decompress.c 1.7 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
 * 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>
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#include <linux/decompress/unxz.h>
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#include <linux/decompress/inflate.h>
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#include <linux/decompress/unlzo.h>
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#include <linux/decompress/unlz4.h>
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#include <linux/types.h>
#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/printk.h>
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#ifndef CONFIG_DECOMPRESS_GZIP
# define gunzip NULL
#endif
#ifndef CONFIG_DECOMPRESS_BZIP2
# define bunzip2 NULL
#endif
#ifndef CONFIG_DECOMPRESS_LZMA
# define unlzma NULL
#endif
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#ifndef CONFIG_DECOMPRESS_XZ
# define unxz NULL
#endif
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#ifndef CONFIG_DECOMPRESS_LZO
# define unlzo NULL
#endif
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#ifndef CONFIG_DECOMPRESS_LZ4
# define unlz4 NULL
#endif
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struct compress_format {
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	unsigned char magic[2];
	const char *name;
	decompress_fn decompressor;
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};

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static const struct compress_format compressed_formats[] __initconst = {
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	{ {0x1f, 0x8b}, "gzip", gunzip },
	{ {0x1f, 0x9e}, "gzip", gunzip },
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	{ {0x42, 0x5a}, "bzip2", bunzip2 },
	{ {0x5d, 0x00}, "lzma", unlzma },
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	{ {0xfd, 0x37}, "xz", unxz },
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	{ {0x89, 0x4c}, "lzo", unlzo },
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	{ {0x02, 0x21}, "lz4", unlz4 },
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	{ {0, 0}, NULL, NULL }
};

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decompress_fn __init decompress_method(const unsigned char *inbuf, long len,
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				const char **name)
{
	const struct compress_format *cf;

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	if (len < 2) {
		if (name)
			*name = NULL;
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		return NULL;	/* Need at least this much... */
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	}
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	pr_debug("Compressed data magic: %#.2x %#.2x\n", inbuf[0], inbuf[1]);

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	for (cf = compressed_formats; cf->name; cf++) {
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		if (!memcmp(inbuf, cf->magic, 2))
			break;

	}
	if (name)
		*name = cf->name;
	return cf->decompressor;
}