1 /* Bcj2.c -- Converter for x86 code (BCJ2)
2 2008-10-04 : Igor Pavlov : Public domain */
12 #define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80)
13 #define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1))
15 #define kNumTopBits 24
16 #define kTopValue ((UInt32)1 << kNumTopBits)
18 #define kNumBitModelTotalBits 11
19 #define kBitModelTotal (1 << kNumBitModelTotalBits)
20 #define kNumMoveBits 5
22 #define RC_READ_BYTE (*buffer++)
23 #define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; }
24 #define RC_INIT2 code = 0; range = 0xFFFFFFFF; \
25 { int i; for (i = 0; i < 5; i++) { RC_TEST; code = (code << 8) | RC_READ_BYTE; }}
27 #define NORMALIZE if (range < kTopValue) { RC_TEST; range <<= 8; code = (code << 8) | RC_READ_BYTE; }
29 #define IF_BIT_0(p) ttt = *(p); bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
30 #define UPDATE_0(p) range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE;
31 #define UPDATE_1(p) range -= bound; code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE;
34 const Byte
*buf0
, SizeT size0
,
35 const Byte
*buf1
, SizeT size1
,
36 const Byte
*buf2
, SizeT size2
,
37 const Byte
*buf3
, SizeT size3
,
38 Byte
*outBuf
, SizeT outSize
)
41 SizeT inPos
= 0, outPos
= 0;
43 const Byte
*buffer
, *bufferLim
;
48 for (i
= 0; i
< sizeof(p
) / sizeof(p
[0]); i
++)
49 p
[i
] = kBitModelTotal
>> 1;
52 bufferLim
= buffer
+ size3
;
65 SizeT limit
= size0
- inPos
;
66 if (outSize
- outPos
< limit
)
67 limit
= outSize
- outPos
;
79 if (limit
== 0 || outPos
== outSize
)
105 return SZ_ERROR_DATA
;
113 return SZ_ERROR_DATA
;
117 dest
= (((UInt32
)v
[0] << 24) | ((UInt32
)v
[1] << 16) |
118 ((UInt32
)v
[2] << 8) | ((UInt32
)v
[3])) - ((UInt32
)outPos
+ 4);
119 outBuf
[outPos
++] = (Byte
)dest
;
120 if (outPos
== outSize
)
122 outBuf
[outPos
++] = (Byte
)(dest
>> 8);
123 if (outPos
== outSize
)
125 outBuf
[outPos
++] = (Byte
)(dest
>> 16);
126 if (outPos
== outSize
)
128 outBuf
[outPos
++] = prevByte
= (Byte
)(dest
>> 24);
131 return (outPos
== outSize
) ? SZ_OK
: SZ_ERROR_DATA
;