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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * 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 General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef SCI_SCICORE_DECOMPRESSOR_H
+#define SCI_SCICORE_DECOMPRESSOR_H
+
+#include "common/file.h"
+
+namespace Sci {
+enum ResourceCompression {
+ kCompUnknown = -1,
+ kCompNone = 0,
+ kCompLZW,
+ kCompHuffman,
+ kComp3, // LZW-like compression used in SCI01 and SCI1
+ kComp3View, // Comp3 + view Post-processing
+ kComp3Pic, // Comp3 + pic Post-processing
+ kCompDCL,
+ kCompSTACpack // ? Used in SCI32
+};
+//----------------------------------------------
+// Base class for decompressors
+// Simply copies nPacked bytes from src to dest
+//----------------------------------------------
+class Decompressor {
+public:
+ Decompressor(){}
+ ~Decompressor(){}
+
+ //! get a number of bits from _src stream
+ /** @param n - number of bits to get
+ @return (uint32) n-bits number
+ */
+ virtual int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked);
+
+protected:
+ //! Initialize decompressor
+ /** @param src - source stream to read from
+ @param dest - destination stream to write to
+ @param nPacked - size of packed data
+ @param nUnpacket - size of unpacked data
+ @return (int) 0 on success, non-zero on error
+ */
+ virtual void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked); //! get one bit from _src stream
+ /** @return (bool) bit;
+ */
+ virtual bool getBit();
+ //! get a number of bits from _src stream
+ /** @param n - number of bits to get
+ @return (uint32) n-bits number
+ */
+ virtual uint32 getBits(int n);
+ //! put byte to _dest stream
+ /** @param b - byte to put
+ */
+ virtual void putByte(byte b);
+ virtual void fetchBits();
+
+ uint32 _dwBits;
+ byte _nBits;
+
+ uint32 _szPacked;
+ uint32 _szUnpacked;
+ uint32 _dwRead;
+ uint32 _dwWrote;
+
+ Common::ReadStream *_src;
+ Common::WriteStream *_dest;
+};
+
+//----------------------------------------------
+// Huffman decompressor
+//----------------------------------------------
+class DecompressorHuffman : public Decompressor {
+public:
+ int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked);
+
+protected:
+ int16 getc2();
+
+ byte *_nodes;
+};
+
+//----------------------------------------------
+// LZW-like decompressor for SCI01/SCI1
+// TODO: Needs clean-up of post-processing fncs
+//----------------------------------------------
+class DecompressorComp3 : public Decompressor {
+public:
+ DecompressorComp3(int nCompression) {
+ _compression = nCompression;
+ }
+ void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked);
+ int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked);
+
+protected:
+ // actual unpacking procedure
+ int doUnpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked);
+ // functions to post-process view and pic resources
+ void decode_rle(byte **rledata, byte **pixeldata, byte *outbuffer, int size);
+ int rle_size(byte *rledata, int dsize);
+ void pic_reorder(byte *inbuffer, byte *outbuffer, int dsize);
+ void build_cel_headers(byte **seeker, byte **writer, int celindex, int *cc_lengths, int max);
+ void view_reorder(byte *inbuffer, byte *outbuffer);
+
+ struct tokenlist {
+ byte data;
+ uint16 next;
+ } _tokens[0x1004];
+ byte _stak[0x1014];
+ byte _lastchar;
+ uint16 _stakptr;
+ uint16 _numbits, _lastbits;
+ uint16 _curtoken, _endtoken;
+ int _compression;
+};
+
+//----------------------------------------------
+// LZW 9-12 bits decompressor for SCI0
+// TODO : Needs clean-up of doUnpack()
+//----------------------------------------------
+class DecompressorLZW : public Decompressor {
+public:
+// void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked);
+ int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked);
+
+protected:
+ int doUnpack(byte *src, byte *dest, int length, int complength);
+
+};
+
+//----------------------------------------------
+// DCL decompressor for SCI1.1
+// TODO : Needs clean-up of doUnpack()
+//----------------------------------------------
+class DecompressorDCL : public Decompressor {
+public:
+// void init(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked, uint32 nUnpacked);
+ int unpack(Common::ReadStream *src, Common::WriteStream *dest, uint32 nPacked,
+ uint32 nUnpacked);
+
+protected:
+ int unpackDCL(byte *src, byte *dest, int length, int complength);
+ int getbits(struct bit_read_struct *inp, int bits);
+ int huffman_lookup(struct bit_read_struct *inp, int *tree);
+
+};
+
+} // End of namespace Sci
+
+#endif // SCI_SCICORE_DECOMPRESSOR_H \ No newline at end of file