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/*
* Copyright (C) 2010 Preston Lacey http://javaflacencoder.sourceforge.net/
* All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package javaFlacEncoder;
import java.security.MessageDigest;
/**
*
* @author preston
*/
public class FLAC_MD5 {
private MessageDigest md = null;
private byte[] _dataMD5 = null;
public FLAC_MD5() throws java.security.NoSuchAlgorithmException {
md = MessageDigest.getInstance("md5");
}
public MessageDigest getMD() {
return md;
}
/**
* Add samples to the MD5 hash.
* CURRENTLY ONLY MAY WORK FOR: sample sizes which are divisible by 8. Need
* to create some audio to test with.
* @param samples
* @param count
* @param channels
*/
public void addSamplesToMD5(int[] samples, int count, int channels,
int sampleSize) {
int bytesPerSample = sampleSize/8;
if(sampleSize%8 != 0)
bytesPerSample++;
if(_dataMD5 == null || _dataMD5.length < count*bytesPerSample*channels) {
_dataMD5 = new byte[count*bytesPerSample*channels];
}
byte[] dataMD5 = _dataMD5;
splitSamplesToBytes(samples, count*channels, bytesPerSample, dataMD5);
md.update(dataMD5, 0, count*bytesPerSample*channels);
}
/* Split Samples to bytes(for sending to MD5)
* CURRENTLY ONLY MAY WORK FOR: sample sizes which are divisible by 8. Need
* to create some audio to test with.*/
private static final void splitSamplesToBytes(int[] samples, int totalSamples,
int bytesPerSample, byte[] dataMD5) {
int destIndexBase = 0;
int i = 0;
switch(bytesPerSample) {
case 3:
for(; i < totalSamples; i++) {
dataMD5[destIndexBase++] = (byte)(samples[i]);
dataMD5[destIndexBase++] = (byte)(samples[i] >> 8);
dataMD5[destIndexBase++] = (byte)(samples[i] >> 16);
}
break;
case 2:
for(; i < totalSamples; i++) {
dataMD5[destIndexBase++] = (byte)(samples[i]);
dataMD5[destIndexBase++] = (byte)(samples[i] >> 8);
}
break;
case 1:
for(; i < totalSamples; i++) {
dataMD5[i] = (byte)samples[i];
}
}
}
}
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