/*
* @(#)Parser.java 1.9 02/08/21
*
* Copyright (c) 1996-2002 Sun Microsystems, Inc. All rights reserved.
*/
package com.sun.media.sdp;
import java.io.*;
import java.util.*;
import com.sun.media.Log;
public class Parser {
private static Vector buffer;
public void init() {
buffer = new Vector();
}
public void ungetToken(String tokenStr) {
byte token[] = tokenStr.getBytes();
for (int i = 0; i < token.length; i++) {
buffer.insertElementAt(new Integer(token[token.length - i - 1]), 0);
}
}
public boolean getToken(ByteArrayInputStream bin, String tokenString) {
boolean found = false;
ByteArrayOutputStream bout = new ByteArrayOutputStream();
skipWhitespace(bin);
if (bin.available() > 0) {
int ch = readChar(bin);
while (ch != '=' && ch != '\n' && ch != '\r' && ch != -1) {
bout.write(ch);
ch = readChar(bin);
}
bout.write(ch);
}
String token = new String(bout.toByteArray());
if (tokenString.equals(token)) {
found = true;
} else {
ungetToken(token);
}
return found;
}
public boolean getToken(ByteArrayInputStream bin, String tokenString,
boolean mandatory) {
boolean found = getToken(bin, tokenString);
if (!found) {
if (mandatory) {
Log.warning("[SDP Parser] Token missing: " + tokenString);
}
}
return found;
}
public String getLine(ByteArrayInputStream bin) {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
if (bin.available() > 0) {
int ch = readChar(bin);
while (ch != '\n' && ch != '\r' && ch != -1) {
bout.write(ch);
ch = readChar(bin);
}
}
String line = new String(bout.toByteArray());
return line;
}
private void skipWhitespace(ByteArrayInputStream bin) {
int ch = readChar(bin);
while (ch == ' ' || ch == '\n' || ch == '\r') {
ch = readChar(bin);
}
buffer.insertElementAt(new Integer(ch), 0);
}
public int readChar(ByteArrayInputStream bin) {
int ch;
if (buffer.size() > 0) {
ch = ((Integer) buffer.elementAt(0)).intValue();
buffer.removeElementAt(0);
} else {
ch = bin.read();
}
return ch;
}
}
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