deps/libchdr/deps/zstd-1.5.5/contrib/linux-kernel/zstd_decompress_module.c

   1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
   2 /*
   3  * Copyright (c) Meta Platforms, Inc. and affiliates.
   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 #include "common/zstd_deps.h"
  18
  19 /* Common symbols. zstd_compress must depend on zstd_decompress. */
  20
  21 unsigned int zstd_is_error(size_t code)
  22 {
  23         return ZSTD_isError(code);
  24 }
  25 EXPORT_SYMBOL(zstd_is_error);
  26
  27 zstd_error_code zstd_get_error_code(size_t code)
  28 {
  29         return ZSTD_getErrorCode(code);
  30 }
  31 EXPORT_SYMBOL(zstd_get_error_code);
  32
  33 const char *zstd_get_error_name(size_t code)
  34 {
  35         return ZSTD_getErrorName(code);
  36 }
  37 EXPORT_SYMBOL(zstd_get_error_name);
  38
  39 /* Decompression symbols. */
  40
  41 size_t zstd_dctx_workspace_bound(void)
  42 {
  43         return ZSTD_estimateDCtxSize();
  44 }
  45 EXPORT_SYMBOL(zstd_dctx_workspace_bound);
  46
  47 zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size)
  48 {
  49         if (workspace == NULL)
  50                 return NULL;
  51         return ZSTD_initStaticDCtx(workspace, workspace_size);
  52 }
  53 EXPORT_SYMBOL(zstd_init_dctx);
  54
  55 size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
  56         const void *src, size_t src_size)
  57 {
  58         return ZSTD_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
  59 }
  60 EXPORT_SYMBOL(zstd_decompress_dctx);
  61
  62 size_t zstd_dstream_workspace_bound(size_t max_window_size)
  63 {
  64         return ZSTD_estimateDStreamSize(max_window_size);
  65 }
  66 EXPORT_SYMBOL(zstd_dstream_workspace_bound);
  67
  68 zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
  69         size_t workspace_size)
  70 {
  71         if (workspace == NULL)
  72                 return NULL;
  73         (void)max_window_size;
  74         return ZSTD_initStaticDStream(workspace, workspace_size);
  75 }
  76 EXPORT_SYMBOL(zstd_init_dstream);
  77
  78 size_t zstd_reset_dstream(zstd_dstream *dstream)
  79 {
  80         return ZSTD_resetDStream(dstream);
  81 }
  82 EXPORT_SYMBOL(zstd_reset_dstream);
  83
  84 size_t zstd_decompress_stream(zstd_dstream *dstream, zstd_out_buffer *output,
  85         zstd_in_buffer *input)
  86 {
  87         return ZSTD_decompressStream(dstream, output, input);
  88 }
  89 EXPORT_SYMBOL(zstd_decompress_stream);
  90
  91 size_t zstd_find_frame_compressed_size(const void *src, size_t src_size)
  92 {
  93         return ZSTD_findFrameCompressedSize(src, src_size);
  94 }
  95 EXPORT_SYMBOL(zstd_find_frame_compressed_size);
  96
  97 size_t zstd_get_frame_header(zstd_frame_header *header, const void *src,
  98         size_t src_size)
  99 {
 100         return ZSTD_getFrameHeader(header, src, src_size);
 101 }
 102 EXPORT_SYMBOL(zstd_get_frame_header);
 103
 104 MODULE_LICENSE("Dual BSD/GPL");
 105 MODULE_DESCRIPTION("Zstd Decompressor");