linux/lib/decompress_unlz4.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd
 *
 * Copyright (C) 2013, LG Electronics, Kyungsik Lee <[email protected]>
 */

#ifdef STATIC
#define PREBOOT
#include "lz4/lz4_decompress.c"
#else
#include <linux/decompress/unlz4.h>
#endif
#include <linux/types.h>
#include <linux/lz4.h>
#include <linux/decompress/mm.h>
#include <linux/compiler.h>

#include <asm/unaligned.h>

/*
 * Note: Uncompressed chunk size is used in the compressor side
 * (userspace side for compression).
 * It is hardcoded because there is not proper way to extract it
 * from the binary stream which is generated by the preliminary
 * version of LZ4 tool so far.
 */
#define LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE …
#define ARCHIVE_MAGICNUMBER …

STATIC inline int INIT unlz4(u8 *input, long in_len,
				long (*fill)(void *, unsigned long),
				long (*flush)(void *, unsigned long),
				u8 *output, long *posp,
				void (*error) (char *x))
{ … }

#ifdef PREBOOT
STATIC int INIT __decompress(unsigned char *buf, long in_len,
			      long (*fill)(void*, unsigned long),
			      long (*flush)(void*, unsigned long),
			      unsigned char *output, long out_len,
			      long *posp,
			      void (*error)(char *x)
	)
{
	return unlz4(buf, in_len - 4, fill, flush, output, posp, error);
}
#endif