Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "tag.h"
   3#include "commit.h"
   4#include "tree.h"
   5#include "blob.h"
   6
   7const char *tag_type = "tag";
   8
   9struct object *deref_tag(struct object *o, const char *warn, int warnlen)
  10{
  11        while (o && o->type == OBJ_TAG)
  12                o = parse_object(((struct tag *)o)->tagged->sha1);
  13        if (!o && warn) {
  14                if (!warnlen)
  15                        warnlen = strlen(warn);
  16                error("missing object referenced by '%.*s'", warnlen, warn);
  17        }
  18        return o;
  19}
  20
  21struct tag *lookup_tag(const unsigned char *sha1)
  22{
  23        struct object *obj = lookup_object(sha1);
  24        if (!obj)
  25                return create_object(sha1, OBJ_TAG, alloc_tag_node());
  26        if (!obj->type)
  27                obj->type = OBJ_TAG;
  28        if (obj->type != OBJ_TAG) {
  29                error("Object %s is a %s, not a tag",
  30                      sha1_to_hex(sha1), typename(obj->type));
  31                return NULL;
  32        }
  33        return (struct tag *) obj;
  34}
  35
  36int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
  37{
  38        int typelen, taglen;
  39        unsigned char sha1[20];
  40        const char *type_line, *tag_line, *sig_line;
  41        char type[20];
  42        const char *start = data;
  43
  44        if (item->object.parsed)
  45                return 0;
  46        item->object.parsed = 1;
  47
  48        if (size < 64)
  49                return -1;
  50        if (memcmp("object ", data, 7) || get_sha1_hex((char *) data + 7, sha1))
  51                return -1;
  52
  53        type_line = (char *) data + 48;
  54        if (memcmp("\ntype ", type_line-1, 6))
  55                return -1;
  56
  57        tag_line = memchr(type_line, '\n', size - (type_line - start));
  58        if (!tag_line || memcmp("tag ", ++tag_line, 4))
  59                return -1;
  60
  61        sig_line = memchr(tag_line, '\n', size - (tag_line - start));
  62        if (!sig_line)
  63                return -1;
  64        sig_line++;
  65
  66        typelen = tag_line - type_line - strlen("type \n");
  67        if (typelen >= 20)
  68                return -1;
  69        memcpy(type, type_line + 5, typelen);
  70        type[typelen] = '\0';
  71        taglen = sig_line - tag_line - strlen("tag \n");
  72        item->tag = xmemdupz(tag_line + 4, taglen);
  73
  74        if (!strcmp(type, blob_type)) {
  75                item->tagged = &lookup_blob(sha1)->object;
  76        } else if (!strcmp(type, tree_type)) {
  77                item->tagged = &lookup_tree(sha1)->object;
  78        } else if (!strcmp(type, commit_type)) {
  79                item->tagged = &lookup_commit(sha1)->object;
  80        } else if (!strcmp(type, tag_type)) {
  81                item->tagged = &lookup_tag(sha1)->object;
  82        } else {
  83                error("Unknown type %s", type);
  84                item->tagged = NULL;
  85        }
  86
  87        if (item->tagged && track_object_refs) {
  88                struct object_refs *refs = alloc_object_refs(1);
  89                refs->ref[0] = item->tagged;
  90                set_object_refs(&item->object, refs);
  91        }
  92
  93        return 0;
  94}
  95
  96int parse_tag(struct tag *item)
  97{
  98        enum object_type type;
  99        void *data;
 100        unsigned long size;
 101        int ret;
 102
 103        if (item->object.parsed)
 104                return 0;
 105        data = read_sha1_file(item->object.sha1, &type, &size);
 106        if (!data)
 107                return error("Could not read %s",
 108                             sha1_to_hex(item->object.sha1));
 109        if (type != OBJ_TAG) {
 110                free(data);
 111                return error("Object %s not a tag",
 112                             sha1_to_hex(item->object.sha1));
 113        }
 114        ret = parse_tag_buffer(item, data, size);
 115        free(data);
 116        return ret;
 117}