Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/Java/SevenZip/Compression/LZ/InWindow.java

-// LZ.InWindow
-
-package SevenZip.Compression.LZ;
-
-import java.io.IOException;
-
-public class InWindow
-{
-        public byte[] _bufferBase; // pointer to buffer with data
-        java.io.InputStream _stream;
-        int _posLimit;  // offset (from _buffer) of first byte when new block reading must be done
-        boolean _streamEndWasReached; // if (true) then _streamPos shows real end of stream
-        
-        int _pointerToLastSafePosition;
-        
-        public int _bufferOffset;
-        
-        public int _blockSize;  // Size of Allocated memory block
-        public int _pos;             // offset (from _buffer) of curent byte
-        int _keepSizeBefore;  // how many BYTEs must be kept in buffer before _pos
-        int _keepSizeAfter;   // how many BYTEs must be kept buffer after _pos
-        public int _streamPos;   // offset (from _buffer) of first not read byte from Stream
-        
-        public void MoveBlock()
-        {
-                int offset = _bufferOffset + _pos - _keepSizeBefore;
-                // we need one additional byte, since MovePos moves on 1 byte.
-                if (offset > 0)
-                        offset--;
-
-                int numBytes = _bufferOffset + _streamPos - offset;
-                
-                // check negative offset ????
-                for (int i = 0; i < numBytes; i++)
-                        _bufferBase[i] = _bufferBase[offset + i];
-                _bufferOffset -= offset;
-        }
-        
-        public void ReadBlock() throws IOException
-        {
-                if (_streamEndWasReached)
-                        return;
-                while (true)
-                {
-                        int size = (0 - _bufferOffset) + _blockSize - _streamPos;
-                        if (size == 0)
-                                return;
-                        int numReadBytes = _stream.read(_bufferBase, _bufferOffset + _streamPos, size);
-                        if (numReadBytes == -1)
-                        {
-                                _posLimit = _streamPos;
-                                int pointerToPostion = _bufferOffset + _posLimit;
-                                if (pointerToPostion > _pointerToLastSafePosition)
-                                        _posLimit = _pointerToLastSafePosition - _bufferOffset;
-                                
-                                _streamEndWasReached = true;
-                                return;
-                        }
-                        _streamPos += numReadBytes;
-                        if (_streamPos >= _pos + _keepSizeAfter)
-                                _posLimit = _streamPos - _keepSizeAfter;
-                }
-        }
-        
-        void Free() { _bufferBase = null; }
-        
-        public void Create(int keepSizeBefore, int keepSizeAfter, int keepSizeReserv)
-        {
-                _keepSizeBefore = keepSizeBefore;
-                _keepSizeAfter = keepSizeAfter;
-                int blockSize = keepSizeBefore + keepSizeAfter + keepSizeReserv;
-                if (_bufferBase == null || _blockSize != blockSize)
-                {
-                        Free();
-                        _blockSize = blockSize;
-                        _bufferBase = new byte[_blockSize];
-                }
-                _pointerToLastSafePosition = _blockSize - keepSizeAfter;
-        }
-        
-        public void SetStream(java.io.InputStream stream) { _stream = stream;   }
-        public void ReleaseStream() { _stream = null; }
-
-        public void Init() throws IOException
-        {
-                _bufferOffset = 0;
-                _pos = 0;
-                _streamPos = 0;
-                _streamEndWasReached = false;
-                ReadBlock();
-        }
-        
-        public void MovePos() throws IOException
-        {
-                _pos++;
-                if (_pos > _posLimit)
-                {
-                        int pointerToPostion = _bufferOffset + _pos;
-                        if (pointerToPostion > _pointerToLastSafePosition)
-                                MoveBlock();
-                        ReadBlock();
-                }
-        }
-        
-        public byte GetIndexByte(int index)     { return _bufferBase[_bufferOffset + _pos + index]; }
-        
-        // index + limit have not to exceed _keepSizeAfter;
-        public int GetMatchLen(int index, int distance, int limit)
-        {
-                if (_streamEndWasReached)
-                        if ((_pos + index) + limit > _streamPos)
-                                limit = _streamPos - (_pos + index);
-                distance++;
-                // Byte *pby = _buffer + (size_t)_pos + index;
-                int pby = _bufferOffset + _pos + index;
-                
-                int i;
-                for (i = 0; i < limit && _bufferBase[pby + i] == _bufferBase[pby + i - distance]; i++);
-                return i;
-        }
-        
-        public int GetNumAvailableBytes()       { return _streamPos - _pos; }
-        
-        public void ReduceOffsets(int subValue)
-        {
-                _bufferOffset += subValue;
-                _posLimit -= subValue;
-                _pos -= subValue;
-                _streamPos -= subValue;
-        }
-}