367 lines
12 KiB
JavaScript
367 lines
12 KiB
JavaScript
'use strict';
|
|
|
|
/*@
|
|
Ox.encodeBase26 <b> Encode a number as bijective base26
|
|
See <a href="http://en.wikipedia.org/wiki/Bijective_numeration">
|
|
Bijective numeration</a>.
|
|
> Ox.encodeBase26(0)
|
|
''
|
|
> Ox.encodeBase26(1)
|
|
'A'
|
|
> Ox.encodeBase26(26)
|
|
'Z'
|
|
> Ox.encodeBase26(27)
|
|
'AA'
|
|
> Ox.encodeBase26(4461)
|
|
'FOO'
|
|
@*/
|
|
Ox.encodeBase26 = function(number) {
|
|
var string = '';
|
|
while (number) {
|
|
string = String.fromCharCode(65 + (number - 1) % 26) + string;
|
|
number = Math.floor((number - 1) / 26);
|
|
}
|
|
return string;
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeBase26 <f> Decodes a bijective base26-encoded number
|
|
See <a href="http://en.wikipedia.org/wiki/Bijective_numeration">
|
|
Bijective numeration</a>.
|
|
> Ox.decodeBase26('foo')
|
|
4461
|
|
@*/
|
|
Ox.decodeBase26 = function(string) {
|
|
return string.toUpperCase().split('').reverse().reduce(function(p, c, i) {
|
|
return p + (c.charCodeAt(0) - 64) * Math.pow(26, i);
|
|
}, 0);
|
|
};
|
|
|
|
/*@
|
|
Ox.encodeBase32 <b> Encode a number as base32
|
|
See <a href="http://www.crockford.com/wrmg/base32.html">Base 32</a>.
|
|
> Ox.encodeBase32(15360)
|
|
'F00'
|
|
> Ox.encodeBase32(33819)
|
|
'110V'
|
|
@*/
|
|
Ox.encodeBase32 = function(number) {
|
|
return Ox.map(number.toString(32), function(char) {
|
|
return Ox.BASE_32_DIGITS[parseInt(char, 32)];
|
|
});
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeBase32 <f> Decodes a base32-encoded number
|
|
See <a href="http://www.crockford.com/wrmg/base32.html">Base 32</a>.
|
|
> Ox.decodeBase32('foo')
|
|
15360
|
|
> Ox.decodeBase32('ILOU')
|
|
33819
|
|
> Ox.decodeBase32('?').toString()
|
|
'NaN'
|
|
@*/
|
|
Ox.decodeBase32 = function(string) {
|
|
return parseInt(Ox.map(string.toUpperCase(), function(char) {
|
|
var index = Ox.BASE_32_DIGITS.indexOf(
|
|
Ox.BASE_32_ALIASES[char] || char
|
|
);
|
|
return index == -1 ? ' ' : index.toString(32);
|
|
}), 32);
|
|
};
|
|
|
|
/*@
|
|
Ox.encodeBase64 <f> Encode a number as base64
|
|
> Ox.encodeBase64(32394)
|
|
'foo'
|
|
@*/
|
|
Ox.encodeBase64 = function(number) {
|
|
return btoa(Ox.encodeBase256(number)).replace(/=/g, '');
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeBase64 <f> Decodes a base64-encoded number
|
|
> Ox.decodeBase64('foo')
|
|
32394
|
|
@*/
|
|
Ox.decodeBase64 = function(string) {
|
|
return Ox.decodeBase256(atob(string));
|
|
};
|
|
|
|
/*@
|
|
Ox.encodeBase128 <f> Encode a number as base128
|
|
> Ox.encodeBase128(1685487)
|
|
'foo'
|
|
@*/
|
|
Ox.encodeBase128 = function(number) {
|
|
var string = '';
|
|
while (number) {
|
|
string = Ox.char(number & 127) + string;
|
|
number >>= 7;
|
|
}
|
|
return string;
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeBase128 <f> Decode a base128-encoded number
|
|
> Ox.decodeBase128('foo')
