com.lowagie.text.pdf.fonts.cmaps.CMap Maven / Gradle / Ivy
/**
* 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* http://www.fontbox.org
*
*/
package com.lowagie.text.pdf.fonts.cmaps;
import java.io.IOException;
import com.lowagie.text.error_messages.MessageLocalization;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This class represents a CMap file.
*
* @author Ben Litchfield ([email protected])
* @since 2.1.4
*/
public class CMap
{
private List codeSpaceRanges = new ArrayList<>();
private Map singleByteMappings = new HashMap<>();
private Map doubleByteMappings = new HashMap<>();
/**
* Creates a new instance of CMap.
*/
public CMap()
{
//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.
*
* Some characters (e.g. ligatures) decode to character sequences.
*
* @param code The code used to lookup.
* @return The string that matches the lookup.
*/
public String lookup(char code)
{
String result = null;
if (hasTwoByteMappings()) {
result = doubleByteMappings.get((int) code);
}
if (result == null && code <= 0xff && hasOneByteMappings()) {
result = singleByteMappings.get(code & 0xff);
}
return result;
}
/**
* 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 = code[offset] & 0xff;
result = singleByteMappings.get( key );
}
else if( length == 2 )
{
int intKey = code[offset] & 0xff;
intKey <<= 8;
intKey += code[offset+1] & 0xff;
key = intKey;
result = doubleByteMappings.get( key );
}
return result;
}
/**
* This will add a mapping.
*
* @param src The src to the mapping.
* @param dest The dest to the mapping.
*
* @throws IOException if the src is invalid.
*/
public void addMapping( byte[] src, String dest ) throws IOException
{
if( src.length == 1 )
{
singleByteMappings.put(src[0] & 0xff, dest );
}
else if( src.length == 2 )
{
int intSrc = src[0]&0xFF;
intSrc <<= 8;
intSrc |= (src[1]&0xFF);
doubleByteMappings.put(intSrc, dest );
}
else
{
throw new IOException(MessageLocalization.getComposedMessage("mapping.code.should.be.1.or.two.bytes.and.not.1", src.length));
}
}
/**
* This will add a codespace range.
*
* @param range A single codespace range.
*/
public void addCodespaceRange( CodespaceRange range )
{
codeSpaceRanges.add( range );
}
/**
* Getter for property codeSpaceRanges.
*
* @return Value of property codeSpaceRanges.
*/
public List getCodeSpaceRanges()
{
return codeSpaceRanges;
}
}