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147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
/* Bcj2.h -- BCJ2 Converter for x86 code
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2014-11-10 : Igor Pavlov : Public domain */
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#ifndef __BCJ2_H
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#define __BCJ2_H
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#include "7zTypes.h"
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EXTERN_C_BEGIN
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#define BCJ2_NUM_STREAMS 4
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enum
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{
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BCJ2_STREAM_MAIN,
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BCJ2_STREAM_CALL,
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BCJ2_STREAM_JUMP,
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BCJ2_STREAM_RC
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};
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enum
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{
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BCJ2_DEC_STATE_ORIG_0 = BCJ2_NUM_STREAMS,
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BCJ2_DEC_STATE_ORIG_1,
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BCJ2_DEC_STATE_ORIG_2,
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BCJ2_DEC_STATE_ORIG_3,
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BCJ2_DEC_STATE_ORIG,
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BCJ2_DEC_STATE_OK
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};
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enum
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{
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BCJ2_ENC_STATE_ORIG = BCJ2_NUM_STREAMS,
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BCJ2_ENC_STATE_OK
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};
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#define BCJ2_IS_32BIT_STREAM(s) ((s) == BCJ2_STREAM_CALL || (s) == BCJ2_STREAM_JUMP)
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/*
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CBcj2Dec / CBcj2Enc
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bufs sizes:
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BUF_SIZE(n) = lims[n] - bufs[n]
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bufs sizes for BCJ2_STREAM_CALL and BCJ2_STREAM_JUMP must be mutliply of 4:
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(BUF_SIZE(BCJ2_STREAM_CALL) & 3) == 0
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(BUF_SIZE(BCJ2_STREAM_JUMP) & 3) == 0
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*/
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/*
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CBcj2Dec:
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dest is allowed to overlap with bufs[BCJ2_STREAM_MAIN], with the following conditions:
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bufs[BCJ2_STREAM_MAIN] >= dest &&
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bufs[BCJ2_STREAM_MAIN] - dest >= tempReserv +
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BUF_SIZE(BCJ2_STREAM_CALL) +
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BUF_SIZE(BCJ2_STREAM_JUMP)
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tempReserv = 0 : for first call of Bcj2Dec_Decode
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tempReserv = 4 : for any other calls of Bcj2Dec_Decode
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overlap with offset = 1 is not allowed
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*/
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typedef struct
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{
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const Byte *bufs[BCJ2_NUM_STREAMS];
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const Byte *lims[BCJ2_NUM_STREAMS];
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Byte *dest;
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const Byte *destLim;
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unsigned state; /* BCJ2_STREAM_MAIN has more priority than BCJ2_STATE_ORIG */
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UInt32 ip;
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Byte temp[4];
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UInt32 range;
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UInt32 code;
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UInt16 probs[2 + 256];
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} CBcj2Dec;
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void Bcj2Dec_Init(CBcj2Dec *p);
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/* Returns: SZ_OK or SZ_ERROR_DATA */
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SRes Bcj2Dec_Decode(CBcj2Dec *p);
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#define Bcj2Dec_IsFinished(_p_) ((_p_)->code == 0)
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typedef enum
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{
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BCJ2_ENC_FINISH_MODE_CONTINUE,
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BCJ2_ENC_FINISH_MODE_END_BLOCK,
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BCJ2_ENC_FINISH_MODE_END_STREAM
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} EBcj2Enc_FinishMode;
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typedef struct
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{
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Byte *bufs[BCJ2_NUM_STREAMS];
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const Byte *lims[BCJ2_NUM_STREAMS];
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const Byte *src;
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const Byte *srcLim;
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unsigned state;
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EBcj2Enc_FinishMode finishMode;
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Byte prevByte;
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Byte cache;
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UInt32 range;
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UInt64 low;
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UInt64 cacheSize;
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UInt32 ip;
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/* 32-bit ralative offset in JUMP/CALL commands is
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- (mod 4 GB) in 32-bit mode
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- signed Int32 in 64-bit mode
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We use (mod 4 GB) check for fileSize.
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Use fileSize up to 2 GB, if you want to support 32-bit and 64-bit code conversion. */
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UInt32 fileIp;
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UInt32 fileSize; /* (fileSize <= ((UInt32)1 << 31)), 0 means no_limit */
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UInt32 relatLimit; /* (relatLimit <= ((UInt32)1 << 31)), 0 means desable_conversion */
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UInt32 tempTarget;
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unsigned tempPos;
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Byte temp[4 * 2];
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unsigned flushPos;
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UInt16 probs[2 + 256];
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} CBcj2Enc;
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void Bcj2Enc_Init(CBcj2Enc *p);
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void Bcj2Enc_Encode(CBcj2Enc *p);
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#define Bcj2Enc_Get_InputData_Size(p) ((SizeT)((p)->srcLim - (p)->src) + (p)->tempPos)
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#define Bcj2Enc_IsFinished(p) ((p)->flushPos == 5)
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#define BCJ2_RELAT_LIMIT_NUM_BITS 26
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#define BCJ2_RELAT_LIMIT ((UInt32)1 << BCJ2_RELAT_LIMIT_NUM_BITS)
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/* limit for CBcj2Enc::fileSize variable */
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#define BCJ2_FileSize_MAX ((UInt32)1 << 31)
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EXTERN_C_END
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#endif
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