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<?php
function n2CharCodeAt($data, $char) {
return ord(substr($data, $char, 1));
}
function n2CharAt($data, $char) {
return substr($data, $char, 1);
}
if (function_exists('base64_decode')) {
function n2_base64_decode($data) {
return base64_decode($data);
}
} else {
function n2_base64_decode($input) {
$keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
$chr1 = $chr2 = $chr3 = "";
$enc1 = $enc2 = $enc3 = $enc4 = "";
$i = 0;
$output = "";
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
$filter = $input;
$input = preg_replace("[^A-Za-z0-9\+\/\=]", "", $input);
if ($filter != $input) {
return false;
}
do {
$enc1 = strpos($keyStr, substr($input, $i++, 1));
$enc2 = strpos($keyStr, substr($input, $i++, 1));
$enc3 = strpos($keyStr, substr($input, $i++, 1));
$enc4 = strpos($keyStr, substr($input, $i++, 1));
$chr1 = ($enc1 << 2) | ($enc2 >> 4);
$chr2 = (($enc2 & 15) << 4) | ($enc3 >> 2);
$chr3 = (($enc3 & 3) << 6) | $enc4;
$output = $output . chr((int)$chr1);
if ($enc3 != 64) {
$output = $output . chr((int)$chr2);
}
if ($enc4 != 64) {
$output = $output . chr((int)$chr3);
}
$chr1 = $chr2 = $chr3 = "";
$enc1 = $enc2 = $enc3 = $enc4 = "";
} while ($i < strlen($input));
return urldecode($output);
}
}
if (function_exists('base64_encode')) {
function n2_base64_encode($data) {
return base64_encode($data);
}
} else {
function n2_base64_encode($data) {
$b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
$o1 = $o2 = $o3 = $h1 = $h2 = $h3 = $h4 = $bits = $i = 0;
$ac = 0;
$enc = '';
$tmp_arr = array();
if (!$data) {
return data;
}
do {
// pack three octets into four hexets
$o1 = n2CharCodeAt($data, $i++);
$o2 = n2CharCodeAt($data, $i++);
$o3 = n2CharCodeAt($data, $i++);
$bits = $o1 << 16 | $o2 << 8 | $o3;
$h1 = $bits >> 18 & 0x3f;
$h2 = $bits >> 12 & 0x3f;
$h3 = $bits >> 6 & 0x3f;
$h4 = $bits & 0x3f;
// use hexets to index into b64, and append result to encoded string
$tmp_arr[$ac++] = n2CharAt($b64, $h1) . n2CharAt($b64, $h2) . n2CharAt($b64, $h3) . n2CharAt($b64, $h4);
} while ($i < strlen($data));
$enc = implode($tmp_arr, '');
$r = (strlen($data) % 3);
return ($r ? substr($enc, 0, ($r - 3)) . substr('===', $r) : $enc);
}
}
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