1 files changed, 90 insertions, 0 deletions
diff --git a/src/javaFlacEncoder/FLAC_MD5.java b/src/javaFlacEncoder/FLAC_MD5.java
new file mode 100644
index 0000000..1577356
--- /dev/null
+++ b/src/javaFlacEncoder/FLAC_MD5.java
@@ -0,0 +1,90 @@
+/*
+ * 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];
+        }
+    }
+  }
+}