cregit-Linux how code gets into the kernel

Release 4.15 lib/decompress.c

Directory: lib
// 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) { if (name) *name = NULL; return NULL; /* Need at least this much... */ } pr_debug("Compressed data magic: %#.2x %#.2x\n", inbuf[0], inbuf[1]); for (cf = compressed_formats; cf->name; cf++) { if (!memcmp(inbuf, cf->magic, 2)) break; } if (name) *name = cf->name; return cf->decompressor; }

Contributors

PersonTokensPropCommitsCommitProp
H. Peter Anvin8073.39%116.67%
Daniel M. Weeks1513.76%116.67%
Aneesh Kumar K.V1110.09%116.67%
Alain Knaff10.92%116.67%
Yinghai Lu10.92%116.67%
Hein Tibosch10.92%116.67%
Total109100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
H. Peter Anvin20563.27%215.38%
Kyungsik Lee247.41%17.69%
Lasse Collin247.41%17.69%
Albin Tonnerre247.41%17.69%
Daniel M. Weeks185.56%17.69%
Aneesh Kumar K.V113.40%17.69%
Hein Tibosch103.09%17.69%
Haesung Kim41.23%17.69%
Greg Kroah-Hartman10.31%17.69%
Alain Knaff10.31%17.69%
Yinghai Lu10.31%17.69%
Andi Kleen10.31%17.69%
Total324100.00%13100.00%
Directory: lib
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