|
|
1685487
|
|
@*/
|
|
Ox.decodeBase128 = function(string) {
|
|
return string.split('').reverse().reduce(function(p, c, i) {
|
|
return p + (c.charCodeAt(0) << i * 7);
|
|
}, 0);
|
|
};
|
|
|
|
/*@
|
|
Ox.encodeBase256 <f> Encode a number as base256
|
|
> Ox.encodeBase256(6713199)
|
|
'foo'
|
|
@*/
|
|
Ox.encodeBase256 = function(number) {
|
|
var string = '';
|
|
while (number) {
|
|
string = Ox.char(number & 255) + string;
|
|
number >>= 8;
|
|
}
|
|
return string;
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeBase256 <f> Decode a base256-encoded number
|
|
> Ox.decodeBase256('foo')
|
|
6713199
|
|
@*/
|
|
Ox.decodeBase256 = function(string) {
|
|
return string.split('').reverse().reduce(function(p, c, i) {
|
|
return p + (c.charCodeAt(0) << i * 8);
|
|
}, 0);
|
|
};
|
|
|
|
/*@
|
|
Ox.encodeDeflate <f> Encodes a string, using deflate
|
|
Since PNGs are deflate-encoded, the `canvas` object's `toDataURL` method
|
|
provides an efficient implementation. The string is encoded as UTF-8 and
|
|
written to the RGB channels of a canvas element, then the PNG dataURL is
|
|
decoded from base64, and some head, tail and chunk names are removed.
|
|
(str) -> <s> The encoded string
|
|
str <s> The string to be encoded
|
|
> Ox.decodeDeflate(Ox.encodeDeflate('foo'), function(str) { Ox.test(str, 'foo'); })
|
|
undefined
|
|
@*/
|
|
Ox.encodeDeflate = function(string, callback) {
|
|
// Make sure we can encode the full unicode range of characters.
|
|
string = Ox.encodeUTF8(string);
|
|
// We can only safely write to RGB, so we need 1 pixel for 3 bytes.
|
|
// The string length may not be a multiple of 3, so we need to encode
|
|
// the number of padding bytes (1 byte), the string, and non-0-bytes
|
|
// as padding, so that the combined length becomes a multiple of 3.
|
|
var length = 1 + string.length, c = Ox.canvas(Math.ceil(length / 3), 1),
|
|
data, idat, pad = (3 - length % 3) % 3;
|
|
string = Ox.char(pad) + string + Ox.repeat('\u00FF', pad);
|
|
Ox.loop(c.data.length, function(i) {
|
|
// Write character codes into RGB, and 255 into ALPHA
|
|
c.data[i] = i % 4 < 3 ? string.charCodeAt(i - parseInt(i / 4)) : 255;
|
|
});
|
|
c.context.putImageData(c.imageData, 0, 0);
|
|
// Get the PNG data from the data URL and decode it from base64.
|
|
string = atob(c.canvas.toDataURL().split(',')[1]);
|
|
// Discard bytes 0 to 15 (8 bytes PNG signature, 4 bytes IHDR length, 4
|
|
// bytes IHDR name), keep bytes 16 to 19 (width), discard bytes 20 to 29
|
|
// (4 bytes height, 5 bytes flags), keep bytes 29 to 32 (IHDR checksum),
|
|
// keep the rest (IDAT chunks), discard the last 12 bytes (IEND chunk).
|
|
data = string.slice(16, 20) + string.slice(29, 33);
|
|
idat = string.slice(33, -12);
|
|
while (idat) {
|
|
// Each IDAT chunk is 4 bytes length, 4 bytes name, length bytes
|
|
// data and 4 bytes checksum. We can discard the name parts.
