From 1af64f73a9113b189ce4cc3e422ec927e9b32084 Mon Sep 17 00:00:00 2001 From: "brian m. carlson" Date: Mon, 12 Mar 2018 02:27:55 +0000 Subject: sha1_file: introduce a constant for max header length 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 Signed-off-by: Junio C Hamano --- 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; -- cgit v1.2.3