org.apache.fop.render.ps.fonts.PSTTFGenerator 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.
*/
/* $Id$ */
package org.apache.fop.render.ps.fonts;
import java.io.IOException;
import org.apache.xmlgraphics.ps.PSGenerator;
import org.apache.xmlgraphics.util.io.ASCIIHexOutputStream;
/**
* This is a wrapper for {@link PSGenerator} that contains some members specific for streaming
* TrueType fonts to a PostScript document.
*/
public class PSTTFGenerator {
private PSGenerator gen;
private ASCIIHexOutputStream hexOut;
/**
* The buffer is used to store the font file in an array of hex-encoded strings. Strings are
* limited to 65535 characters, string will start with a newline, 2 characters are needed to
* hex-encode each byte.
*/
public static final int MAX_BUFFER_SIZE = 32764;
/**
* Creates a new instance wrapping the given generator.
* @param gen the PSGenerator to wrap
*/
public PSTTFGenerator(PSGenerator gen) {
this.gen = gen;
hexOut = new ASCIIHexOutputStream(gen.getOutputStream());
}
/**
* Writes the '<' character that starts a string.
*/
public void startString() throws IOException {
// We need to reset the streamer so that it starts a new line in the PS document
hexOut = new ASCIIHexOutputStream(gen.getOutputStream());
gen.writeln("<");
}
/**
* Writes the given string to the output.
* @param cmd a string
*/
public void write(String cmd) throws IOException {
gen.write(cmd);
}
/**
* Writes the given string to the output, followed by a newline.
* @param cmd a string
*/
public void writeln(String cmd) throws IOException {
gen.writeln(cmd);
}
/**
* Writes bytes from the given byte array to the output.
*
* @param byteArray byte[] a byte array
* @param offset the position in the byte array where the streaming must start
* @param length the number of bytes to stream. This MUST be less than
* {@link #MAX_BUFFER_SIZE} - 1 since strings are suffixed by '00' (see Section 4.2 of
* Adobe Technical Note #5012, The Type 42 Font Format Specification.).
*/
public void streamBytes(byte[] byteArray, int offset, int length) throws IOException {
if (length > MAX_BUFFER_SIZE) {
throw new UnsupportedOperationException("Attempting to write a string to a PostScript"
+ " file that is greater than the buffer size.");
}
hexOut.write(byteArray, offset, length);
}
/**
* Finishes writing a string by appending '00' and '>' to the end.
*/
public void endString() throws IOException {
/* Appends a '00' to the end of the string as specified in the spec */
gen.write("00\n> ");
}
}