lib/zstd/zstd_decompress_module.c

Source file repositories/reference/linux-study-clean/lib/zstd/zstd_decompress_module.c

File Facts

System
Linux kernel
Corpus path
lib/zstd/zstd_decompress_module.c
Extension
.c
Size
3682 bytes
Lines
142
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * 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"

/* Common symbols. zstd_compress must depend on zstd_decompress. */

unsigned int zstd_is_error(size_t code)
{
	return ZSTD_isError(code);
}
EXPORT_SYMBOL(zstd_is_error);

zstd_error_code zstd_get_error_code(size_t code)
{
	return ZSTD_getErrorCode(code);
}
EXPORT_SYMBOL(zstd_get_error_code);

const char *zstd_get_error_name(size_t code)
{
	return ZSTD_getErrorName(code);
}
EXPORT_SYMBOL(zstd_get_error_name);

/* Decompression symbols. */

size_t zstd_dctx_workspace_bound(void)
{
	return ZSTD_estimateDCtxSize();
}
EXPORT_SYMBOL(zstd_dctx_workspace_bound);

zstd_dctx *zstd_create_dctx_advanced(zstd_custom_mem custom_mem)
{
	return ZSTD_createDCtx_advanced(custom_mem);
}
EXPORT_SYMBOL(zstd_create_dctx_advanced);

size_t zstd_free_dctx(zstd_dctx *dctx)
{
	return ZSTD_freeDCtx(dctx);
}
EXPORT_SYMBOL(zstd_free_dctx);

zstd_ddict *zstd_create_ddict_byreference(const void *dict, size_t dict_size,
					  zstd_custom_mem custom_mem)
{
	return ZSTD_createDDict_advanced(dict, dict_size, ZSTD_dlm_byRef,
					 ZSTD_dct_auto, custom_mem);

}
EXPORT_SYMBOL(zstd_create_ddict_byreference);

size_t zstd_free_ddict(zstd_ddict *ddict)
{
	return ZSTD_freeDDict(ddict);
}
EXPORT_SYMBOL(zstd_free_ddict);

zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size)
{
	if (workspace == NULL)
		return NULL;
	return ZSTD_initStaticDCtx(workspace, workspace_size);
}
EXPORT_SYMBOL(zstd_init_dctx);

size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
	const void *src, size_t src_size)
{
	return ZSTD_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
}
EXPORT_SYMBOL(zstd_decompress_dctx);

size_t zstd_decompress_using_ddict(zstd_dctx *dctx,
	void *dst, size_t dst_capacity, const void* src, size_t src_size,

Annotation

Implementation Notes