
ru.sbtqa.monte.media.io.UncachedImageInputStream Maven / Gradle / Ivy
/* @(#)UncachedImageInputStream.java
* Copyright © 2011 Werner Randelshofer, Switzerland.
* You may only use this software in accordance with the license terms.
*/
package ru.sbtqa.monte.media.io;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteOrder;
import static java.nio.ByteOrder.BIG_ENDIAN;
/**
* An implementation of {@code ImageInputStream} that gets its input from a
* regular {@code InputStream}. No caching is used and thus backward seeking is
* not supported.
*
* @author Werner Randelshofer
* @version $Id: UncachedImageInputStream.java 364 2016-11-09 19:54:25Z werner $
*/
public class UncachedImageInputStream extends ImageInputStreamImpl2 {
private InputStream in;
public UncachedImageInputStream(InputStream in) {
this(in, BIG_ENDIAN);
}
public UncachedImageInputStream(InputStream in, ByteOrder bo) {
this.in = in;
this.byteOrder = bo;
}
@Override
public int read() throws IOException {
int b = in.read();
if (b >= 0) {
streamPos++;
}
return b;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int count = in.read(b, off, len);
if (count > 0) {
streamPos += count;
}
return count;
}
@Override
public void seek(long pos) throws IOException {
checkClosed();
// This test also covers pos < 0
if (pos < flushedPos) {
throw new IndexOutOfBoundsException("pos < flushedPos!");
}
if (pos < streamPos) {
throw new IndexOutOfBoundsException("pos < streamPos!");
}
this.bitOffset = 0;
while (streamPos < pos) {
long skipped = in.skip(pos - streamPos);
if (skipped < 0) {
throw new EOFException("EOF reached while trying to seek to " + pos);
}
streamPos += skipped;
}
}
}
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