Blame view
lib/decompress.c
1.53 KB
889c92d21
|
1 2 3 4 5 6 7 8 9 10 |
/* * 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> |
3ebe12439
|
11 |
#include <linux/decompress/unxz.h> |
889c92d21
|
12 |
#include <linux/decompress/inflate.h> |
cacb246f8
|
13 |
#include <linux/decompress/unlzo.h> |
e76e1fdfa
|
14 |
#include <linux/decompress/unlz4.h> |
889c92d21
|
15 16 17 |
#include <linux/types.h> #include <linux/string.h> |
33e2a4227
|
18 |
#include <linux/init.h> |
889c92d21
|
19 |
|
23a22d57a
|
20 21 22 23 24 25 26 27 28 |
#ifndef CONFIG_DECOMPRESS_GZIP # define gunzip NULL #endif #ifndef CONFIG_DECOMPRESS_BZIP2 # define bunzip2 NULL #endif #ifndef CONFIG_DECOMPRESS_LZMA # define unlzma NULL #endif |
3ebe12439
|
29 30 31 |
#ifndef CONFIG_DECOMPRESS_XZ # define unxz NULL #endif |
cacb246f8
|
32 33 34 |
#ifndef CONFIG_DECOMPRESS_LZO # define unlzo NULL #endif |
e76e1fdfa
|
35 36 37 |
#ifndef CONFIG_DECOMPRESS_LZ4 # define unlz4 NULL #endif |
23a22d57a
|
38 |
|
33e2a4227
|
39 |
struct compress_format { |
889c92d21
|
40 41 42 |
unsigned char magic[2]; const char *name; decompress_fn decompressor; |
33e2a4227
|
43 |
}; |
6f9982bdd
|
44 |
static const struct compress_format compressed_formats[] __initconst = { |
889c92d21
|
45 46 |
{ {037, 0213}, "gzip", gunzip }, { {037, 0236}, "gzip", gunzip }, |
889c92d21
|
47 |
{ {0x42, 0x5a}, "bzip2", bunzip2 }, |
889c92d21
|
48 |
{ {0x5d, 0x00}, "lzma", unlzma }, |
3ebe12439
|
49 |
{ {0xfd, 0x37}, "xz", unxz }, |
cacb246f8
|
50 |
{ {0x89, 0x4c}, "lzo", unlzo }, |
e76e1fdfa
|
51 |
{ {0x02, 0x21}, "lz4", unlz4 }, |
889c92d21
|
52 53 |
{ {0, 0}, NULL, NULL } }; |
33e2a4227
|
54 |
decompress_fn __init decompress_method(const unsigned char *inbuf, int len, |
889c92d21
|
55 56 57 58 59 60 |
const char **name) { const struct compress_format *cf; if (len < 2) return NULL; /* Need at least this much... */ |
e4aa7ca5a
|
61 |
for (cf = compressed_formats; cf->name; cf++) { |
889c92d21
|
62 63 64 65 66 67 68 69 |
if (!memcmp(inbuf, cf->magic, 2)) break; } if (name) *name = cf->name; return cf->decompressor; } |