This works with dev-cpp and win64:
/* LZ48 simple C source file / crappy version by roudoudou - Flower Corp. 2016 */
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<malloc.h>
int LZ48_encode_extended_length(unsigned char *odata, int length) {
int ioutput=0;
while (length>=255) {
odata[ioutput++]=0xFF;
length-=255;
}
/* if the last value is 255 we must encode 0 to end extended length */
odata[ioutput++]=length;
return ioutput;
}
int LZ48_encode_block(unsigned char *odata,unsigned char *data, int literaloffset,int literalcpt,int offset,int maxlength) {
int ioutput=1;
int token=0;
int i;
if (offset<0 || offset>255) {
fprintf(stderr,"internal offset error!");
exit(-2);
}
if (literalcpt<15) {
token=literalcpt<<4;
} else {
token=0xF0;
ioutput+=LZ48_encode_extended_length(odata+ioutput,literalcpt-15);
}
for (i=0; i<literalcpt; i++) odata[ioutput++]=data[literaloffset++];
if (maxlength<18) {
if (maxlength>2) {
token|=(maxlength-3);
} else {
/* endoffset has no length */
}
} else {
token|=0xF;
ioutput+=LZ48_encode_extended_length(odata+ioutput,maxlength-18);
}
odata[ioutput++]=offset-1;
odata[0]=token;
return ioutput;
}
unsigned char *LZ48_encode(unsigned char *data, int length, int *retlength) {
int i,startscan,current=1,token,ioutput=1,curscan;
int maxoffset,maxlength,matchlength,literal=0,literaloffset=1;
unsigned char *odata=NULL;
if (!length) return NULL;
odata=(unsigned char*) malloc(length*1.1);
if (!odata) {
fprintf(stderr,"memory full");
exit(-1);
}
/* first byte always literal */
odata[0]=data[0];
/* force short data encoding */
if (length<5) {
token=(length-1)<<4;
odata[ioutput++]=token;
for (i=1; i<length; i++) odata[ioutput++]=data[current++];
odata[ioutput++]=0xFF;
*retlength=ioutput;
return odata;
}
while (current<length) {
maxlength=0;
startscan=current-255;
if (startscan<0) startscan=0;
while (startscan<current) {
matchlength=0;
curscan=current;
for (i=startscan; curscan<length; i++) {
if (data[i]==data[curscan++]) matchlength++;
else break;
}
if (matchlength>=3 && matchlength>maxlength) {
maxoffset=startscan;
maxlength=matchlength;
}
startscan++;
}
if (maxlength) {
ioutput+=LZ48_encode_block(odata+ioutput,data,literaloffset,literal,current-maxoffset,maxlength);
current+=maxlength;
literaloffset=current;
literal=0;
} else {
literal++;
current++;
}
}
ioutput+=LZ48_encode_block(odata+ioutput,data,literaloffset,literal,0,0);
*retlength=ioutput;
return odata;
}
void LZ48_decode(unsigned char *data, unsigned char *odata) {
int HL=0,DE=0;
int literallength,matchlength,HLmatch;
odata[DE++]=data[HL++];
while (1) {
literallength=(data[HL] & 0xF0)>>4;
matchlength=(data[HL++] & 0xF);
if (literallength==15) {
while (data[HL]==255) {
literallength+=255;
HL++;
}
literallength+=data[HL++];
}
while (literallength>0) {
odata[DE++]=data[HL++];
literallength--;
}
/* matchkey */
if (matchlength==15) {
while (data[HL]==255) {
matchlength+=255;
HL++;
}
matchlength+=data[HL++];
}
matchlength+=3;
if (data[HL]==0xFF) return;
else HLmatch=DE-(data[HL++]+1);
while (matchlength) {
odata[DE++]=odata[HLmatch++];
matchlength--;
}
}
}
