diff options
Diffstat (limited to 'tag.c')
| -rw-r--r-- | tag.c | 118 |
1 files changed, 118 insertions, 0 deletions
@@ -0,0 +1,118 @@ +#include "cache.h" +#include "tag.h" +#include "commit.h" +#include "tree.h" +#include "blob.h" + +const char *tag_type = "tag"; + +struct object *deref_tag(struct object *o, const char *warn, int warnlen) +{ + while (o && o->type == OBJ_TAG) + o = parse_object(((struct tag *)o)->tagged->sha1); + if (!o && warn) { + if (!warnlen) + warnlen = strlen(warn); + error("missing object referenced by '%.*s'", warnlen, warn); + } + return o; +} + +struct tag *lookup_tag(const unsigned char *sha1) +{ + struct object *obj = lookup_object(sha1); + if (!obj) + return create_object(sha1, OBJ_TAG, alloc_tag_node()); + if (!obj->type) + obj->type = OBJ_TAG; + if (obj->type != OBJ_TAG) { + error("Object %s is a %s, not a tag", + sha1_to_hex(sha1), typename(obj->type)); + return NULL; + } + return (struct tag *) obj; +} + +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]; + + if (item->object.parsed) + return 0; + item->object.parsed = 1; + + if (size < 64) + return -1; + if (memcmp("object ", data, 7) || get_sha1_hex((char *) data + 7, sha1)) + return -1; + + type_line = (char *) 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; + memcpy(type, type_line + 5, typelen); + type[typelen] = '\0'; + taglen = sig_line - tag_line - strlen("tag \n"); + item->tag = xmalloc(taglen + 1); + memcpy(item->tag, tag_line + 4, taglen); + item->tag[taglen] = '\0'; + + if (!strcmp(type, blob_type)) { + item->tagged = &lookup_blob(sha1)->object; + } else if (!strcmp(type, tree_type)) { + item->tagged = &lookup_tree(sha1)->object; + } else if (!strcmp(type, commit_type)) { + item->tagged = &lookup_commit(sha1)->object; + } else if (!strcmp(type, tag_type)) { + item->tagged = &lookup_tag(sha1)->object; + } else { + error("Unknown type %s", type); + item->tagged = NULL; + } + + if (item->tagged && track_object_refs) { + struct object_refs *refs = alloc_object_refs(1); + refs->ref[0] = item->tagged; + set_object_refs(&item->object, refs); + } + + return 0; +} + +int parse_tag(struct tag *item) +{ + enum object_type type; + void *data; + unsigned long size; + int ret; + + if (item->object.parsed) + return 0; + data = read_sha1_file(item->object.sha1, &type, &size); + if (!data) + return error("Could not read %s", + sha1_to_hex(item->object.sha1)); + if (type != OBJ_TAG) { + free(data); + return error("Object %s not a tag", + sha1_to_hex(item->object.sha1)); + } + ret = parse_tag_buffer(item, data, size); + free(data); + return ret; +} |