peterprokop · October 7, 2021 14:28
diff --git a/test.html b/test.html
 <!DOCTYPE html>
 <html>

 <script type="text/javascript">
    //<![CDATA[
    function randomArray(length, max) {
        return Array.apply(null, Array(length)).map(function() {
            return Math.round(Math.random() * max);
        });
    }

    function regularBase64FromURLSafe(safe) {
        regular = safe.replace(/-/g, "+")
            .replace(/_/g, "/");

        for (i = 0; i < regular.length % 4; i++) {
            regular += "=";
        }

        return regular;
    }

    function urlSafeBase64FromRegular(regular) {
        return regular.replace(/\+/g, "-")
            .replace(/\//g, "_")
            .replace(/=/g, "");
    }

    /// Converts UInt8 array to URL-safe Base64-encoded string
    function _uint8ToBase64 (uint8arr) {
        const regularB64 = btoa(String.fromCharCode.apply(null, uint8arr));
        return urlSafeBase64FromRegular(regularB64);
    }

    /// Converts URL-safe Base64-encoded string to UInt8 array
    function _b64ToByteArray (b64) {
        const regularB64 = regularBase64FromURLSafe(b64);
        return Uint8Array.from(atob(regularB64), c => c.charCodeAt(0));
    }

    var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

    var PLUS = '+'.charCodeAt(0)
    var SLASH = '/'.charCodeAt(0)
    var NUMBER = '0'.charCodeAt(0)
    var LOWER = 'a'.charCodeAt(0)
    var UPPER = 'A'.charCodeAt(0)
    var PLUS_URL_SAFE = '-'.charCodeAt(0)
    var SLASH_URL_SAFE = '_'.charCodeAt(0)

    function decode (elt) {
        var code = elt.charCodeAt(0)
        if (code === PLUS || code === PLUS_URL_SAFE) return 62 // '+'
        if (code === SLASH || code === SLASH_URL_SAFE) return 63 // '/'
        if (code < NUMBER) return -1 // no match
        if (code < NUMBER + 10) return code - NUMBER + 26 + 26
        if (code < UPPER + 26) return code - UPPER
        if (code < LOWER + 26) return code - LOWER + 26
    }

    function b64ToByteArray (b64) {
        var i, j, l, tmp, placeHolders, arr

        // if (b64.length % 4 > 0) {
        //   throw new Error('Invalid string. Length must be a multiple of 4')
        // }

        // the number of equal signs (place holders)
        // if there are two placeholders, than the two characters before it
        // represent one byte
        // if there is only one, then the three characters before it represent 2 bytes
        // this is just a cheap hack to not do indexOf twice
        var len = b64.length
        placeHolders = b64.charAt(len - 2) === '=' ? 2 : b64.charAt(len - 1) === '=' ? 1 : 0

        // base64 is 4/3 + up to two characters of the original data
        arr = new Uint8Array(b64.length * 3 / 4 - placeHolders)

        // if there are placeholders, only get up to the last complete 4 chars
        l = placeHolders > 0 ? b64.length - 4 : b64.length

        var L = 0

        function push (v) {
        arr[L++] = v
        }

        for (i = 0, j = 0; i < l; i += 4, j += 3) {
        tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
        push((tmp & 0xFF0000) >> 16)
        push((tmp & 0xFF00) >> 8)
        push(tmp & 0xFF)
        }

        if (placeHolders === 2) {
        tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
        push(tmp & 0xFF)
        } else if (placeHolders === 1) {
        tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
        push((tmp >> 8) & 0xFF)
        push(tmp & 0xFF)
        }

        return arr
    }


    function uint8ToBase64 (uint8) {
        var i
        var extraBytes = uint8.length % 3 // if we have 1 byte left, pad 2 bytes
        var output = ''
        var temp, length

        function encode (num) {
        return lookup.charAt(num)
        }

        function tripletToBase64 (num) {
        return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
        }

        // go through the array every three bytes, we'll deal with trailing stuff later
        for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
            temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
            output += tripletToBase64(temp)
        }


