<?php

/*

Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

*/

// ************************

// *** Helper Functions ***

// ************************

// Base64 character set:

// [A-Z] [a-z] [0-9] + /

// 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f

function base64Decode6Bits($src)

{

$ret = -1;

// if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64

$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);

// if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70

$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);

// if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5

$ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);

// if ($src == 0x2b) $ret += 62 + 1;

$ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63;

// if ($src == 0x2f) ret += 63 + 1;

$ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64;

return $ret;

}

function base64Encode6Bits($src)

{

$diff = 0x41;

// if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6

$diff += ((25 - $src) >> 8) & 6;

// if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75

$diff -= ((51 - $src) >> 8) & 75;

// if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15

$diff -= ((61 - $src) >> 8) & 15;

// if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3

$diff += ((62 - $src) >> 8) & 3;

return chr($src + $diff);

}

// Base64 character set:

// ./ [A-Z] [a-z] [0-9]

// 0x2e-0x2f, 0x41-0x5a, 0x61-0x7a, 0x30-0x39

function base64Decode6BitsDotSlash($src)

{

$ret = -1;

// if ($src > 0x2d && $src < 0x30) ret += $src - 0x2e + 1; // -45

$ret += (((0x2d - $src) & ($src - 0x30)) >> 8) & ($src - 45);

// if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 2 + 1; // -62

$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 62);

// if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 28 + 1; // -68

$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 68);

// if ($src > 0x2f && $src < 0x3a) ret += $src - 0x30 + 54 + 1; // 7

$ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 7);

return $ret;

}

function base64Encode6BitsDotSlash($src)

{

$src += 0x2e;

// if ($src > 0x2f) $src += 0x41 - 0x30; // 17

$src += ((0x2f - $src) >> 8) & 17;

// if ($src > 0x5a) $src += 0x61 - 0x5b; // 6

$src += ((0x5a - $src) >> 8) & 6;

// if ($src > 0x7a) $src += 0x30 - 0x7b; // -75

$src -= ((0x7a - $src) >> 8) & 75;

return chr($src);

}

// Base64 character set:

// [.-9] [A-Z] [a-z]

// 0x2e-0x39, 0x41-0x5a, 0x61-0x7a

function base64Decode6BitsDotSlashOrdered($src)

{

$ret = -1;

// if ($src > 0x2d && $src < 0x3a) ret += $src - 0x2e + 1; // -45

$ret += (((0x2d - $src) & ($src - 0x3a)) >> 8) & ($src - 45);

// if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 12 + 1; // -52

$ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 52);

// if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 38 + 1; // -58

$ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 58);

return $ret;

}

function base64Encode6BitsDotSlashOrdered($src)

{

$src += 0x2e;

// if ($src > 0x39) $src += 0x41 - 0x3a; // 7

$src += ((0x39 - $src) >> 8) & 7;

// if ($src > 0x5a) $src += 0x61 - 0x5b; // 6

$src += ((0x5a - $src) >> 8) & 6;

return chr($src);

}

// **********************

// *** Main Functions ***

// **********************

// Base64 character set "[A-Z][a-z][0-9]+/"

function base64Encode($src)

{

$dest = '';

$srcLen = strlen($src);

for ($i = 0; $i + 3 <= $srcLen; $i += 3)

{

$b0 = ord($src[$i]);

$b1 = ord($src[$i + 1]);

$b2 = ord($src[$i + 2]);

$dest .=

base64Encode6Bits( $b0 >> 2 ) .

base64Encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .

base64Encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .

base64Encode6Bits( $b2 & 63);

}

if ($i < $srcLen)

{

$b0 = ord($src[$i]);

if ($i + 1 < $srcLen)

{

$b1 = ord($src[$i + 1]);

$dest .=

base64Encode6Bits( $b0 >> 2 ) .

base64Encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .

base64Encode6Bits( ($b1 << 2) & 63) . '=';

}

else

{

$dest .=

base64Encode6Bits( $b0 >> 2) .

base64Encode6Bits(($b0 << 4) & 63) . '==';

}

}

return $dest;

}

function base64Decode($src)

