zstd_decompress.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */
 
#include <stddef.h>   /* size_t */
 
/******* EXPOSED TYPES ********************************************************/
/*
* Contains the parsed contents of a dictionary
* This includes Huffman and FSE tables used for decoding and data on offsets
*/
typedef struct dictionary_s dictionary_t;
/******* END EXPOSED TYPES ****************************************************/
 
/******* DECOMPRESSION FUNCTIONS **********************************************/
size_t ZSTD_decompress(void *const dst, const size_t dst_len,
                    const void *const src, const size_t src_len);
 
size_t ZSTD_decompress_with_dict(void *const dst, const size_t dst_len,
                              const void *const src, const size_t src_len,
                              dictionary_t* parsed_dict);
 
size_t ZSTD_get_decompressed_size(const void *const src, const size_t src_len);
/******* END DECOMPRESSION FUNCTIONS ******************************************/
 
/******* DICTIONARY MANAGEMENT ***********************************************/
/*
 * Return a valid dictionary_t pointer for use with dictionary initialization
 * or decompression
 */
dictionary_t* create_dictionary(void);
 
/*
 * Parse a provided dictionary blob for use in decompression
 * `src` -- must point to memory space representing the dictionary
 * `src_len` -- must provide the dictionary size
 * `dict` -- will contain the parsed contents of the dictionary and
 *        can be used for decompression
 */
void parse_dictionary(dictionary_t *const dict, const void *src,
                             size_t src_len);
 
/*
 * Free internal Huffman tables, FSE tables, and dictionary content
 */
void free_dictionary(dictionary_t *const dict);
/******* END DICTIONARY MANAGEMENT *******************************************/