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/**
* Copyright (c) 2005, www.fontbox.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of fontbox; 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 REGENTS 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.
*
* http://www.fontbox.org
*
*/
package com.itextpdf.text.pdf.fonts.cmaps;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Utilities;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfString;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import com.itextpdf.text.error_messages.MessageLocalization;
/**
* This class represents a CMap file.
*
* @author Ben Litchfield ([email protected])
* @since 2.1.4
*/
public class CMapToUnicode extends AbstractCMap {
private Map singleByteMappings = new HashMap();
private Map doubleByteMappings = new HashMap();
/**
* Creates a new instance of CMap.
*/
public CMapToUnicode() {
//default constructor
}
/**
* This will tell if this cmap has any one byte mappings.
*
* @return true If there are any one byte mappings, false otherwise.
*/
public boolean hasOneByteMappings() {
return !singleByteMappings.isEmpty();
}
/**
* This will tell if this cmap has any two byte mappings.
*
* @return true If there are any two byte mappings, false otherwise.
*/
public boolean hasTwoByteMappings() {
return !doubleByteMappings.isEmpty();
}
/**
* This will perform a lookup into the map.
*
* @param code The code used to lookup.
* @param offset The offset into the byte array.
* @param length The length of the data we are getting.
*
* @return The string that matches the lookup.
*/
public String lookup(byte[] code, int offset, int length) {
String result = null;
Integer key = null;
if (length == 1) {
key = Integer.valueOf(code[offset] & 0xff);
result = singleByteMappings.get(key);
} else if (length == 2) {
int intKey = code[offset] & 0xff;
intKey <<= 8;
intKey += code[offset + 1] & 0xff;
key = Integer.valueOf(intKey);
result = doubleByteMappings.get(key);
}
return result;
}
public Map createReverseMapping() throws IOException {
Map result = new HashMap();
for (Map.Entry entry : singleByteMappings.entrySet()) {
result.put(convertToInt(entry.getValue()), entry.getKey());
}
for (Map.Entry entry : doubleByteMappings.entrySet()) {
result.put(convertToInt(entry.getValue()), entry.getKey());
}
return result;
}
public Map createDirectMapping() throws IOException {
Map result = new HashMap();
for (Map.Entry entry : singleByteMappings.entrySet()) {
result.put(entry.getKey(), convertToInt(entry.getValue()));
}
for (Map.Entry entry : doubleByteMappings.entrySet()) {
result.put(entry.getKey(), convertToInt(entry.getValue()));
}
return result;
}
private int convertToInt(String s) throws IOException {
byte[] b = s.getBytes("UTF-16BE");
int value = 0;
for (int i = 0; i < b.length - 1; i++) {
value += b[i] & 0xff;
value <<= 8;
}
value += b[b.length - 1] & 0xff;
return value;
}
void addChar(int cid, String uni) {
doubleByteMappings.put(Integer.valueOf(cid), uni);
}
@Override
void addChar(PdfString mark, PdfObject code) {
try {
byte[] src = mark.getBytes();
String dest = createStringFromBytes(code.getBytes());
if (src.length == 1) {
singleByteMappings.put(Integer.valueOf(src[0] & 0xff), dest);
} else if (src.length == 2) {
int intSrc = src[0] & 0xFF;
intSrc <<= 8;
intSrc |= src[1] & 0xFF;
doubleByteMappings.put(Integer.valueOf(intSrc), dest);
} else {
throw new IOException(MessageLocalization.getComposedMessage("mapping.code.should.be.1.or.two.bytes.and.not.1", src.length));
}
}
catch (Exception ex) {
throw new ExceptionConverter(ex);
}
}
private String createStringFromBytes(byte[] bytes) throws IOException {
String retval = null;
if (bytes.length == 1) {
retval = new String(bytes);
} else {
retval = new String(bytes, "UTF-16BE");
}
return retval;
}
public static CMapToUnicode getIdentity() {
CMapToUnicode uni = new CMapToUnicode();
for (int i = 0; i < 65537; i++) {
uni.addChar(i, Utilities.convertFromUtf32(i));
}
return uni;
}
}
