1

質問

PHPでエンコードされたJavaScriptで文字列をデコードし、「åäö」文字を維持するにはどうすればよいですか?

問題の概要

タイトルにあるように、PHPコードから生成したbase64でエンコードされた文字列をデコードしようとしています。スウェーデン語のアルファベットで終わる文字「åäö」を除いて、すべて正常に機能します。

出力例:

 å ä ö Å Ä Ö   =>   Ã¥ ä ö à à Ã

コード

私が使用しているbase64JavaScript

/*
 * Copyright (c) 2010 Nick Galbreath
 * http://code.google.com/p/stringencoders/source/browse/#svn/trunk/javascript
 *
 * 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.
*/

/* base64 encode/decode compatible with window.btoa/atob
 *
 * window.atob/btoa is a Firefox extension to convert binary data (the "b")
 * to base64 (ascii, the "a").
 *
 * It is also found in Safari and Chrome.  It is not available in IE.
 *
 * if (!window.btoa) window.btoa = base64.encode
 * if (!window.atob) window.atob = base64.decode
 *
 * The original spec's for atob/btoa are a bit lacking
 * https://developer.mozilla.org/en/DOM/window.atob
 * https://developer.mozilla.org/en/DOM/window.btoa
 *
 * window.btoa and base64.encode takes a string where charCodeAt is [0,255]
 * If any character is not [0,255], then an exception is thrown.
 *
 * window.atob and base64.decode take a base64-encoded string
 * If the input length is not a multiple of 4, or contains invalid characters
 *   then an exception is thrown.
 */
base64 = {};
base64.PADCHAR = '=';
base64.ALPHA = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
base64.getbyte64 = function(s,i) {
    // This is oddly fast, except on Chrome/V8.
    //  Minimal or no improvement in performance by using a
    //   object with properties mapping chars to value (eg. 'A': 0)
    var idx = base64.ALPHA.indexOf(s.charAt(i));
    if (idx == -1) {
    throw "Cannot decode base64";
    }
    return idx;
}

base64.decode = function(s) {
    // convert to string
    s = "" + s;
    var getbyte64 = base64.getbyte64;
    var pads, i, b10;
    var imax = s.length
    if (imax == 0) {
        return s;
    }

    if (imax % 4 != 0) {
    throw "Cannot decode base64";
    }

    pads = 0
    if (s.charAt(imax -1) == base64.PADCHAR) {
        pads = 1;
        if (s.charAt(imax -2) == base64.PADCHAR) {
            pads = 2;
        }
        // either way, we want to ignore this last block
        imax -= 4;
    }

    var x = [];
    for (i = 0; i < imax; i += 4) {
        b10 = (getbyte64(s,i) << 18) | (getbyte64(s,i+1) << 12) |
            (getbyte64(s,i+2) << 6) | getbyte64(s,i+3);
        x.push(String.fromCharCode(b10 >> 16, (b10 >> 8) & 0xff, b10 & 0xff));
    }

    switch (pads) {
    case 1:
        b10 = (getbyte64(s,i) << 18) | (getbyte64(s,i+1) << 12) | (getbyte64(s,i+2) << 6)
        x.push(String.fromCharCode(b10 >> 16, (b10 >> 8) & 0xff));
        break;
    case 2:
        b10 = (getbyte64(s,i) << 18) | (getbyte64(s,i+1) << 12);
        x.push(String.fromCharCode(b10 >> 16));
        break;
    }
    return x.join('');
}

base64.getbyte = function(s,i) {
    var x = s.charCodeAt(i);
    if (x > 255) {
        throw "INVALID_CHARACTER_ERR: DOM Exception 5";
    }
    return x;
}


base64.encode = function(s) {
    if (arguments.length != 1) {
    throw "SyntaxError: Not enough arguments";
    }
    var padchar = base64.PADCHAR;
    var alpha   = base64.ALPHA;
    var getbyte = base64.getbyte;

    var i, b10;
    var x = [];

    // convert to string
    s = "" + s;

    var imax = s.length - s.length % 3;

    if (s.length == 0) {
        return s;
    }
    for (i = 0; i < imax; i += 3) {
        b10 = (getbyte(s,i) << 16) | (getbyte(s,i+1) << 8) | getbyte(s,i+2);
        x.push(alpha.charAt(b10 >> 18));
        x.push(alpha.charAt((b10 >> 12) & 0x3F));
        x.push(alpha.charAt((b10 >> 6) & 0x3f));
        x.push(alpha.charAt(b10 & 0x3f));
    }
    switch (s.length - imax) {
    case 1:
        b10 = getbyte(s,i) << 16;
        x.push(alpha.charAt(b10 >> 18) + alpha.charAt((b10 >> 12) & 0x3F) +
               padchar + padchar);
        break;
    case 2:
        b10 = (getbyte(s,i) << 16) | (getbyte(s,i+1) << 8);
        x.push(alpha.charAt(b10 >> 18) + alpha.charAt((b10 >> 12) & 0x3F) +
               alpha.charAt((b10 >> 6) & 0x3f) + padchar);
        break;
    }
    return x.join('');
}

実装

<script type="text/javascript">
    document.write(
        base64.decode( '<?php echo base64_encode( "å ä ö Å Ä Ö" ); ?>' ) );
</script>

編集

私が見つけたスクリプトは機能しました:(
誰かが私にこれを求めたので、ここにあります)

var Base64 =
{
    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

    // public method for encoding
    encode : function (input)
    {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {

            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

        }

        return output;
    },

    // public method for decoding
    decode : function (input)
    {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        while (i < input.length) {

            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

        }

        output = Base64._utf8_decode(output);

        return output;

    },

    // private method for UTF-8 encoding
    _utf8_encode : function (string)
    {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode : function (utftext)
    {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        }

        return string;

    }
}
4

2 に答える 2

2

これを試して、問題が解決するかどうかを確認してください。

http://phpjs.org/

于 2012-04-28T23:13:46.053 に答える
2

文字エンコーディングの問題のようです。JavaScript ファイルであっても、すべてのファイルが同じエンコーディング (UTF-8?) を使用していることを確認してください。

他の人が同じ問題を経験していないかどうかを検索しようとしない場合は、それらの特殊文字で最も可能性が高い. (私はノルウェー出身なので、それらの気の毒なキャラクターがどのように扱われているかを知っています ;)

これで問題が解決しない場合は、別の JavaScript base64 デコーダーを試してください。

于 2012-04-28T23:06:52.060 に答える