mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
![brian m. carlson](/assets/img/avatar_default.png)
To make this code independent of the hash size, verify that the length of the comment is equal to that of any supported hash algorithm. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2005, 2006 Rene Scharfe
|
|
*/
|
|
#include "cache.h"
|
|
#include "commit.h"
|
|
#include "tar.h"
|
|
#include "builtin.h"
|
|
#include "quote.h"
|
|
|
|
static const char builtin_get_tar_commit_id_usage[] =
|
|
"git get-tar-commit-id";
|
|
|
|
/* ustar header + extended global header content */
|
|
#define RECORDSIZE (512)
|
|
#define HEADERSIZE (2 * RECORDSIZE)
|
|
|
|
int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
|
|
{
|
|
char buffer[HEADERSIZE];
|
|
struct ustar_header *header = (struct ustar_header *)buffer;
|
|
char *content = buffer + RECORDSIZE;
|
|
const char *comment;
|
|
ssize_t n;
|
|
long len;
|
|
char *end;
|
|
|
|
if (argc != 1)
|
|
usage(builtin_get_tar_commit_id_usage);
|
|
|
|
n = read_in_full(0, buffer, HEADERSIZE);
|
|
if (n < 0)
|
|
die_errno("git get-tar-commit-id: read error");
|
|
if (n != HEADERSIZE)
|
|
die_errno("git get-tar-commit-id: EOF before reading tar header");
|
|
if (header->typeflag[0] != 'g')
|
|
return 1;
|
|
|
|
len = strtol(content, &end, 10);
|
|
if (errno == ERANGE || end == content || len < 0)
|
|
return 1;
|
|
if (!skip_prefix(end, " comment=", &comment))
|
|
return 1;
|
|
len -= comment - content;
|
|
if (len < 1 || !(len % 2) ||
|
|
hash_algo_by_length((len - 1) / 2) == GIT_HASH_UNKNOWN)
|
|
return 1;
|
|
|
|
if (write_in_full(1, comment, len) < 0)
|
|
die_errno("git get-tar-commit-id: write error");
|
|
|
|
return 0;
|
|
}
|