blob.c

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