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鸽子
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873天前<?PHP |
//encode64编码可以同时取代encodeURI,encodeURIComponent,endode函数, 因为选取的这些字符都不会被编码. |
class Encode64{ |
function code($str) { |
$KEY = 'PaAwO65goUf7IK2vi9-xq8cFTEXLCDY1Hd3tV0ryzjbpN_BlnSs4mGRkQWMZJeuh'; |
$a = StrToBytes($str); |
$len = count($a); |
$res = $len % 3; |
$s = "";$i = 2;$v = 0; |
for (; $i < $len; $i += 3) { |
$v = $a[$i - 2] + ($a[$i - 1] << 8) + ($a[$i] << 16); |
$s .= $KEY[$v & 0x3f]; |
$s .= $KEY[($v >> 6) & 0x3f]; |
$s .= $KEY[($v >> 12) & 0x3f]; |
$s .= $KEY[($v >> 18)]; |
} |
if ($res == 1) { |
$v = $a[$i - 2]; |
$s .= $KEY[$v & 0x3f]; |
$s .= $KEY[($v >> 6) & 0x3f]; |
} else if ($res == 2) { |
$v = $a[$i - 2] + ($a[$i - 1] << 8); |
$s .= $KEY[$v & 0x3f]; |
$s .= $KEY[($v >> 6) & 0x3f]; |
$s .= $KEY[($v >> 12) & 0x3f]; |
} |
return $s; |
} |
function decode($codeStr) { |
$KEY = 'PaAwO65goUf7IK2vi9-xq8cFTEXLCDY1Hd3tV0ryzjbpN_BlnSs4mGRkQWMZJeuh'; |
$dic = array(); |
for ($i = 0; $i < 64; $i++) { |
$dic[$KEY[$i]] = $i; |
} |
$len = strlen($codeStr); |
$res = $len % 4; |
$cLen = floor($len/4)*3; |
if($res==2) $clen += 1; |
elseif($res==3) $clen += 2; |
$code = range(0,$clen); |
$i = 3;$v = 0; $j = 0; |
for (; $i < $len; $i += 4) { |
$v = $dic[$codeStr[$i - 3]]; |
$v += $dic[$codeStr[$i - 2]] << 6; |
$v += $dic[$codeStr[$i - 1]] << 12; |
$v += $dic[$codeStr[$i]] << 18; |
$code[$j] = $v & 0xff; |
$code[$j+1] = ($v >> 8) & 0xff; |
$code[$j+2] = ($v >> 16) & 0xff; |
$j += 3; |
} |
if ($res == 2) {//正确的字节数肯定是余2或3, 没有1的情况, 如果出现, 舍弃. |
$v = $dic[$codeStr[$i - 3]]; |
$v += $dic[$codeStr[$i - 2]] << 6; |
$code[$j] = $v & 0xff; |
} else if ($res == 3) { |
$v = $dic[$codeStr[$i - 3]]; |
$v += $dic[$codeStr[$i - 2]] << 6; |
$v += $dic[$codeStr[$i - 1]] << 12; |
$code[$j] = $v & 0xff; |
$code[$j+1] = ($v >> 8) & 0xff; |
} |
return BytesToStr($code); |
} |
} |
function BytesToStr($bytes) { |
$str = ''; |
foreach($bytes as $ch) { |
$str .= chr($ch); |
} |
return iconv('UTF-16BE','utf-8',$str); |
} |
function StrToBytes($str) { |
$str = iconv('utf-8','UTF-16BE',$str); |
$len = strlen($str); |
$bytes = array(); |
for($i=0;$i<$len;$i++) { |
$bytes[] = ord($str[$i]) ; |
} |
return $bytes; |
} |
?> |
