EncodedFileOutputStream.java

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/*
 * SleuthKit Java Bindings
 *
 * Copyright 2011-2016 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 *
 * Licensed 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.
 */
package org.sleuthkit.datamodel;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class EncodedFileOutputStream extends BufferedOutputStream {

        private final TskData.EncodingType type;
        private long encodedDataLength;

        public EncodedFileOutputStream(OutputStream out, TskData.EncodingType type) throws IOException {
                super(out);
                this.type = type;
                encodedDataLength = 0;
                writeHeader();
        }

        public EncodedFileOutputStream(OutputStream out, int size, TskData.EncodingType type) throws IOException {
                super(out, size);
                this.type = type;
                writeHeader();
        }

        private void writeHeader() throws IOException {
                // We get the encoded header here so it will be in plaintext after encoding
                write(EncodedFileUtil.getEncodedHeader(type), 0, EncodedFileUtil.getHeaderLength());
                encodedDataLength -= EncodedFileUtil.getHeaderLength();
        }

        @Override
        public void write(int b) throws IOException {
                super.write((int) EncodedFileUtil.encodeByte((byte) b, type));
                encodedDataLength++;
        }

        @Override
        public void write(byte[] b,
                        int off,
                        int len)
                        throws IOException {
                byte[] encodedData = new byte[b.length];
                for (int i = 0; i < b.length; i++) {
                        encodedData[i] = EncodedFileUtil.encodeByte(b[i], type);
                }

                super.write(encodedData, off, len);
                encodedDataLength += len;
        }
        
        public long getBytesWritten() {
                return encodedDataLength;
        } 
}