lib/zstd/zstd_compress_module.c

   1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
   2 /*
   3  * Copyright (c) Facebook, Inc.
   4  * All rights reserved.
   5  *
   6  * This source code is licensed under both the BSD-style license (found in the
   7  * LICENSE file in the root directory of this source tree) and the GPLv2 (found
   8  * in the COPYING file in the root directory of this source tree).
   9  * You may select, at your option, one of the above-listed licenses.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/zstd.h>
  16
  17 #include "common/zstd_deps.h"
  18 #include "common/zstd_internal.h"
  19
  20 #define ZSTD_FORWARD_IF_ERR(ret)            \
  21         do {                                \
  22                 size_t const __ret = (ret); \
  23                 if (ZSTD_isError(__ret))    \
  24                         return __ret;       \
  25         } while (0)
  26
  27 static size_t zstd_cctx_init(zstd_cctx *cctx, const zstd_parameters *parameters,
  28         unsigned long long pledged_src_size)
  29 {
  30         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_reset(
  31                 cctx, ZSTD_reset_session_and_parameters));
  32         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setPledgedSrcSize(
  33                 cctx, pledged_src_size));
  34         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  35                 cctx, ZSTD_c_windowLog, parameters->cParams.windowLog));
  36         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  37                 cctx, ZSTD_c_hashLog, parameters->cParams.hashLog));
  38         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  39                 cctx, ZSTD_c_chainLog, parameters->cParams.chainLog));
  40         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  41                 cctx, ZSTD_c_searchLog, parameters->cParams.searchLog));
  42         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  43                 cctx, ZSTD_c_minMatch, parameters->cParams.minMatch));
  44         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  45                 cctx, ZSTD_c_targetLength, parameters->cParams.targetLength));
  46         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  47                 cctx, ZSTD_c_strategy, parameters->cParams.strategy));
  48         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  49                 cctx, ZSTD_c_contentSizeFlag, parameters->fParams.contentSizeFlag));
  50         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  51                 cctx, ZSTD_c_checksumFlag, parameters->fParams.checksumFlag));
  52         ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
  53                 cctx, ZSTD_c_dictIDFlag, !parameters->fParams.noDictIDFlag));
  54         return 0;
  55 }
  56
  57 int zstd_min_clevel(void)
  58 {
  59         return ZSTD_minCLevel();
  60 }
  61 EXPORT_SYMBOL(zstd_min_clevel);
  62
  63 int zstd_max_clevel(void)
  64 {
  65         return ZSTD_maxCLevel();
  66 }
  67 EXPORT_SYMBOL(zstd_max_clevel);
  68
  69 int zstd_default_clevel(void)
  70 {
  71         return ZSTD_defaultCLevel();
  72 }
  73 EXPORT_SYMBOL(zstd_default_clevel);
  74
  75 size_t zstd_compress_bound(size_t src_size)
  76 {
  77         return ZSTD_compressBound(src_size);
  78 }
  79 EXPORT_SYMBOL(zstd_compress_bound);
  80
  81 zstd_parameters zstd_get_params(int level,
  82         unsigned long long estimated_src_size)
  83 {
  84         return ZSTD_getParams(level, estimated_src_size, 0);
  85 }
  86 EXPORT_SYMBOL(zstd_get_params);
  87
  88 zstd_compression_parameters zstd_get_cparams(int level,
  89         unsigned long long estimated_src_size, size_t dict_size)
  90 {
  91         return ZSTD_getCParams(level, estimated_src_size, dict_size);
  92 }
  93 EXPORT_SYMBOL(zstd_get_cparams);
  94
  95 size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *cparams)
  96 {
  97         return ZSTD_estimateCCtxSize_usingCParams(*cparams);
  98 }
  99 EXPORT_SYMBOL(zstd_cctx_workspace_bound);
 100
 101 zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size)
