OFLHADecompressingStream.h

/*
 * Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3.0 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * version 3.0 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3.0 along with this program. If not, see
 * <https://www.gnu.org/licenses/>.
 */
 
#import "OFStream.h"
#import "OFHuffmanTree.h"
 
OF_ASSUME_NONNULL_BEGIN
 
#define OFLHADecompressingStreamBufferSize 4096
 
OF_DIRECT_MEMBERS
@interface OFLHADecompressingStream: OFStream
{
    OFStream *_stream;
    uint8_t _distanceBits, _dictionaryBits;
    unsigned char _buffer[OFLHADecompressingStreamBufferSize];
    uint32_t _bytesConsumed;
    uint16_t _bufferIndex, _bufferLength;
    uint8_t _byte;
    uint8_t _bitIndex, _savedBitsLength;
    uint16_t _savedBits;
    unsigned char *_slidingWindow;
    uint32_t _slidingWindowIndex, _slidingWindowMask;
    int _state;
    uint16_t _symbolsLeft;
    OFHuffmanTree _Nullable _codeLenTree;
    OFHuffmanTree _Nullable _litLenTree;
    OFHuffmanTree _Nullable _distTree;
    OFHuffmanTree _Nullable _treeIter;
    uint16_t _codesCount, _codesReceived;
    bool _currentIsExtendedLength, _skip;
    uint8_t *_Nullable _codesLengths;
    uint16_t _length;
    uint32_t _distance;
}
 
@property (readonly, nonatomic) uint32_t bytesConsumed;
 
- (instancetype)of_initWithStream: (OFStream *)stream
             distanceBits: (uint8_t)distanceBits
           dictionaryBits: (uint8_t)dictionaryBits;
@end
 
OF_ASSUME_NONNULL_END