text: /* Bra.c -- Converters for RISC code
  2010-04-16 : Igor Pavlov : Public domain */
  
  #include "Precomp.h"
  
  #include "Bra.h"
  
  SizeT ARM_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
  {
    SizeT i;
    if (size < 4)
      return 0;
    size -= 4;
    ip += 8;
    for (i = 0; i <= size; i += 4)
    {
      if (data[i + 3] == 0xEB)
      {
        UInt32 dest;
        UInt32 src = ((UInt32)data[i + 2] << 16) | ((UInt32)data[i + 1] << 8) | (data[i + 0]);
        src <<= 2;
        if (encoding)
          dest = ip + (UInt32)i + src;
        else
          dest = src - (ip + (UInt32)i);
        dest >>= 2;
        data[i + 2] = (Byte)(dest >> 16);
        data[i + 1] = (Byte)(dest >> 8);
        data[i + 0] = (Byte)dest;
      }
    }
    return i;
  }
  
  SizeT ARMT_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
  {
    SizeT i;
    if (size < 4)
      return 0;
    size -= 4;
    ip += 4;
    for (i = 0; i <= size; i += 2)
    {
      if ((data[i + 1] & 0xF8) == 0xF0 &&
          (data[i + 3] & 0xF8) == 0xF8)
      {
        UInt32 dest;
        UInt32 src =
          (((UInt32)data[i + 1] & 0x7) << 19) |
          ((UInt32)data[i + 0] << 11) |
          (((UInt32)data[i + 3] & 0x7) << 8) |
          (data[i + 2]);
        
        src <<= 1;
        if (encoding)
          dest = ip + (UInt32)i + src;
        else
          dest = src - (ip + (UInt32)i);
        dest >>= 1;
        
        data[i + 1] = (Byte)(0xF0 | ((dest >> 19) & 0x7));
        data[i + 0] = (Byte)(dest >> 11);
        data[i + 3] = (Byte)(0xF8 | ((dest >> 8) & 0x7));
        data[i + 2] = (Byte)dest;
        i += 2;
      }
    }
    return i;
  }
  
  SizeT PPC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
  {
    SizeT i;
    if (size < 4)
      return 0;
    size -= 4;
    for (i = 0; i <= size; i += 4)
    {
      if ((data[i] >> 2) == 0x12 && (data[i + 3] & 3) == 1)
      {
        UInt32 src = ((UInt32)(data[i + 0] & 3) << 24) |
          ((UInt32)data[i + 1] << 16) |
          ((UInt32)data[i + 2] << 8) |
          ((UInt32)data[i + 3] & (~3));
        
        UInt32 dest;
        if (encoding)
          dest = ip + (UInt32)i + src;
        else
          dest = src - (ip + (UInt32)i);
        data[i + 0] = (Byte)(0x48 | ((dest >> 24) &  0x3));
        data[i + 1] = (Byte)(dest >> 16);
        data[i + 2] = (Byte)(dest >> 8);
        data[i + 3] &= 0x3;
        data[i + 3] |= dest;
      }
    }
    return i;
  }
  
  SizeT SPARC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding)
  {
    UInt32 i;
    if (size < 4)
      return 0;
    size -= 4;
    for (i = 0; i <= size; i += 4)
    {
      if ((data[i] == 0x40 && (data[i + 1] & 0xC0) == 0x00) ||
          (data[i] == 0x7F && (data[i + 1] & 0xC0) == 0xC0))
      {
        UInt32 src =
          ((UInt32)data[i + 0] << 24) |
          ((UInt32)data[i + 1] << 16) |
          ((UInt32)data[i + 2] << 8) |
          ((UInt32)data[i + 3]);
        UInt32 dest;
        
        src <<= 2;
        if (encoding)
          dest = ip + i + src;
        else
          dest = src - (ip + i);
        dest >>= 2;
        
        dest = (((0 - ((dest >> 22) & 1)) << 22) & 0x3FFFFFFF) | (dest & 0x3FFFFF) | 0x40000000;
  
        data[i + 0] = (Byte)(dest >> 24);
        data[i + 1] = (Byte)(dest >> 16);
        data[i + 2] = (Byte)(dest >> 8);
        data[i + 3] = (Byte)dest;
      }
    }
    return i;
  }
  