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