/**
* Generic parsing routine that can parse out a Quoted-String, Literal or Atom and return the
* parsed token as a String or a ByteArray. Errors or NIL data will return null.
*/
private Object parseString(boolean parseAtoms, boolean returnString) {
byte b;
// Skip leading spaces
skipSpaces();
b = buffer[index];
if (b == '"') { // QuotedString
index++; // skip the quote
int start = index;
int copyto = index;
while ((b = buffer[index]) != '"') {
if (b == '\\') // skip escaped byte
index++;
if (index != copyto) { // only copy if we need to
// Beware: this is a destructive copy. I'm
// pretty sure this is OK, but ... ;>
buffer[copyto] = buffer[index];
}
copyto++;
index++;
}
index++; // skip past the terminating quote
if (returnString) return ASCIIUtility.toString(buffer, start, copyto);
else return new ByteArray(buffer, start, copyto - start);
} else if (b == '{') { // Literal
int start = ++index; // note the start position
while (buffer[index] != '}') index++;
int count = 0;
try {
count = ASCIIUtility.parseInt(buffer, start, index);
} catch (NumberFormatException nex) {
// throw new ParsingException();
return null;
}
start = index + 3; // skip "}\r\n"
index = start + count; // position index to beyond the literal
if (returnString) // return as String
return ASCIIUtility.toString(buffer, start, start + count);
else return new ByteArray(buffer, start, count);
} else if (parseAtoms) { // parse as an ATOM
int start = index; // track this, so that we can use to
// creating ByteArrayInputStream below.
String s = readAtom();
if (returnString) return s;
else // *very* unlikely
return new ByteArray(buffer, start, index);
} else if (b == 'N' || b == 'n') { // the only valid value is 'NIL'
index += 3; // skip past NIL
return null;
}
return null; // Error
}
/**
* Extract an integer, starting at the current position. Updates the internal index to beyond the
* number. Returns -1 if a number was not found.
*
* @return a number
*/
public int readNumber() {
// Skip leading spaces
skipSpaces();
int start = index;
while (index < size && Character.isDigit((char) buffer[index])) index++;
if (index > start) {
try {
return ASCIIUtility.parseInt(buffer, start, index);
} catch (NumberFormatException nex) {
}
}
return -1;
}