/**
* Write the TDS packet to the network.
*
* @param last Set to 1 if this is the last packet else 0.
* @throws IOException
*/
private void putPacket(int last) throws IOException {
if (isClosed) {
throw new IOException("RequestStream is closed");
}
buffer[0] = pktType;
buffer[1] = (byte) last; // last segment indicator
buffer[2] = (byte) (bufferPtr >> 8);
buffer[3] = (byte) bufferPtr;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = (byte) ((socket.getTdsVersion() >= Driver.TDS70) ? 1 : 0);
buffer[7] = 0;
if (Logger.isActive()) {
Logger.logPacket(streamId, false, buffer);
}
buffer = socket.sendNetPacket(streamId, buffer);
bufferPtr = TdsCore.PKT_HDR_LEN;
}
/**
* Write a String to the output stream as translated bytes.
*
* @param s The String to write.
* @throws IOException
*/
void writeAscii(String s) throws IOException {
String charsetName = socket.getCharset();
if (charsetName != null) {
try {
write(s.getBytes(charsetName));
} catch (UnsupportedEncodingException e) {
write(s.getBytes());
}
} else {
write(s.getBytes());
}
}
/**
* Copy the contents of a Reader stream to the server as bytes.
*
* <p>NB. Only reliable where the charset is single byte.
*
* @param in The Reader object with the data.
* @param length The length of the data in bytes.
* @throws IOException
*/
void writeReaderBytes(Reader in, int length) throws IOException {
char buffer[] = new char[1024];
for (int i = 0; i < length; ) {
int result = in.read(buffer);
if (result == -1) {
throw new java.io.IOException("Data in stream less than specified by length");
} else if (i + result > length) {
throw new java.io.IOException("More data in stream than specified by length");
}
write(Support.encodeString(socket.getCharset(), new String(buffer, 0, result)));
i += result;
}
}
/**
* Write a String object to the output stream. If the TDS version is >= 7.0 write a UNICODE string
* otherwise wrote a translated byte stream.
*
* @param s The String to write.
* @throws IOException
*/
void write(String s) throws IOException {
if (socket.getTdsVersion() >= Driver.TDS70) {
int len = s.length();
for (int i = 0; i < len; ++i) {
int c = s.charAt(i);
if (bufferPtr == buffer.length) {
putPacket(0);
}
buffer[bufferPtr++] = (byte) c;
if (bufferPtr == buffer.length) {
putPacket(0);
}
buffer[bufferPtr++] = (byte) (c >> 8);
}
} else {
writeAscii(s);
}
}
/**
* Retrieve the TDS version number.
*
* @return The TDS version as an <code>int</code>.
*/
int getTdsVersion() {
return socket.getTdsVersion();
}