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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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161 lines
4.7 KiB
C
161 lines
4.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (c) Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/zstd.h>
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#include "common/zstd_deps.h"
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#include "common/zstd_internal.h"
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#define ZSTD_FORWARD_IF_ERR(ret) \
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do { \
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size_t const __ret = (ret); \
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if (ZSTD_isError(__ret)) \
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return __ret; \
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} while (0)
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static size_t zstd_cctx_init(zstd_cctx *cctx, const zstd_parameters *parameters,
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unsigned long long pledged_src_size)
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{
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_reset(
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cctx, ZSTD_reset_session_and_parameters));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setPledgedSrcSize(
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cctx, pledged_src_size));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_windowLog, parameters->cParams.windowLog));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_hashLog, parameters->cParams.hashLog));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_chainLog, parameters->cParams.chainLog));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_searchLog, parameters->cParams.searchLog));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_minMatch, parameters->cParams.minMatch));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_targetLength, parameters->cParams.targetLength));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_strategy, parameters->cParams.strategy));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_contentSizeFlag, parameters->fParams.contentSizeFlag));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_checksumFlag, parameters->fParams.checksumFlag));
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ZSTD_FORWARD_IF_ERR(ZSTD_CCtx_setParameter(
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cctx, ZSTD_c_dictIDFlag, !parameters->fParams.noDictIDFlag));
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return 0;
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}
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int zstd_min_clevel(void)
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{
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return ZSTD_minCLevel();
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}
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EXPORT_SYMBOL(zstd_min_clevel);
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int zstd_max_clevel(void)
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{
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return ZSTD_maxCLevel();
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}
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EXPORT_SYMBOL(zstd_max_clevel);
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size_t zstd_compress_bound(size_t src_size)
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{
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return ZSTD_compressBound(src_size);
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}
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EXPORT_SYMBOL(zstd_compress_bound);
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zstd_parameters zstd_get_params(int level,
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unsigned long long estimated_src_size)
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{
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return ZSTD_getParams(level, estimated_src_size, 0);
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}
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EXPORT_SYMBOL(zstd_get_params);
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size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *cparams)
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{
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return ZSTD_estimateCCtxSize_usingCParams(*cparams);
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}
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EXPORT_SYMBOL(zstd_cctx_workspace_bound);
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zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size)
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{
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if (workspace == NULL)
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return NULL;
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return ZSTD_initStaticCCtx(workspace, workspace_size);
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}
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EXPORT_SYMBOL(zstd_init_cctx);
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size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
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const void *src, size_t src_size, const zstd_parameters *parameters)
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{
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ZSTD_FORWARD_IF_ERR(zstd_cctx_init(cctx, parameters, src_size));
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return ZSTD_compress2(cctx, dst, dst_capacity, src, src_size);
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}
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EXPORT_SYMBOL(zstd_compress_cctx);
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size_t zstd_cstream_workspace_bound(const zstd_compression_parameters *cparams)
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{
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return ZSTD_estimateCStreamSize_usingCParams(*cparams);
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}
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EXPORT_SYMBOL(zstd_cstream_workspace_bound);
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zstd_cstream *zstd_init_cstream(const zstd_parameters *parameters,
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unsigned long long pledged_src_size, void *workspace, size_t workspace_size)
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{
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zstd_cstream *cstream;
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if (workspace == NULL)
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return NULL;
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cstream = ZSTD_initStaticCStream(workspace, workspace_size);
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if (cstream == NULL)
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return NULL;
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/* 0 means unknown in linux zstd API but means 0 in new zstd API */
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if (pledged_src_size == 0)
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pledged_src_size = ZSTD_CONTENTSIZE_UNKNOWN;
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if (ZSTD_isError(zstd_cctx_init(cstream, parameters, pledged_src_size)))
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return NULL;
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return cstream;
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}
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EXPORT_SYMBOL(zstd_init_cstream);
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size_t zstd_reset_cstream(zstd_cstream *cstream,
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unsigned long long pledged_src_size)
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{
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return ZSTD_resetCStream(cstream, pledged_src_size);
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}
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EXPORT_SYMBOL(zstd_reset_cstream);
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size_t zstd_compress_stream(zstd_cstream *cstream, zstd_out_buffer *output,
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zstd_in_buffer *input)
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{
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return ZSTD_compressStream(cstream, output, input);
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}
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EXPORT_SYMBOL(zstd_compress_stream);
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size_t zstd_flush_stream(zstd_cstream *cstream, zstd_out_buffer *output)
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{
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return ZSTD_flushStream(cstream, output);
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}
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EXPORT_SYMBOL(zstd_flush_stream);
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size_t zstd_end_stream(zstd_cstream *cstream, zstd_out_buffer *output)
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{
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return ZSTD_endStream(cstream, output);
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}
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EXPORT_SYMBOL(zstd_end_stream);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_DESCRIPTION("Zstd Compressor");
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