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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.afp.parser;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
/**
* An simple MO:DCA/AFP parser.
*/
public class MODCAParser {
/** The carriage control character (0x5A) used to indicate the start of a structured field. */
public static final byte CARRIAGE_CONTROL_CHAR = (byte)(0x5A & 0xFF);
private DataInputStream din;
/**
* Main constructor
* @param in the {@link InputStream} to read the AFP file from.
*/
public MODCAParser(InputStream in) {
if (!in.markSupported()) {
in = new java.io.BufferedInputStream(in);
}
this.din = new DataInputStream(in);
}
/**
* Returns the {@link DataInputStream} used for parsing structured fields.
* @return the data input stream
*/
public DataInputStream getDataInputStream() {
return this.din;
}
/**
* Reads the next structured field from the input stream.
* <p>
* No structure validation of the MO:DCA file is performed.
* @return a new unparsed structured field (or null when parsing is finished).
* @throws IOException if an I/O error occurs
*/
public UnparsedStructuredField readNextStructuredField() throws IOException {
try {
while (true) {
byte b = din.readByte(); //Skip 0x5A character if necessary (ex. AFP)
if (b == 0x0D || b == 0x0A) {
//CR and LF may be used as field delimiters
continue;
} else if (b == CARRIAGE_CONTROL_CHAR) {
break; //Signals the start of a new structured field
}
}
} catch (EOFException eof) {
return null;
}
return UnparsedStructuredField.readStructuredField(getDataInputStream());
}
}
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