org.apache.fop.fonts.type1.PFBParser Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of fop Show documentation
Show all versions of fop Show documentation
Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF.
/*
* 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.
*/
/* $Id: PFBParser.java 1356646 2012-07-03 09:46:41Z mehdi $ */
package org.apache.fop.fonts.type1;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
/**
* This class represents a parser for Adobe Type 1 PFB files.
*
* @see PFBData
*/
public class PFBParser {
private static final byte[] CURRENTFILE_EEXEC;
private static final byte[] CLEARTOMARK;
static {
try {
CURRENTFILE_EEXEC = "currentfile eexec".getBytes("US-ASCII");
CLEARTOMARK = "cleartomark".getBytes("US-ASCII");
} catch (java.io.UnsupportedEncodingException e) {
throw new RuntimeException("Incompatible VM. It doesn't support the US-ASCII encoding");
}
}
/**
* Parses a PFB file into a PFBData object.
* @param in InputStream to load the PFB file from
* @return PFBData memory representation of the font
* @throws IOException In case of an I/O problem
*/
public PFBData parsePFB(InputStream in) throws IOException {
PFBData pfb = new PFBData();
BufferedInputStream bin = new BufferedInputStream(in);
DataInputStream din = new DataInputStream(bin);
din.mark(32);
int firstByte = din.readUnsignedByte();
din.reset();
if (firstByte == 128) {
pfb.setPFBFormat(PFBData.PFB_PC);
parsePCFormat(pfb, din);
} else {
pfb.setPFBFormat(PFBData.PFB_RAW);
parseRAWFormat(pfb, bin);
}
return pfb;
}
private static int swapInteger(final int value) {
return (((value >> 0) & 0xff) << 24)
+ (((value >> 8) & 0xff) << 16)
+ (((value >> 16) & 0xff) << 8)
+ (((value >> 24) & 0xff) << 0);
}
private void parsePCFormat(PFBData pfb, DataInputStream din) throws IOException {
int segmentHead;
int segmentType;
//Read first segment
segmentHead = din.readUnsignedByte();
if (segmentHead != 128) {
throw new IOException("Invalid file format. Expected ASCII 80hex");
}
segmentType = din.readUnsignedByte(); //Read
int len1 = swapInteger(din.readInt());
byte[] headerSegment = new byte[len1];
din.readFully(headerSegment);
pfb.setHeaderSegment(headerSegment);
//Read second segment
segmentHead = din.readUnsignedByte();
if (segmentHead != 128) {
throw new IOException("Invalid file format. Expected ASCII 80hex");
}
segmentType = din.readUnsignedByte();
int len2 = swapInteger(din.readInt());
byte[] encryptedSegment = new byte[len2];
din.readFully(encryptedSegment);
pfb.setEncryptedSegment(encryptedSegment);
//Read third segment
segmentHead = din.readUnsignedByte();
if (segmentHead != 128) {
throw new IOException("Invalid file format. Expected ASCII 80hex");
}
segmentType = din.readUnsignedByte();
int len3 = swapInteger(din.readInt());
byte[] trailerSegment = new byte[len3];
din.readFully(trailerSegment);
pfb.setTrailerSegment(trailerSegment);
//Read EOF indicator
segmentHead = din.readUnsignedByte();
if (segmentHead != 128) {
throw new IOException("Invalid file format. Expected ASCII 80hex");
}
segmentType = din.readUnsignedByte();
if (segmentType != 3) {
throw new IOException("Expected segment type 3, but found: " + segmentType);
}
}
private static boolean byteCmp(byte[] src, int srcOffset, byte[] cmp) {
for (int i = 0; i < cmp.length; i++) {
// System.out.println("Compare: " + src[srcOffset + i] + " " + cmp[i]);
if (src[srcOffset + i] != cmp[i]) {
return false;
}
}
return true;
}
private void calcLengths(PFBData pfb, byte[] originalData) {
// Calculate length 1 and 3
// System.out.println ("Checking font, size = "+originalData.length);
// Length1 is the size of the initial ascii portion
// search for "currentfile eexec"
// Get the first binary number and search backwards for "eexec"
int len1 = 30;
// System.out.println("Length1="+len1);
while (!byteCmp(originalData, len1 - CURRENTFILE_EEXEC.length, CURRENTFILE_EEXEC)) {
len1++;
}
// Skip newline
len1++;
// Length3 is length of the last portion of the file
int len3 = 0;
len3 -= CLEARTOMARK.length;
while (!byteCmp(originalData, originalData.length + len3, CLEARTOMARK)) {
len3--;
// System.out.println("Len3="+len3);
}
len3 = -len3;
len3++;
// Eat 512 zeroes
int numZeroes = 0;
byte[] ws1 = new byte[]{0x0D}; //CR
byte[] ws2 = new byte[]{0x0A}; //LF
byte[] ws3 = new byte[]{0x30}; //"0"
while ((originalData[originalData.length - len3] == ws1[0]
|| originalData[originalData.length - len3] == ws2[0]
|| originalData[originalData.length - len3] == ws3[0])
&& numZeroes < 512) {
len3++;
if (originalData[originalData.length - len3] == ws3[0]) {
numZeroes++;
}
}
// System.out.println("Length3="+len3);
//Create the 3 segments
byte[] buffer = new byte[len1];
System.arraycopy(originalData, 0, buffer, 0, len1);
pfb.setHeaderSegment(buffer);
int len2 = originalData.length - len3 - len1;
buffer = new byte[len2];
System.arraycopy(originalData, len1, buffer, 0, len2);
pfb.setEncryptedSegment(buffer);
buffer = new byte[len3];
System.arraycopy(originalData, len1 + len2, buffer, 0, len3);
pfb.setTrailerSegment(buffer);
}
private void parseRAWFormat(PFBData pfb, BufferedInputStream bin)
throws IOException {
calcLengths(pfb, IOUtils.toByteArray(bin));
}
}