 102 {
 103         if (workspace == NULL)
 104                 return NULL;
 105         return ZSTD_initStaticCCtx(workspace, workspace_size);
 106 }
 107 EXPORT_SYMBOL(zstd_init_cctx);
 108
 109 zstd_cctx *zstd_create_cctx_advanced(zstd_custom_mem custom_mem)
 110 {
 111         return ZSTD_createCCtx_advanced(custom_mem);
 112 }
 113 EXPORT_SYMBOL(zstd_create_cctx_advanced);
 114
 115 size_t zstd_free_cctx(zstd_cctx *cctx)
 116 {
 117         return ZSTD_freeCCtx(cctx);
 118 }
 119 EXPORT_SYMBOL(zstd_free_cctx);
 120
 121 zstd_cdict *zstd_create_cdict_byreference(const void *dict, size_t dict_size,
 122                                           zstd_compression_parameters cparams,
 123                                           zstd_custom_mem custom_mem)
 124 {
 125         return ZSTD_createCDict_advanced(dict, dict_size, ZSTD_dlm_byRef,
 126                                          ZSTD_dct_auto, cparams, custom_mem);
 127 }
 128 EXPORT_SYMBOL(zstd_create_cdict_byreference);
 129
 130 size_t zstd_free_cdict(zstd_cdict *cdict)
 131 {
 132         return ZSTD_freeCDict(cdict);
 133 }
 134 EXPORT_SYMBOL(zstd_free_cdict);
 135
 136 size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
 137         const void *src, size_t src_size, const zstd_parameters *parameters)
 138 {
 139         ZSTD_FORWARD_IF_ERR(zstd_cctx_init(cctx, parameters, src_size));
 140         return ZSTD_compress2(cctx, dst, dst_capacity, src, src_size);
 141 }
 142 EXPORT_SYMBOL(zstd_compress_cctx);
 143
 144 size_t zstd_compress_using_cdict(zstd_cctx *cctx, void *dst,
 145         size_t dst_capacity, const void *src, size_t src_size,
 146         const ZSTD_CDict *cdict)
 147 {
 148         return ZSTD_compress_usingCDict(cctx, dst, dst_capacity,
 149                                         src, src_size, cdict);
 150 }
 151 EXPORT_SYMBOL(zstd_compress_using_cdict);
 152
 153 size_t zstd_cstream_workspace_bound(const zstd_compression_parameters *cparams)
 154 {
 155         return ZSTD_estimateCStreamSize_usingCParams(*cparams);
 156 }
 157 EXPORT_SYMBOL(zstd_cstream_workspace_bound);
 158
 159 zstd_cstream *zstd_init_cstream(const zstd_parameters *parameters,
 160         unsigned long long pledged_src_size, void *workspace, size_t workspace_size)
 161 {
 162         zstd_cstream *cstream;
 163
 164         if (workspace == NULL)
 165                 return NULL;
 166
 167         cstream = ZSTD_initStaticCStream(workspace, workspace_size);
 168         if (cstream == NULL)
 169                 return NULL;
 170
 171         /* 0 means unknown in linux zstd API but means 0 in new zstd API */
 172         if (pledged_src_size == 0)
 173                 pledged_src_size = ZSTD_CONTENTSIZE_UNKNOWN;
 174
 175         if (ZSTD_isError(zstd_cctx_init(cstream, parameters, pledged_src_size)))
 176                 return NULL;
 177
 178         return cstream;
 179 }
 180 EXPORT_SYMBOL(zstd_init_cstream);
 181
 182 size_t zstd_reset_cstream(zstd_cstream *cstream,
 183         unsigned long long pledged_src_size)
 184 {
 185         if (pledged_src_size == 0)
 186                 pledged_src_size = ZSTD_CONTENTSIZE_UNKNOWN;
 187         ZSTD_FORWARD_IF_ERR( ZSTD_CCtx_reset(cstream, ZSTD_reset_session_only) );
 188         ZSTD_FORWARD_IF_ERR( ZSTD_CCtx_setPledgedSrcSize(cstream, pledged_src_size) );
 189         return 0;
 190 }
 191 EXPORT_SYMBOL(zstd_reset_cstream);
 192
 193 size_t zstd_compress_stream(zstd_cstream *cstream, zstd_out_buffer *output,
 194         zstd_in_buffer *input)
 195 {
 196         return ZSTD_compressStream(cstream, output, input);
 197 }
 198 EXPORT_SYMBOL(zstd_compress_stream);
 199
 200 size_t zstd_flush_stream(zstd_cstream *cstream, zstd_out_buffer *output)
 201 {
 202         return ZSTD_flushStream(cstream, output);
 203 }
 204 EXPORT_SYMBOL(zstd_flush_stream);
 205
 206 size_t zstd_end_stream(zstd_cstream *cstream, zstd_out_buffer *output)
 207 {
 208         return ZSTD_endStream(cstream, output);
 209 }
 210 EXPORT_SYMBOL(zstd_end_stream);
 211
 212 MODULE_LICENSE("Dual BSD/GPL");
 213 MODULE_DESCRIPTION("Zstd Compressor");