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annotate contrib/python-zstandard/zstd/compress/zstdmt_compress.h @ 35320:d901a88891fe

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rebase: rerun a rebase on-disk if IMM merge conflicts arise Differential Revision: https://phab.mercurial-scm.org/D1249
author Phil Cohen <phillco@fb.com>
date Fri, 08 Dec 2017 12:14:38 -0800
parents c32454d69b85
children b1fb341d8a61
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1 /**
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2 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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3 * All rights reserved.
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4 *
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5 * This source code is licensed under the BSD-style license found in the
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6 * LICENSE file in the root directory of this source tree. An additional grant
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7 * of patent rights can be found in the PATENTS file in the same directory.
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8 */
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9
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10 #ifndef ZSTDMT_COMPRESS_H
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11 #define ZSTDMT_COMPRESS_H
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12
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13 #if defined (__cplusplus)
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14 extern "C" {
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15 #endif
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18 /* Note : All prototypes defined in this file shall be considered experimental.
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19 * There is no guarantee of API continuity (yet) on any of these prototypes */
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21 /* === Dependencies === */
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22 #include <stddef.h> /* size_t */
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23 #define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */
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24 #include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
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27 /* === Simple one-pass functions === */
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28
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29 typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
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30 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbThreads);
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31 ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* cctx);
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32
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33 ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* cctx,
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34 void* dst, size_t dstCapacity,
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35 const void* src, size_t srcSize,
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36 int compressionLevel);
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39 /* === Streaming functions === */
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40
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41 ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
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42 ZSTDLIB_API size_t ZSTDMT_resetCStream(ZSTDMT_CCtx* mtctx, unsigned long long pledgedSrcSize); /**< pledgedSrcSize is optional and can be zero == unknown */
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43
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44 ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
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45
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46 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()) */
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47 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()) */
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49
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50 /* === Advanced functions and parameters === */
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51
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52 #ifndef ZSTDMT_SECTION_SIZE_MIN
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53 # define ZSTDMT_SECTION_SIZE_MIN (1U << 20) /* 1 MB - Minimum size of each compression job */
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54 #endif
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55
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56 ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx, const void* dict, size_t dictSize, /**< dict can be released after init, a local copy is preserved within zcs */
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57 ZSTD_parameters params, unsigned long long pledgedSrcSize); /**< pledgedSrcSize is optional and can be zero == unknown */
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58
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59 /* ZSDTMT_parameter :
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60 * List of parameters that can be set using ZSTDMT_setMTCtxParameter() */
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61 typedef enum {
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62 ZSTDMT_p_sectionSize, /* size of input "section". Each section is compressed in parallel. 0 means default, which is dynamically determined within compression functions */
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63 ZSTDMT_p_overlapSectionLog /* Log of overlapped section; 0 == no overlap, 6(default) == use 1/8th of window, >=9 == use full window */
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64 } ZSDTMT_parameter;
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65
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66 /* ZSTDMT_setMTCtxParameter() :
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67 * allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter.
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68 * The function must be called typically after ZSTD_createCCtx().
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69 * Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions.
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70 * @return : 0, or an error code (which can be tested using ZSTD_isError()) */
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71 ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSDTMT_parameter parameter, unsigned value);
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72
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74 #if defined (__cplusplus)
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75 }
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76 #endif
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77
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78 #endif /* ZSTDMT_COMPRESS_H */