Resource decompression functions moved to scicore\decompressor.cpp and turned into classes.

svn-id: r39311

1 files changed, 179 insertions, 0 deletions

diff --git a/engines/sci/scicore/decompressor.h b/engines/sci/scicore/decompressor.h
new file mode 100644
index 0000000000..3f8bd147c3
--- /dev/null
+++ b/engines/sci/scicore/decompressor.h
@@ -0,0 +1,179 @@
+/* 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
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