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cycrow |
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/* Bra.h -- Branch converters for executables
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2008-10-04 : Igor Pavlov : Public domain */
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#ifndef __BRA_H
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#define __BRA_H
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#include "Types.h"
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/*
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These functions convert relative addresses to absolute addresses
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in CALL instructions to increase the compression ratio.
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In:
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data - data buffer
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size - size of data
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ip - current virtual Instruction Pinter (IP) value
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state - state variable for x86 converter
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encoding - 0 (for decoding), 1 (for encoding)
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Out:
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state - state variable for x86 converter
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Returns:
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The number of processed bytes. If you call these functions with multiple calls,
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you must start next call with first byte after block of processed bytes.
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Type Endian Alignment LookAhead
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x86 little 1 4
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ARMT little 2 2
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ARM little 4 0
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PPC big 4 0
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SPARC big 4 0
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IA64 little 16 0
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size must be >= Alignment + LookAhead, if it's not last block.
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If (size < Alignment + LookAhead), converter returns 0.
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Example:
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UInt32 ip = 0;
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for ()
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{
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; size must be >= Alignment + LookAhead, if it's not last block
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SizeT processed = Convert(data, size, ip, 1);
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data += processed;
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size -= processed;
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ip += processed;
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}
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*/
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#define x86_Convert_Init(state) { state = 0; }
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SizeT x86_Convert(Byte *data, SizeT size, UInt32 ip, UInt32 *state, int encoding);
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SizeT ARM_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
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SizeT ARMT_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
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SizeT PPC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
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SizeT SPARC_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
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SizeT IA64_Convert(Byte *data, SizeT size, UInt32 ip, int encoding);
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#endif
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