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/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2020 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
* OF THIRD PARTY RIGHTS
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Utilities;
import com.itextpdf.text.pdf.fonts.otf.Language;
import com.itextpdf.text.pdf.languages.BanglaGlyphRepositioner;
import com.itextpdf.text.pdf.languages.GlyphRepositioner;
import com.itextpdf.text.pdf.languages.IndicCompositeCharacterComparator;
import java.io.UnsupportedEncodingException;
import java.util.*;
/**
* Each font in the document will have an instance of this class
* where the characters used will be represented.
*
* @author Paulo Soares
*/
class FontDetails {
/**
* The indirect reference to this font
*/
PdfIndirectReference indirectReference;
/**
* The font name that appears in the document body stream
*/
PdfName fontName;
/**
* The font
*/
BaseFont baseFont;
/**
* The font if it's an instance of TrueTypeFontUnicode
*/
TrueTypeFontUnicode ttu;
/**
* The font if it's an instance of CJKFont
*/
CJKFont cjkFont;
/**
* The array used with single byte encodings
*/
byte shortTag[];
/**
* The map used with double byte encodings. The key is Integer(glyph) and
* the value is int[]{glyph, width, Unicode code}
*/
HashMap longTag;
/**
* IntHashtable with CIDs of CJK glyphs that are used in the text.
*/
IntHashtable cjkTag;
/**
* The font type
*/
int fontType;
/**
* true if the font is symbolic
*/
boolean symbolic;
/**
* Indicates if only a subset of the glyphs and widths for that particular
* encoding should be included in the document.
*/
protected boolean subset = true;
/**
* Each font used in a document has an instance of this class.
* This class stores the characters used in the document and other
* specifics unique to the current working document.
* @param fontName the font name
* @param indirectReference the indirect reference to the font
* @param baseFont the BaseFont
*/
FontDetails(PdfName fontName, PdfIndirectReference indirectReference, BaseFont baseFont) {
this.fontName = fontName;
this.indirectReference = indirectReference;
this.baseFont = baseFont;
fontType = baseFont.getFontType();
switch (fontType) {
case BaseFont.FONT_TYPE_T1:
case BaseFont.FONT_TYPE_TT:
shortTag = new byte[256];
break;
case BaseFont.FONT_TYPE_CJK:
cjkTag = new IntHashtable();
cjkFont = (CJKFont)baseFont;
break;
case BaseFont.FONT_TYPE_TTUNI:
longTag = new HashMap();
ttu = (TrueTypeFontUnicode)baseFont;
symbolic = baseFont.isFontSpecific();
break;
}
}
/**
* Gets the indirect reference to this font.
* @return the indirect reference to this font
*/
PdfIndirectReference getIndirectReference() {
return indirectReference;
}
/**
* Gets the font name as it appears in the document body.
* @return the font name
*/
PdfName getFontName() {
return fontName;
}
/**
* Gets the BaseFont of this font.
* @return the BaseFont of this font
*/
BaseFont getBaseFont() {
return baseFont;
}
Object[] convertToBytesGid(String gids) {
if (fontType != BaseFont.FONT_TYPE_TTUNI)
throw new IllegalArgumentException("GID require TT Unicode");
try {
StringBuilder sb = new StringBuilder();
int totalWidth = 0;
for (char gid : gids.toCharArray()) {
int width = ttu.getGlyphWidth(gid);
totalWidth += width;
int vchar = ttu.GetCharFromGlyphId(gid);
if (vchar != 0) {
sb.append(Utilities.convertFromUtf32(vchar));
}
Integer gl = Integer.valueOf(gid);
if (!longTag.containsKey(gl))
longTag.put(gl, new int[]{gid, width, vchar});
}
return new Object[]{gids.getBytes(CJKFont.CJK_ENCODING), sb.toString(), Integer.valueOf(totalWidth)};
}
catch (Exception e) {
throw new ExceptionConverter(e);
}
}
/**
* Converts the text into bytes to be placed in the document.
* The conversion is done according to the font and the encoding and the characters
* used are stored.
