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Mini Shell
Mini Shell
package SevenZip.Compression.Branch;
import SevenZip.HRESULT;
import SevenZip.ICompressFilter;
public class BCJ_x86_Decoder implements ICompressFilter {
// struct CBranch86 - begin
int [] _prevMask = new int[1]; // UInt32
int [] _prevPos = new int[1]; // UInt32
void x86Init() {
_prevMask[0] = 0;
_prevPos[0] = -5;
}
// struct CBranch86 - end
static final boolean [] kMaskToAllowedStatus = {true, true, true, false, true, false, false, false };
static final int [] kMaskToBitNumber = {0, 1, 2, 2, 3, 3, 3, 3};
static final boolean Test86MSByte(int b) { return ((b) == 0 || (b) == 0xFF); }
static final int x86_Convert(byte [] buffer, int endPos, int nowPos,
int [] prevMask, int [] prevPos, boolean encoding) {
int bufferPos = 0;
int limit;
if (endPos < 5)
return 0;
if (nowPos - prevPos[0] > 5)
prevPos[0] = nowPos - 5;
limit = endPos - 5;
while(bufferPos <= limit) {
int b = (buffer[bufferPos] & 0xFF);
int offset;
if (b != 0xE8 && b != 0xE9) {
bufferPos++;
continue;
}
offset = (nowPos + bufferPos - prevPos[0]);
prevPos[0] = (nowPos + bufferPos);
if (offset > 5)
prevMask[0] = 0;
else {
for (int i = 0; i < offset; i++) {
prevMask[0] &= 0x77;
prevMask[0] <<= 1;
}
}
b = (buffer[bufferPos + 4] & 0xFF);
if (Test86MSByte(b) && kMaskToAllowedStatus[(prevMask[0] >> 1) & 0x7] &&
(prevMask[0] >>> 1) < 0x10) {
int src =
((int)(b) << 24) |
((int)(buffer[bufferPos + 3] & 0xFF) << 16) |
((int)(buffer[bufferPos + 2] & 0xFF) << 8) |
(buffer[bufferPos + 1] & 0xFF);
int dest;
for (;;) {
int index;
if (encoding)
dest = (nowPos + bufferPos + 5) + src;
else
dest = src - (nowPos + bufferPos + 5);
if (prevMask[0] == 0)
break;
index = kMaskToBitNumber[prevMask[0] >>> 1];
b = (int)((dest >> (24 - index * 8)) & 0xFF);
if (!Test86MSByte(b))
break;
src = dest ^ ((1 << (32 - index * 8)) - 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;
bufferPos += 5;
prevMask[0] = 0;
} else {
bufferPos++;
prevMask[0] |= 1;
if (Test86MSByte(b))
prevMask[0] |= 0x10;
}
}
return bufferPos;
}
public int SubFilter(byte [] data, int size) {
return x86_Convert(data, size, _bufferPos, _prevMask, _prevPos, false);
}
public void SubInit() {
x86Init();
}
int _bufferPos; // UInt32
// ICompressFilter interface
public int Init() {
_bufferPos = 0;
SubInit();
return HRESULT.S_OK;
}
public int Filter(byte [] data, int size) {
int processedSize = SubFilter(data, size);
_bufferPos += processedSize;
return processedSize;
}
}
Zerion Mini Shell 1.0