{

// Remove padding

$srcLen = strlen($src);

if ($srcLen == 0)

{

return '';

}

if (($srcLen & 3) == 0)

{

if ($src[$srcLen - 1] == '=')

{

$srcLen--;

if ($src[$srcLen - 1] == '=')

{

$srcLen--;

}

}

}

if (($srcLen & 3) == 1)

{

return false;

}

$err = 0;

$dest = '';

for ($i = 0; $i + 4 <= $srcLen; $i += 4)

{

$c0 = base64Decode6Bits(ord($src[$i]));

$c1 = base64Decode6Bits(ord($src[$i + 1]));

$c2 = base64Decode6Bits(ord($src[$i + 2]));

$c3 = base64Decode6Bits(ord($src[$i + 3]));

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr((($c1 << 4) | ($c2 >> 2)) & 0xff) .

chr((($c2 << 6) | $c3 ) & 0xff);

$err |= ($c0 | $c1 | $c2 | $c3) >> 8;

}

if ($i < $srcLen)

{

$c0 = base64Decode6Bits(ord($src[$i]));

$c1 = base64Decode6Bits(ord($src[$i + 1]));

if ($i + 2 < $srcLen)

{

$c2 = base64Decode6Bits(ord($src[$i + 2]));

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr((($c1 << 4) | ($c2 >> 2)) & 0xff) .

chr( ($c2 << 6) & 0xff);

$err |= ($c0 | $c1 | $c2) >> 8;

}

else

{

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr( ($c1 << 4) & 0xff);

$err |= ($c0 | $c1) >> 8;

}

}

if ($err != 0)

{

return false;

}

return $dest;

}

// Base64 character set "./[A-Z][a-z][0-9]"

function base64EncodeDotSlash($src)

{

$dest = '';

$srcLen = strlen($src);

for ($i = 0; $i + 3 <= $srcLen; $i += 3)

{

$b0 = ord($src[$i]);

$b1 = ord($src[$i + 1]);

$b2 = ord($src[$i + 2]);

$dest .=

base64Encode6BitsDotSlash( $b0 >> 2 ) .

base64Encode6BitsDotSlash((($b0 << 4) | ($b1 >> 4)) & 63) .

base64Encode6BitsDotSlash((($b1 << 2) | ($b2 >> 6)) & 63) .

base64Encode6BitsDotSlash( $b2 & 63);

}

if ($i < $srcLen)

{

$b0 = ord($src[$i]);

if ($i + 1 < $srcLen)

{

$b1 = ord($src[$i + 1]);

$dest .=

base64Encode6BitsDotSlash( $b0 >> 2 ) .

base64Encode6BitsDotSlash((($b0 << 4) | ($b1 >> 4)) & 63) .

base64Encode6BitsDotSlash( ($b1 << 2) & 63) . '=';

}

else

{

$dest .=

base64Encode6BitsDotSlash( $b0 >> 2) .

base64Encode6BitsDotSlash(($b0 << 4) & 63) . '==';

}

}

return $dest;

}

function base64DecodeDotSlash($src)

{

// Remove padding

$srcLen = strlen($src);

if ($srcLen == 0)

{

return '';

}

if (($srcLen & 3) == 0)

{

if ($src[$srcLen - 1] == '=')

{

$srcLen--;

if ($src[$srcLen - 1] == '=')

{

$srcLen--;

}

}

}

if (($srcLen & 3) == 1)

{

return false;

}

$err = 0;

$dest = '';

for ($i = 0; $i + 4 <= $srcLen; $i += 4)

{

$c0 = base64Decode6BitsDotSlash(ord($src[$i]));

$c1 = base64Decode6BitsDotSlash(ord($src[$i + 1]));

$c2 = base64Decode6BitsDotSlash(ord($src[$i + 2]));

$c3 = base64Decode6BitsDotSlash(ord($src[$i + 3]));

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr((($c1 << 4) | ($c2 >> 2)) & 0xff) .

chr((($c2 << 6) | $c3 ) & 0xff);

$err |= ($c0 | $c1 | $c2 | $c3) >> 8;

}

if ($i < $srcLen)

