org.jpedal.fonts.Dict Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin
There is a newer version: 7.15.25
/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * Dict.java
 * ---------------
 */
package org.jpedal.fonts;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

public class Dict {

	private int pos;
	private final byte[] data;
	public LinkedHashMap entries = new LinkedHashMap();

	public Dict privateDict;
	public Dict[] fontDicts;
	public byte[][] subrsIndexData;
	public int ascent = 1000;
	public int descent;
	public int[] widths;
	public CIDCharset charset;
	public CIDEncoding encoding;
	public CIDFDSelect fdSelect;

	public LinkedHashMap trackers = new LinkedHashMap();

	Dict(final byte[] data) {
		List operands = new ArrayList();
		this.data = data;
		final int end = data.length;
		while (pos < end) {
			int b = data[pos] & 0xff;
			if (b <= 21) {
				if (b == 12) {
					b = (b << 8) | (data[++pos] & 0xff);
				}
				Number[] operandsArr = new Number[operands.size()];
				operandsArr = operands.toArray(operandsArr);
				entries.put(b, operandsArr);
				operands = new ArrayList();
				++pos;
			} else {
				operands.add(parseOperand());
			}
		}
	}

	private Number parseOperand() {
		int value = data[pos++] & 0xff;
		if (value == 30) {
			return parseFloatOperand();
		} else if (value == 28) {
			value = data[pos++] & 0xff;
			value = ((value << 24) | ((data[pos++] & 0xff) << 16)) >> 16;
			return value;
		} else if (value == 29) {
			value = data[pos++] & 0xff;
			value = (value << 8) | (data[pos++] & 0xff);
			value = (value << 8) | (data[pos++] & 0xff);
			value = (value << 8) | (data[pos++] & 0xff);
			return value;
		} else if (value >= 32 && value <= 246) {
			return value - 139;
		} else if (value >= 247 && value <= 250) {
			return ((value - 247) * 256) + (data[pos++] & 0xff) + 108;
		} else if (value >= 251 && value <= 254) {
			return -((value - 251) * 256) - (data[pos++] & 0xff) - 108;
		}
		return null;
	}

	private float parseFloatOperand() {
		final StringBuilder str = new StringBuilder();
		final int eof = 15;
		final String[] lookup = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ".", "E", "E-", null, "-"};
		final int length = data.length;
		while (pos < length) {
			final int b = data[pos++] & 0xff;
			final int b1 = b >> 4;
			final int b2 = b & 15;

			if (b1 == eof) {
				break;
			}
			str.append(lookup[b1]);

			if (b2 == eof) {
				break;
			}
			str.append(lookup[b2]);
		}
		String res = str.toString();
			
		if (res.isEmpty()) {
			return 0;
		} else if (res.startsWith("E")) {
			res = "1" + res;
		}
		return Float.parseFloat(res);
	}

}