ceph/src/zstd/lib/compress/zstdmt_compress.h

   1 /*
   2  * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
   3  * All rights reserved.
   4  *
   5  * This source code is licensed under both the BSD-style license (found in the
   6  * LICENSE file in the root directory of this source tree) and the GPLv2 (found
   7  * in the COPYING file in the root directory of this source tree).
   8  * You may select, at your option, one of the above-listed licenses.
   9  */
  10
  11  #ifndef ZSTDMT_COMPRESS_H
  12  #define ZSTDMT_COMPRESS_H
  13
  14  #if defined (__cplusplus)
  15  extern "C" {
  16  #endif
  17
  18
  19 /* Note : This is an internal API.
  20  *        Some methods are still exposed (ZSTDLIB_API),
  21  *        because it used to be the only way to invoke MT compression.
  22  *        Now, it's recommended to use ZSTD_compress_generic() instead.
  23  *        These methods will stop being exposed in a future version */
  24
  25 /* ===   Dependencies   === */
  26 #include <stddef.h>                /* size_t */
  27 #define ZSTD_STATIC_LINKING_ONLY   /* ZSTD_parameters */
  28 #include "zstd.h"            /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
  29
  30
  31 /* ===   Memory management   === */
  32 typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
  33 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbThreads);
  34 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbThreads,
  35                                                     ZSTD_customMem cMem);
  36 ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
  37
  38 ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
  39
  40
  41 /* ===   Simple buffer-to-butter one-pass function   === */
  42
  43 ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,
  44                                        void* dst, size_t dstCapacity,
  45                                  const void* src, size_t srcSize,
  46                                        int compressionLevel);
  47
  48
  49
  50 /* ===   Streaming functions   === */
  51
  52 ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
  53 ZSTDLIB_API size_t ZSTDMT_resetCStream(ZSTDMT_CCtx* mtctx, unsigned long long pledgedSrcSize);    /**< pledgedSrcSize is optional and can be zero == unknown */
  54
  55 ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
  56
  57 ZSTDLIB_API size_t ZSTDMT_flushStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output);   /**< @return : 0 == all flushed; >0 : still some data to be flushed; or an error code (ZSTD_isError()) */
  58 ZSTDLIB_API size_t ZSTDMT_endStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output);     /**< @return : 0 == all flushed; >0 : still some data to be flushed; or an error code (ZSTD_isError()) */
  59
  60
  61 /* ===   Advanced functions and parameters  === */
  62
  63 #ifndef ZSTDMT_SECTION_SIZE_MIN
  64 #  define ZSTDMT_SECTION_SIZE_MIN (1U << 20)   /* 1 MB - Minimum size of each compression job */
  65 #endif
  66
  67 ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,
  68                                            void* dst, size_t dstCapacity,
  69                                      const void* src, size_t srcSize,
  70                                      const ZSTD_CDict* cdict,
  71                                            ZSTD_parameters const params,
  72                                            unsigned overlapLog);
  73
  74 ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx,
  75                                         const void* dict, size_t dictSize,   /* dict can be released after init, a local copy is preserved within zcs */
  76                                         ZSTD_parameters params,
  77                                         unsigned long long pledgedSrcSize);  /* pledgedSrcSize is optional and can be zero == unknown */
  78
  79 ZSTDLIB_API size_t ZSTDMT_initCStream_usingCDict(ZSTDMT_CCtx* mtctx,
  80                                         const ZSTD_CDict* cdict,
  81                                         ZSTD_frameParameters fparams,
  82                                         unsigned long long pledgedSrcSize);  /* note : zero means empty */
  83
  84 /* ZSTDMT_parameter :
  85  * List of parameters that can be set using ZSTDMT_setMTCtxParameter() */
  86 typedef enum {
  87     ZSTDMT_p_sectionSize,        /* size of input "section". Each section is compressed in parallel. 0 means default, which is dynamically determined within compression functions */
  88     ZSTDMT_p_overlapSectionLog   /* Log of overlapped section; 0 == no overlap, 6(default) == use 1/8th of window, >=9 == use full window */
  89 } ZSTDMT_parameter;
  90
  91 /* ZSTDMT_setMTCtxParameter() :
  92  * allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter.
  93  * The function must be called typically after ZSTD_createCCtx().
  94  * Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions.
  95  * @return : 0, or an error code (which can be tested using ZSTD_isError()) */
  96 ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned value);
  97
  98
  99 /*! ZSTDMT_compressStream_generic() :
 100  *  Combines ZSTDMT_compressStream() with ZSTDMT_flushStream() or ZSTDMT_endStream()
 101  *  depending on flush directive.
 102  * @return : minimum amount of data still to be flushed
 103  *           0 if fully flushed
 104  *           or an error code */
 105 ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
 106                                                 ZSTD_outBuffer* output,
 107                                                 ZSTD_inBuffer* input,
 108                                                 ZSTD_EndDirective endOp);
 109
 110
 111 /* ===   Private definitions; never ever use directly  === */
 112
 113 size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, unsigned value);
 114
 115 size_t ZSTDMT_initializeCCtxParameters(ZSTD_CCtx_params* params, unsigned nbThreads);
 116
 117 /*! ZSTDMT_initCStream_internal() :
 118  *  Private use only. Init streaming operation.
 119  *  expects params to be valid.
 120  *  must receive dict, or cdict, or none, but not both.
 121  *  @return : 0, or an error code */
 122 size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs,
 123                     const void* dict, size_t dictSize, ZSTD_dictMode_e dictMode,
 124                     const ZSTD_CDict* cdict,
 125                     ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
 126
 127
 128 #if defined (__cplusplus)
 129 }
 130 #endif
 131
 132 #endif   /* ZSTDMT_COMPRESS_H */