Andrew's git - gitweb.git/blob

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