        // pad the end with zeros, but make sure to not forget the extra bytes
        switch (extraBytes) {
        case 1:
            temp = uint8[uint8.length - 1]
            output += encode(temp >> 2)
            output += encode((temp << 4) & 0x3F)
            output += '=='
            break
        case 2:
            temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
            output += encode(temp >> 10)
            output += encode((temp >> 4) & 0x3F)
            output += encode((temp << 2) & 0x3F)
            output += '='
            break
        default:
            break
        }

        return output.replace(/\+/g, "-")
            .replace(/\//g, "_")
            .replace(/=/g, "");
    }


    function arrayEquals(a, b) {
        for (var i = 0; i < a.length; i++) {
            if (a[i] != b[i]) {
                console.log("Not equal", a[i], b[i]);
                return false;
            }
        }
        return true;
    }


    function test() {
        for (var j = 0; j <= 10000; j++) {
            // console.log("Working", j);
            const arrayLength = Math.round(Math.random() * 1000);
            var arr = randomArray(arrayLength, 255);
            var first = _uint8ToBase64(arr);
            var second = uint8ToBase64(arr);        

            if (first != second) {
                console.log("Not equal!")
                console.log(first);
                console.log(second);
            }

            var decodedFirst = _b64ToByteArray(first);
            var decodedSecond = b64ToByteArray(second);

            // console.log(decodedFirst);
            // console.log(decodedSecond);

            if(!arrayEquals(decodedFirst, decodedSecond)) {
                console.log("Not equal!")
                console.log(decodedFirst);
                console.log(decodedSecond);
            }
        }
    }

    try {
        test();
    } catch (error) {
        console.error(error);
    }

    console.log("Done");
    //]]>
    </script>
 </html>
	<!DOCTYPE html>
	<html>

	<script type="text/javascript">
	//<![CDATA[
	function randomArray(length, max) {
	return Array.apply(null, Array(length)).map(function() {
	return Math.round(Math.random() * max);
	});
	}

	function regularBase64FromURLSafe(safe) {
	regular = safe.replace(/-/g, "+")
	.replace(/_/g, "/");

	for (i = 0; i < regular.length % 4; i++) {
	regular += "=";
	}

	return regular;
	}

	function urlSafeBase64FromRegular(regular) {
	return regular.replace(/\+/g, "-")
	.replace(/\//g, "_")
	.replace(/=/g, "");
	}

	/// Converts UInt8 array to URL-safe Base64-encoded string
	function _uint8ToBase64 (uint8arr) {
	const regularB64 = btoa(String.fromCharCode.apply(null, uint8arr));
	return urlSafeBase64FromRegular(regularB64);
	}

	/// Converts URL-safe Base64-encoded string to UInt8 array
	function _b64ToByteArray (b64) {
	const regularB64 = regularBase64FromURLSafe(b64);
	return Uint8Array.from(atob(regularB64), c => c.charCodeAt(0));
	}

	var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

	var PLUS = '+'.charCodeAt(0)
	var SLASH = '/'.charCodeAt(0)
	var NUMBER = '0'.charCodeAt(0)
	var LOWER = 'a'.charCodeAt(0)
	var UPPER = 'A'.charCodeAt(0)
	var PLUS_URL_SAFE = '-'.charCodeAt(0)
	var SLASH_URL_SAFE = '_'.charCodeAt(0)

	function decode (elt) {
	var code = elt.charCodeAt(0)
	if (code === PLUS \|\| code === PLUS_URL_SAFE) return 62 // '+'
	if (code === SLASH \|\| code === SLASH_URL_SAFE) return 63 // '/'
	if (code < NUMBER) return -1 // no match
	if (code < NUMBER + 10) return code - NUMBER + 26 + 26
	if (code < UPPER + 26) return code - UPPER
	if (code < LOWER + 26) return code - LOWER + 26
	}

	function b64ToByteArray (b64) {
	var i, j, l, tmp, placeHolders, arr

	// if (b64.length % 4 > 0) {
	// throw new Error('Invalid string. Length must be a multiple of 4')
	// }

