cdev-1.7.2n

extensions/cdevGenericServer/NameServer/java/rsvcDataInputStream.java

@@ -0,0 +1,240 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 1994,1995 Southeastern Universities Research Association,
+//                         Continuous Electron Beam Accelerator Facility
+//
+// This software was developed under a United States Government license
+// described in the NOTICE file included as part of this distribution.
+//
+// Jefferson Lab HPC Group, 12000 Jefferson Ave., Newport News, VA 23606
+//-----------------------------------------------------------------------------
+//
+// Description:
+//      rsvcDataInputStream that converts a byte stream into a rsvcData
+//
+// Author:  
+//      Jie Chen
+//      Jefferson Lab HPC Group
+//
+// Revision History:
+//   $Log: rsvcDataInputStream.java,v $
+//   Revision 1.1.1.1  2000/05/23 15:12:50  pal
+//   cdev_psi_1.7.2
+//
+//   Revision 1.1  1999/10/18 17:12:41  chen
+//   *** empty log message ***
+//
+//
+//
+import java.io.*;
+import java.math.*;
+
+public class rsvcDataInputStream
+{
+    // for 32 bit machine
+    public static final int _RSVC_STREAM_BYTE_UNIT = 4;
+    
+    /**
+     * Return a long word (32 bit) aligned size from original size
+     */
+    public static final int _RSVC_RNDUP (int x)
+    {
+	return ((x + _RSVC_STREAM_BYTE_UNIT - 1)/_RSVC_STREAM_BYTE_UNIT)
+	    * _RSVC_STREAM_BYTE_UNIT;
+    }
+
+    // underlying data output stream
+    private DataInputStream input = null;
+
+    /**
+     * Construct a data output stream
+     */
+    public rsvcDataInputStream (InputStream stream)
+    {
+	try {
+	    input = new DataInputStream (stream);
+	}catch (Exception e) {
+	    e.printStackTrace();
+	}
+    }
+
+    /**
+     * Read a single byte char from stream
+     */
+    public byte readByte () throws IOException
+    {
+	int tmp;
+	try {
+	    tmp = input.readInt ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	return (byte)tmp;
+    }
+
+    /**
+     * Read a value of short from the stream
+     */
+    public short readShort () throws IOException
+    {
+	int tmp;
+	try {
+	    tmp = input.readInt ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	return (short)tmp;
+    }
+
+    /**
+     * Read a value of int from stream
+     */
+    public int readInt () throws IOException
+    {
+	int tmp;
+	try {
+	    tmp = input.readInt ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	return tmp;
+    }
+
+    /**
+     * Read a value of long from stream
+     */
+    public long readLong () throws IOException
+    {
+	long tmp;
+	try {
+	    tmp = input.readLong ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	return tmp;
+    }
+
+
+    /**
+     * Read a value of float from stream
+     */
+    public float readFloat () throws IOException
+    {
+	float tmp;
+	try {
+	    tmp = input.readFloat ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	return tmp;
+    }
+
+
+    /**
+     * Read a value of double to stream
+     */
+    public double readDouble () throws IOException
+    {
+	double tmp;
+	try {
+	    tmp = input.readDouble ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	return tmp;
+    }
+
+    /**
+     * Read a string as series of byte using default encoding
+     */
+    public String readString () throws IOException
+    {
+	int len, rlen, i;
+	
+	// first find out str size
+	try {
+	    len = input.readInt ();
+	}catch (IOException e) {
+	    throw e;
+	}
+	
+	// readout next bytes of strlen 
+	byte[] tmp = new byte[len];
+	try {
+	    input.readFully (tmp, 0, len);
+	}catch (IOException e) {
+	    throw e;
+	}
+
+	// find out read length of this string by looking for the first 0
+	// in this byte array
+	rlen = 0;
+	for (i = 0; i < len; i++) {
+	    if (tmp[i] == 0)
+		break;
+	}
+	rlen = i;
+
+	return new String (tmp, 0, rlen);
+    }
+
+    /**
+     * Read a series of byte
+     */
+    public byte[] readBytes () throws IOException
+    {
+	int len;
+
+	try {
+	    len = input.readInt();
+	}catch (IOException e){
+	    throw e;
+	}
+
+	byte[] result = new byte[len];
+	try {
+	    input.readFully (result, 0, len);
+	}catch (IOException e){
+	    throw e;
+	}
+
+	return result;
+    }
+
+
+    /**
+     * Read a number of bytes: blocked until all bytes are read
+     */
+    public byte[] readBytes (int len) throws IOException
+    {
+	byte[] result = new byte[len];
+	try {
+	    input.readFully (result, 0, len);
+	}catch (IOException e){
+	    throw e;
+	}
+
+	return result;
+    }
+    
+    /**
+     * Read a time stamp from the stream
+     */
+    public rsvcTimeStamp readTimeStamp () throws IOException
+    {
+	rsvcTimeStamp ts = new rsvcTimeStamp ();
+
+	try {
+	    ts.secPastEpoch = input.readInt();
+	}catch (IOException e){
+	    throw e;
+	}
+
+	try{
+	    ts.nsec = input.readInt();
+	}catch (IOException e){
+	    throw e;
+	}
+	return ts;
+    }
+
+}