de.intarsys.pdf.font.StreamBasedGIDMap Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.font;

import de.intarsys.pdf.cos.COSObject;

/**
 * Mapping from CID's to glyph indices. The glyph index is a 2 byte value stored
 * at index 2*x and 2*x + 1 where x is the CID number. First byte is high order.
 */
public class StreamBasedGIDMap extends CIDToGIDMap {
	/**
	 * The meta class implementation
	 */
	public static class MetaClass extends CIDToGIDMap.MetaClass {
		protected MetaClass(Class instanceClass) {
			super(instanceClass);
		}
	}

	/** The meta class instance */
	public static final MetaClass META = new MetaClass(MetaClass.class
			.getDeclaringClass());

	/**
	 * @param object
	 */
	protected StreamBasedGIDMap(COSObject object) {
		super(object);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see de.intarsys.pdf.font.CIDToGIDMap#getGlyphIndex(de.intarsys.pdf.font.CID)
	 */
	@Override
	public int getGlyphIndex(CharacterSelector cid) {
		byte[] bytes = cosGetStream().getDecodedBytes();
		int index = cid.getValue() << 1;
		if (index < 0 || index + 1 >= bytes.length) {
			return 0;
		}
		int result = (bytes[index] & 0xff);
		result = (result << 8) + (bytes[index + 1] & 0xff);
		return result;
	}
}