{

$c0 = base64Decode6BitsDotSlash(ord($src[$i]));

$c1 = base64Decode6BitsDotSlash(ord($src[$i + 1]));

if ($i + 2 < $srcLen)

{

$c2 = base64Decode6BitsDotSlash(ord($src[$i + 2]));

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr((($c1 << 4) | ($c2 >> 2)) & 0xff) .

chr( ($c2 << 6) & 0xff);

$err |= ($c0 | $c1 | $c2) >> 8;

}

else

{

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr( ($c1 << 4) & 0xff);

$err |= ($c0 | $c1) >> 8;

}

}

if ($err != 0)

{

return false;

}

return $dest;

}

// Base64 character set "[.-9][A-Z][a-z]" or "./[0-9][A-Z][a-z]"

function base64EncodeDotSlashOrdered($src)

{

$dest = '';

$srcLen = strlen($src);

for ($i = 0; $i + 3 <= $srcLen; $i += 3)

{

$b0 = ord($src[$i]);

$b1 = ord($src[$i + 1]);

$b2 = ord($src[$i + 2]);

$dest .=

base64Encode6BitsDotSlashOrdered( $b0 >> 2 ) .

base64Encode6BitsDotSlashOrdered((($b0 << 4) | ($b1 >> 4)) & 63) .

base64Encode6BitsDotSlashOrdered((($b1 << 2) | ($b2 >> 6)) & 63) .

base64Encode6BitsDotSlashOrdered( $b2 & 63);

}

if ($i < $srcLen)

{

$b0 = ord($src[$i]);

if ($i + 1 < $srcLen)

{

$b1 = ord($src[$i + 1]);

$dest .=

base64Encode6BitsDotSlashOrdered( $b0 >> 2 ) .

base64Encode6BitsDotSlashOrdered((($b0 << 4) | ($b1 >> 4)) & 63) .

base64Encode6BitsDotSlashOrdered( ($b1 << 2) & 63) . '=';

}

else

{

$dest .=

base64Encode6BitsDotSlashOrdered( $b0 >> 2) .

base64Encode6BitsDotSlashOrdered(($b0 << 4) & 63) . '==';

}

}

return $dest;

}

function base64DecodeDotSlashOrdered($src)

{

// Remove padding

$srcLen = strlen($src);

if ($srcLen == 0)

{

return '';

}

if (($srcLen & 3) == 0)

{

if ($src[$srcLen - 1] == '=')

{

$srcLen--;

if ($src[$srcLen - 1] == '=')

{

$srcLen--;

}

}

}

if (($srcLen & 3) == 1)

{

return false;

}

$err = 0;

$dest = '';

for ($i = 0; $i + 4 <= $srcLen; $i += 4)

{

$c0 = base64Decode6BitsDotSlashOrdered(ord($src[$i]));

$c1 = base64Decode6BitsDotSlashOrdered(ord($src[$i + 1]));

$c2 = base64Decode6BitsDotSlashOrdered(ord($src[$i + 2]));

$c3 = base64Decode6BitsDotSlashOrdered(ord($src[$i + 3]));

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr((($c1 << 4) | ($c2 >> 2)) & 0xff) .

chr((($c2 << 6) | $c3 ) & 0xff);

$err |= ($c0 | $c1 | $c2 | $c3) >> 8;

}

if ($i < $srcLen)

{

$c0 = base64Decode6BitsDotSlashOrdered(ord($src[$i]));

$c1 = base64Decode6BitsDotSlashOrdered(ord($src[$i + 1]));

if ($i + 2 < $srcLen)

{

$c2 = base64Decode6BitsDotSlashOrdered(ord($src[$i + 2]));

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr((($c1 << 4) | ($c2 >> 2)) & 0xff) .

chr( ($c2 << 6) & 0xff);

$err |= ($c0 | $c1 | $c2) >> 8;

}

else

{

$dest .=

chr((($c0 << 2) | ($c1 >> 4)) & 0xff) .

chr( ($c1 << 4) & 0xff);

$err |= ($c0 | $c1) >> 8;

}

}

if ($err != 0)

{

return false;

}

return $dest;

}