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+<!doctype html>
+<!-- Originally developed by Aryeh Gregor, funded by Google.  Copyright belongs
+to Google. -->
+<title>atob()/btoa() tests</title>
+<meta charset=utf-8>
+<div id=log></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+/**
+ * btoa() as defined by the HTML5 spec, which mostly just references RFC4648.
+ */
+function mybtoa(s) {
+    // String conversion as required by WebIDL.
+    s = String(s);
+
+    // "The btoa() method must throw an INVALID_CHARACTER_ERR exception if the
+    // method's first argument contains any character whose code point is
+    // greater than U+00FF."
+    for (var i = 0; i < s.length; i++) {
+        if (s.charCodeAt(i) > 255) {
+            return "INVALID_CHARACTER_ERR";
+        }
+    }
+
+    var out = "";
+    for (var i = 0; i < s.length; i += 3) {
+        var groupsOfSix = [undefined, undefined, undefined, undefined];
+        groupsOfSix[0] = s.charCodeAt(i) >> 2;
+        groupsOfSix[1] = (s.charCodeAt(i) & 0x03) << 4;
+        if (s.length > i + 1) {
+            groupsOfSix[1] |= s.charCodeAt(i + 1) >> 4;
+            groupsOfSix[2] = (s.charCodeAt(i + 1) & 0x0f) << 2;
+        }
+        if (s.length > i + 2) {
+            groupsOfSix[2] |= s.charCodeAt(i + 2) >> 6;
+            groupsOfSix[3] = s.charCodeAt(i + 2) & 0x3f;
+        }
+        for (var j = 0; j < groupsOfSix.length; j++) {
+            if (typeof groupsOfSix[j] == "undefined") {
+                out += "=";
+            } else {
+                out += btoaLookup(groupsOfSix[j]);
+            }
+        }
+    }
+    return out;
+}
+
+/**
+ * Lookup table for mybtoa(), which converts a six-bit number into the
+ * corresponding ASCII character.
+ */
+function btoaLookup(idx) {
+    if (idx < 26) {
+        return String.fromCharCode(idx + 'A'.charCodeAt(0));
+    }
+    if (idx < 52) {
+        return String.fromCharCode(idx - 26 + 'a'.charCodeAt(0));
+    }
+    if (idx < 62) {
+        return String.fromCharCode(idx - 52 + '0'.charCodeAt(0));
+    }
+    if (idx == 62) {
+        return '+';
+    }
+    if (idx == 63) {
+        return '/';
+    }
+    // Throw INVALID_CHARACTER_ERR exception here -- won't be hit in the tests.
+}
+
+/**
+ * Implementation of atob() according to the HTML spec, except that instead of
+ * throwing INVALID_CHARACTER_ERR we return null.
+ */
+function myatob(input) {
+    // WebIDL requires DOMStrings to just be converted using ECMAScript
+    // ToString, which in our case amounts to calling String().
+    input = String(input);
+
+    // "Remove all space characters from input."
+    input = input.replace(/[ \t\n\f\r]/g, "");
+
+    // "If the length of input divides by 4 leaving no remainder, then: if
+    // input ends with one or two U+003D EQUALS SIGN (=) characters, remove
+    // them from input."
+    if (input.length % 4 == 0 && /==?$/.test(input)) {
+        input = input.replace(/==?$/, "");
+    }
+
+    // "If the length of input divides by 4 leaving a remainder of 1, throw an
+    // INVALID_CHARACTER_ERR exception and abort these steps."
+    //
+    // "If input contains a character that is not in the following list of
+    // characters and character ranges, throw an INVALID_CHARACTER_ERR
+    // exception and abort these steps:
+    //
+    // U+002B PLUS SIGN (+)
+    // U+002F SOLIDUS (/)
+    // U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9)
+    // U+0041 LATIN CAPITAL LETTER A to U+005A LATIN CAPITAL LETTER Z
+    // U+0061 LATIN SMALL LETTER A to U+007A LATIN SMALL LETTER Z"
+    if (input.length % 4 == 1
+    || !/^[+/0-9A-Za-z]*$/.test(input)) {
+        return null;
+    }
+
+    // "Let output be a string, initially empty."
