mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-09-09 02:54:25 +00:00
155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/* code by qkumba */
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#include <stdio.h>
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#include <unistd.h>
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#define OFFSET 32
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#define OFFSET2 35
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//#define OFFSET 35
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#define END_AT_3F5 0
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#define BEGIN_AT_3F5 1
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int main(int argc, char **argv) {
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// int mode=END_AT_3F5;
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int mode=BEGIN_AT_3F5;
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int i = 0;
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int e = 0,filesize;
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int val,pv,final;
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unsigned char in[1024];
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unsigned char enc[1024],enc2[1024];
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int third,enc_ptr=0;
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// printf("1REM");
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filesize=read(0,in,1024);
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do {
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third = ((in[i + 2] & 3) << 4) +
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((in[i + 1] & 3) << 2) + (in[i + 0] & 3);
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enc[e++]=third+OFFSET2;
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if (i<filesize) {
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val=in[i+0];
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pv=val;
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val=val+0x40;
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val-=third;
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// val&=0xff;
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val=val>>2;
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val=val+OFFSET;
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final=((val-OFFSET)<<2)+third-0x40;
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fprintf(stderr,"%d: %x -> %x %x ==> %x\n",
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i,pv,val,third,final);
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if (pv!=final) fprintf(stderr,"error0: no match!\n");
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if (val<0) fprintf(stderr,"error0, negative! in=%x e=%x val=%x\n",
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in[i+0],third,val);
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if (val<0x20) fprintf(stderr,"error0, unprintable! in=%x pv=%x e=%x val=%x\n",
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in[i+0],pv,third,val);
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if (val>0x7e) fprintf(stderr,"error0, too big! in=%x pv=%x e=%x val=%x\n",
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in[i+0],pv,third,val);
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// printf("%c",val); //(in[i + 0] >> 2) + OFFSET);
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//printf("%c",val); //(in[i + 0] >> 2) + OFFSET);
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enc2[enc_ptr]=val;
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enc_ptr++;
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}
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if (i + 1 < filesize) {
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val=in[i+1];
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pv=val;
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val=val+0x40;
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val-=(third>>2);
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// val&=0xff;
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val=val>>2;
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val=val+OFFSET;
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final=((val-OFFSET)<<2)+(third>>2)-0x40;
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fprintf(stderr,"%d: %x -> %x %x ==> %x\n",
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i+1,pv,val,third>>2,final);
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if (pv!=final) fprintf(stderr,"error1: no match!\n");
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if (val<0) fprintf(stderr,"error1, negative! %x %x\n",
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in[i+0]&0xfc,third);
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if (val<0x20) fprintf(stderr,"error1, unprintable! %x %x\n",
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in[i+0]&0xfc,third);
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if (val>0x7e) fprintf(stderr,"error1, too big! in=%x pv=%x e=%x val=%x\n",
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in[i+0],pv,third,val);
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// printf("%c",val); //(in[i + 1] >> 2) + OFFSET);
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enc2[enc_ptr]=val;
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enc_ptr++;
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}
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if (i + 2 < filesize) {
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val=in[i+2];
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pv=val;
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val=val+0x40;
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val-=(third>>4);
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// val&=0xff;
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val=val>>2;
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val=val+OFFSET;
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final=((val-OFFSET)<<2)+(third>>4)-0x40;
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fprintf(stderr,"%d: %x -> %x %x ==> %x\n",
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i+2,pv,val,third>>4,final);
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if (pv!=final) fprintf(stderr,"error2: no match!\n");
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if (val<0) fprintf(stderr,"error2, negative! %x %x\n",
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in[i+0]&0xfc,third);
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if (val<0x20) fprintf(stderr,"error2, unprintable! %x %x\n",
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in[i+0]&0xfc,third);
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if (val>0x7e) fprintf(stderr,"error2 too big! in=%x pv=%x e=%x val=%x\n",
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in[i+0],pv,third,val);
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// printf("%c",val);//(in[i + 2] >> 2) + OFFSET);
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enc2[enc_ptr]=val;
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enc_ptr++;
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}
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} while ((i += 3) < filesize);
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enc[e]=0;
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enc2[enc_ptr]=0;
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// from Tom Greene @txgx42
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// $850 = 2128
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// with call
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#if 0
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printf("1FORI=0TO%d:POKE768+I,4*PEEK(%d+I)-"
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"192+(PEEK(%d+I/3)-%d)/4^(I-INT(I/3)*3):NEXT\n",
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filesize-1,2128,2128+filesize,OFFSET2);
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printf("2CALL768\"%s%s\n",enc2,enc);
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#endif
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if (mode==END_AT_3F5) {
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fprintf(stderr,"Ending at $3F5\n");
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printf("1FORI=0TO%d:POKE%d+I,4*PEEK(%d+I)-"
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"192+(PEEK(%d+I/3)-%d)/4^(I-INT(I/3)*3):NEXT\n",
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filesize-1,
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0x3f5-filesize+3,
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2125,2125+filesize,OFFSET2);
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printf("2&\"%s%s\n",enc2,enc);
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}
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// if using & to jump to beginning (over-writing text page)
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if (mode==BEGIN_AT_3F5) {
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fprintf(stderr,"Beginning at $3F5\n");
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printf("1FORI=0TO%d:POKE%d+I,4*PEEK(%d+I)-"
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"192+(PEEK(%d+I/3)-%d)/4^(I-INT(I/3)*3):NEXT\n",
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filesize-1,
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0x3f5,
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2126,2126+filesize,OFFSET2);
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printf("2&\"%s%s\n",enc2,enc);
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}
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// printf("%s\n",enc);
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// printf("2FORI=0TO%d:POKE768+I,4*PEEK(2054+I)-"
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// "192+(PEEK(%d+I/3)-32)/4^(I-INT(I/3)*3):NEXT:CALL768\n",
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// filesize,2054+filesize);
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// printf("2FORI=0TO%d:C=(PEEK(%d+I/3)-32)/4^(I-INT(I/3)*3):POKE768+I,C+4*(PEEK(2054+I)-32-INT(C/4)):NEXT:CALL768\n",
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// filesize,2054+filesize);
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// note, peek/poke truncate?
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//2FORI=1013TO1141:C=(PEEK(1843+I/3)-32)/4^(I-INT(I/3)*3):POKEI,C+4*(PEEK(1041+I)-32-INT(C/4)):NEXT:&
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return 0;
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}
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