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(const 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)
  18                 obj->type = blob_type;
  19         if (obj->type != blob_type) {
  20                 error("Object %s is a %s, not a blob",
  21                       sha1_to_hex(sha1), obj->type);
  22                 return NULL;
  23         }
  24         return (struct blob *) obj;
  25 }
  26
  27 int parse_blob_buffer(struct blob *item, void *buffer, unsigned long size)
  28 {
  29         item->object.parsed = 1;
  30         return 0;
  31 }
  32
  33 int parse_blob(struct blob *item)
  34 {
  35         char type[20];
  36         void *buffer;
  37         unsigned long size;
  38         int ret;
  39
  40         if (item->object.parsed)
  41                 return 0;
  42         buffer = read_sha1_file(item->object.sha1, type, &size);
  43         if (!buffer)
  44                 return error("Could not read %s",
  45                              sha1_to_hex(item->object.sha1));
  46         if (strcmp(type, blob_type))
  47                 return error("Object %s not a blob",
  48                              sha1_to_hex(item->object.sha1));
  49         ret = parse_blob_buffer(item, buffer, size);
  50         free(buffer);
  51         return ret;
  52 }