+    var output = "";
+
+    // "Let buffer be a buffer that can have bits appended to it, initially
+    // empty."
+    //
+    // We append bits via left-shift and or.  accumulatedBits is used to track
+    // when we've gotten to 24 bits.
+    var buffer = 0;
+    var accumulatedBits = 0;
+
+    // "While position does not point past the end of input, run these
+    // substeps:"
+    for (var i = 0; i < input.length; i++) {
+        // "Find the character pointed to by position in the first column of
+        // the following table. Let n be the number given in the second cell of
+        // the same row."
+        //
+        // "Append to buffer the six bits corresponding to number, most
+        // significant bit first."
+        //
+        // atobLookup() implements the table from the spec.
+        buffer <<= 6;
+        buffer |= atobLookup(input[i]);
+
+        // "If buffer has accumulated 24 bits, interpret them as three 8-bit
+        // big-endian numbers. Append the three characters with code points
+        // equal to those numbers to output, in the same order, and then empty
+        // buffer."
+        accumulatedBits += 6;
+        if (accumulatedBits == 24) {
+            output += String.fromCharCode((buffer & 0xff0000) >> 16);
+            output += String.fromCharCode((buffer & 0xff00) >> 8);
+            output += String.fromCharCode(buffer & 0xff);
+            buffer = accumulatedBits = 0;
+        }
+
+        // "Advance position by one character."
+    }
+
+    // "If buffer is not empty, it contains either 12 or 18 bits. If it
+    // contains 12 bits, discard the last four and interpret the remaining
+    // eight as an 8-bit big-endian number. If it contains 18 bits, discard the
+    // last two and interpret the remaining 16 as two 8-bit big-endian numbers.
+    // Append the one or two characters with code points equal to those one or
+    // two numbers to output, in the same order."
+    if (accumulatedBits == 12) {
+        buffer >>= 4;
+        output += String.fromCharCode(buffer);
+    } else if (accumulatedBits == 18) {
+        buffer >>= 2;
+        output += String.fromCharCode((buffer & 0xff00) >> 8);
+        output += String.fromCharCode(buffer & 0xff);
+    }
+
+    // "Return output."
+    return output;
+}
+
+/**
+ * A lookup table for atob(), which converts an ASCII character to the
+ * corresponding six-bit number.
+ */
+function atobLookup(chr) {
+    if (/[A-Z]/.test(chr)) {
+        return chr.charCodeAt(0) - "A".charCodeAt(0);
+    }
+    if (/[a-z]/.test(chr)) {
+        return chr.charCodeAt(0) - "a".charCodeAt(0) + 26;
+    }
+    if (/[0-9]/.test(chr)) {
+        return chr.charCodeAt(0) - "0".charCodeAt(0) + 52;
+    }
+    if (chr == "+") {
+        return 62;
+    }
+    if (chr == "/") {
+        return 63;
+    }
+    // Throw exception; should not be hit in tests
+}
+
+function btoaException(input) {
+    input = String(input);
+    for (var i = 0; i < input.length; i++) {
+        if (input.charCodeAt(i) > 255) {
+            return true;
+        }
+    }
+    return false;
+}
+
+function testBtoa(input) {
+    // "The btoa() method must throw an INVALID_CHARACTER_ERR exception if the
+    // method's first argument contains any character whose code point is
+    // greater than U+00FF."
+    var normalizedInput = String(input);
+    for (var i = 0; i < normalizedInput.length; i++) {
+        if (normalizedInput.charCodeAt(i) > 255) {
+            assert_throws("InvalidCharacterError", function() { btoa(input); },
+                "Code unit " + i + " has value " + normalizedInput.charCodeAt(i) + ", which is greater than 255");
+            return;
+        }
+    }
+    assert_equals(btoa(input), mybtoa(input));
+    assert_equals(atob(btoa(input)), String(input), "atob(btoa(input)) must be the same as String(input)");
+}
+
+var tests = ["עברית", "", "ab", "abc", "abcd", "abcde",
+    // This one is thrown in because IE9 seems to fail atob(btoa()) on it.  Or
+    // possibly to fail btoa().  I actually can't tell what's happening here,
+    // but it doesn't hurt.