|
|
length = idat.slice(0, 4);
|
|
data += length + idat.slice(8, 12 + (
|
|
length = Ox.decodeBase256(length)
|
|
));
|
|
idat = idat.slice(12 + length);
|
|
}
|
|
// Allow for async use, symmetrical to Ox.decodeDeflate
|
|
callback && callback(data);
|
|
return data;
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeDeflate <f> Decodes an deflate-encoded string
|
|
Since PNGs are deflate-encoded, the `canvas` object's `drawImage` method
|
|
provides an efficient implementation. The string will be wrapped as a PNG
|
|
dataURL, encoded as base64, and drawn onto a canvas element, then the RGB
|
|
channels will be read, and the result will be decoded from UTF8.
|
|
(str) -> <u> undefined
|
|
str <s> The string to be decoded
|
|
callback <f> Callback function
|
|
str <s> The decoded string
|
|
@*/
|
|
|
|
Ox.decodeDeflate = function(string, callback) {
|
|
var image = new Image(),
|
|
// PNG file signature and IHDR chunk
|
|
data = '\u0089PNG\r\n\u001A\n\u0000\u0000\u0000\u000DIHDR'
|
|
+ string.slice(0, 4) + '\u0000\u0000\u0000\u0001'
|
|
+ '\u0008\u0006\u0000\u0000\u0000' + string.slice(4, 8),
|
|
// IDAT chunks
|
|
idat = string.slice(8), length;
|
|
function error() {
|
|
throw new RangeError('Deflate codec can\'t decode data.');
|
|
}
|
|
while (idat) {
|
|
// Reinsert the IDAT chunk names
|
|
length = idat.slice(0, 4);
|
|
data += length + 'IDAT' + idat.slice(4, 8 + (
|
|
length = Ox.decodeBase256(length)
|
|
));
|
|
idat = idat.slice(8 + length);
|
|
}
|
|
// IEND chunk
|
|
data += '\u0000\u0000\u0000\u0000IEND\u00AE\u0042\u0060\u0082';
|
|
// Unfortunately, we can't synchronously set the source of an image,
|
|
// draw it onto a canvas, and read its data.
|
|
image.onload = function() {
|
|
string = Ox.slice(Ox.canvas(image).data).map(function(value, index) {
|
|
// Read one character per RGB byte, ignore ALPHA.
|
|
return index % 4 < 3 ? Ox.char(value) : '';
|
|
}).join('');
|
|
try {
|
|
// Parse the first byte as number of bytes to chop at the end,
|
|
// and the rest, without these bytes, as an UTF8-encoded string.
|
|
string = Ox.decodeUTF8(
|
|
string.slice(1, -string.charCodeAt(0) || void 0)
|
|
);
|
|
} catch (e) {
|
|
error();
|
|
}
|
|
callback(string);
|
|
};
|
|
image.onerror = error;
|
|
image.src = 'data:image/png;base64,' + btoa(data);
|
|
};
|
|
|
|
(function() {
|
|
|
|
function replace(string) {
|
|
return string.toString().replace(/%(?![0-9A-Fa-f]{2})/g, '%25')
|
|
.replace(/(%[0-9A-Fa-f]{2})+/g, function(match) {
|
|
var hex = match.split('%').slice(1), ret;
|
|
Ox.forEach(Ox.range(1, hex.length + 1), function(length) {
|
|
var string = Ox.range(length).map(function(i) {
|
|
return Ox.char(parseInt(hex[i], 16));
|
|
}).join('');
|
|
try {
|
|
Ox.decodeUTF8(string);
|
|
ret = match.slice(0, length * 3)
|
|
+ replace(match.slice(length * 3));
|
|
return false;
|
|
} catch(e) {}
|
|
});
|
|
return ret || '%25' + hex[0] + replace(match.slice(3));
|
|
});
|
|
}
|
|
|
|
/*@
|
|
Ox.decodeURI <f> Decodes URI
|
|
Unlike window.decodeURI, this doesn't throw on trailing '%'.
