git.sesse.net Git - bcachefs-tools-debian/blob - c_src/linux/zstd_decompress_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 /* Common symbols. zstd_compress must depend on zstd_decompress. */
  18
  19 unsigned int zstd_is_error(size_t code)
  20 {
  21         return ZSTD_isError(code);
  22 }
  23 EXPORT_SYMBOL(zstd_is_error);
  24
  25 zstd_error_code zstd_get_error_code(size_t code)
  26 {
  27         return ZSTD_getErrorCode(code);
  28 }
  29 EXPORT_SYMBOL(zstd_get_error_code);
  30
  31 const char *zstd_get_error_name(size_t code)
  32 {
  33         return ZSTD_getErrorName(code);
  34 }
  35 EXPORT_SYMBOL(zstd_get_error_name);
  36
  37 /* Decompression symbols. */
  38
  39 size_t zstd_dctx_workspace_bound(void)
  40 {
  41         return ZSTD_estimateDCtxSize();
  42 }
  43 EXPORT_SYMBOL(zstd_dctx_workspace_bound);
  44
  45 zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size)
  46 {
  47         if (workspace == NULL)
  48                 return NULL;
  49         return ZSTD_initStaticDCtx(workspace, workspace_size);
  50 }
  51 EXPORT_SYMBOL(zstd_init_dctx);
  52
  53 size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
  54         const void *src, size_t src_size)
  55 {
  56         return ZSTD_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
  57 }
  58 EXPORT_SYMBOL(zstd_decompress_dctx);
  59
  60 size_t zstd_dstream_workspace_bound(size_t max_window_size)
  61 {
  62         return ZSTD_estimateDStreamSize(max_window_size);
  63 }
  64 EXPORT_SYMBOL(zstd_dstream_workspace_bound);
  65
  66 zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
  67         size_t workspace_size)
  68 {
  69         if (workspace == NULL)
  70                 return NULL;
  71         (void)max_window_size;
  72         return ZSTD_initStaticDStream(workspace, workspace_size);
  73 }
  74 EXPORT_SYMBOL(zstd_init_dstream);
  75
  76 size_t zstd_reset_dstream(zstd_dstream *dstream)
  77 {
  78         return ZSTD_resetDStream(dstream);
  79 }
  80 EXPORT_SYMBOL(zstd_reset_dstream);
  81
  82 size_t zstd_decompress_stream(zstd_dstream *dstream, zstd_out_buffer *output,
  83         zstd_in_buffer *input)
  84 {
  85         return ZSTD_decompressStream(dstream, output, input);
  86 }
  87 EXPORT_SYMBOL(zstd_decompress_stream);
  88
  89 size_t zstd_find_frame_compressed_size(const void *src, size_t src_size)
  90 {
  91         return ZSTD_findFrameCompressedSize(src, src_size);
  92 }
  93 EXPORT_SYMBOL(zstd_find_frame_compressed_size);
  94
  95 size_t zstd_get_frame_header(zstd_frame_header *header, const void *src,
  96         size_t src_size)
  97 {
  98         return ZSTD_getFrameHeader(header, src, src_size);
  99 }
 100 EXPORT_SYMBOL(zstd_get_frame_header);
 101
 102 MODULE_LICENSE("Dual BSD/GPL");
 103 MODULE_DESCRIPTION("Zstd Decompressor");