MultipartParser.java

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
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 * See @authors listed below
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package org.dcm4che3.mime;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 *
 */
public class MultipartParser {

    public interface Handler {
        void bodyPart(int partNumber, MultipartInputStream in) throws IOException;
    };

    private final String boundary;

    public MultipartParser(String boundary) {
        this.boundary = boundary;
    }

    @SuppressWarnings("resource")
    public void parse(InputStream in, Handler handler) throws IOException {
        new MultipartInputStream(in, "--" + boundary).skipAll(); // skip preamble
        for (int i=1;;i++) {
            int ch1 = in.read();
            int ch2 = in.read();
            if ((ch1 | ch2) < 0)
                throw new EOFException();

            if (ch1 == '-' && ch2 == '-')
                break;

            if (ch1 != '\r' || ch2 != '\n')
                throw new IOException("missing CR/LF after boundary");

            MultipartInputStream mis = new MultipartInputStream(in, "\r\n--" + boundary);
            handler.bodyPart(i, mis);
            mis.skipAll();
        }
    }
}