--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/myVncProxy/InStream.java	Sun Apr 24 23:03:00 2011 +0900
@@ -0,0 +1,178 @@
+package myVncProxy;
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software 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 for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+//
+// rdr::InStream marshalls data from a buffer stored in RDR (RFB Data
+// Representation).
+//
+
+abstract public class InStream {
+
+  // check() ensures there is buffer data for at least one item of size
+  // itemSize bytes.  Returns the number of items in the buffer (up to a
+  // maximum of nItems).
+
+  public final int check(int itemSize, int nItems) throws Exception {
+    if (ptr + itemSize * nItems > end) {
+      if (ptr + itemSize > end)
+        return overrun(itemSize, nItems);
+
+      nItems = (end - ptr) / itemSize;
+    }
+    return nItems;
+  }
+
+  public final void check(int itemSize) throws Exception {
+    if (ptr + itemSize > end)
+      overrun(itemSize, 1);
+  }
+
+  // readU/SN() methods read unsigned and signed N-bit integers.
+
+  public final int readS8() throws Exception {
+    check(1); return b[ptr++];
+  }
+
+  public final int readS16() throws Exception {
+    check(2); int b0 = b[ptr++];
+    int b1 = b[ptr++] & 0xff; return b0 << 8 | b1;
+  }
+
+  public final int readS32() throws Exception {
+    check(4); int b0 = b[ptr++];
+    int b1 = b[ptr++] & 0xff;
+    int b2 = b[ptr++] & 0xff;
+    int b3 = b[ptr++] & 0xff;
+    return b0 << 24 | b1 << 16 | b2 << 8 | b3;
+  }
+
+  public final int readU8() throws Exception {
+    return readS8() & 0xff;
+  }
+
+  public final int readU16() throws Exception {
+    return readS16() & 0xffff;
+  }
+
+  public final int readU32() throws Exception {
+    return readS32() & 0xffffffff;
+  }
+
+  // readString() reads a string - a U32 length followed by the data.
+
+  public final String readString() throws Exception {
+    int len = readU32();
+    if (len > maxStringLength)
+      throw new Exception("InStream max string length exceeded");
+
+    char[] str = new char[len];
+    int i = 0;
+    while (i < len) {
+      int j = i + check(1, len - i);
+      while (i < j) {
+	str[i++] = (char)b[ptr++];
+      }
+    }
+
+    return new String(str);
+  }
+
+  // maxStringLength protects against allocating a huge buffer.  Set it
+  // higher if you need longer strings.
+
+  public static int maxStringLength = 65535;
+
+  public final void skip(int bytes) throws Exception {
+    while (bytes > 0) {
+      int n = check(1, bytes);
+      ptr += n;
+      bytes -= n;
+    }
+  }
+
+  // readBytes() reads an exact number of bytes into an array at an offset.
+
+  public void readBytes(byte[] data, int offset, int length) throws Exception {
+    int offsetEnd = offset + length;
+    while (offset < offsetEnd) {
+      int n = check(1, offsetEnd - offset);
+      System.arraycopy(b, ptr, data, offset, n);
+      ptr += n;
+      offset += n;
+    }
+  }
+
+  // readOpaqueN() reads a quantity "without byte-swapping".  Because java has
+  // no byte-ordering, we just use big-endian.
+
+  public final int readOpaque8() throws Exception {
+    return readU8();
+  }
+
+  public final int readOpaque16() throws Exception {
+    return readU16();
+  }
+
+  public final int readOpaque32() throws Exception {
+    return readU32();
+  }
+
+  public final int readOpaque24A() throws Exception {
+    check(3); int b0 = b[ptr++];
+    int b1 = b[ptr++]; int b2 = b[ptr++];
+    return b0 << 24 | b1 << 16 | b2 << 8;
+  }
+
+  public final int readOpaque24B() throws Exception {
+    check(3); int b0 = b[ptr++];
+    int b1 = b[ptr++]; int b2 = b[ptr++];
+    return b0 << 16 | b1 << 8 | b2;
+  }
+
+  // pos() returns the position in the stream.
+
+  abstract public int pos();
+
+  // bytesAvailable() returns true if at least one byte can be read from the
+  // stream without blocking.  i.e. if false is returned then readU8() would
+  // block.
+
+  public boolean bytesAvailable() { return end != ptr; }
+
+  // getbuf(), getptr(), getend() and setptr() are "dirty" methods which allow
+  // you to manipulate the buffer directly.  This is useful for a stream which
+  // is a wrapper around an underlying stream.
+
+  public final byte[] getbuf() { return b; }
+  public final int getptr() { return ptr; }
+  public final int getend() { return end; }
+  public final void setptr(int p) { ptr = p; }
+
+  // overrun() is implemented by a derived class to cope with buffer overrun.
+  // It ensures there are at least itemSize bytes of buffer data.  Returns
+  // the number of items in the buffer (up to a maximum of nItems).  itemSize
+  // is supposed to be "small" (a few bytes).
+
+  abstract protected int overrun(int itemSize, int nItems) throws Exception;
+
+  protected InStream() {}
+  protected byte[] b;
+  protected int ptr;
+  protected int end;
+}