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-rw-r--r--tag.c43
1 files changed, 21 insertions, 22 deletions
diff --git a/tag.c b/tag.c
index 52d71bb..ceb8655 100644
--- a/tag.c
+++ b/tag.c
@@ -38,11 +38,11 @@ struct tag *lookup_tag(const unsigned char *sha1)
int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
{
- int typelen, taglen;
unsigned char sha1[20];
- const char *type_line, *tag_line, *sig_line;
char type[20];
- const char *start = data;
+ const char *bufptr = data;
+ const char *tail = bufptr + size;
+ const char *nl;
if (item->object.parsed)
return 0;
@@ -50,29 +50,19 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
if (size < 64)
return -1;
- if (memcmp("object ", data, 7) || get_sha1_hex((char *) data + 7, sha1))
+ if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
return -1;
+ bufptr += 48; /* "object " + sha1 + "\n" */
- type_line = (char *) data + 48;
- if (memcmp("\ntype ", type_line-1, 6))
+ if (prefixcmp(bufptr, "type "))
return -1;
-
- tag_line = memchr(type_line, '\n', size - (type_line - start));
- if (!tag_line || memcmp("tag ", ++tag_line, 4))
- return -1;
-
- sig_line = memchr(tag_line, '\n', size - (tag_line - start));
- if (!sig_line)
- return -1;
- sig_line++;
-
- typelen = tag_line - type_line - strlen("type \n");
- if (typelen >= 20)
+ bufptr += 5;
+ nl = memchr(bufptr, '\n', tail - bufptr);
+ if (!nl || sizeof(type) <= (nl - bufptr))
return -1;
- memcpy(type, type_line + 5, typelen);
- type[typelen] = '\0';
- taglen = sig_line - tag_line - strlen("tag \n");
- item->tag = xmemdupz(tag_line + 4, taglen);
+ strncpy(type, bufptr, nl - bufptr);
+ type[nl - bufptr] = '\0';
+ bufptr = nl + 1;
if (!strcmp(type, blob_type)) {
item->tagged = &lookup_blob(sha1)->object;
@@ -87,6 +77,15 @@ int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
item->tagged = NULL;
}
+ if (prefixcmp(bufptr, "tag "))
+ return -1;
+ bufptr += 4;
+ nl = memchr(bufptr, '\n', tail - bufptr);
+ if (!nl)
+ return -1;
+ item->tag = xmemdupz(bufptr, nl - bufptr);
+ bufptr = nl + 1;
+
return 0;
}