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  1. /* Bra.h -- Branch converters for executables
  2. 2008-10-04 : Igor Pavlov : Public domain */
  3.  
  4. #ifndef __BRA_H
  5. #define __BRA_H
  6.  
  7. #include "Types.h"
  8.  
  9. /*
  10. These functions convert relative addresses to absolute addresses
  11. in CALL instructions to increase the compression ratio.
  12.  
  13.   In:
  14.     data     - data buffer
  15.     size     - size of data
  16.     ip       - current virtual Instruction Pinter (IP) value
  17.     state    - state variable for x86 converter
  18.     encoding - 0 (for decoding), 1 (for encoding)
  19.  
  20.   Out:
  21.     state    - state variable for x86 converter
  22.  
  23.   Returns:
  24.     The number of processed bytes. If you call these functions with multiple calls,
  25.     you must start next call with first byte after block of processed bytes.
  26.  
  27.   Type   Endian  Alignment  LookAhead
  28.  
  29.   x86    little      1          4
  30.   ARMT   little      2          2
  31.   ARM    little      4          0
  32.   PPC     big        4          0
  33.   SPARC   big        4          0
  34.   IA64   little     16          0
  35.  
  36.   size must be >= Alignment + LookAhead, if it's not last block.
  37.   If (size < Alignment + LookAhead), converter returns 0.
  38.  
  39.   Example:
  40.  
  41.     UInt32 ip = 0;
  42.     for ()
  43.     {
  44.       ; size must be >= Alignment + LookAhead, if it's not last block
  45.       SizeT processed = Convert(data, size, ip, 1);
  46.       data += processed;
  47.       size -= processed;
  48.       ip += processed;
  49.     }
  50. */
  51.  
  52. #define x86_Convert_Init(state) { state = 0; }
  53. SizeT x86_Convert(Byte *data, SizeT size, UInt32 ip, UInt32 *state, int encoding);
  54. SizeT ARM_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
  55. SizeT ARMT_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
  56. SizeT PPC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
  57. SizeT SPARC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
  58. SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
  59.  
  60. #endif
  61.