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- /*
- * 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, <em>The Type 42 Font Format Specification</em>.).
- */
- 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> ");
- }
-
- }
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