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https://github.com/facebook/zstd.git
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123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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 "zstd.h"
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#include "common/zstd_deps.h"
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#include "common/zstd_errors.h"
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/* Common symbols. zstd_compress must depend on zstd_decompress. */
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unsigned int zstd_is_error(size_t code)
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{
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return ZSTD_isError(code);
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}
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EXPORT_SYMBOL(zstd_is_error);
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int zstd_get_error_code(size_t code)
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{
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return ZSTD_getErrorCode(code);
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}
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EXPORT_SYMBOL(zstd_get_error_code);
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const char *zstd_get_error_name(size_t code)
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{
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return ZSTD_getErrorName(code);
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}
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EXPORT_SYMBOL(zstd_get_error_name);
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/* Decompression symbols. */
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size_t zstd_dctx_workspace_bound(void)
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{
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return ZSTD_estimateDCtxSize();
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}
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EXPORT_SYMBOL(zstd_dctx_workspace_bound);
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zstd_dctx *zstd_init_dctx(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_initStaticDCtx(workspace, workspace_size);
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}
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EXPORT_SYMBOL(zstd_init_dctx);
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size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
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const void *src, size_t src_size)
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{
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return ZSTD_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
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}
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EXPORT_SYMBOL(zstd_decompress_dctx);
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size_t zstd_dstream_workspace_bound(size_t max_window_size)
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{
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return ZSTD_estimateDStreamSize(max_window_size);
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}
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EXPORT_SYMBOL(zstd_dstream_workspace_bound);
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zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
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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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(void)max_window_size;
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return ZSTD_initStaticDStream(workspace, workspace_size);
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}
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EXPORT_SYMBOL(zstd_init_dstream);
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size_t zstd_reset_dstream(zstd_dstream *dstream)
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{
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return ZSTD_resetDStream(dstream);
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}
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EXPORT_SYMBOL(zstd_reset_dstream);
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size_t zstd_decompress_stream(zstd_dstream *dstream,
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struct zstd_out_buffer *output, struct zstd_in_buffer *input)
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{
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ZSTD_outBuffer o;
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ZSTD_inBuffer i;
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size_t ret;
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ZSTD_memcpy(&o, output, sizeof(o));
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ZSTD_memcpy(&i, input, sizeof(i));
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ret = ZSTD_decompressStream(dstream, &o, &i);
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ZSTD_memcpy(output, &o, sizeof(o));
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ZSTD_memcpy(input, &i, sizeof(i));
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return ret;
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}
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EXPORT_SYMBOL(zstd_decompress_stream);
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size_t zstd_find_frame_compressed_size(const void *src, size_t src_size)
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{
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return ZSTD_findFrameCompressedSize(src, src_size);
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}
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EXPORT_SYMBOL(zstd_find_frame_compressed_size);
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size_t zstd_get_frame_params(struct zstd_frame_params *params, const void *src,
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size_t src_size)
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{
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ZSTD_frameHeader h;
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const size_t ret = ZSTD_getFrameHeader(&h, src, src_size);
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if (ret != 0)
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return ret;
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if (h.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN)
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params->frame_content_size = h.frameContentSize;
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else
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params->frame_content_size = 0;
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params->window_size = h.windowSize;
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params->dict_id = h.dictID;
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params->checksum_flag = h.checksumFlag;
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return ret;
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}
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EXPORT_SYMBOL(zstd_get_frame_params);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_DESCRIPTION("Zstd Decompressor");
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