* @param text the text to convert
* @return the conversion
*/
byte[] convertToBytes(String text) {
byte b[] = null;
switch (fontType) {
case BaseFont.FONT_TYPE_T3:
return baseFont.convertToBytes(text);
case BaseFont.FONT_TYPE_T1:
case BaseFont.FONT_TYPE_TT: {
b = baseFont.convertToBytes(text);
int len = b.length;
for (int k = 0; k < len; ++k)
shortTag[b[k] & 0xff] = 1;
break;
}
case BaseFont.FONT_TYPE_CJK: {
int len = text.length();
if (cjkFont.isIdentity()) {
for (int k = 0; k < len; ++k) {
cjkTag.put(text.charAt(k), 0);
}
}
else {
for (int k = 0; k < len; ++k) {
int val;
if (Utilities.isSurrogatePair(text, k)) {
val = Utilities.convertToUtf32(text, k);
k++;
}
else {
val = text.charAt(k);
}
cjkTag.put(cjkFont.getCidCode(val), 0);
}
}
b = cjkFont.convertToBytes(text);
break;
}
case BaseFont.FONT_TYPE_DOCUMENT: {
b = baseFont.convertToBytes(text);
break;
}
case BaseFont.FONT_TYPE_TTUNI: {
try {
int len = text.length();
int metrics[] = null;
char glyph[] = new char[len];
int i = 0;
if (symbolic) {
b = PdfEncodings.convertToBytes(text, "symboltt");
len = b.length;
for (int k = 0; k < len; ++k) {
metrics = ttu.getMetricsTT(b[k] & 0xff);
if (metrics == null)
continue;
longTag.put(Integer.valueOf(metrics[0]), new int[]{metrics[0], metrics[1], ttu.getUnicodeDifferences(b[k] & 0xff)});
glyph[i++] = (char)metrics[0];
}
} else if (canApplyGlyphSubstitution()) {
return convertToBytesAfterGlyphSubstitution(text);
} else {
for (int k = 0; k < len; ++k) {
int val;
if (Utilities.isSurrogatePair(text, k)) {
val = Utilities.convertToUtf32(text, k);
k++;
}
else {
val = text.charAt(k);
}
metrics = ttu.getMetricsTT(val);
if (metrics == null)
continue;
int m0 = metrics[0];
Integer gl = Integer.valueOf(m0);
if (!longTag.containsKey(gl))
longTag.put(gl, new int[]{m0, metrics[1], val});
glyph[i++] = (char)m0;
}
}
glyph = Utilities.copyOfRange(glyph, 0, i);
b = StringUtils.convertCharsToBytes(glyph);
}
catch (UnsupportedEncodingException e) {
throw new ExceptionConverter(e);
}
break;
}
}
return b;
}
private boolean canApplyGlyphSubstitution() {
return (fontType == BaseFont.FONT_TYPE_TTUNI) && (ttu.getGlyphSubstitutionMap() != null);
}
private byte[] convertToBytesAfterGlyphSubstitution(final String text) throws UnsupportedEncodingException {
if (!canApplyGlyphSubstitution()) {
throw new IllegalArgumentException("Make sure the font type if TTF Unicode and a valid GlyphSubstitutionTable exists!");
}
Map glyphSubstitutionMap = ttu.getGlyphSubstitutionMap();
// generate a regex from the characters to be substituted
// for Indic languages: push back the CompositeCharacters with smaller length
Set compositeCharacters = new TreeSet(new IndicCompositeCharacterComparator());
compositeCharacters.addAll(glyphSubstitutionMap.keySet());
// convert the text to a list of Glyph, also take care of the substitution
ArrayBasedStringTokenizer tokenizer = new ArrayBasedStringTokenizer(compositeCharacters.toArray(new String[0]));
String[] tokens = tokenizer.tokenize(text);
List glyphList = new ArrayList(50);
for (String token : tokens) {
// first check whether this is in the substitution map
Glyph subsGlyph = glyphSubstitutionMap.get(token);
if (subsGlyph != null) {
glyphList.add(subsGlyph);
} else {
// break up the string into individual characters
for (char c : token.toCharArray()) {
int[] metrics = ttu.getMetricsTT(c);
int glyphCode = metrics[0];
int glyphWidth = metrics[1];
glyphList.add(new Glyph(glyphCode, glyphWidth, String.valueOf(c)));
}
}
}
GlyphRepositioner glyphRepositioner = getGlyphRepositioner();
if (glyphRepositioner != null) {
glyphRepositioner.repositionGlyphs(glyphList);
}
char[] charEncodedGlyphCodes = new char[glyphList.size()];
// process each Glyph thus obtained
for (int i = 0; i < glyphList.size(); i++) {
Glyph glyph = glyphList.get(i);
charEncodedGlyphCodes[i] = (char) glyph.code;
Integer glyphCode = Integer.valueOf(glyph.code);
if (!longTag.containsKey(glyphCode)) {
// FIXME: this is buggy as the 3rd arg. should be a String as a Glyph can represent more than 1 char
longTag.put(glyphCode, new int[]{glyph.code, glyph.width, glyph.chars.charAt(0)});
}
}
return new String(charEncodedGlyphCodes).getBytes(CJKFont.CJK_ENCODING);
}
private GlyphRepositioner getGlyphRepositioner() {
Language language = ttu.getSupportedLanguage();
if (language == null) {
throw new IllegalArgumentException("The supported language field cannot be null in " + ttu.getClass().getName());
}
switch (language) {
case BENGALI:
return new BanglaGlyphRepositioner(Collections.unmodifiableMap(ttu.cmap31), ttu.getGlyphSubstitutionMap());
default:
return null;
}
}
/**
* Writes the font definition to the document.
* @param writer the PdfWriter of this document
*/
public void writeFont(PdfWriter writer) {
try {
switch (fontType) {
case BaseFont.FONT_TYPE_T3:
baseFont.writeFont(writer, indirectReference, null);
break;
case BaseFont.FONT_TYPE_T1:
case BaseFont.FONT_TYPE_TT: {
int firstChar;
int lastChar;
for (firstChar = 0; firstChar < 256; ++firstChar) {
if (shortTag[firstChar] != 0)
break;
}
for (lastChar = 255; lastChar >= firstChar; --lastChar) {
if (shortTag[lastChar] != 0)
break;
}
if (firstChar > 255) {
firstChar = 255;
lastChar = 255;
}
baseFont.writeFont(writer, indirectReference, new Object[]{Integer.valueOf(firstChar), Integer.valueOf(lastChar), shortTag, Boolean.valueOf(subset)});
break;
}
case BaseFont.FONT_TYPE_CJK:
baseFont.writeFont(writer, indirectReference, new Object[]{cjkTag});
break;
case BaseFont.FONT_TYPE_TTUNI:
baseFont.writeFont(writer, indirectReference, new Object[]{longTag, Boolean.valueOf(subset)});
break;
}
}
catch(Exception e) {
throw new ExceptionConverter(e);
}
}
/**
* Indicates if all the glyphs and widths for that particular
* encoding should be included in the document.
* @return false to include all the glyphs and widths.
*/
public boolean isSubset() {
return subset;
}
/**
* Indicates if all the glyphs and widths for that particular
* encoding should be included in the document. Set to false
* to include all.
* @param subset new value of property subset
*/
public void setSubset(boolean subset) {
this.subset = subset;
}
}
