Andrew's git - gitweb.git/blob

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