Andrew's git / gitweb.git / tag.c
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tag.con commit [PATCH] Audit rev-parse users. (f6e1a4d)
   1#include "tag.h"
   2#include "cache.h"
   3
   4const char *tag_type = "tag";
   5
   6struct tag *lookup_tag(const 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)
  17                obj->type = tag_type;
  18        if (obj->type != tag_type) {
  19                error("Object %s is a %s, not a tree", 
  20                      sha1_to_hex(sha1), obj->type);
  21                return NULL;
  22        }
  23        return (struct tag *) obj;
  24}
  25
  26int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
  27{
  28        int typelen, taglen;
  29        unsigned char object[20];
  30        const char *type_line, *tag_line, *sig_line;
  31        char type[20];
  32
  33        if (item->object.parsed)
  34                return 0;
  35        item->object.parsed = 1;
  36
  37        if (size < 64)
  38                return -1;
  39        if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
  40                return -1;
  41
  42        type_line = data + 48;
  43        if (memcmp("\ntype ", type_line-1, 6))
  44                return -1;
  45
  46        tag_line = strchr(type_line, '\n');
  47        if (!tag_line || memcmp("tag ", ++tag_line, 4))
  48                return -1;
  49
  50        sig_line = strchr(tag_line, '\n');
  51        if (!sig_line)
  52                return -1;
  53        sig_line++;
  54
  55        typelen = tag_line - type_line - strlen("type \n");
  56        if (typelen >= 20)
  57                return -1;
  58        memcpy(type, type_line + 5, typelen);
  59        type[typelen] = '\0';
  60        taglen = sig_line - tag_line - strlen("tag \n");
  61        item->tag = xmalloc(taglen + 1);
  62        memcpy(item->tag, tag_line + 4, taglen);
  63        item->tag[taglen] = '\0';
  64
  65        item->tagged = lookup_object_type(object, type);
  66        if (item->tagged)
  67                add_ref(&item->object, item->tagged);
  68
  69        return 0;
  70}
  71
  72int parse_tag(struct tag *item)
  73{
  74        char type[20];
  75        void *data;
  76        unsigned long size;
  77        int ret;
  78
  79        if (item->object.parsed)
  80                return 0;
  81        data = read_sha1_file(item->object.sha1, type, &size);
  82        if (!data)
  83                return error("Could not read %s",
  84                             sha1_to_hex(item->object.sha1));
  85        if (strcmp(type, tag_type)) {
  86                free(data);
  87                return error("Object %s not a tag",
  88                             sha1_to_hex(item->object.sha1));
  89        }
  90        ret = parse_tag_buffer(item, data, size);
  91        free(data);
  92        return ret;
  93}