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Introduced checksum tags for superblock and directory tree.

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This commit is contained in:
Thomas Schmitt
2009-08-16 13:57:42 +02:00
parent 9467f2e644
commit b4e2a60cd9
7 changed files with 319 additions and 57 deletions
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29
libisofs/util.c
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@ -1567,15 +1567,30 @@ int iso_util_decode_md5_tag(char data[2048], uint32_t *pos,
uint32_t *range_start, uint32_t *range_size,
char md5[16], int flag)
{
static char *tag_magic= "libisofs_checksum_tag_v1 pos=";
static int magic_len= 29;
int ret, bin_count, i;
static char *tag_magic[4] = {"",
"libisofs_checksum_tag_v1",
"libisofs_sb_checksum_tag_v1",
"libisofs_tree_checksum_tag_v1"};
static int magic_len[4]= {0, 24, 27, 29};
int ret, bin_count, i, mode, magic_first = 1, magic_last = 3, found = 0;
char *cpt, self_md5[16], tag_md5[16];
void *ctx = NULL;
if (strncmp(data, tag_magic, magic_len) != 0)
return(0);
cpt = data + magic_len;
mode = flag & 255;
if (mode > magic_last)
return ISO_WRONG_ARG_VALUE;
if (mode > 0)
magic_first = magic_last = mode;
for (i = magic_first; i <= magic_last; i++)
if (strncmp(data, tag_magic[i], magic_len[i]) == 0)
break;
if (i > magic_last )
return 0;
found = i;
cpt = data + magic_len[found] + 1;
if (strncmp(cpt, "pos=", 4) != 0)
return 0;
cpt+= 4;
ret = iso_util_dec_to_uint32(cpt, pos, 0);
if (ret <= 0)
return 0;
@ -1615,6 +1630,6 @@ int iso_util_decode_md5_tag(char data[2048], uint32_t *pos,
return ISO_MD5_AREA_CORRUPTED;
if (*(cpt + 5 + 32) != '\n')
return 0;
return(1);
return(found);
}