/**
* ** Reads a line from the specified socket's input stream ** @param socket The socket to read a
* line from ** @param maxLen The maximum length of of the line to read ** @param sb The string
* buffer to use ** @throws IOException if an error occurs or the server has stopped
*/
protected static String socketReadLine(Socket socket, int maxLen, StringBuffer sb)
throws IOException {
if (socket != null) {
int dataLen = 0;
StringBuffer data = (sb != null) ? sb : new StringBuffer();
InputStream input = socket.getInputStream();
while ((maxLen < 0) || (maxLen > dataLen)) {
int ch = input.read();
// Print.logInfo("ReadLine char: " + ch);
if (ch < 0) {
// this means that the server has stopped
throw new IOException("End of input");
} else if (ch == LineTerminatorChar) {
// include line terminator in String
data.append((char) ch);
dataLen++;
break;
} else {
// append character
data.append((char) ch);
dataLen++;
}
}
return data.toString();
} else {
return null;
}
}
/**
* ** Reads the specified number of bytes from the specifed socket ** @param socket The socket
* from which bytes are read ** @param length The number of bytes to read from the socket
* ** @throws IOException if an error occured or the server has stopped
*/
protected static byte[] socketReadBytes(Socket socket, int length) throws IOException {
if (socket == null) {
return null;
} else if (length <= 0) {
return new byte[0];
} else {
int dataLen = 0;
byte data[] = new byte[length];
InputStream input = socket.getInputStream();
while (dataLen < length) {
int ch = input.read();
if (ch < 0) {
// this means that the server has stopped
throw new IOException("End of input");
} else {
data[dataLen] = (byte) ch;
dataLen++;
}
}
return data;
}
}
/**
* ** Reads the bytes from the specifed socket until an eod-of-stream error occurs, or ** until
* the maximum number of bytes has bee read. ** @param socket The socket from which bytes are read
* ** @param baos The ByteArrayOutputStream to which the bytes are written ** @param maxLength The
* number of bytes to read from the socket ** @return The number of bytes read if no exception has
* occurred ** @throws IOException if an error occured or the server has stopped
*/
protected static int socketReadBytes(Socket socket, ByteArrayOutputStream baos, int maxLength)
throws IOException {
if (socket == null) {
return 0;
} else if (maxLength == 0) {
return 0;
} else {
int dataLen = 0;
InputStream input = socket.getInputStream();
while ((maxLength < 0) || (dataLen < maxLength)) {
int ch = input.read();
if (ch < 0) {
// we've reached the end of input
return dataLen;
} else {
if (baos != null) {
baos.write(ch);
}
dataLen++;
}
}
return dataLen;
}
}