3633a72547
git-svn-id: https://clonekeenplus.svn.sourceforge.net/svnroot/clonekeenplus/cgenius/trunk@82 4df4b0f3-56ce-47cb-b001-ed939b7d65a6
151 lines
2.2 KiB
C++
151 lines
2.2 KiB
C++
/*
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* lzexe.c
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*
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* Created on: 24.01.2009
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* Author: gerstrong
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*/
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#include <stdlib.h>
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#include <stdio.h>
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int get_bit(int *p_bit_count, FILE **fin)
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{
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static unsigned short bits;
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int bit;
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bit = bits & 1;
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(*p_bit_count)--;
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if ((*p_bit_count) <= 0)
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{
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bits = getc(*fin) | getc(*fin) << 8;
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if ((*p_bit_count) == -1) /* special case for first bit word */
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{
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bit = bits & 1;
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bits >>= 1;
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}
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(*p_bit_count) += 16;
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}
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else
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bits >>= 1;
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return bit;
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}
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int getEXEVersion(int episode, int bufsize)
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{
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switch (bufsize)
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{
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case 99762:
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if(episode != 1)
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return -1;
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else
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return 110;
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case 99972:
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if(episode != 1)
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return -1;
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else
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return 131;
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case 398:
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if(episode != 1)
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return -1;
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else
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return 134;
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case 118114:
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if(episode != 2)
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return -1;
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else
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return 100;
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case 118160:
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if(episode != 2)
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return -1;
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else
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return 131;
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case 127086:
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if(episode != 3)
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return -1;
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else
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return 100;
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case 127104:
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if(episode != 3)
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return -1;
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else
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return 131;
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default: return -2;
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}
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}
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// return how much was unpacked or zero if nothing was unpacked
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int unlzexe(FILE *fin, unsigned char *outbuffer)
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{
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int bit_count;
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short offset;
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int pos, repeat;
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pos = 0;
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bit_count = 0;
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/* skip header */
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fseek(fin, 32, SEEK_SET);
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while (1)
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{
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if (get_bit(&bit_count, &fin))
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{
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outbuffer[pos++] = getc(fin);
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}
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else
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{
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if (get_bit(&bit_count, &fin))
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{
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unsigned char tmp[2];
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fread(tmp, 1, 2, fin);
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repeat = (tmp[1] & 0x07);
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offset = ((tmp[1] & ~0x07) << 5) | tmp[0] | 0xE000;
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if (repeat == 0)
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{
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repeat = getc (fin);
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if (repeat == 0)
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break;
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else if (repeat == 1)
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continue;
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else
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repeat++;
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}
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else
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repeat += 2;
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}
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else
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{
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repeat = ((get_bit(&bit_count, &fin) << 1) | get_bit(&bit_count, &fin)) + 2;
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offset = getc(fin) | 0xFF00;
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}
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while (repeat > 0)
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{
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outbuffer[pos] = outbuffer[pos + offset];
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pos++;
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repeat--;
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}
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}
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}
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return pos;
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}
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