// testForPDF.cpp : Check whether file is a PDF file
// returns 2 for error, 1 for "file is not PDF" and 0 for "file IS PDF"
//

#include "stdafx.h"
#include "stdio.h"
#include "string.h"

int main(int argc, char* argv[])
{
FILE * fp;
char buff[100];
int count;


    if (argc < 2 || argc > 2) {
		printf ("Usage: testForPDF filename\n");
		return 2;
	}
	fp = fopen(argv[1], "r");
	if (fp == (FILE *)NULL) {
		printf ("Failed to open file %s\n", argv[1]);
		return 2;
	}

    count = fread(buff, 1, 5, fp);
	buff[5] = (char)0;
    if (count < 5) {
		printf ("Failed to read 5 bytes from %s\n", argv[1]);
	}
	if (strcmp(buff, "%PDF-")) {
		/* printf ("File is NOT a PDF file - header is \"%s\"\n", buff); */
        return 1;
	}
	else {
		/* printf ("File is PDF - header is \"%s\"\n", buff); */
		return 0;
	}

	fclose (fp);
	return 0;
}