blob.c

   1 #include "blob.h"
   2 #include "cache.h"
   3 #include <stdlib.h>
   4
   5 const char *blob_type = "blob";
   6
   7 struct blob *lookup_blob(unsigned char *sha1)
   8 {
   9         struct object *obj = lookup_object(sha1);
  10         if (!obj) {
  11                 struct blob *ret = xmalloc(sizeof(struct blob));
  12                 memset(ret, 0, sizeof(struct blob));
  13                 created_object(sha1, &ret->object);
  14                 ret->object.type = blob_type;
  15                 return ret;
  16         }
  17         if (obj->type != blob_type) {
  18                 error("Object %s is a %s, not a blob",
  19                       sha1_to_hex(sha1), obj->type);
  20                 return NULL;
  21         }
  22         return (struct blob *) obj;
  23 }
  24
  25 int parse_blob(struct blob *item)
  26 {
  27         char type[20];
  28         void *buffer;
  29         unsigned long size;
  30         if (item->object.parsed)
  31                 return 0;
  32         item->object.parsed = 1;
  33         buffer = read_sha1_file(item->object.sha1, type, &size);
  34         if (!buffer)
  35                 return error("Could not read %s",
  36                              sha1_to_hex(item->object.sha1));
  37         if (strcmp(type, blob_type))
  38                 return error("Object %s not a blob",
  39                              sha1_to_hex(item->object.sha1));
  40         return 0;
  41 }