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package edu.ucsb.cs.nws.nwsprotocol;
/** The CString class implements a C-style nul-terminated character array. */
public class CString {
/** Produces a <i>howLong</i>-long (in bytes) empty CString. */
public CString(int howLong) {
this(howLong, "");
}
/**
* Produces a (<i>value</i>.length() + 1)-long CString containing
* <i>value</i>.
*/
public CString(String value) {
this(value.length() + 1, value);
}
/** Produces a <i>howLong</i>-long CString containing <i>value</i>. */
public CString(int howLong,
String value) {
byte[] valueBytes = value.getBytes();
bytes = new byte[howLong];
if(valueBytes.length >= howLong) {
System.arraycopy(valueBytes, 0, bytes, 0, howLong - 1);
bytes[howLong - 1] = 0;
}
else {
System.arraycopy(valueBytes, 0, bytes, 0, valueBytes.length);
bytes[valueBytes.length] = 0;
}
}
/**
* Produces a <i>howLong</i>-long CString initialized by reading characters
* from <i>stream</i>.
*/
public CString(int howLong,
java.io.DataInputStream stream) throws Exception {
this(howLong);
stream.readFully(bytes);
}
/**
* Produces a CString initialized by reading characters from <i>stream</i>
* until a nul is encountered. The resulting CString will be exactly large
* enough to hold this nul-terminated string.
*/
public CString(java.io.DataInputStream stream) throws Exception {
int bytesRead = 0;
byte current;
byte[] soFar = new byte[100];
do {
current = stream.readByte();
if(bytesRead == soFar.length) {
byte[] extended = new byte[bytesRead + 100];
System.arraycopy(soFar, 0, extended, 0, bytesRead);
soFar = extended;
}
soFar[bytesRead++] = current;
} while(current != 0);
bytes = new byte[bytesRead];
System.arraycopy(soFar, 0, bytes, 0, bytesRead);
}
/** Returns the contents of the CString */
public byte[] toBytes() {
return bytes;
}
/** Converts the contents of the CString to a Java string. */
public String toString() {
return new String(bytes);
}
protected byte[] bytes;
}
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