1 files changed, 352 insertions, 0 deletions

diff --git a/songdbj/de/jarnbjo/util/io/ByteArrayBitInputStream.java b/songdbj/de/jarnbjo/util/io/ByteArrayBitInputStream.java
new file mode 100644
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+++ b/songdbj/de/jarnbjo/util/io/ByteArrayBitInputStream.java
@@ -0,0 +1,352 @@
+/*
+ * $ProjectName$
+ * $ProjectRevision$
+ * -----------------------------------------------------------
+ * $Id$
+ * -----------------------------------------------------------
+ *
+ * $Author$
+ *
+ * Description:
+ *
+ * Copyright 2002-2003 Tor-Einar Jarnbjo
+ * -----------------------------------------------------------
+ *
+ * Change History
+ * -----------------------------------------------------------
+ * $Log$
+ * Revision 1.1  2005/07/11 15:42:36  hcl
+ * Songdb java version, source. only 1.5 compatible
+ *
+ * Revision 1.1.1.1  2004/04/04 22:09:12  shred
+ * First Import
+ *
+ * Revision 1.3  2003/04/10 19:48:31  jarnbjo
+ * no message
+ *
+ * Revision 1.2  2003/03/16 01:11:39  jarnbjo
+ * no message
+ *
+ * Revision 1.1  2003/03/03 21:02:20  jarnbjo
+ * no message
+ *
+ */
+
+package de.jarnbjo.util.io;
+
+import java.io.IOException;
+
+/**
+ *  Implementation of the <code>BitInputStream</code> interface,
+ *  using a byte array as data source.
+*/
+
+public class ByteArrayBitInputStream implements BitInputStream {
+
+   private byte[] source;
+   private byte currentByte;
+
+   private int endian;
+
+   private int byteIndex=0;
+   private int bitIndex=0;
+
+   public ByteArrayBitInputStream(byte[] source) {
+      this(source, LITTLE_ENDIAN);
+   }
+
+   public ByteArrayBitInputStream(byte[] source, int endian) {
+      this.endian=endian;
+      this.source=source;
+      currentByte=source[0];
+      bitIndex=(endian==LITTLE_ENDIAN)?0:7;
+   }
+
+   public boolean getBit() throws IOException {
+      if(endian==LITTLE_ENDIAN) {
+         if(bitIndex>7) {
+            bitIndex=0;
+            currentByte=source[++byteIndex];
+         }
+         return (currentByte&(1<<(bitIndex++)))!=0;
+      }
+      else {
+         if(bitIndex<0) {
+            bitIndex=7;
+            currentByte=source[++byteIndex];
+         }
+         return (currentByte&(1<<(bitIndex--)))!=0;
+      }
+   }
+
+   public int getInt(int bits) throws IOException {
+      if(bits>32) {
+         throw new IllegalArgumentException("Argument \"bits\" must be <= 32");
+      }
+      int res=0;
+      if(endian==LITTLE_ENDIAN) {
+         for(int i=0; i<bits; i++) {
+            if(getBit()) {
+               res|=(1<<i);
+            }
+         }
+      }
+      else {
+         if(bitIndex<0) {
+            bitIndex=7;
+            currentByte=source[++byteIndex];
+         }
+         if(bits<=bitIndex+1) {
+            int ci=((int)currentByte)&0xff;
+            int offset=1+bitIndex-bits;
+            int mask=((1<<bits)-1)<<offset;
+            res=(ci&mask)>>offset;
+            bitIndex-=bits;
+         }
+         else {
+            res=(((int)currentByte)&0xff&((1<<(bitIndex+1))-1))<<(bits-bitIndex-1);
+            bits-=bitIndex+1;
+            currentByte=source[++byteIndex];
+            while(bits>=8) {
+               bits-=8;
+               res|=(((int)source[byteIndex])&0xff)<<bits;
+               currentByte=source[++byteIndex];
+            }
+            if(bits>0) {
+               int ci=((int)source[byteIndex])&0xff;
+               res|=(ci>>(8-bits))&((1<<bits)-1);
+               bitIndex=7-bits;
+            }
+            else {
+               currentByte=source[--byteIndex];
+               bitIndex=-1;
+            }
+         }
+      }
+
+      return res;
+   }
+
+   public int getSignedInt(int bits) throws IOException {
+      int raw=getInt(bits);
+      if(raw>=1<<(bits-1)) {
+         raw-=1<<bits;
+      }
+      return raw;
+   }
+
+   public int getInt(HuffmanNode root) throws IOException {
+      while(root.value==null) {
+         if(bitIndex>7) {
+            bitIndex=0;
+            currentByte=source[++byteIndex];
+         }
+         root=(currentByte&(1<<(bitIndex++)))!=0?root.o1:root.o0;
+      }
+      return root.value.intValue();
+   }
+
+   public long getLong(int bits) throws IOException {
+      if(bits>64) {
+         throw new IllegalArgumentException("Argument \"bits\" must be <= 64");
+      }
+      long res=0;
+      if(endian==LITTLE_ENDIAN) {
+         for(int i=0; i<bits; i++) {
+            if(getBit()) {
+               res|=(1L<<i);
+            }
+         }
+      }
+      else {
+         for(int i=bits-1; i>=0; i--) {
+            if(getBit()) {
+               res|=(1L<<i);
+            }
+         }
+      }
+      return res;
+   }
+
+        /**
+         *  <p>reads an integer encoded as "signed rice" as described in
+         *  the FLAC audio format specification</p>
+         *      
+         *  <p><b>not supported for little endian</b></p>
+         *
+         *  @param order 
+         *  @return the decoded integer value read from the stream
+         *
+         *  @throws IOException if an I/O error occurs
