/** @file * IPRT - Compression. */ /* * Copyright (C) 2006-2007 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ #ifndef ___iprt_zip_h #define ___iprt_zip_h #include #include RT_C_DECLS_BEGIN /** @defgroup grp_rt_zip RTZip - Compression * @ingroup grp_rt * @{ */ /** * Callback function for consuming compressed data during compression. * * @returns iprt status code. * @param pvUser User argument. * @param pvBuf Compressed data. * @param cbBuf Size of the compressed data. */ typedef DECLCALLBACK(int) FNRTZIPOUT(void *pvUser, const void *pvBuf, size_t cbBuf); /** Pointer to FNRTZIPOUT() function. */ typedef FNRTZIPOUT *PFNRTZIPOUT; /** * Callback function for supplying compressed data during decompression. * * @returns iprt status code. * @param pvUser User argument. * @param pvBuf Where to store the compressed data. * @param cbBuf Size of the buffer. * @param pcbBuf Number of bytes actually stored in the buffer. */ typedef DECLCALLBACK(int) FNRTZIPIN(void *pvUser, void *pvBuf, size_t cbBuf, size_t *pcbBuf); /** Pointer to FNRTZIPIN() function. */ typedef FNRTZIPIN *PFNRTZIPIN; /** * Compression type. * (Be careful with these they are stored in files!) */ typedef enum RTZIPTYPE { /** Invalid. */ RTZIPTYPE_INVALID = 0, /** Choose best fitting one. */ RTZIPTYPE_AUTO, /** Store the data. */ RTZIPTYPE_STORE, /** Zlib compression the data. */ RTZIPTYPE_ZLIB, /** BZlib compress. */ RTZIPTYPE_BZLIB, /** libLZF compress. */ RTZIPTYPE_LZF, /** Lempel-Ziv-Jeff-Bonwick compression. */ RTZIPTYPE_LZJB, /** Lempel-Ziv-Oberhumer compression. */ RTZIPTYPE_LZO, /** End of valid the valid compression types. */ RTZIPTYPE_END } RTZIPTYPE; /** * Compression level. */ typedef enum RTZIPLEVEL { /** Store, don't compress. */ RTZIPLEVEL_STORE = 0, /** Fast compression. */ RTZIPLEVEL_FAST, /** Default compression. */ RTZIPLEVEL_DEFAULT, /** Maximal compression. */ RTZIPLEVEL_MAX } RTZIPLEVEL; /** * Create a stream compressor instance. * * @returns iprt status code. * @param ppZip Where to store the instance handle. * @param pvUser User argument which will be passed on to pfnOut and pfnIn. * @param pfnOut Callback for consuming output of compression. * @param enmType Type of compressor to create. * @param enmLevel Compression level. */ RTDECL(int) RTZipCompCreate(PRTZIPCOMP *ppZip, void *pvUser, PFNRTZIPOUT pfnOut, RTZIPTYPE enmType, RTZIPLEVEL enmLevel); /** * Compresses a chunk of memory. * * @returns iprt status code. * @param pZip The compressor instance. * @param pvBuf Pointer to buffer containing the bits to compress. * @param cbBuf Number of bytes to compress. */ RTDECL(int) RTZipCompress(PRTZIPCOMP pZip, const void *pvBuf, size_t cbBuf); /** * Finishes the compression. * This will flush all data and terminate the compression data stream. * * @returns iprt status code. * @param pZip The stream compressor instance. */ RTDECL(int) RTZipCompFinish(PRTZIPCOMP pZip); /** * Destroys the stream compressor instance. * * @returns iprt status code. * @param pZip The compressor instance. */ RTDECL(int) RTZipCompDestroy(PRTZIPCOMP pZip); /** * Create a stream decompressor instance. * * @returns iprt status code. * @param ppZip Where to store the instance handle. * @param pvUser User argument which will be passed on to pfnOut and pfnIn. * @param pfnIn Callback for producing input for decompression. */ RTDECL(int) RTZipDecompCreate(PRTZIPDECOMP *ppZip, void *pvUser, PFNRTZIPIN pfnIn); /** * Decompresses a chunk of memory. * * @returns iprt status code. * @param pZip The stream decompressor instance. * @param pvBuf Where to store the decompressed data. * @param cbBuf Number of bytes to produce. If pcbWritten is set * any number of bytes up to cbBuf might be returned. * @param pcbWritten Number of bytes actually written to the buffer. If NULL * cbBuf number of bytes must be written. */ RTDECL(int) RTZipDecompress(PRTZIPDECOMP pZip, void *pvBuf, size_t cbBuf, size_t *pcbWritten); /** * Destroys the stream decompressor instance. * * @returns iprt status code. * @param pZip The decompressor instance. */ RTDECL(int) RTZipDecompDestroy(PRTZIPDECOMP pZip); /** * Compress a chunk of memory into a block. * * @returns IPRT status code. * * @param enmType The compression type. * @param enmLevel The compression level. * @param fFlags Flags reserved for future extensions, MBZ. * @param pvSrc Pointer to the input block. * @param cbSrc Size of the input block. * @param pvDst Pointer to the output buffer. * @param cbDst The size of the output buffer. * @param pcbDstActual Where to return the compressed size. */ RTDECL(int) RTZipBlockCompress(RTZIPTYPE enmType, RTZIPLEVEL enmLevel, uint32_t fFlags, void const *pvSrc, size_t cbSrc, void *pvDst, size_t cbDst, size_t *pcbDstActual) RT_NO_THROW; /** * Decompress a block. * * @returns IPRT status code. * * @param enmType The compression type. * @param fFlags Flags reserved for future extensions, MBZ. * @param pvSrc Pointer to the input block. * @param cbSrc Size of the input block. * @param pcbSrcActual Where to return the compressed size. * @param pvDst Pointer to the output buffer. * @param cbDst The size of the output buffer. * @param pcbDstActual Where to return the decompressed size. */ RTDECL(int) RTZipBlockDecompress(RTZIPTYPE enmType, uint32_t fFlags, void const *pvSrc, size_t cbSrc, size_t *pcbSrcActual, void *pvDst, size_t cbDst, size_t *pcbDstActual) RT_NO_THROW; /** @} */ RT_C_DECLS_END #endif