1 /* Bra86.c -- Converter for x86 code (BCJ)
2 2017-04-03 : Igor Pavlov : Public domain */
8 #define Test86MSByte(b) ((((b) + 1) & 0xFE) == 0)
10 SizeT x86_Convert(Byte *data, SizeT size, UInt32 ip, UInt32 *state, int encoding)
13 UInt32 mask = *state & 7;
22 const Byte *limit = data + size;
23 for (; p < limit; p++)
24 if ((*p & 0xFE) == 0xE8)
28 SizeT d = (SizeT)(p - data - pos);
29 pos = (SizeT)(p - data);
32 *state = (d > 2 ? 0 : mask >> (unsigned)d);
40 if (mask != 0 && (mask > 4 || mask == 3 || Test86MSByte(p[(size_t)(mask >> 1) + 1])))
42 mask = (mask >> 1) | 4;
49 if (Test86MSByte(p[4]))
51 UInt32 v = ((UInt32)p[4] << 24) | ((UInt32)p[3] << 16) | ((UInt32)p[2] << 8) | ((UInt32)p[1]);
52 UInt32 cur = ip + (UInt32)pos;
60 unsigned sh = (mask & 6) << 2;
61 if (Test86MSByte((Byte)(v >> sh)))
63 v ^= (((UInt32)0x100 << sh) - 1);
72 p[2] = (Byte)(v >> 8);
73 p[3] = (Byte)(v >> 16);
74 p[4] = (Byte)(0 - ((v >> 24) & 1));
78 mask = (mask >> 1) | 4;