mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-26 00:29:29 +00:00
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
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/* code by qkumba */
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#include <stdio.h>
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#include <unistd.h>
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int main(int argc, char **argv) {
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int i = 0;
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int e = 0,filesize;
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int val,pv;
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unsigned char in[1024];
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unsigned char enc[1024];
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int third;
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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+32;
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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+0x100;
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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+32;
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fprintf(stderr,"%d: %x -> %x %x ==> %x\n",
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i,pv,val,third,((val-32)<<2)+third);
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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) + 32);
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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+0x100;
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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+32;
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fprintf(stderr,"%d: %x -> %x %x ==> %x\n",
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i+1,pv,val,third>>2,((val-32)<<2)+(third>>2));
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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) + 32);
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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+0x100;
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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+32;
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fprintf(stderr,"%d: %x -> %x %x ==> %x\n",
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i+2,pv,val,third>>4,((val-32)<<2)+(third>>4));
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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) + 32);
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}
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} while ((i += 3) < filesize);
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enc[e]=0;
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printf("%s\n",enc);
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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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