The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/decompress.c

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

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