+         *  @throws UnsupportedOperationException if the method is not supported by the implementation
+         */
+    
+   public int readSignedRice(int order) throws IOException {
+
+      int msbs=-1, lsbs=0, res=0;
+
+      if(endian==LITTLE_ENDIAN) {
+         // little endian
+         throw new UnsupportedOperationException("ByteArrayBitInputStream.readSignedRice() is only supported in big endian mode");
+      }
+      else {
+         // big endian
+
+         byte cb=source[byteIndex];
+         do {
+            msbs++;
+            if(bitIndex<0) {
+               bitIndex=7;
+               byteIndex++;
+               cb=source[byteIndex];
+            }
+         } while((cb&(1<<bitIndex--))==0);
+
+         int bits=order;
+
+         if(bitIndex<0) {
+            bitIndex=7;
+            byteIndex++;
+         }
+         if(bits<=bitIndex+1) {
+            int ci=((int)source[byteIndex])&0xff;
+            int offset=1+bitIndex-bits;
+            int mask=((1<<bits)-1)<<offset;
+            lsbs=(ci&mask)>>offset;
+            bitIndex-=bits;
+         }
+         else {
+            lsbs=(((int)source[byteIndex])&0xff&((1<<(bitIndex+1))-1))<<(bits-bitIndex-1);
+            bits-=bitIndex+1;
+            byteIndex++;
+            while(bits>=8) {
+               bits-=8;
+               lsbs|=(((int)source[byteIndex])&0xff)<<bits;
+               byteIndex++;
+            }
+            if(bits>0) {
+               int ci=((int)source[byteIndex])&0xff;
+               lsbs|=(ci>>(8-bits))&((1<<bits)-1);
+               bitIndex=7-bits;
+            }
+            else {
+               byteIndex--;
+               bitIndex=-1;
+            }
+         }
+
+         res=(msbs<<order)|lsbs;
+      }
+
+      return (res&1)==1?-(res>>1)-1:(res>>1);
+   }
+
+        /**
+         *  <p>fills the array from <code>offset</code> with <code>len</code> 
+         *  integers encoded as "signed rice" as described in
+         *  the FLAC audio format specification</p>
+         *      
+         *  <p><b>not supported for little endian</b></p>
+         *
+         *  @param order 
+         *  @param buffer
+         *  @param offset
+         *  @param len 
+         *  @return the decoded integer value read from the stream
+         *
+         *  @throws IOException if an I/O error occurs
+         *  @throws UnsupportedOperationException if the method is not supported by the implementation
+         */
+
+   public void readSignedRice(int order, int[] buffer, int off, int len) throws IOException {
+
+      if(endian==LITTLE_ENDIAN) {
+         // little endian
+         throw new UnsupportedOperationException("ByteArrayBitInputStream.readSignedRice() is only supported in big endian mode");
+      }
+      else {
+         // big endian
+         for(int i=off; i<off+len; i++) {
+
+            int msbs=-1, lsbs=0;
+
+            byte cb=source[byteIndex];
+            do {
+               msbs++;
+               if(bitIndex<0) {
+                  bitIndex=7;
+                  byteIndex++;
+                  cb=source[byteIndex];
+               }
+            } while((cb&(1<<bitIndex--))==0);
+
+            int bits=order;
+
+            if(bitIndex<0) {
+               bitIndex=7;
+               byteIndex++;
+            }
+            if(bits<=bitIndex+1) {
+               int ci=((int)source[byteIndex])&0xff;
+               int offset=1+bitIndex-bits;
+               int mask=((1<<bits)-1)<<offset;
+               lsbs=(ci&mask)>>offset;
+               bitIndex-=bits;
+            }
+            else {
+               lsbs=(((int)source[byteIndex])&0xff&((1<<(bitIndex+1))-1))<<(bits-bitIndex-1);
+               bits-=bitIndex+1;
+               byteIndex++;
+               while(bits>=8) {
+                  bits-=8;
+                  lsbs|=(((int)source[byteIndex])&0xff)<<bits;
+                  byteIndex++;
+               }
+               if(bits>0) {
+                  int ci=((int)source[byteIndex])&0xff;
+                  lsbs|=(ci>>(8-bits))&((1<<bits)-1);
+                  bitIndex=7-bits;
+               }
+               else {
+                  byteIndex--;
+                  bitIndex=-1;
+               }
+            }
+
+            int res=(msbs<<order)|lsbs;
+            buffer[i]=(res&1)==1?-(res>>1)-1:(res>>1);
+         }
+      }
+   }
+
+   public void align() {
+      if(endian==BIG_ENDIAN && bitIndex>=0) {
+         bitIndex=7;
+         byteIndex++;
+      }
+      else if(endian==LITTLE_ENDIAN && bitIndex<=7) {
+         bitIndex=0;
+         byteIndex++;
+      }
+   }
+
+   public void setEndian(int endian) {
+      if(this.endian==BIG_ENDIAN && endian==LITTLE_ENDIAN) {
+         bitIndex=0;
+         byteIndex++;
+      }
+      else if(this.endian==LITTLE_ENDIAN && endian==BIG_ENDIAN) {
+         bitIndex=7;
+         byteIndex++;
+      }
+      this.endian=endian;
+   }
+
+        /**
+         *  @return the byte array used as a source for this instance
+         */
+
+   public byte[] getSource() {
+      return source;
+   }
+}
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