	// the number of equal signs (place holders)
	// if there are two placeholders, than the two characters before it
	// represent one byte
	// if there is only one, then the three characters before it represent 2 bytes
	// this is just a cheap hack to not do indexOf twice
	var len = b64.length
	placeHolders = b64.charAt(len - 2) === '=' ? 2 : b64.charAt(len - 1) === '=' ? 1 : 0

	// base64 is 4/3 + up to two characters of the original data
	arr = new Uint8Array(b64.length * 3 / 4 - placeHolders)

	// if there are placeholders, only get up to the last complete 4 chars
	l = placeHolders > 0 ? b64.length - 4 : b64.length

	var L = 0

	function push (v) {
	arr[L++] = v
	}

	for (i = 0, j = 0; i < l; i += 4, j += 3) {
	tmp = (decode(b64.charAt(i)) << 18) \| (decode(b64.charAt(i + 1)) << 12) \| (decode(b64.charAt(i + 2)) << 6) \| decode(b64.charAt(i + 3))
	push((tmp & 0xFF0000) >> 16)
	push((tmp & 0xFF00) >> 8)
	push(tmp & 0xFF)
	}

	if (placeHolders === 2) {
	tmp = (decode(b64.charAt(i)) << 2) \| (decode(b64.charAt(i + 1)) >> 4)
	push(tmp & 0xFF)
	} else if (placeHolders === 1) {
	tmp = (decode(b64.charAt(i)) << 10) \| (decode(b64.charAt(i + 1)) << 4) \| (decode(b64.charAt(i + 2)) >> 2)
	push((tmp >> 8) & 0xFF)
	push(tmp & 0xFF)
	}

	return arr
	}


	function uint8ToBase64 (uint8) {
	var i
	var extraBytes = uint8.length % 3 // if we have 1 byte left, pad 2 bytes
	var output = ''
	var temp, length

	function encode (num) {
	return lookup.charAt(num)
	}

	function tripletToBase64 (num) {
	return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
	}

	// go through the array every three bytes, we'll deal with trailing stuff later
	for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
	temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
	output += tripletToBase64(temp)
	}


	// pad the end with zeros, but make sure to not forget the extra bytes
	switch (extraBytes) {
	case 1:
	temp = uint8[uint8.length - 1]
	output += encode(temp >> 2)
	output += encode((temp << 4) & 0x3F)
	output += '=='
	break
	case 2:
	temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
	output += encode(temp >> 10)
	output += encode((temp >> 4) & 0x3F)
	output += encode((temp << 2) & 0x3F)
	output += '='
	break
	default:
	break
	}

	return output.replace(/\+/g, "-")
	.replace(/\//g, "_")
	.replace(/=/g, "");
	}


	function arrayEquals(a, b) {
	for (var i = 0; i < a.length; i++) {
	if (a[i] != b[i]) {
	console.log("Not equal", a[i], b[i]);
	return false;
	}
	}
	return true;
	}


	function test() {
	for (var j = 0; j <= 10000; j++) {
	// console.log("Working", j);
	const arrayLength = Math.round(Math.random() * 1000);
	var arr = randomArray(arrayLength, 255);
	var first = _uint8ToBase64(arr);
	var second = uint8ToBase64(arr);

	if (first != second) {
	console.log("Not equal!")
	console.log(first);
	console.log(second);
	}

	var decodedFirst = _b64ToByteArray(first);
	var decodedSecond = b64ToByteArray(second);

	// console.log(decodedFirst);
	// console.log(decodedSecond);

	if(!arrayEquals(decodedFirst, decodedSecond)) {
	console.log("Not equal!")
	console.log(decodedFirst);
	console.log(decodedSecond);
	}
	}
	}

	try {
	test();
	} catch (error) {
	console.error(error);
	}

	console.log("Done");
	//]]>
	</script>
	</html>