iText io.jar Source Code
io.jar is a component in iText Java library to provide input/output functionalities.
iText Java library allows you to generate and manage PDF documents.
The Source Code files are provided together with the JAR file in the binary packge like iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.
You can compile it to generate your JAR file, using io.pom as the build configuration file.
The source code of io-7.1.4.jar is provided below:
✍: FYIcenter.com
⏎ com/itextpdf/io/font/TrueTypeFontSubset.java
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2018 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: sales@itextpdf.com
*/
package com.itextpdf.io.font;
import com.itextpdf.io.IOException;
import com.itextpdf.io.source.RandomAccessFileOrArray;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Subsets a True Type font by removing the unneeded glyphs from the font.
*
* @author Paulo Soares
*/
class TrueTypeFontSubset {
static final String[] tableNamesSimple = {"cvt ", "fpgm", "glyf", "head", "hhea", "hmtx", "loca", "maxp", "prep"};
static final String[] tableNamesCmap = {"cmap", "OS/2"};
static final String[] tableNamesExtra = {"cmap", "OS/2", "name", "post"};
static final int[] entrySelectors = {0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4};
static final int TABLE_CHECKSUM = 0;
static final int TABLE_OFFSET = 1;
static final int TABLE_LENGTH = 2;
static final int HEAD_LOCA_FORMAT_OFFSET = 51;
static final int ARG_1_AND_2_ARE_WORDS = 1;
static final int WE_HAVE_A_SCALE = 8;
static final int MORE_COMPONENTS = 32;
static final int WE_HAVE_AN_X_AND_Y_SCALE = 64;
static final int WE_HAVE_A_TWO_BY_TWO = 128;
/**
* Contains the location of the several tables. The key is the name of
* the table and the value is an {@code int[3]} where position 0
* is the checksum, position 1 is the offset from the start of the file
* and position 2 is the length of the table.
*/
protected Map<String, int[]> tableDirectory;
/**
* The file in use.
*/
protected RandomAccessFileOrArray rf;
/**
* The file name.
*/
protected String fileName;
protected boolean includeCmap;
protected boolean includeExtras;
protected boolean locaShortTable;
protected int[] locaTable;
protected Set<Integer> glyphsUsed;
protected List<Integer> glyphsInList;
protected int tableGlyphOffset;
protected int[] newLocaTable;
protected byte[] newLocaTableOut;
protected byte[] newGlyfTable;
protected int glyfTableRealSize;
protected int locaTableRealSize;
protected byte[] outFont;
protected int fontPtr;
protected int directoryOffset;
/**
* Creates a new TrueTypeFontSubSet
*
* @param directoryOffset The offset from the start of the file to the table directory
* @param fileName the file name of the font
* @param glyphsUsed the glyphs used
* @param includeCmap {@code true} if the table cmap is to be included in the generated font
*/
TrueTypeFontSubset(String fileName, RandomAccessFileOrArray rf, Set<Integer> glyphsUsed, int directoryOffset, boolean includeCmap, boolean includeExtras) {
this.fileName = fileName;
this.rf = rf;
this.glyphsUsed = glyphsUsed;
this.includeCmap = includeCmap;
this.includeExtras = includeExtras;
this.directoryOffset = directoryOffset;
glyphsInList = new ArrayList<>(glyphsUsed);
}
/**
* Does the actual work of subsetting the font.
