michael@0: const charset = "GB2312";
michael@0: const ScriptableUnicodeConverter =
michael@0: 	Components.Constructor("@mozilla.org/intl/scriptableunicodeconverter",
michael@0: 			       "nsIScriptableUnicodeConverter");
michael@0: var gConverter;
michael@0: 
michael@0: function error(inString, outString, msg) {
michael@0:     var dispIn = "";
michael@0:     var dispOut = "";
michael@0:     var i;
michael@0:     for (i = 0; i < inString.length; ++i) {
michael@0: 	dispIn += " x" + inString.charCodeAt(i).toString(16);
michael@0:     }
michael@0:     if (outString.length == 0) {
michael@0: 	dispOut = "<empty>";
michael@0:     } else {
michael@0: 	for (i = 0; i < outString.length; ++i) {
michael@0: 	    dispOut += " x" + outString.charCodeAt(i).toString(16);
michael@0: 	}
michael@0:     }
michael@0:     dump("\"" + dispIn + "\" ==> \"" + dispOut + "\"\n");
michael@0:     do_throw("security risk: " + msg);
michael@0: }
michael@0: 
michael@0: function IsASCII(charCode) {
michael@0:     return (charCode <= 0x7e);
michael@0: }
michael@0: 
michael@0: function test(inString) {
michael@0:     var outString = gConverter.ConvertToUnicode(inString) +
michael@0: 	            gConverter.Finish();
michael@0: 
michael@0:     var outLen = outString.length;
michael@0:     for (var pos = 1; pos < 3; ++pos) {
michael@0: 	outPos = outLen - (9 - pos);
michael@0: 	if (outPos < 0) {
michael@0: 	    outPos = 0;
michael@0: 	}
michael@0: 	c0 = inString.charCodeAt(0);
michael@0: 	c1 = inString.charCodeAt(1);
michael@0: 	c2 = inString.charCodeAt(2);
michael@0: 	c3 = inString.charCodeAt(3);
michael@0: 	if (IsASCII(inString.charCodeAt(pos)) && 
michael@0: 	    !(outString.charCodeAt(outPos) == inString.charCodeAt(pos) ||
michael@0: 	      (outString.charCodeAt(outPos) != 0xFFFD) ||
michael@0: 	      // legal 4 byte range
michael@0: 	      (0x81 <= c0 && c0 <= 0xfe &&
michael@0: 	       0x30 <= c1 && c1 <= 0x39 &&
michael@0: 	       0x81 <= c2 && c2 <= 0xfe &&
michael@0: 	       0x30 <= c3 && c3 <= 0x39))) {
michael@0: 	    dump("pos = " + pos + "; outPos = " + outPos + "\n");
michael@0: 	    error(inString, outString, "ASCII input eaten");
michael@0: 	}
michael@0:     }
michael@0: }
michael@0: 
michael@0: function run_test() {
michael@0:     gConverter = new ScriptableUnicodeConverter();
michael@0:     gConverter.charset = charset;
michael@0: 
michael@0:     var byte1, byte2, byte3, byte4;
michael@0: 
michael@0:     // 2-byte
michael@0:     for (byte1 = 1; byte1 < 0x100; ++byte1) {
michael@0: 	for (byte2 = 1; byte2 < 0x100; ++byte2) {
michael@0: 	    test(String.fromCharCode(byte1, byte2) + "    foo");
michael@0: 	}
michael@0:     }
michael@0:     // 4-byte (limited)
michael@0:     for (byte1 = 0x80; byte1 < 0x90; ++byte1) {
michael@0: 	for (byte2 = 0x20; byte2 < 0x40; ++byte2) {
michael@0: 	    for (byte3 = 0x80; byte3 < 0x90; ++byte3) {
michael@0: 		for (byte4 = 0x20; byte4 < 0x40; ++byte4) {
michael@0: 		    test(String.fromCharCode(byte1, byte2, byte3, byte4) + "  foo");
michael@0: 		}
michael@0: 	    }
michael@0: 	}
michael@0:     }
michael@0: }