linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * decompress.c

 *

 * Detect the decompression method based on magic number

 */

​

#include <linux/decompress/generic.h>

​

#include <linux/decompress/bunzip2.h>

#include <linux/decompress/unlzma.h>

#include <linux/decompress/unxz.h>

#include <linux/decompress/inflate.h>

#include <linux/decompress/unlzo.h>

#include <linux/decompress/unlz4.h>

​

#include <linux/types.h>

#include <linux/string.h>

#include <linux/init.h>

#include <linux/printk.h>

​

#ifndef CONFIG_DECOMPRESS_GZIP

# define gunzip NULL

#endif

#ifndef CONFIG_DECOMPRESS_BZIP2

# define bunzip2 NULL

#endif

#ifndef CONFIG_DECOMPRESS_LZMA

# define unlzma NULL

#endif

#ifndef CONFIG_DECOMPRESS_XZ

# define unxz NULL

#endif

#ifndef CONFIG_DECOMPRESS_LZO

# define unlzo NULL

#endif

#ifndef CONFIG_DECOMPRESS_LZ4

# define unlz4 NULL

#endif

​

struct compress_format {

    unsigned char magic[2];

    const char *name;

    decompress_fn decompressor;

};

​

static const struct compress_format compressed_formats[] __initconst = {

    { {0x1f, 0x8b}, "gzip", gunzip },

    { {0x1f, 0x9e}, "gzip", gunzip },

    { {0x42, 0x5a}, "bzip2", bunzip2 },

    { {0x5d, 0x00}, "lzma", unlzma },

    { {0xfd, 0x37}, "xz", unxz },

    { {0x89, 0x4c}, "lzo", unlzo },

    { {0x02, 0x21}, "lz4", unlz4 },

    { {0, 0}, NULL, NULL }

};

​

decompress_fn __init decompress_method(const unsigned char *inbuf, long len,

                const char **name)

{

    const struct compress_format *cf;

​

    if (len < 2) {