+    "\xff\xff\xc0",
+    // Is your DOM implementation binary-safe?
+    "\0a", "a\0b",
+    // WebIDL tests.
+    undefined, null, 7, 12, 1.5, true, false, NaN, +Infinity, -Infinity, 0, -0,
+    {toString: function() { return "foo" }},
+];
+for (var i = 0; i < 258; i++) {
+    tests.push(String.fromCharCode(i));
+}
+tests.push(String.fromCharCode(10000));
+tests.push(String.fromCharCode(65534));
+tests.push(String.fromCharCode(65535));
+
+// This is supposed to be U+10000.
+tests.push(String.fromCharCode(0xd800, 0xdc00));
+tests = tests.map(
+    function(elem) {
+        var expected = mybtoa(elem);
+        if (expected === "INVALID_CHARACTER_ERR") {
+            return ["btoa("  + format_value(elem) + ") must raise INVALID_CHARACTER_ERR", elem];
+        }
+        return ["btoa(" + format_value(elem) + ") == " + format_value(mybtoa(elem)), elem];
+    }
+);
+
+var everything = "";
+for (var i = 0; i < 256; i++) {
+    everything += String.fromCharCode(i);
+}
+tests.push(["btoa(first 256 code points concatenated)", everything]);
+
+generate_tests(testBtoa, tests);
+
+function testAtob(input) {
+    var expected = myatob(input);
+    if (expected === null) {
+        assert_throws("InvalidCharacterError", function() { atob(input) });
+        return;
+    }
+
+    assert_equals(atob(input), expected);
+}
+
+var tests = ["", "abcd", " abcd", "abcd ", " abcd===", "abcd=== ",
+    "abcd ===", "a", "ab", "abc", "abcde", String.fromCharCode(0xd800, 0xdc00),
+    "=", "==", "===", "====", "=====",
+    "a=", "a==", "a===", "a====", "a=====",
+    "ab=", "ab==", "ab===", "ab====", "ab=====",
+    "abc=", "abc==", "abc===", "abc====", "abc=====",
+    "abcd=", "abcd==", "abcd===", "abcd====", "abcd=====",
+    "abcde=", "abcde==", "abcde===", "abcde====", "abcde=====",
+    "=a", "=a=", "a=b", "a=b=", "ab=c", "ab=c=", "abc=d", "abc=d=",
+    // With whitespace
+    "ab\tcd", "ab\ncd", "ab\fcd", "ab\rcd", "ab cd", "ab\u00a0cd",
+    "ab\t\n\f\r cd", " \t\n\f\r ab\t\n\f\r cd\t\n\f\r ",
+    "ab\t\n\f\r =\t\n\f\r =\t\n\f\r ",
+    // Test if any bits are set at the end.  These should all be fine, since
+    // they end with A, which becomes 0:
+    "A", "/A", "//A", "///A", "////A",
+    // These are all bad, since they end in / (= 63, all bits set) but their
+    // length isn't a multiple of four characters, so they can't be output by
+    // btoa().  Thus one might expect some UAs to throw exceptions or otherwise
+    // object, since they could never be output by btoa(), so they're good to
+    // test.
+    "/", "A/", "AA/", "AAAA/",
+    // But this one is possible:
+    "AAA/",
+    // Binary-safety tests
+    "\0nonsense", "abcd\0nonsense",
+    // WebIDL tests
+    undefined, null, 7, 12, 1.5, true, false, NaN, +Infinity, -Infinity, 0, -0,
+    {toString: function() { return "foo" }},
+    {toString: function() { return "abcd" }},
+];
+tests = tests.map(
+    function(elem) {
+        if (myatob(elem) === null) {
+            return ["atob(" + format_value(elem) + ") must raise InvalidCharacterError", elem];
+        }
+        return ["atob(" + format_value(elem) + ") == " + format_value(myatob(elem)), elem];
+    }
+);
+
+generate_tests(testAtob, tests);
+</script>