally if we have it in the pack then we do not bother writing
@@ -1689,7 +1692,7 @@ int hash_object_file_literally(const void *buf, unsigned long len,
 	int hdrlen, status = 0;
 
 	/* type string, SP, %lu of the length plus NUL must fit this */
-	hdrlen = strlen(type) + 32;
+	hdrlen = strlen(type) + MAX_HEADER_LEN;
 	header = xmalloc(hdrlen);
 	write_object_file_prepare(buf, len, type, oid, header, &hdrlen);
 
@@ -1709,7 +1712,7 @@ int force_object_loose(const struct object_id *oid, time_t mtime)
 	void *buf;
 	unsigned long len;
 	enum object_type type;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 	int hdrlen;
 	int ret;
 
@@ -2191,7 +2194,7 @@ int read_loose_object(const char *path,
 	void *map = NULL;
 	unsigned long mapsize;
 	git_zstream stream;
-	char hdr[32];
+	char hdr[MAX_HEADER_LEN];
 
 	*contents = NULL;
 

  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-12  2:27 [PATCH v3 00/36] object_id part 12 brian m. carlson
2018-03-12  2:27 ` [PATCH v3 01/36] bulk-checkin: convert index_bulk_checkin to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 03/36] cache-tree: convert write_*_as_tree to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 04/36] cache-tree: convert remnants to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 05/36] resolve-undo: convert struct resolve_undo_info to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 06/36] tree: convert read_tree_recursive to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 07/36] ref-filter: convert grab_objectname " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 08/36] strbuf: convert strbuf_add_unique_abbrev to use " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 09/36] wt-status: convert struct wt_status_state to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 10/36] Convert find_unique_abbrev* to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 11/36] http-walker: convert struct object_request to use " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 12/36] send-pack: convert remaining functions to " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 13/36] replace_object: convert struct replace_object to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 14/36] builtin/mktag: convert to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 15/36] archive: convert write_archive_entry_fn_t to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 16/36] archive: convert sha1_file_to_archive to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 17/36] builtin/index-pack: convert struct ref_delta_entry to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 18/36] sha1_file: convert read_loose_object to use struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 19/36] sha1_file: convert check_sha1_signature to " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 20/36] streaming: convert open_istream to use " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 21/36] builtin/mktree: convert to " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 22/36] sha1_file: convert assert_sha1_type to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 23/36] sha1_file: convert retry_bad_packed_offset to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 24/36] packfile: convert unpack_entry " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 25/36] Convert remaining callers of sha1_object_info_extended to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 26/36] sha1_file: convert sha1_object_info* " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 27/36] builtin/fmt-merge-msg: convert remaining code " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 28/36] builtin/notes: convert static functions " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 29/36] tree-walk: convert get_tree_entry_follow_symlinks internals " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 30/36] streaming: convert istream internals to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 31/36] tree-walk: convert tree entry functions to object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 32/36] sha1_file: convert read_object_with_reference " brian m. carlson
2018-03-12  2:27 ` [PATCH v3 33/36] sha1_file: convert read_sha1_file to struct object_id brian m. carlson
2018-03-12  2:27 ` [PATCH v3 34/36] Convert lookup_replace_object " brian m. carlson
2018-03-12  2:27 ` brian m. carlson [this message]
2018-03-12  2:27 ` [PATCH v3 36/36] convert: convert " brian m. carlson

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