unsigned char * LZ48_decrunch(unsigned char *data, int *osize) {
int literallength,matchlength;
int HL=1,DE=1;
unsigned char *odata=NULL;
while (1) {
literallength=(data[HL] & 0xF0)>>4;
matchlength=(data[HL++] & 0xF);
if (literallength==15) {
while (data[HL]==255) {
literallength+=255;
HL++;
}
literallength+=data[HL++];
}
DE+=literallength;
HL+=literallength;
/* matchkey */
if (matchlength==15) {
while (data[HL]==255) {
matchlength+=255;
HL++;
}
matchlength+=data[HL++];
}
matchlength+=3;
if (data[HL]==0xFF) break;
else HL++;
DE+=matchlength;
}
*osize=DE;
odata=(unsigned char*)malloc(*osize);
if (!odata) {
fprintf(stderr,"memory full\n");
exit(-1);
}
LZ48_decode(data,odata);
return odata;
}
void Usage() {
printf("usage: lz48 <options>\n");
printf("options are:\n");
printf("-i <inputfile>\n");
printf("-o <outputfile>\n");
printf("-b hexatext output (enable if you forget outputfile)\n");
printf("-d decrunch\n");
printf("\n");
exit(0);
}
int ParseOptions(char **argv,int argc, char **inputfilename, char **outputfilename, int *hexoutput, int *crunch) {
int i=0;
if (argv[i][0]=='-') {
switch(argv[i][1]) {
case 'O':
case 'o':
if (i+1<argc) *outputfilename=argv[i+1];
i++;
break;
case 'I':
case 'i':
if (i+1<argc) *inputfilename=argv[i+1];
i++;
break;
case 'D':
case 'd':
*crunch=0;
break;
case 'B':
case 'b':
*hexoutput=1;
break;
default:
Usage();
}
} else
Usage();
return i;
}
/*
* GetParametersFromCommandLine
* retrieve parameters from command line and fill pointers to file names
* */
void GetParametersFromCommandLine(int argc, char **argv, char **inputfilename, char **outputfilename, int *hexoutput, int *crunch) {
#undef FUNC
#define FUNC "GetParametersFromCommandLine"
int i;
for (i=1; i<argc; i++)
i+=ParseOptions(&argv[i],argc-i,inputfilename,outputfilename,hexoutput,crunch);
if (!*inputfilename) Usage();
if (!*outputfilename) *hexoutput=1;
}
int main(int argc, char **argv) {
unsigned char *data=NULL,*newdata=NULL;
char *inputfilename=NULL,*outputfilename=NULL;
int hexoutput=0,isize,crunch=1;
int newsize,i,cr;
FILE *fin=NULL,*fout=stdout;
fprintf(stderr,"LZ48 cruncher / roudoudou - Flower Corp. 2016\n");
GetParametersFromCommandLine(argc,argv,&inputfilename,&outputfilename,&hexoutput,&crunch);
fin=fopen(inputfilename,"rb");
if (!fin) Usage();
fseek(fin,0,SEEK_END);
isize=ftell(fin);
fseek(fin,0,SEEK_SET);
data=(unsigned char*) malloc(isize);
if (!data) {
fprintf(stderr,"memory full\n");
exit(-1);
}
if (fread(data,1,isize,fin)!=isize) {
fprintf(stderr,"read error\n");
exit(-1);
}
fclose(fin);
switch (crunch) {
case 0:
newdata=LZ48_decrunch(data,&newsize);
break;
case 1:
newdata=LZ48_encode(data,isize,&newsize);
break;
}
printf("input: %d output: %d\n",isize,newsize);
if (hexoutput) {
for (i=cr=0; i<newsize; i++) {
if (!cr) {
printf("DEFB %02X",newdata[i]);
cr=1;
} else {
if (cr==15) {
printf(",%02X\n",newdata[i]);
cr=0;
} else {
printf(",%02X",newdata[i]);
cr++;
}
}
}
if (cr) printf("\n");
} else {
fout=fopen(outputfilename,"wb");
if (!fout) Usage;
if (fwrite(newdata,1,newsize,fout)!=newsize) {
fprintf(stderr,"write error\n");
exit(-1);
}
fclose(fout);
}
return 0;
}
