| 1 | /* Bra.h -- Branch converters for executables |
| 2 | 2013-01-18 : Igor Pavlov : Public domain */ |
| 3 | |
| 4 | #ifndef __BRA_H |
| 5 | #define __BRA_H |
| 6 | |
| 7 | #include "7zTypes.h" |
| 8 | |
| 9 | EXTERN_C_BEGIN |
| 10 | |
| 11 | /* |
| 12 | These functions convert relative addresses to absolute addresses |
| 13 | in CALL instructions to increase the compression ratio. |
| 14 | |
| 15 | In: |
| 16 | data - data buffer |
| 17 | size - size of data |
| 18 | ip - current virtual Instruction Pinter (IP) value |
| 19 | state - state variable for x86 converter |
| 20 | encoding - 0 (for decoding), 1 (for encoding) |
| 21 | |
| 22 | Out: |
| 23 | state - state variable for x86 converter |
| 24 | |
| 25 | Returns: |
| 26 | The number of processed bytes. If you call these functions with multiple calls, |
| 27 | you must start next call with first byte after block of processed bytes. |
| 28 | |
| 29 | Type Endian Alignment LookAhead |
| 30 | |
| 31 | x86 little 1 4 |
| 32 | ARMT little 2 2 |
| 33 | ARM little 4 0 |
| 34 | PPC big 4 0 |
| 35 | SPARC big 4 0 |
| 36 | IA64 little 16 0 |
| 37 | |
| 38 | size must be >= Alignment + LookAhead, if it's not last block. |
| 39 | If (size < Alignment + LookAhead), converter returns 0. |
| 40 | |
| 41 | Example: |
| 42 | |
| 43 | UInt32 ip = 0; |
| 44 | for () |
| 45 | { |
| 46 | ; size must be >= Alignment + LookAhead, if it's not last block |
| 47 | SizeT processed = Convert(data, size, ip, 1); |
| 48 | data += processed; |
| 49 | size -= processed; |
| 50 | ip += processed; |
| 51 | } |
| 52 | */ |
| 53 | |
| 54 | #define x86_Convert_Init(state) { state = 0; } |
| 55 | SizeT x86_Convert(Byte *data, SizeT size, UInt32 ip, UInt32 *state, int encoding); |
| 56 | SizeT ARM_Convert(Byte *data, SizeT size, UInt32 ip, int encoding); |
| 57 | SizeT ARMT_Convert(Byte *data, SizeT size, UInt32 ip, int encoding); |
| 58 | SizeT PPC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding); |
| 59 | SizeT SPARC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding); |
| 60 | SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding); |
| 61 | |
| 62 | EXTERN_C_END |
| 63 | |
| 64 | #endif |