org.eclipse.swt.internal.image.TIFFRandomFileAccess Maven / Gradle / Ivy

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The osx x86_64 swt jar as available in the Eclipse 4.6 (Neon) release for OSX. It is suitable for use with jface and other dependencies available from maven central in the org.eclipse.scout.sdk.deps group. The sources is copied from swt-4.6-cocoa-macosx-x86_64.zip from http://download.eclipse.org/eclipse/downloads/drops4/R-4.6-201606061100/ and javadoc is generated from sources.

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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.internal.image;

import java.io.*;

final class TIFFRandomFileAccess {

	LEDataInputStream inputStream;
	int start, current, next;
	byte[][] buffers;

	static final int CHUNK_SIZE = 8192;
	static final int LIST_SIZE = 128;

public TIFFRandomFileAccess(LEDataInputStream stream) {
	inputStream = stream;
	start = current = next = inputStream.getPosition();
	buffers = new byte[LIST_SIZE][];
}

void seek(int pos) throws IOException {
	if (pos == current) return;
	if (pos < start) throw new IOException();
	current = pos;
	if (current > next) {
		int n = current - next;
		/* store required bytes */
		int index = next / CHUNK_SIZE;
		int offset = next % CHUNK_SIZE;
		while (n > 0) {
			if (index >= buffers.length) {
				byte[][] oldBuffers = buffers;
				buffers = new byte[Math.max(index + 1, oldBuffers.length + LIST_SIZE)][];
				System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length);
			}
			if (buffers[index] == null) buffers[index] = new byte[CHUNK_SIZE];
			int cnt = inputStream.read(buffers[index], offset, Math.min(n, CHUNK_SIZE - offset));
			n -= cnt;
			next += cnt;
			index++;
			offset = 0;
		}
	}
}

void read(byte b[]) throws IOException {
	int size = b.length;
	int nCached = Math.min(size, next - current);
	int nMissing = size - next + current;
	int destNext = 0;
	if (nCached > 0) {
		/* Get cached bytes */
		int index = current / CHUNK_SIZE;
		int offset = current % CHUNK_SIZE;
		while (nCached > 0) {
			int cnt = Math.min(nCached, CHUNK_SIZE - offset);
			System.arraycopy(buffers[index], offset, b, destNext, cnt);
			nCached -= cnt;
			destNext += cnt;
			index++;
			offset = 0;
		}
	}
	if (nMissing > 0) {
		/* Read required bytes */
		int index = next / CHUNK_SIZE;
		int offset = next % CHUNK_SIZE;
		while (nMissing > 0) {
			if (index >= buffers.length) {
				byte[][] oldBuffers = buffers;
				buffers = new byte[Math.max(index, oldBuffers.length + LIST_SIZE)][];
				System.arraycopy(oldBuffers, 0, buffers, 0, oldBuffers.length);
			}
			if (buffers[index] == null) buffers[index] = new byte[CHUNK_SIZE];
			int cnt = inputStream.read(buffers[index], offset, Math.min(nMissing, CHUNK_SIZE - offset));
			System.arraycopy(buffers[index], offset, b, destNext, cnt);
			nMissing -= cnt;
			next += cnt;
			destNext += cnt;
			index++;
			offset = 0;
		}
	}
	current += size;
}

}