2 * Copyright (c) Meta Platforms, Inc. and affiliates.
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.
11 #ifndef ZSTDMT_COMPRESS_H
12 #define ZSTDMT_COMPRESS_H
14 #if defined (__cplusplus)
19 /* Note : This is an internal API.
20 * These APIs used to be exposed with ZSTDLIB_API,
21 * because it used to be the only way to invoke MT compression.
22 * Now, you must use ZSTD_compress2 and ZSTD_compressStream2() instead.
24 * This API requires ZSTD_MULTITHREAD to be defined during compilation,
25 * otherwise ZSTDMT_createCCtx*() will fail.
28 /* === Dependencies === */
29 #include "../common/zstd_deps.h" /* size_t */
30 #define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */
31 #include "../zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
34 /* === Constants === */
35 #ifndef ZSTDMT_NBWORKERS_MAX /* a different value can be selected at compile time */
36 # define ZSTDMT_NBWORKERS_MAX ((sizeof(void*)==4) /*32-bit*/ ? 64 : 256)
38 #ifndef ZSTDMT_JOBSIZE_MIN /* a different value can be selected at compile time */
39 # define ZSTDMT_JOBSIZE_MIN (512 KB)
41 #define ZSTDMT_JOBLOG_MAX (MEM_32bits() ? 29 : 30)
42 #define ZSTDMT_JOBSIZE_MAX (MEM_32bits() ? (512 MB) : (1024 MB))
45 /* ========================================================
46 * === Private interface, for use by ZSTD_compress.c ===
47 * === Not exposed in libzstd. Never invoke directly ===
48 * ======================================================== */
50 /* === Memory management === */
51 typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
52 /* Requires ZSTD_MULTITHREAD to be defined during compilation, otherwise it will return NULL. */
53 ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers,
55 ZSTD_threadPool *pool);
56 size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
58 size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
60 /* === Streaming functions === */
62 size_t ZSTDMT_nextInputSizeHint(const ZSTDMT_CCtx* mtctx);
64 /*! ZSTDMT_initCStream_internal() :
65 * Private use only. Init streaming operation.
66 * expects params to be valid.
67 * must receive dict, or cdict, or none, but not both.
68 * mtctx can be freshly constructed or reused from a prior compression.
69 * If mtctx is reused, memory allocations from the prior compression may not be freed,
70 * even if they are not needed for the current compression.
71 * @return : 0, or an error code */
72 size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* mtctx,
73 const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType,
74 const ZSTD_CDict* cdict,
75 ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
77 /*! ZSTDMT_compressStream_generic() :
78 * Combines ZSTDMT_compressStream() with optional ZSTDMT_flushStream() or ZSTDMT_endStream()
79 * depending on flush directive.
80 * @return : minimum amount of data still to be flushed
83 * note : needs to be init using any ZSTD_initCStream*() variant */
84 size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
85 ZSTD_outBuffer* output,
87 ZSTD_EndDirective endOp);
89 /*! ZSTDMT_toFlushNow()
90 * Tell how many bytes are ready to be flushed immediately.
91 * Probe the oldest active job (not yet entirely flushed) and check its output buffer.
92 * If return 0, it means there is no active job,
93 * or, it means oldest job is still active, but everything produced has been flushed so far,
94 * therefore flushing is limited by speed of oldest job. */
95 size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx);
97 /*! ZSTDMT_updateCParams_whileCompressing() :
98 * Updates only a selected set of compression parameters, to remain compatible with current frame.
99 * New parameters will be applied to next compression job. */
100 void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams);
102 /*! ZSTDMT_getFrameProgression():
103 * tells how much data has been consumed (input) and produced (output) for current frame.
104 * able to count progression inside worker threads.
106 ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx);
109 #if defined (__cplusplus)
113 #endif /* ZSTDMT_COMPRESS_H */