com.itextpdf.io.font.cmap.CMapByteCid Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
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or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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*/
package com.itextpdf.io.font.cmap;
import com.itextpdf.io.exceptions.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* @author psoares
*/
public class CMapByteCid extends AbstractCMap {
protected static class Cursor {
public int offset;
public int length;
public Cursor(int offset, int length) {
this.offset = offset;
this.length = length;
}
}
private List planes = new ArrayList<>();
public CMapByteCid() {
planes.add(new int[256]);
}
@Override
void addChar(String mark, CMapObject code) {
if (code.isNumber()) {
encodeSequence(decodeStringToByte(mark), (int) code.getValue());
}
}
/**
* Decode byte sequence.
*
* @param cidBytes byteCodeBytes
* @param offset number of bytes to skip before starting to return chars from the sequence
* @param length number of bytes to process
* @return string that contains decoded representation of the given sequence
*/
public String decodeSequence(byte[] cidBytes, int offset, int length) {
StringBuilder sb = new StringBuilder();
Cursor cursor = new Cursor(offset, length);
int cid;
while ((cid = decodeSingle(cidBytes, cursor)) >= 0) {
sb.append((char)cid);
}
return sb.toString();
}
protected int decodeSingle(byte[] cidBytes, Cursor cursor) {
int end = cursor.offset + cursor.length;
int currentPlane = 0;
while (cursor.offset < end) {
int one = cidBytes[cursor.offset++] & 0xff;
cursor.length--;
int[] plane = planes.get(currentPlane);
int cid = plane[one];
if ((cid & 0x8000) == 0) {
return cid;
} else {
currentPlane = cid & 0x7fff;
}
}
return -1;
}
private void encodeSequence(byte[] seq, int cid) {
int size = seq.length - 1;
int nextPlane = 0;
for (int idx = 0; idx < size; ++idx) {
int[] plane = planes.get(nextPlane);
int one = seq[idx] & 0xff;
int c = plane[one];
if (c != 0 && (c & 0x8000) == 0)
throw new IOException("Inconsistent mapping.");
if (c == 0) {
planes.add(new int[256]);
c = (planes.size() - 1 | 0x8000);
plane[one] = c;
}
nextPlane = c & 0x7fff;
}
int[] plane = planes.get(nextPlane);
int one = seq[size] & 0xff;
int c = plane[one];
if ((c & 0x8000) != 0)
throw new IOException("Inconsistent mapping.");
plane[one] = cid;
}
}