*
* @return the subset font
* @throws java.io.IOException on error
* @on error
*/
byte[] process() throws java.io.IOException {
try {
createTableDirectory();
readLoca();
flatGlyphs();
createNewGlyphTables();
locaToBytes();
assembleFont();
return outFont;
} finally {
try {
rf.close();
} catch (Exception ignore) {
}
}
}
protected void assembleFont() throws java.io.IOException {
int[] tableLocation;
int fullFontSize = 0;
List<String> tableNames = new ArrayList<>();
Collections.addAll(tableNames, tableNamesSimple);
if (includeExtras) {
Collections.addAll(tableNames, tableNamesExtra);
} else if (includeCmap) {
Collections.addAll(tableNames, tableNamesCmap);
}
int tablesUsed = 2;
for (String name : tableNames) {
if (name.equals("glyf") || name.equals("loca")) {
continue;
}
tableLocation = tableDirectory.get(name);
if (tableLocation == null) {
continue;
}
tablesUsed++;
fullFontSize += tableLocation[TABLE_LENGTH] + 3 & ~3;
}
fullFontSize += newLocaTableOut.length;
fullFontSize += newGlyfTable.length;
int reference = 16 * tablesUsed + 12;
fullFontSize += reference;
outFont = new byte[fullFontSize];
fontPtr = 0;
writeFontInt(0x00010000);
writeFontShort(tablesUsed);
int selector = entrySelectors[tablesUsed];
writeFontShort((1 << selector) * 16);
writeFontShort(selector);
writeFontShort((tablesUsed - (1 << selector)) * 16);
for (String name : tableNames) {
int len;
tableLocation = tableDirectory.get(name);
if (tableLocation == null) {
continue;
}
writeFontString(name);
switch (name) {
case "glyf":
writeFontInt(calculateChecksum(newGlyfTable));
len = glyfTableRealSize;
break;
case "loca":
writeFontInt(calculateChecksum(newLocaTableOut));
len = locaTableRealSize;
break;
default:
writeFontInt(tableLocation[TABLE_CHECKSUM]);
len = tableLocation[TABLE_LENGTH];
break;
}
writeFontInt(reference);
writeFontInt(len);
reference += len + 3 & ~3;
}
for (String name : tableNames) {
tableLocation = tableDirectory.get(name);
if (tableLocation == null) {
continue;
}
switch (name) {
case "glyf":
System.arraycopy(newGlyfTable, 0, outFont, fontPtr, newGlyfTable.length);
fontPtr += newGlyfTable.length;
newGlyfTable = null;
break;
case "loca":
System.arraycopy(newLocaTableOut, 0, outFont, fontPtr, newLocaTableOut.length);
fontPtr += newLocaTableOut.length;
newLocaTableOut = null;
break;
default:
rf.seek(tableLocation[TABLE_OFFSET]);
rf.readFully(outFont, fontPtr, tableLocation[TABLE_LENGTH]);
fontPtr += tableLocation[TABLE_LENGTH] + 3 & ~3;
break;
}
}
}
protected void createTableDirectory() throws java.io.IOException {
tableDirectory = new HashMap<>();
rf.seek(directoryOffset);
int id = rf.readInt();
if (id != 0x00010000) {
throw new IOException(IOException.NotAtTrueTypeFile).setMessageParams(fileName);
}
int num_tables = rf.readUnsignedShort();
rf.skipBytes(6);
for (int k = 0; k < num_tables; ++k) {
String tag = readStandardString(4);
int[] tableLocation = new int[3];
tableLocation[TABLE_CHECKSUM] = rf.readInt();
tableLocation[TABLE_OFFSET] = rf.readInt();
tableLocation[TABLE_LENGTH] = rf.readInt();
tableDirectory.put(tag, tableLocation);
}
}
protected void readLoca() throws java.io.IOException {
int[] tableLocation = tableDirectory.get("head");
if (tableLocation == null) {
throw new IOException(IOException.TableDoesNotExistsIn).setMessageParams("head", fileName);
}
rf.seek(tableLocation[TABLE_OFFSET] + HEAD_LOCA_FORMAT_OFFSET);
locaShortTable = rf.readUnsignedShort() == 0;
tableLocation = tableDirectory.get("loca");
if (tableLocation == null) {
throw new IOException(IOException.TableDoesNotExistsIn).setMessageParams("loca", fileName);
}
rf.seek(tableLocation[TABLE_OFFSET]);
if (locaShortTable) {
int entries = tableLocation[TABLE_LENGTH] / 2;
locaTable = new int[entries];
for (int k = 0; k < entries; ++k) {
locaTable[k] = rf.readUnsignedShort() * 2;
}
} else {
int entries = tableLocation[TABLE_LENGTH] / 4;
locaTable = new int[entries];
for (int k = 0; k < entries; ++k) {
locaTable[k] = rf.readInt();
}
}
}
protected void createNewGlyphTables() throws java.io.IOException {
newLocaTable = new int[locaTable.length];
int[] activeGlyphs = new int[glyphsInList.size()];
for (int k = 0; k < activeGlyphs.length; ++k) {
activeGlyphs[k] = (int) glyphsInList.get(k);
}
Arrays.sort(activeGlyphs);
int glyfSize = 0;
for (int glyph : activeGlyphs) {
glyfSize += locaTable[glyph + 1] - locaTable[glyph];
}
glyfTableRealSize = glyfSize;
glyfSize = glyfSize + 3 & ~3;
newGlyfTable = new byte[glyfSize];
int glyfPtr = 0;
int listGlyf = 0;
for (int k = 0; k < newLocaTable.length; ++k) {
newLocaTable[k] = glyfPtr;
if (listGlyf < activeGlyphs.length && activeGlyphs[listGlyf] == k) {
++listGlyf;
newLocaTable[k] = glyfPtr;
int start = locaTable[k];
int len = locaTable[k + 1] - start;
if (len > 0) {
rf.seek(tableGlyphOffset + start);
rf.readFully(newGlyfTable, glyfPtr, len);
glyfPtr += len;
}
}
}
}
protected void locaToBytes() {
if (locaShortTable) {
locaTableRealSize = newLocaTable.length * 2;
} else {
locaTableRealSize = newLocaTable.length * 4;
}
newLocaTableOut = new byte[locaTableRealSize + 3 & ~3];
outFont = newLocaTableOut;
fontPtr = 0;
for (int k = 0; k < newLocaTable.length; ++k) {
if (locaShortTable)
writeFontShort(newLocaTable[k] / 2);
else
writeFontInt(newLocaTable[k]);
}
}
protected void flatGlyphs() throws java.io.IOException {
int[] tableLocation = tableDirectory.get("glyf");
if (tableLocation == null)
throw new IOException(IOException.TableDoesNotExistsIn).setMessageParams("glyf", fileName);
int glyph0 = 0;
if (!glyphsUsed.contains(glyph0)) {
glyphsUsed.add(glyph0);
glyphsInList.add(glyph0);
}
tableGlyphOffset = tableLocation[TABLE_OFFSET];
// Do not replace with foreach. ConcurrentModificationException will arise.
