--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/goodjava/io/LimitedInputStream.java	Fri Apr 24 14:32:20 2020 -0600
@@ -0,0 +1,58 @@
+package goodjava.io;
+import java.io.InputStream;
+import java.io.FilterInputStream;
+import java.io.IOException;
+
+
+public final class LimitedInputStream extends FilterInputStream {
+	private final long limit;
+	private long pos = 0;
+
+	public LimitedInputStream(InputStream in, long limit) {
+		super(in);
+		this.limit = limit;
+	}
+
+	public synchronized int read() throws IOException {
+		if( pos >= limit )
+			return -1;
+		int n = super.read();
+		if( n != -1 )
+			pos++;
+		return n;
+	}
+
+	public synchronized int read(byte[] b, int off, int len) throws IOException {
+		long avail = limit - pos;
+		if( avail <= 0 )
+			return -1;
+		if( len > avail )
+			len = (int)avail;
+		int n = super.read(b,off,len);
+		if( n > 0 )
+			pos += n;
+		return n;
+	}
+
+	public synchronized long skip(long n) throws IOException {
+		long avail = limit - pos;
+		if( avail <= 0 )
+			return 0;
+		if( n > avail )
+			n = (int)avail;
+		n = super.skip(n);
+		pos += n;
+		return n;
+	}
+
+	public synchronized int available() throws IOException {
+		long avail = limit - pos;
+		if( avail <= 0 )
+			return 0;
+		int n = super.available();
+		if( n > avail )
+			n = (int)avail;
+		return n;
+	}
+
+}