| /** |
| * Copyright (c) 2016-present, Przemyslaw Skibinski, Facebook, Inc. |
| * All rights reserved. |
| * |
| * This source code is licensed under the BSD-style license found in the |
| * LICENSE file in the root directory of this source tree. An additional grant |
| * of patent rights can be found in the PATENTS file in the same directory. |
| */ |
| |
| #ifndef ZSTD_ZLIBWRAPPER_H |
| #define ZSTD_ZLIBWRAPPER_H |
| |
| #if defined (__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| #define ZLIB_CONST |
| #define Z_PREFIX |
| #include <zlib.h> |
| |
| #if !defined(z_const) |
| #define z_const |
| #endif |
| |
| |
| /* returns a string with version of zstd library */ |
| const char * zstdVersion(void); |
| |
| |
| /*** COMPRESSION ***/ |
| /* enables/disables zstd compression during runtime */ |
| void ZWRAP_useZSTDcompression(int turn_on); |
| |
| /* checks if zstd compression is turned on */ |
| int ZWRAP_isUsingZSTDcompression(void); |
| |
| /* Changes a pledged source size for a given compression stream. |
| It will change ZSTD compression parameters what may improve compression speed and/or ratio. |
| The function should be called just after deflateInit() or deflateReset() and before deflate() or deflateSetDictionary(). |
| It's only helpful when data is compressed in blocks. |
| There will be no change in case of deflateInit() or deflateReset() immediately followed by deflate(strm, Z_FINISH) |
| as this case is automatically detected. */ |
| int ZWRAP_setPledgedSrcSize(z_streamp strm, unsigned long long pledgedSrcSize); |
| |
| /* Similar to deflateReset but preserves dictionary set using deflateSetDictionary. |
| It should improve compression speed because there will be less calls to deflateSetDictionary |
| When using zlib compression this method redirects to deflateReset. */ |
| int ZWRAP_deflateReset_keepDict(z_streamp strm); |
| |
| |
| |
| /*** DECOMPRESSION ***/ |
| typedef enum { ZWRAP_FORCE_ZLIB, ZWRAP_AUTO } ZWRAP_decompress_type; |
| |
| /* enables/disables automatic recognition of zstd/zlib compressed data during runtime */ |
| void ZWRAP_setDecompressionType(ZWRAP_decompress_type type); |
| |
| /* checks zstd decompression type */ |
| ZWRAP_decompress_type ZWRAP_getDecompressionType(void); |
| |
| /* Checks if zstd decompression is used for a given stream. |
| If will return 1 only when inflate() was called and zstd header was detected. */ |
| int ZWRAP_isUsingZSTDdecompression(z_streamp strm); |
| |
| /* Similar to inflateReset but preserves dictionary set using inflateSetDictionary. |
| inflate() will return Z_NEED_DICT only for the first time what will improve decompression speed. |
| For zlib streams this method redirects to inflateReset. */ |
| int ZWRAP_inflateReset_keepDict(z_streamp strm); |
| |
| |
| #if defined (__cplusplus) |
| } |
| #endif |
| |
| #endif /* ZSTD_ZLIBWRAPPER_H */ |