for (int k = 0; k < glyphsInList.size(); ++k) {
int glyph = (int) glyphsInList.get(k);
checkGlyphComposite(glyph);
}
}
protected void checkGlyphComposite(int glyph) throws java.io.IOException {
int start = locaTable[glyph];
if (start == locaTable[glyph + 1]) {// no contour
return;
}
rf.seek(tableGlyphOffset + start);
int numContours = rf.readShort();
if (numContours >= 0) {
return;
}
rf.skipBytes(8);
for (; ; ) {
int flags = rf.readUnsignedShort();
int cGlyph = rf.readUnsignedShort();
if (!glyphsUsed.contains(cGlyph)) {
glyphsUsed.add(cGlyph);
glyphsInList.add(cGlyph);
}
if ((flags & MORE_COMPONENTS) == 0) {
return;
}
int skip;
if ((flags & ARG_1_AND_2_ARE_WORDS) != 0) {
skip = 4;
} else {
skip = 2;
}
if ((flags & WE_HAVE_A_SCALE) != 0) {
skip += 2;
} else if ((flags & WE_HAVE_AN_X_AND_Y_SCALE) != 0) {
skip += 4;
}
if ((flags & WE_HAVE_A_TWO_BY_TWO) != 0) {
skip += 8;
}
rf.skipBytes(skip);
}
}
/**
* Reads a {@code String} from the font file as bytes using the Cp1252 encoding.
*
* @param length the length of bytes to read
* @return the {@code String} read
* @throws java.io.IOException the font file could not be read
*/
protected String readStandardString(int length) throws java.io.IOException {
byte[] buf = new byte[length];
rf.readFully(buf);
try {
return new String(buf, PdfEncodings.WINANSI);
} catch (Exception e) {
throw new IOException("TrueType font", e);
}
}
protected void writeFontShort(int n) {
outFont[fontPtr++] = (byte) (n >> 8);
outFont[fontPtr++] = (byte) n;
}
protected void writeFontInt(int n) {
outFont[fontPtr++] = (byte) (n >> 24);
outFont[fontPtr++] = (byte) (n >> 16);
outFont[fontPtr++] = (byte) (n >> 8);
outFont[fontPtr++] = (byte) n;
}
protected void writeFontString(String s) {
byte[] b = PdfEncodings.convertToBytes(s, PdfEncodings.WINANSI);
System.arraycopy(b, 0, outFont, fontPtr, b.length);
fontPtr += b.length;
}
protected int calculateChecksum(byte[] b) {
int len = b.length / 4;
int v0 = 0;
int v1 = 0;
int v2 = 0;
int v3 = 0;
int ptr = 0;
for (int k = 0; k < len; ++k) {
v3 += b[ptr++] & 0xff;
v2 += b[ptr++] & 0xff;
v1 += b[ptr++] & 0xff;
v0 += b[ptr++] & 0xff;
}
return v0 + (v1 << 8) + (v2 << 16) + (v3 << 24);
}
}
⏎ com/itextpdf/io/font/TrueTypeFontSubset.java
Or download all of them as a single archive file:
File name: io-7.1.4-sources.jar File size: 608762 bytes Release date: 2018-10-09 Download
⇒ iText layout.jar Source Code
⇐ iText kernel.jar Source Code
2018-04-09, 91437👍, 5💬
