Andrew's git - gitweb.git/blob

ceb86557c5eedb03cbdc81929b7d109b44d440d5
   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                if (((struct tag *)o)->tagged)
  13                        o = parse_object(((struct tag *)o)->tagged->sha1);
  14                else
  15                        o = NULL;
  16        if (!o && warn) {
  17                if (!warnlen)
  18                        warnlen = strlen(warn);
  19                error("missing object referenced by '%.*s'", warnlen, warn);
  20        }
  21        return o;
  22}
  23
  24struct tag *lookup_tag(const unsigned char *sha1)
  25{
  26        struct object *obj = lookup_object(sha1);
  27        if (!obj)
  28                return create_object(sha1, OBJ_TAG, alloc_tag_node());
  29        if (!obj->type)
  30                obj->type = OBJ_TAG;
  31        if (obj->type != OBJ_TAG) {
  32                error("Object %s is a %s, not a tag",
  33                      sha1_to_hex(sha1), typename(obj->type));
  34                return NULL;
  35        }
  36        return (struct tag *) obj;
  37}
  38
  39int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
  40{
  41        unsigned char sha1[20];
  42        char type[20];
  43        const char *bufptr = data;
  44        const char *tail = bufptr + size;
  45        const char *nl;
  46
  47        if (item->object.parsed)
  48                return 0;
  49        item->object.parsed = 1;
  50
  51        if (size < 64)
  52                return -1;
  53        if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
  54                return -1;
  55        bufptr += 48; /* "object " + sha1 + "\n" */
  56
  57        if (prefixcmp(bufptr, "type "))
  58                return -1;
  59        bufptr += 5;
  60        nl = memchr(bufptr, '\n', tail - bufptr);
  61        if (!nl || sizeof(type) <= (nl - bufptr))
  62                return -1;
  63        strncpy(type, bufptr, nl - bufptr);
  64        type[nl - bufptr] = '\0';
  65        bufptr = nl + 1;
  66
  67        if (!strcmp(type, blob_type)) {
  68                item->tagged = &lookup_blob(sha1)->object;
  69        } else if (!strcmp(type, tree_type)) {
  70                item->tagged = &lookup_tree(sha1)->object;
  71        } else if (!strcmp(type, commit_type)) {
  72                item->tagged = &lookup_commit(sha1)->object;
  73        } else if (!strcmp(type, tag_type)) {
  74                item->tagged = &lookup_tag(sha1)->object;
  75        } else {
  76                error("Unknown type %s", type);
  77                item->tagged = NULL;
  78        }
  79
  80        if (prefixcmp(bufptr, "tag "))
  81                return -1;
  82        bufptr += 4;
  83        nl = memchr(bufptr, '\n', tail - bufptr);
  84        if (!nl)
  85                return -1;
  86        item->tag = xmemdupz(bufptr, nl - bufptr);
  87        bufptr = nl + 1;
  88
  89        return 0;
  90}
  91
  92int parse_tag(struct tag *item)
  93{
  94        enum object_type type;
  95        void *data;
  96        unsigned long size;
  97        int ret;
  98
  99        if (item->object.parsed)
 100                return 0;
 101        data = read_sha1_file(item->object.sha1, &type, &size);
 102        if (!data)
 103                return error("Could not read %s",
 104                             sha1_to_hex(item->object.sha1));
 105        if (type != OBJ_TAG) {
 106                free(data);
 107                return error("Object %s not a tag",
 108                             sha1_to_hex(item->object.sha1));
 109        }
 110        ret = parse_tag_buffer(item, data, size);
 111        free(data);
 112        return ret;
 113}