package com.macfaq.io;
import java.io.*;
public class PrintableInputStream extends FilterInputStream {
public PrintableInputStream(InputStream in) {
super(in);
}
public int read() throws IOException {
int b = in.read();
// printing, ASCII characters
if (b >= 32 && b <= 126) return b;
// carriage return, linefeed, tab, and end of file
else if (b == 10 || b == 13 || b == 9 || b == -1) return b;
// non-printing characters
else return '?';
}
public int read(byte[] data, int offset, int length) throws IOException {
int result = in.read(data, offset, length);
for (int i = offset; i < offset+result; i++) {
// do nothing with the printing characters
// carriage return, linefeed, tab, and end of file
if (data[i] == 10 || data[i] == 13 || data[i] == 9 || data[i] == -1) ;
// non-printing characters
else if (data[i] < 32 || data[i] > 126) data[i] = (byte) '?';
}
return result;
}
// test the stream
public static void main (String[] args) throws IOException {
for (int i = 0; i < args.length; i++) {
FileInputStream fin = new FileInputStream(args[i]);
PrintableInputStream pin = new PrintableInputStream(fin);
while (true) {
int c = pin.read();
if (c == -1) break;
System.out.write(c);
}
}
}
}
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