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#include <stdio.h>
#include <dir.h>
unsigned char buffer[32768];

FILE* inf;
FILE* outf;

struct ffblk ffblk;
int done;
char tmpfname[] = "U2S.$$$";

main(int argc,char **argv)
{
int i;
unsigned numread;
char *p;

	if(argc > 1)
	{
		done = findfirst(argv[1],&ffblk,0);
		while (!done)
		{
			inf = fopen(ffblk.ff_name,"rb");
			outf = fopen(tmpfname,"wb");

			do {
				numread = fread(buffer,1,sizeof(buffer),inf);
				for(i = 0;i<numread;i++)
					buffer[i] = buffer[i] ^ 0x80;
				fwrite(buffer,1,numread,outf);
			} while(numread == sizeof(buffer));
			fclose(inf);
			fclose(outf);
			unlink(ffblk.ff_name);
			rename(tmpfname,ffblk.ff_name);
			unlink(tmpfname);
			done = findnext(&ffblk);
		}
	}
	else
	{
		printf("U2S converts signed samples to unsigned, or unsigned to signed\n");
		printf("usage: u2s <filename> (wildcards allowed)\n");
	}
}
.

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