diff -r 0135e64c6c66 -r c4fd2813b127 misc/libphysfs/lzma/C/Compress/Branch/BranchX86.c --- a/misc/libphysfs/lzma/C/Compress/Branch/BranchX86.c Wed May 16 18:22:28 2018 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,84 +0,0 @@ -/* BranchX86.c */ - -#include "BranchX86.h" - -#define Test86MSByte(b) ((b) == 0 || (b) == 0xFF) - -const Byte kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0}; -const Byte kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3}; - -SizeT x86_Convert(Byte *buffer, SizeT endPos, UInt32 nowPos, UInt32 *prevMaskMix, int encoding) -{ - SizeT bufferPos = 0, prevPosT; - UInt32 prevMask = *prevMaskMix & 0x7; - if (endPos < 5) - return 0; - nowPos += 5; - prevPosT = (SizeT)0 - 1; - - for(;;) - { - Byte *p = buffer + bufferPos; - Byte *limit = buffer + endPos - 4; - for (; p < limit; p++) - if ((*p & 0xFE) == 0xE8) - break; - bufferPos = (SizeT)(p - buffer); - if (p >= limit) - break; - prevPosT = bufferPos - prevPosT; - if (prevPosT > 3) - prevMask = 0; - else - { - prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7; - if (prevMask != 0) - { - Byte b = p[4 - kMaskToBitNumber[prevMask]]; - if (!kMaskToAllowedStatus[prevMask] || Test86MSByte(b)) - { - prevPosT = bufferPos; - prevMask = ((prevMask << 1) & 0x7) | 1; - bufferPos++; - continue; - } - } - } - prevPosT = bufferPos; - - if (Test86MSByte(p[4])) - { - UInt32 src = ((UInt32)p[4] << 24) | ((UInt32)p[3] << 16) | ((UInt32)p[2] << 8) | ((UInt32)p[1]); - UInt32 dest; - for (;;) - { - Byte b; - int index; - if (encoding) - dest = (nowPos + (UInt32)bufferPos) + src; - else - dest = src - (nowPos + (UInt32)bufferPos); - if (prevMask == 0) - break; - index = kMaskToBitNumber[prevMask] * 8; - b = (Byte)(dest >> (24 - index)); - if (!Test86MSByte(b)) - break; - src = dest ^ ((1 << (32 - index)) - 1); - } - p[4] = (Byte)(~(((dest >> 24) & 1) - 1)); - p[3] = (Byte)(dest >> 16); - p[2] = (Byte)(dest >> 8); - p[1] = (Byte)dest; - bufferPos += 5; - } - else - { - prevMask = ((prevMask << 1) & 0x7) | 1; - bufferPos++; - } - } - prevPosT = bufferPos - prevPosT; - *prevMaskMix = ((prevPosT > 3) ? 0 : ((prevMask << ((int)prevPosT - 1)) & 0x7)); - return bufferPos; -}