關(guān)于unpack_to_rootfs()的疑問(wèn)

chishanmingshen

回復(fù) 10# wangcong02345


    你看的函數(shù)decompressor是哪一個(gè)？

wangcong02345

decompress = decompress_method(buf, len, &compress_name);  這個(gè)函數(shù)根據(jù)壓縮文件(ramdisk.img)的頭兩個(gè)字節(jié)(0x1f,0x8b)
在內(nèi)核文件lib/decompress.c中有

1. 34 static const struct compress_format {
   
2. 35     unsigned char magic[2];
   
3. 36     const char *name;
   
4. 37     decompress_fn decompressor;
   
5. 38 } compressed_formats[] = {
   
6. 39     { {037, 0213}, "gzip", gunzip },            //轉(zhuǎn)為16進(jìn)制0x1f 0x8b
   
7. 40     { {037, 0236}, "gzip", gunzip },
   
8. 41     { {0x42, 0x5a}, "bzip2", bunzip2 },
   
9. 42     { {0x5d, 0x00}, "lzma", unlzma },
   
10. 43     { {0xfd, 0x37}, "xz", unxz },
    
11. 44     { {0x89, 0x4c}, "lzo", unlzo },
    
12. 45     { {0, 0}, NULL, NULL }
    
13. 46 };

復(fù)制代碼

所以解壓調(diào)用的是內(nèi)核的lib/decompress_inflate.c中的gunzip這個(gè)函數(shù)

chishanmingshen

回復(fù) 12# wangcong02345


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