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engines/ultima/nuvie/files/u6_lzw.h

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef NUVIE_FILES_U6_LZW_H
+#define NUVIE_FILES_U6_LZW_H
+
+#include "ultima/shared/std/string.h"
+
+namespace Ultima {
+namespace Nuvie {
+
+class NuvieIOFileRead;
+
+// LZW Stack
+
+#define STACK_SIZE 10000
+
+class U6LzwStack {
+protected:
+	unsigned char stack[STACK_SIZE];
+	int contains;
+
+public:
+	U6LzwStack();
+
+	void reset(void);
+	bool is_empty(void);
+	bool is_full(void);
+	void push(unsigned char element);
+	unsigned char pop(void);
+	unsigned char gettop(void);
+};
+
+// LZW dictionary
+
+#define DICT_SIZE 10000
+
+typedef struct {
+	unsigned char root;
+	int codeword;
+	int contains;
+} dict_entry;
+
+class U6LzwDict {
+	dict_entry dict[DICT_SIZE];
+	int contains;
+
+public:
+
+	U6LzwDict();
+
+	void reset(void);
+	void add(unsigned char root, int codeword);
+	unsigned char get_root(int codeword) const;
+	int get_codeword(int codeword) const;
+};
+
+class U6Lzw {
+	U6LzwStack *stack;
+	U6LzwDict *dict;
+	const char *errstr; // error string
+public:
+
+	U6Lzw(void);
+	~U6Lzw(void);
+
+	unsigned char *decompress_buffer(unsigned char *source, uint32 source_length, uint32 &destination_length);
+	bool decompress_buffer(unsigned char *source, uint32 source_length, unsigned char *destination, uint32 destination_length);
+	unsigned char *decompress_file(const Common::Path &filename, uint32 &destination_length);
+	unsigned char *compress_buffer(unsigned char *src, uint32 src_len,
+	                               uint32 &dest_len);
+	const char *strerror() const {
+		return errstr;    // get error string
+	}
+protected:
+
+	bool is_valid_lzw_file(NuvieIOFileRead *input_file);
+	bool is_valid_lzw_buffer(unsigned char *buf, uint32 length);
+
+	long get_uncompressed_file_size(NuvieIOFileRead *input_file);
+	long get_uncompressed_buffer_size(unsigned char *buf, uint32 length);
+
+	int get_next_codeword(long *bits_read, unsigned char *source,
+	                      int codeword_size);
+	void output_root(unsigned char root, unsigned char *destination,
+	                 long *position);
+	void get_string(int codeword);
+};
+
+} // End of namespace Nuvie
+} // End of namespace Ultima
+
+#endif