xevion/easy7zip
1
0
Fork 0
mirror of https://github.com/Xevion/easy7zip.git synced 2025-12-07 16:07:05 -06:00
Code Issues Packages Projects Releases Wiki Activity

4.48 beta

Browse Source
This commit is contained in:
Igor Pavlov
2007-06-26 00:00:00 +00:00
committed by Kornel Lesiński
parent 0b33f700a6
commit fd8b1d78b4
249 changed files with 3224 additions and 2157 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
C/Compress/Branch/BranchX86.c
View File

@@ -2,100 +2,83 @@
#include "BranchX86.h"
/*
static int inline Test86MSByte(Byte b)
{
return (b == 0 || b == 0xFF);
}
*/
#define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
const int kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
const Byte kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0};
const Byte kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3};
/*
void x86_Convert_Init(UInt32 *prevMask, UInt32 *prevPos)
SizeT x86_Convert(Byte *buffer, SizeT endPos, UInt32 nowPos, UInt32 *prevMaskMix, int encoding)
{
*prevMask = 0;
*prevPos = (UInt32)(-5);
}
*/
UInt32 x86_Convert(Byte *buffer, UInt32 endPos, UInt32 nowPos,
UInt32 *prevMask, UInt32 *prevPos, int encoding)
{
UInt32 bufferPos = 0;
UInt32 limit;
SizeT bufferPos = 0, prevPosT;
UInt32 prevMask = *prevMaskMix & 0x7;
if (endPos < 5)
return 0;
if (nowPos - *prevPos > 5)
*prevPos = nowPos - 5;
limit = endPos - 5;
while(bufferPos <= limit)
nowPos += 5;
prevPosT = (SizeT)0 - 1;
for(;;)
{
Byte b = buffer[bufferPos];
UInt32 offset;
if (b != 0xE8 && b != 0xE9)
{
bufferPos++;
continue;
}
offset = (nowPos + bufferPos - *prevPos);
*prevPos = (nowPos + bufferPos);
if (offset > 5)
*prevMask = 0;
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
{
UInt32 i;
for (i = 0; i < offset; i++)
prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7;
if (prevMask != 0)
{
*prevMask &= 0x77;
*prevMask <<= 1;
Byte b = p[4 - kMaskToBitNumber[prevMask]];
if (!kMaskToAllowedStatus[prevMask] || Test86MSByte(b))
{
prevPosT = bufferPos;
prevMask = ((prevMask << 1) & 0x7) | 1;
bufferPos++;
continue;
}
}
}
b = buffer[bufferPos + 4];
if (Test86MSByte(b) && kMaskToAllowedStatus[(*prevMask >> 1) & 0x7] &&
(*prevMask >> 1) < 0x10)
prevPosT = bufferPos;
if (Test86MSByte(p[4]))
{
UInt32 src =
((UInt32)(b) << 24) |
((UInt32)(buffer[bufferPos + 3]) << 16) |
((UInt32)(buffer[bufferPos + 2]) << 8) |
(buffer[bufferPos + 1]);
UInt32 src = ((UInt32)p[4] << 24) | ((UInt32)p[3] << 16) | ((UInt32)p[2] << 8) | ((UInt32)p[1]);
UInt32 dest;
for (;;)
{
UInt32 index;
Byte b;
int index;
if (encoding)
dest = (nowPos + bufferPos + 5) + src;
dest = (nowPos + (UInt32)bufferPos) + src;
else
dest = src - (nowPos + bufferPos + 5);
if (*prevMask == 0)
dest = src - (nowPos + (UInt32)bufferPos);
if (prevMask == 0)
break;
index = kMaskToBitNumber[*prevMask >> 1];
b = (Byte)(dest >> (24 - index * 8));
index = kMaskToBitNumber[prevMask] * 8;
b = (Byte)(dest >> (24 - index));
if (!Test86MSByte(b))
break;
src = dest ^ ((1 << (32 - index * 8)) - 1);
src = dest ^ ((1 << (32 - index)) - 1);
}
buffer[bufferPos + 4] = (Byte)(~(((dest >> 24) & 1) - 1));
buffer[bufferPos + 3] = (Byte)(dest >> 16);
buffer[bufferPos + 2] = (Byte)(dest >> 8);
buffer[bufferPos + 1] = (Byte)dest;
p[4] = (Byte)(~(((dest >> 24) & 1) - 1));
p[3] = (Byte)(dest >> 16);
p[2] = (Byte)(dest >> 8);
p[1] = (Byte)dest;
bufferPos += 5;
*prevMask = 0;
}
else
{
prevMask = ((prevMask << 1) & 0x7) | 1;
bufferPos++;
*prevMask |= 1;
if (Test86MSByte(b))
*prevMask |= 0x10;
}
}
prevPosT = bufferPos - prevPosT;
*prevMaskMix = ((prevPosT > 3) ? 0 : ((prevMask << ((int)prevPosT - 1)) & 0x7));
return bufferPos;
}