int pread_compressed(Db *db, off_t pos, char **ret_ptr)
{
char *compressed_buf;
char *new_buf;
int len = pread_bin_internal(db, pos, &compressed_buf, 0);
if (len < 0) {
return len;
}
size_t uncompressed_len;
if (snappy_uncompressed_length(compressed_buf, len, &uncompressed_len) != SNAPPY_OK) {
//should be compressed but snappy doesn't see it as valid.
free(compressed_buf);
return COUCHSTORE_ERROR_CORRUPT;
}
new_buf = (char *) malloc(uncompressed_len);
if (!new_buf) {
free(compressed_buf);
return COUCHSTORE_ERROR_ALLOC_FAIL;
}
snappy_status ss = (snappy_uncompress(compressed_buf, len, new_buf, &uncompressed_len));
free(compressed_buf);
if (ss != SNAPPY_OK) {
return COUCHSTORE_ERROR_CORRUPT;
}
*ret_ptr = new_buf;
return (int) uncompressed_len;
}
int pread_header(Db *db, off_t pos, char **ret_ptr)
{
return pread_bin_internal(db, pos + 1, ret_ptr, 1);
}
int pread_bin(tree_file *file, cs_off_t pos, char **ret_ptr)
{
return pread_bin_internal(file, pos, ret_ptr, 0);
}
int pread_bin(Db *db, off_t pos, char **ret_ptr)
{
return pread_bin_internal(db, pos, ret_ptr, 0);
}
int pread_header(tree_file *file, cs_off_t pos, char **ret_ptr)
{
return pread_bin_internal(file, pos + 1, ret_ptr, 1);
}
