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