gecko-dev/intl/uconv/tests/unit/test_bug715319.dbcs.js

// 2-byte charsets:
const charsets = [ "Big5", "EUC-KR", "x-euc-tw", "x-johab" ]
const ScriptableUnicodeConverter =
	Components.Constructor("@mozilla.org/intl/scriptableunicodeconverter",
			       "nsIScriptableUnicodeConverter");
var gConverter;

function error(inString, outString, msg) {
    var dispIn = "";
    var dispOut = "";
    var i;
    for (i = 0; i < inString.length; ++i) {
	dispIn += " x" + inString.charCodeAt(i).toString(16);
    }
    if (outString.length == 0) {
	dispOut = "<empty>";
    } else {
	for (i = 0; i < outString.length; ++i) {
	    dispOut += " x" + outString.charCodeAt(i).toString(16);
	}
    }
    dump("\"" + dispIn + "\" ==> \"" + dispOut + "\"\n");
    do_throw("security risk: " + msg);
}

function IsASCII(charCode) {
    return (charCode <= 0x7e);
}

function test(inString) {
    var outString = gConverter.ConvertToUnicode(inString) +
	            gConverter.Finish();

    var outLen = outString.length;

    if (IsASCII(inString.charCodeAt(1)) && 
	(outLen < 4 || outString.charCodeAt(outLen - 4) == 0xFFFD)) {
	error(inString, outString, "ASCII input eaten in " + gConverter.charset);
    }
}

function run_test() {
    gConverter = new ScriptableUnicodeConverter();
    for (var i = 0; i < charsets.length; ++i) {
	gConverter.charset = charsets[i];

	var byte1, byte2;
	for (byte1 = 1; byte1 < 0x100; ++byte1) {
	    for (byte2 = 1; byte2 < 0x100; ++byte2) {
		test(String.fromCharCode(byte1, byte2) + "foo");
	    }
	}
    }
}