jquery.base64.js的修正

http://my.oschina.net/aruan/blog/418980
深圳一朋友说使用jquery.base64.js时发现对于中文直接抛出异常，作者压根不处理汉字的情况，因此

对其进行修正，关键函数为：

Js代码

function _decode_chars(y, x){

while(y.length > 0){

var ch = y[0];

if(ch < 0x80) {

y.shift();

x.push(String.fromCharCode(ch));

}else if((ch & 0x80) == 0xc0){

if(y.length < 2) break;

ch = y.shift();

var ch1 = y.shift();

x.push(String.fromCharCode( ((ch & 0x1f) << 6) + (ch1 & 0x3f)));

}else{

if(y.length < 3) break;

ch = y.shift();

var ch1 = y.shift();

var ch2 = y.shift();

x.push(String.fromCharCode(((ch & 0x0f) << 12) + ((ch1 & 0x3f) << 6) + (ch2 & 0x3f)));

}

function _get_chars(ch, y){

if(ch < 0x80) y.push(ch);

else if(ch < 0x800){

y.push(0xc0 + ((ch >> 6) & 0x1f));

y.push(0x80 + (ch & 0x3f));

}else{

y.push(0xe0 + ((ch >> 12) & 0xf));

y.push(0x80 + ((ch >> 6) & 0x3f));

y.push(0x80 + (ch & 0x3f));

}

完整代码

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Js代码

jQuery.base64 = ( function( $ ) {

var _PADCHAR = "=",

_ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",

_VERSION = "1.1";//Mr. Ruan fix to 1.1 to support asian char(utf8)

function _getbyte64( 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 = _ALPHA.indexOf( s.charAt( i ) );

if ( idx === -1 ) {

throw "Cannot decode base64";

}

return idx;

}

function _decode_chars(y, x){

while(y.length > 0){

var ch = y[0];

if(ch < 0x80) {

y.shift();

x.push(String.fromCharCode(ch));

}else if((ch & 0x80) == 0xc0){

if(y.length < 2) break;

ch = y.shift();

var ch1 = y.shift();

x.push(String.fromCharCode( ((ch & 0x1f) << 6) + (ch1 & 0x3f)));

}else{

if(y.length < 3) break;

ch = y.shift();

var ch1 = y.shift();

var ch2 = y.shift();

x.push(String.fromCharCode(((ch & 0x0f) << 12) + ((ch1 & 0x3f) << 6) + (ch2 & 0x3f)));

}

function _decode( s ) {

var pads = 0,

b10,

imax = s.length,

x = [],

y = [];

s = String( s );

if ( imax === 0 ) {

return s;

}

if ( imax % 4 !== 0 ) {

throw "Cannot decode base64";

}

if ( s.charAt( imax - 1 ) === _PADCHAR ) {

pads = 1;

if ( s.charAt( imax - 2 ) === _PADCHAR ) {

pads = 2;

}

// either way, we want to ignore this last block

imax -= 4;

}

for ( i = 0; i < imax; i += 4 ) {

var ch1 = _getbyte64( s, i );

var ch2 = _getbyte64( s, i + 1);

var ch3 = _getbyte64( s, i + 2);

var ch4 = _getbyte64( s, i + 3);

b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 ) | _getbyte64( s, i + 3 );

y.push(b10 >> 16);

y.push((b10 >> 8) & 0xff);

y.push(b10 & 0xff);

_decode_chars(y, x);

}

switch ( pads ) {

case 1:

b10 = ( _getbyte64( s, i ) << 18 ) | ( _getbyte64( s, i + 1 ) << 12 ) | ( _getbyte64( s, i + 2 ) << 6 );

y.push(b10 >> 16);

y.push((b10 >> 8) & 0xff);

break;

case 2:

b10 = ( _getbyte64( s, i ) << 18) | ( _getbyte64( s, i + 1 ) << 12 );

y.push(b10 >> 16);

break;

}

_decode_chars(y, x);

if(y.length > 0) throw "Cannot decode base64";

return x.join( "" );

}

function _get_chars(ch, y){

if(ch < 0x80) y.push(ch);

else if(ch < 0x800){

y.push(0xc0 + ((ch >> 6) & 0x1f));

y.push(0x80 + (ch & 0x3f));

}else{

y.push(0xe0 + ((ch >> 12) & 0xf));

y.push(0x80 + ((ch >> 6) & 0x3f));

y.push(0x80 + (ch & 0x3f));

}

function _encode( s ) {

if ( arguments.length !== 1 ) {

throw "SyntaxError: exactly one argument required";

}

s = String( s );

if ( s.length === 0 ) {

return s;

}

//s = _encode_utf8(s);

var i,

b10,

y = [],

x = [],

len = s.length;

i = 0;

while(i < len){

_get_chars(s.charCodeAt(i), y);

while(y.length >= 3){

var ch1 = y.shift();

var ch2 = y.shift();

var ch3 = y.shift();

b10 = ( ch1 << 16 ) | ( ch2 << 8 ) | ch3;

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 ) );

}

i++;

}

switch ( y.length ) {

case 1:

var ch = y.shift();

b10 = ch << 16;

x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _PADCHAR + _PADCHAR );

break;

case 2:

var ch1 = y.shift();

var ch2 = y.shift();

b10 = ( ch1 << 16 ) | ( ch2 << 8 );

x.push( _ALPHA.charAt( b10 >> 18 ) + _ALPHA.charAt( ( b10 >> 12 ) & 0x3F ) + _ALPHA.charAt( ( b10 >> 6 ) & 0x3f ) + _PADCHAR );

break;

}

return x.join( "" );

}

return {

decode: _decode,

encode: _encode,

VERSION: _VERSION

};

}( jQuery ) );

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jquery.base64.js的修正

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jquery.base64.js的修正

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