mirror of
https://github.com/86Box/bios-tools.git
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93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/*
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* Copyright 2009 Luc Verhaegen <libv@skynet.be>
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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 2, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include "lzss_extract.h"
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static inline int
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LZSSBufferWrite(int fd, unsigned char *Buffer, int *BufferCount,
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unsigned char value)
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{
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Buffer[*BufferCount] = value;
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*BufferCount += 1;
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if (*BufferCount == 0x1000) {
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if (write(fd, Buffer, 0x1000) != 0x1000) {
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fprintf(stderr, "Error writing to output file: %s",
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strerror(errno));
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return 1;
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}
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*BufferCount = 0;
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}
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return 0;
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}
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int LZSSExtract(unsigned char *Input, int InputSize, int fd)
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{
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unsigned char Buffer[0x1000];
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unsigned short BitBuffer = 0;
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int i = 0, k, BitCount = 8, BufferCount = 0;
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while (i < InputSize) {
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if (BitCount == 8) {
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BitBuffer = Input[i];
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BitCount = -1;
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} else if ((BitBuffer >> BitCount) & 0x01) {
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if (LZSSBufferWrite(fd, Buffer, &BufferCount, Input[i]))
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return 1;
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} else if ((i + 1) < InputSize) {
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int offset =
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((Input[i] | ((Input[i + 1] & 0xF0) << 4)) -
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0xFEE) & 0xFFF;
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int length = (Input[i + 1] & 0x0F) + 3;
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for (k = 0; k < length; k++) {
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if (LZSSBufferWrite
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(fd, Buffer, &BufferCount,
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Buffer[(offset + k) & 0xFFF]))
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return 1;
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}
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i++;
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} else {
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fprintf(stderr,
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"Error: requesting data beyond end of input file.\n");
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return 1;
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}
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i++;
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BitCount++;
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}
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if (BufferCount) {
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if (write(fd, Buffer, BufferCount) != BufferCount) {
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fprintf(stderr, "Error writing to output file: %s",
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strerror(errno));
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return 1;
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}
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}
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return 0;
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}
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