org.apache.fontbox.cmap.CIDRange Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.fontbox.cmap;
/**
* Range of continuous CIDs between two Unicode characters.
*/
class CIDRange
{
private final char from;
private char to;
private final int cid;
CIDRange(char from, char to, int cid)
{
this.from = from;
this.to = to;
this.cid = cid;
}
/**
* Maps the given Unicode character to the corresponding CID in this range.
*
* @param ch Unicode character
* @return corresponding CID, or -1 if the character is out of range
*/
public int map(char ch)
{
if (from <= ch && ch <= to)
{
return cid + (ch - from);
}
return -1;
}
/**
* Maps the given CID to the corresponding Unicode character in this range.
*
* @param code CID
* @return corresponding Unicode character, or -1 if the CID is out of range
*/
public int unmap(int code)
{
if (cid <= code && code <= cid + (to - from))
{
return from + (code - cid);
}
return -1;
}
/**
* Check if the given values represent a consecutive range of the given range. If so, extend the given range instead
* of creating a new one.
*
* @param newFrom start value of the new range
* @param newTo end value of the new range
* @param newCid start CID value of the range
* @return true if the given range was extended
*/
public boolean extend(char newFrom, char newTo, int newCid)
{
if ((newFrom == to + 1) && (newCid == cid + to - from + 1))
{
to = newTo;
return true;
}
return false;
}
}