|
|
(string) -> <s> Decoded string
|
|
@*/
|
|
Ox.decodeURI = function(string) {
|
|
return decodeURI(replace(string));
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeURIComponent <f> Decodes URI component
|
|
Unlike window.decodeURIComponent, this doesn't throw on trailing '%'.
|
|
(string) -> <s> Decoded string
|
|
@*/
|
|
Ox.decodeURIComponent = function(string) {
|
|
return decodeURIComponent(replace(string));
|
|
};
|
|
|
|
}());
|
|
|
|
/*@
|
|
Ox.encodeUTF8 <f> Encodes a string as UTF-8
|
|
see http://en.wikipedia.org/wiki/UTF-8
|
|
(string) -> <s> UTF-8 encoded string
|
|
string <s> Any string
|
|
> Ox.encodeUTF8("YES")
|
|
"YES"
|
|
> Ox.encodeUTF8("¥€$")
|
|
"\u00C2\u00A5\u00E2\u0082\u00AC\u0024"
|
|
@*/
|
|
Ox.encodeUTF8 = function(string) {
|
|
return Ox.map(string, function(char) {
|
|
var code = char.charCodeAt(0),
|
|
string = '';
|
|
if (code < 128) {
|
|
string = char;
|
|
} else if (code < 2048) {
|
|
string = String.fromCharCode(code >> 6 | 192)
|
|
+ String.fromCharCode(code & 63 | 128);
|
|
} else {
|
|
string = String.fromCharCode(code >> 12 | 224)
|
|
+ String.fromCharCode(code >> 6 & 63 | 128)
|
|
+ String.fromCharCode(code & 63 | 128);
|
|
}
|
|
return string;
|
|
});
|
|
};
|
|
|
|
/*@
|
|
Ox.decodeUTF8 <f> Decodes an UTF-8-encoded string
|
|
see http://en.wikipedia.org/wiki/UTF-8
|
|
(utf8) -> <s> string
|
|
utf8 <s> Any UTF-8-encoded string
|
|
> Ox.decodeUTF8('YES')
|
|
'YES'
|
|
> Ox.decodeUTF8('\u00C2\u00A5\u00E2\u0082\u00AC\u0024')
|
|
'¥€$'
|
|
@*/
|
|
Ox.decodeUTF8 = function(string) {
|
|
var code, i = 0, length = string.length, ret = '';
|
|
function error(byte, position) {
|
|
throw new RangeError(
|
|
'UTF-8 codec can\'t decode byte 0x' +
|
|
byte.toString(16).toUpperCase() + ' at position ' + position
|
|
);
|
|
}
|
|
while (i < length) {
|
|
code = [
|
|
string.charCodeAt(i),
|
|
string.charCodeAt(i + 1),
|
|
string.charCodeAt(i + 2)
|
|
];
|
|
if (code[0] < 128) {
|
|
ret += string[i];
|
|
i++;
|
|
} else if (
|
|
code[0] >= 192 && code[0] < 240
|
|
&& i < length - (code[0] < 224 ? 1 : 2)
|
|
) {
|
|
if (code[1] >= 128 && code[1] < 192) {
|
|
if (code[0] < 224) {
|
|
ret += String.fromCharCode(
|
|
(code[0] & 31) << 6 | code[1] & 63
|
|
);
|
|
i += 2;
|
|
} else if (code[2] >= 128 && code[2] < 192) {
|
|
ret += String.fromCharCode(
|
|
(code[0] & 15) << 12 | (code[1] & 63) << 6
|
|
| code[2] & 63
|
|
);
|
|
i += 3;
|
|
} else {
|
|
error(code[2], i + 2);
|
|
}
|
|
} else {
|
|
error(code[1], i + 1);
|
|
}
|
|
} else {
|
|
error(code[0], i);
|
|
}
|
|
}
|
|
return ret;
|
|
};
|