diff options
Diffstat (limited to 'tag.c')
| -rw-r--r-- | tag.c | 73 |
1 files changed, 73 insertions, 0 deletions
@@ -0,0 +1,73 @@ +#include "tag.h" +#include "cache.h" + +const char *tag_type = "tag"; + +struct tag *lookup_tag(unsigned char *sha1) +{ + struct object *obj = lookup_object(sha1); + if (!obj) { + struct tag *ret = xmalloc(sizeof(struct tag)); + memset(ret, 0, sizeof(struct tag)); + created_object(sha1, &ret->object); + ret->object.type = tag_type; + return ret; + } + if (obj->type != tag_type) { + error("Object %s is a %s, not a tree", + sha1_to_hex(sha1), obj->type); + return NULL; + } + return (struct tag *) obj; +} + +int parse_tag(struct tag *item) +{ + char type[20]; + void *data, *bufptr; + unsigned long size; + if (item->object.parsed) + return 0; + item->object.parsed = 1; + data = bufptr = read_sha1_file(item->object.sha1, type, &size); + if (!data) + return error("Could not read %s", + sha1_to_hex(item->object.sha1)); + if (strcmp(type, tag_type)) + return error("Object %s not a tag", + sha1_to_hex(item->object.sha1)); + + int typelen, taglen; + unsigned char object[20]; + const char *type_line, *tag_line, *sig_line; + + if (size < 64) + return -1; + if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object)) + return -1; + + item->tagged = parse_object(object); + + type_line = data + 48; + if (memcmp("\ntype ", type_line-1, 6)) + return -1; + + tag_line = strchr(type_line, '\n'); + if (!tag_line || memcmp("tag ", ++tag_line, 4)) + return -1; + + sig_line = strchr(tag_line, '\n'); + if (!sig_line) + return -1; + sig_line++; + + typelen = tag_line - type_line - strlen("type \n"); + if (typelen >= 20) + return -1; + taglen = sig_line - tag_line - strlen("tag \n"); + item->tag = xmalloc(taglen + 1); + memcpy(item->tag, tag_line + 4, taglen); + item->tag[taglen] = '\0'; + + return 0; +} |