release/src-rt-6.x/linux/linux-2.6/scripts/squashfs/lzma/C/7zip/Compress/Branch/BranchPPC.c

   1 // BranchPPC.c
   2
   3 #include "BranchPPC.h"
   4
   5 UInt32 PPC_B_Convert(Byte *data, UInt32 size, UInt32 nowPos, int encoding)
   6 {
   7   UInt32 i;
   8   for (i = 0; i + 4 <= size; i += 4)
   9   {
  10     // PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link)
  11     if ((data[i] >> 2) == 0x12 &&
  12     (
  13       (data[i + 3] & 3) == 1
  14       // || (data[i+3] & 3) == 3
  15       )
  16     )
  17     {
  18       UInt32 src = ((data[i + 0] & 3) << 24) |
  19         (data[i + 1] << 16) |
  20         (data[i + 2] << 8) |
  21         (data[i + 3] & (~3));
  22
  23       UInt32 dest;
  24       if (encoding)
  25         dest = nowPos + i + src;
  26       else
  27         dest = src - (nowPos + i);
  28       data[i + 0] = 0x48 | ((dest >> 24) &  0x3);
  29       data[i + 1] = (dest >> 16);
  30       data[i + 2] = (dest >> 8);
  31       data[i + 3] &= 0x3;
  32       data[i + 3] |= dest;
  33     }
  34   }
  35   return i;
  36 }