112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef NUVIE_FILES_U6_LZW_H
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#define NUVIE_FILES_U6_LZW_H
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#include "ultima/shared/std/string.h"
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namespace Ultima {
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namespace Nuvie {
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class NuvieIOFileRead;
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// LZW Stack
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#define STACK_SIZE 10000
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class U6LzwStack {
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protected:
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unsigned char stack[STACK_SIZE];
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int contains;
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public:
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U6LzwStack();
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void reset(void);
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bool is_empty(void);
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bool is_full(void);
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void push(unsigned char element);
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unsigned char pop(void);
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unsigned char gettop(void);
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};
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// LZW dictionary
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#define DICT_SIZE 10000
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typedef struct {
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unsigned char root;
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int codeword;
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int contains;
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} dict_entry;
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class U6LzwDict {
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dict_entry dict[DICT_SIZE];
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int contains;
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public:
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U6LzwDict();
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void reset(void);
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void add(unsigned char root, int codeword);
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unsigned char get_root(int codeword) const;
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int get_codeword(int codeword) const;
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};
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class U6Lzw {
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U6LzwStack *stack;
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U6LzwDict *dict;
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const char *errstr; // error string
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public:
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U6Lzw(void);
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~U6Lzw(void);
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unsigned char *decompress_buffer(unsigned char *source, uint32 source_length, uint32 &destination_length);
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bool decompress_buffer(unsigned char *source, uint32 source_length, unsigned char *destination, uint32 destination_length);
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unsigned char *decompress_file(const Common::Path &filename, uint32 &destination_length);
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unsigned char *compress_buffer(unsigned char *src, uint32 src_len,
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uint32 &dest_len);
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const char *strerror() const {
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return errstr; // get error string
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}
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protected:
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bool is_valid_lzw_file(NuvieIOFileRead *input_file);
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bool is_valid_lzw_buffer(unsigned char *buf, uint32 length);
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long get_uncompressed_file_size(NuvieIOFileRead *input_file);
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long get_uncompressed_buffer_size(unsigned char *buf, uint32 length);
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int get_next_codeword(long *bits_read, unsigned char *source,
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int codeword_size);
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void output_root(unsigned char root, unsigned char *destination,
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long *position);
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void get_string(int codeword);
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};
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} // End of namespace Nuvie
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} // End of namespace Ultima
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#endif
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