target/linux/brcm47xx/patches-2.6.28/500-lzma_initramfs.patch

   1 diff --git a/init/initramfs.c b/init/initramfs.c
   2 --- a/init/initramfs.c
   3 +++ b/init/initramfs.c
   4 @@ -475,6 +475,69 @@ static void __init flush_window(void)
   5         outcnt = 0;
   6  }
   7
   8 +#include <linux/LzmaDecode.h>
   9 +static int __init lzma_unzip(void)
  10 +{
  11 +       unsigned int i;  /* temp value */
  12 +       unsigned int lc; /* literal context bits */
  13 +       unsigned int lp; /* literal pos state bits */
  14 +       unsigned int pb; /* pos state bits */
  15 +       unsigned int osize; /* uncompressed size */
  16 +       unsigned char *workspace;
  17 +       unsigned char* outputbuffer;
  18 +       unsigned int outsizeProcessed = 0;
  19 +       int workspace_size;
  20 +       int res;
  21 +
  22 +       // lzma args
  23 +       i = get_byte();
  24 +       lc = i % 9, i = i / 9;
  25 +       lp = i % 5, pb = i / 5;
  26 +
  27 +       // skip dictionary size
  28 +       for (i = 0; i < 4; i++)
  29 +               get_byte();
  30 +
  31 +       /* read the lower half of uncompressed size in the header */
  32 +       osize = ((unsigned int)get_byte()) +
  33 +               ((unsigned int)get_byte() << 8) +
  34 +               ((unsigned int)get_byte() << 16) +
  35 +               ((unsigned int)get_byte() << 24);
  36 +
  37 +       /* skip rest of the header (upper half of uncompressed size) */
  38 +       for (i = 0; i < 4; i++)
  39 +               get_byte();
  40 +
  41 +       workspace_size = ((LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp))) * sizeof(CProb)) + 100;
  42 +       printk( KERN_NOTICE "initramfs: LZMA lc=%d,lp=%d,pb=%d,origSize=%d\n",
  43 +       lc,lp,pb,osize);
  44 +       outputbuffer = kmalloc(osize, GFP_KERNEL);
  45 +       if (outputbuffer == 0) {
  46 +               printk(KERN_ERR "initramfs: Couldn't allocate lzma output buffer\n");
  47 +               return -1;
  48 +       }
  49 +
  50 +       workspace = kmalloc(workspace_size, GFP_KERNEL);
  51 +       if (workspace == NULL) {
  52 +               printk(KERN_ERR "initramfs: Couldn't allocate lzma workspace\n");
  53 +               return -1;
  54 +       }
  55 +
  56 +       res = LzmaDecode(workspace, workspace_size, lc, lp, pb, inbuf + inptr, insize - inptr, outputbuffer, osize, &outsizeProcessed);
  57 +       if( res != 0 ) {
  58 +               panic( KERN_ERR "initramfs: Lzma decode failure\n");
  59 +               return -1;
  60 +       }
  61 +
  62 +       flush_buffer(outputbuffer, outsizeProcessed);
  63 +       inptr = insize;
  64 +
  65 +       kfree(outputbuffer);
  66 +       kfree(workspace);
  67 +       state = Reset;
  68 +       return 0;
  69 +}
  70 +
  71  static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
  72  {
  73         int written;
  74 @@ -509,12 +572,28 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
  75                 inptr = 0;
  76                 outcnt = 0;             /* bytes in output buffer */
  77                 bytes_out = 0;
  78 -               crc = (ulg)0xffffffffL; /* shift register contents */
  79 -               makecrc();
  80 -               gunzip();
  81 -               if (state != Reset)
  82 +               if( inbuf[0] == 037 && ((inbuf[1] == 0213) || (inbuf[1] == 0236)))
  83 +               {
  84 +                  printk( KERN_NOTICE "detected gzip initramfs\n");
  85 +                  crc = (ulg)0xffffffffL; /* shift register contents */
  86 +                  makecrc();
  87 +                  gunzip();
  88 +                  if (state != Reset)
  89                         error("junk in gzipped archive");
  90 -               this_header = saved_offset + inptr;
  91 +               }
  92 +               else if(!memcmp(inbuf+1, "\x00\x00\x80\x00", 4)) /* FIXME: hardcoded dictionary size */
  93 +               {
  94 +                  printk( KERN_NOTICE "detected lzma initramfs\n");
  95 +                  lzma_unzip();
  96 +               }
  97 +               else
  98 +               {
  99 +                  // skip forward ?
 100 +                  crc = (ulg)0xffffffffL; /* shift register contents */
 101 +                  makecrc();
 102 +                  gunzip();
 103 +               }
 104 +               this_header = saved_offset + inptr;
 105                 buf += inptr;
 106                 len -= inptr;
 107         }
 108 diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
 109 --- a/scripts/gen_initramfs_list.sh
 110 +++ b/scripts/gen_initramfs_list.sh
 111 @@ -287,7 +287,7 @@ if [ ! -z ${output_file} ]; then
 112         if [ "${is_cpio_compressed}" = "compressed" ]; then
 113                 cat ${cpio_tfile} > ${output_file}
 114         else
 115 -               cat ${cpio_tfile} | gzip -f -9 - > ${output_file}
 116 +               lzma e -lc1 -lp2 -pb2 ${cpio_tfile} ${output_file}
 117         fi
 118         [ -z ${cpio_file} ] && rm ${cpio_tfile}
 119  fi