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Diffstat (limited to 'lib/zstd/zstd_compress_module.c')
| -rw-r--r-- | lib/zstd/zstd_compress_module.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/lib/zstd/zstd_compress_module.c b/lib/zstd/zstd_compress_module.c new file mode 100644 index 000000000000..04e1b5c01d9b --- /dev/null +++ b/lib/zstd/zstd_compress_module.c @@ -0,0 +1,164 @@ +// 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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