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//syx2bin.cpp
//converts an alesis hd24 .syx OS file to binary
using namespace std;
#include <iostream>
#define SKIPCHARS 9
int main(int argc, char *argv[])
{
FILE *pInfile;
FILE *pOutfile;
char *pInfilename, *pOutfilename;
int loop;
int msbits;
if(argc < 3)
{
fprintf(stderr, "Usage : %s infile outfile\n",argv[0]);
exit(1);
}
pInfilename = argv[1];
pOutfilename = argv[2];
pInfile = fopen(pInfilename, "rb");
if(!pInfile)
{
fprintf(stderr, "ERROR : couldn't open %s for reading\n", pInfilename);
exit(1);
}
pOutfile = fopen(pOutfilename, "wb");
if(!pOutfile)
{
fprintf(stderr, "ERROR : couldn't open %s for writing\n", pOutfilename);
fclose(pInfile); //close open infile
exit(1);
}
//skip F0 and 5 byte header
for(loop = 0; loop < SKIPCHARS; loop++)
{
fgetc(pInfile);
}
// msbits = fgetc(pInfile);
unsigned char b[8];
unsigned char header[64];
int whichbyte=3;
int headerbyte=0;
unsigned int checksum=0;
int filesize=0;
int written=0;
while((msbits != EOF) && (msbits != 0xF7)) //get most significant bits byte
{
int i;
int j;
j=10;
for (i=0;i<8;i++) {
b[i]=fgetc(pInfile);
if (b[i]==0xF7) {
msbits=0xF7;
j=i;
}
}
// convert 8->7 bytes
unsigned char bits=b[0];
int max=8;
if (j<max) { max=j; }
for (i=1;i<max;i++) {
#ifdef LSB
int onebit=(bits & 1) <<7;
b[i]|=onebit;
bits = (bits>>1);
#else
int onebit=(bits << 1) & 0x80;
b[i]|=onebit;
bits = (bits << 1);
#endif
fputc((unsigned char) b[i], pOutfile);
written++;
if (headerbyte<64) {
header[headerbyte]=b[i];
headerbyte++;
}
else
{
if (filesize==0) {
int x1=(int)((unsigned char)header[47]);
int x2=(int)((unsigned char)header[46]);
int x3=(int)((unsigned char)header[45]);
int x4=(int)((unsigned char)header[44]);
filesize=x1+(256*x2)+(256*256*x3)+(256*256*256*x4);
}
}
whichbyte=(whichbyte+1)%4;
checksum=(checksum+b[i] ) % 256;
//((unsigned char)(b[i]) << (8*(whichbyte))) ;
if (filesize!=0) {
if (written>=filesize) break;
}
}
if (filesize!=0) {
if (written>=filesize) break;
}
}
printf("Checksum=%x\n",checksum);
fclose(pInfile);
fclose(pOutfile);
return 0;
}
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