blob.c

   1 #include "cache.h"
   2 #include "blob.h"
   3 #include <stdlib.h>
   4
   5 const char *blob_type = "blob";
   6
   7 struct blob *lookup_blob(const unsigned char *sha1)
   8 {
   9         struct object *obj = lookup_object(sha1);
  10         if (!obj) {
  11                 struct blob *ret = xcalloc(1, sizeof(struct blob));
  12                 created_object(sha1, &ret->object);
  13                 ret->object.type = TYPE_BLOB;
  14                 return ret;
  15         }
  16         if (!obj->type)
  17                 obj->type = TYPE_BLOB;
  18         if (obj->type != TYPE_BLOB) {
  19                 error("Object %s is a %s, not a blob",
  20                       sha1_to_hex(sha1), typename(obj->type));
  21                 return NULL;
  22         }
  23         return (struct blob *) obj;
  24 }
  25
  26 int parse_blob_buffer(struct blob *item, void *buffer, unsigned long size)
  27 {
  28         item->object.parsed = 1;
  29         return 0;
  30 }
  31
  32 int parse_blob(struct blob *item)
  33 {
  34         char type[20];
  35         void *buffer;
  36         unsigned long size;
  37         int ret;
  38
  39         if (item->object.parsed)
  40                 return 0;
  41         buffer = read_sha1_file(item->object.sha1, type, &size);
  42         if (!buffer)
  43                 return error("Could not read %s",
  44                              sha1_to_hex(item->object.sha1));
  45         if (strcmp(type, blob_type))
  46                 return error("Object %s not a blob",
  47                              sha1_to_hex(item->object.sha1));
  48         ret = parse_blob_buffer(item, buffer, size);
  49         free(buffer);
  50         return ret;
  51 }