target/linux/brcm47xx/patches-2.6.23/500-lzma_initramfs.patch

   1 --- a/scripts/gen_initramfs_list.sh
   2 +++ b/scripts/gen_initramfs_list.sh
   3 @@ -287,7 +287,7 @@
   4         if [ "${is_cpio_compressed}" = "compressed" ]; then
   5                 cat ${cpio_tfile} > ${output_file}
   6         else
   7 -               cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
   8 +               lzma e -lc1 -lp2 -pb2 ${cpio_tfile} ${output_file}
   9         fi
  10         [ -z ${cpio_file} ] && rm ${cpio_tfile}
  11  fi
  12 --- a/init/initramfs.c
  13 +++ b/init/initramfs.c
  14 @@ -441,6 +441,69 @@
  15         outcnt = 0;
  16  }
  17
  18 +#include <linux/LzmaDecode.h>
  19 +static int __init lzma_unzip(void)
  20 +{
  21 +       unsigned int i;  /* temp value */
  22 +       unsigned int lc; /* literal context bits */
  23 +       unsigned int lp; /* literal pos state bits */
  24 +       unsigned int pb; /* pos state bits */
  25 +       unsigned int osize; /* uncompressed size */
  26 +       unsigned char *workspace;
  27 +       unsigned char* outputbuffer;
  28 +       unsigned int outsizeProcessed = 0;
  29 +       int workspace_size;
  30 +       int res;
  31 +
  32 +       // lzma args
  33 +       i = get_byte();
  34 +       lc = i % 9, i = i / 9;
  35 +       lp = i % 5, pb = i / 5;
  36 +
  37 +       // skip dictionary size
  38 +       for (i = 0; i < 4; i++)
  39 +               get_byte();
  40 +
  41 +       /* read the lower half of uncompressed size in the header */
  42 +       osize = ((unsigned int)get_byte()) +
  43 +               ((unsigned int)get_byte() << 8) +
  44 +               ((unsigned int)get_byte() << 16) +
  45 +               ((unsigned int)get_byte() << 24);
  46 +
  47 +       /* skip rest of the header (upper half of uncompressed size) */
  48 +       for (i = 0; i < 4; i++)
  49 +               get_byte();
  50 +
  51 +       workspace_size = ((LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp))) * sizeof(CProb)) + 100;
  52 +       printk( KERN_NOTICE "initramfs: LZMA lc=%d,lp=%d,pb=%d,origSize=%d\n",
  53 +       lc,lp,pb,osize);
  54 +       outputbuffer = kmalloc(osize, GFP_KERNEL);
  55 +       if (outputbuffer == 0) {
  56 +               printk(KERN_ERR "initramfs: Couldn't allocate lzma output buffer\n");
  57 +               return -1;
  58 +       }
  59 +
  60 +       workspace = kmalloc(workspace_size, GFP_KERNEL);
  61 +       if (workspace == NULL) {
  62 +               printk(KERN_ERR "initramfs: Couldn't allocate lzma workspace\n");
  63 +               return -1;
  64 +       }
  65 +
  66 +       res = LzmaDecode(workspace, workspace_size, lc, lp, pb, inbuf + inptr, insize - inptr, outputbuffer, osize, &outsizeProcessed);
  67 +       if( res != 0 ) {
  68 +               panic( KERN_ERR "initramfs: Lzma decode failure\n");
  69 +               return -1;
  70 +       }
  71 +
  72 +       flush_buffer(outputbuffer, outsizeProcessed);
  73 +       inptr = insize;
  74 +
  75 +       kfree(outputbuffer);
  76 +       kfree(workspace);
  77 +       state = Reset;
  78 +       return 0;
  79 +}
  80 +
  81  static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
  82  {
  83         int written;
  84 @@ -475,12 +538,28 @@
  85                 inptr = 0;
  86                 outcnt = 0;             /* bytes in output buffer */
  87                 bytes_out = 0;
  88 -               crc = (ulg)0xffffffffL; /* shift register contents */
  89 -               makecrc();
  90 -               gunzip();
  91 -               if (state != Reset)
  92 +               if( inbuf[0] == 037 && ((inbuf[1] == 0213) || (inbuf[1] == 0236)))
  93 +               {
  94 +                  printk( KERN_NOTICE "detected gzip initramfs\n");
  95 +                  crc = (ulg)0xffffffffL; /* shift register contents */
  96 +                  makecrc();
  97 +                  gunzip();
  98 +                  if (state != Reset)
  99                         error("junk in gzipped archive");
 100 -               this_header = saved_offset + inptr;
 101 +               }
 102 +               else if(!memcmp(inbuf+1, "\x00\x00\x80\x00", 4)) /* FIXME: hardcoded dictionary size */
 103 +               {
 104 +                  printk( KERN_NOTICE "detected lzma initramfs\n");
 105 +                  lzma_unzip();
 106 +               }
 107 +               else
 108 +               {
 109 +                  // skip forward ?
 110 +                  crc = (ulg)0xffffffffL; /* shift register contents */
 111 +                  makecrc();
 112 +                  gunzip();
 113 +               }
 114 +               this_header = saved_offset + inptr;
 115                 buf += inptr;
 116                 len -= inptr;
 117         }