--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/code/CompressedReadStream.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2000-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.code;
+
+import sun.jvm.hotspot.debugger.*;
+
+public class CompressedReadStream extends CompressedStream {
+  /** Equivalent to CompressedReadStream(buffer, 0) */
+  public CompressedReadStream(Address buffer) {
+    this(buffer, 0);
+  }
+
+  public CompressedReadStream(Address buffer, int position) {
+    super(buffer, position);
+  }
+
+  public boolean readBoolean() {
+    return (read() != 0);
+  }
+
+  public byte readByte() {
+    return (byte) read();
+  }
+
+  public char readChar() {
+    return (char) readInt();
+  }
+
+  public short readShort() {
+    return (short) readSignedInt();
+  }
+
+  public int readSignedInt() {
+    return decodeSign(readInt());
+  }
+
+  public int readInt() {
+    int b0 = read();
+    if (b0 < L) {
+      return b0;
+    } else {
+      return readIntMb(b0);
+    }
+  }
+
+
+  public float readFloat() {
+    return Float.intBitsToFloat(reverseInt(readInt()));
+  }
+
+  public double readDouble() {
+    int rh = readInt();
+    int rl = readInt();
+    int h = reverseInt(rh);
+    int l = reverseInt(rl);
+    return Double.longBitsToDouble((h << 32) | ((long)l & 0x00000000FFFFFFFFL));
+  }
+
+  public long readLong() {
+    long low = readSignedInt() & 0x00000000FFFFFFFFL;
+    long high = readSignedInt();
+    return (high << 32) | low;
+  }
+
+  //--------------------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+
+  // This encoding, called UNSIGNED5, is taken from J2SE Pack200.
+  // It assumes that most values have lots of leading zeroes.
+  // Very small values, in the range [0..191], code in one byte.
+  // Any 32-bit value (including negatives) can be coded, in
+  // up to five bytes.  The grammar is:
+  //    low_byte  = [0..191]
+  //    high_byte = [192..255]
+  //    any_byte  = low_byte | high_byte
+  //    coding = low_byte
+  //           | high_byte low_byte
+  //           | high_byte high_byte low_byte
+  //           | high_byte high_byte high_byte low_byte
+  //           | high_byte high_byte high_byte high_byte any_byte
+  // Each high_byte contributes six bits of payload.
+  // The encoding is one-to-one (except for integer overflow)
+  // and easy to parse and unparse.
+
+  private int readIntMb(int b0) {
+    int pos = position - 1;
+    int sum = b0;
+    // must collect more bytes: b[1]...b[4]
+    int lg_H_i = lg_H;
+    for (int i = 0; ;) {
+      int b_i = read(pos + (++i));
+      sum += b_i << lg_H_i; // sum += b[i]*(64**i)
+      if (b_i < L || i == MAX_i) {
+        setPosition(pos+i+1);
+        return sum;
+      }
+      lg_H_i += lg_H;
+    }
+  }
+
+  private short read(int index) {
+    return (short) buffer.getCIntegerAt(index, 1, true);
+  }
+
+  /** Reads an unsigned byte, but returns it as a short */
+  private short read() {
+    short retval = (short) buffer.getCIntegerAt(position, 1, true);
+    ++position;
+    return retval;
+  }
+}