linux-imx

/*

 * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd

 *

 * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#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 (8 << 20)

#define ARCHIVE_MAGICNUMBER 0x184C2102

​

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))

{

    int ret = -1;

    size_t chunksize = 0;

    size_t uncomp_chunksize = LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE;

    u8 *inp;

    u8 *inp_start;

    u8 *outp;

    long size = in_len;

#ifdef PREBOOT

    size_t out_len = get_unaligned_le32(input + in_len);

#endif

    size_t dest_len;

​

​

    if (output) {

        outp = output;

    } else if (!flush) {

        error("NULL output pointer and no flush function provided");

        goto exit_0;

    } else {

        outp = large_malloc(uncomp_chunksize);

        if (!outp) {

            error("Could not allocate output buffer");

            goto exit_0;

        }