iconv-js
Version:
Convert character encodings in pure javascript.
310 lines (203 loc) • 7.2 kB
JavaScript
if (typeof iconv_js != 'object') var iconv_js = {}
iconv_js = (function (iconv_js) { 'use strict'
//----------------------------------------------------------
//var log = console.log.bind(console)
var HAS_NODEJS_API = typeof module != 'undefined' && typeof Buffer != 'undefined'
var HAS_BOM_DOM_API = typeof window != 'undefined'
//ES6 APIs
Object.assign = Object.assign || function assign(target, source) {
Object.keys(source).forEach(function (key) {
target[key] = source[key]
})
}
ArrayBuffer.isView = ArrayBuffer.isView || function isView(x) {
return typeof x == 'object' && x.constructor.hasOwnProperty('BYTES_PER_ELEMENT')
}
//util
//init
var SJIS_UNI_TABLE_1, SJIS_UNI_TABLE_2, SJIS_UNI_TABLE_3, SJIS_UNI_TABLE_SP
function init() {
if (HAS_NODEJS_API) {
var SJIS_UNI_TABLE = require('./table/sjis-uni.js')
} else {
var SJIS_UNI_TABLE = iconv_js.SJIS_UNI_TABLE
}
SJIS_UNI_TABLE_1 = SJIS_UNI_TABLE[0]
SJIS_UNI_TABLE_2 = SJIS_UNI_TABLE[1]
SJIS_UNI_TABLE_3 = SJIS_UNI_TABLE[2]
SJIS_UNI_TABLE_SP = SJIS_UNI_TABLE[3]
var exports = {
fromSJIS: fromSJIS,
toSJIS: toSJIS,
}
if (HAS_NODEJS_API) {
module.exports = exports
} else {
Object.assign(iconv_js, exports)
}
return iconv_js
}
//main
if (HAS_NODEJS_API) {
init()
} else {
iconv_js.init = init
}
return iconv_js
//
function conv(x, func) {
if (typeof x === 'object') {
if (x instanceof ArrayBuffer) {
return func(x, false)
} else if (HAS_NODEJS_API && Buffer.isBuffer(x)) {
return func(x, true)
} else if (ArrayBuffer.isView(x)) {
return new x.constructor(func(x.buffer, false))
} else throw 'Unexpected Object Kind'
} else if (typeof x === 'string') {
throw 'Not Suported Yet'
} else throw 'Unexpected Type'
}
function fromSJIS(x) {
return conv(x, SJIStoUTF8)
}
function toSJIS(x) {
return conv(x, UTF8toSJIS)
}
function SJIStoUTF8(sjis_buf, UES_NODEJS_BUFFR) {
var uni_code = 0
if (UES_NODEJS_BUFFR) {
var sjis_len = sjis_buf.length
var sjisView = sjis_buf
var utf8_buf = new Buffer(sjis_len*3) // 要検討（2~6）
var utf8View = utf8_buf
} else {
var sjis_len = sjis_buf.byteLength
var sjisView = new Uint8Array(sjis_buf)
var utf8_buf = new ArrayBuffer(sjis_len*3) // 要検討（2~6）
var utf8View = new Uint8Array(utf8_buf)
}
var sjis_i = 0, utf8_i = 0
while (sjis_i < sjis_len) {
// sjis -> uni
var sjis_code = sjisView[sjis_i]
if (sjis_code === 0x7E) {
uni_code = 0x203E
} else if (sjis_code < 0x80) {
uni_code = sjis_code
} else if (sjis_code < 0xA0) {
if (sjis_i === sjis_len-1) break
uni_code = SJIS_UNI_TABLE_1[(sjisView[sjis_i]<<8|sjisView[++sjis_i]) - 0x8140]
} else if (sjis_code < 0xE0) {
uni_code = SJIS_UNI_TABLE_2[sjis_code - 0xA0]
} else {
if (sjis_i === sjis_len-1) break
uni_code = SJIS_UNI_TABLE_3[(sjisView[sjis_i]<<8|sjisView[++sjis_i]) - 0xE040]
}
++sjis_i
// uni -> utf8
if (uni_code < 0x80) {
utf8View[utf8_i++] = uni_code
} else if (uni_code < 0x800) {
utf8View[utf8_i++] = uni_code>>>6|0xC0
utf8View[utf8_i++] = uni_code&0x3F|0x80
} else if (uni_code < 0x10000) {
utf8View[utf8_i++] = uni_code>>>12|0xE0
utf8View[utf8_i++] = uni_code>>>6&0x3F|0x80
utf8View[utf8_i++] = uni_code&0x3F|0x80
} else if (uni_code < 0x200000) {
utf8View[utf8_i++] = uni_code>>>18|0xF0
utf8View[utf8_i++] = uni_code>>>12&0x3F|0x80
utf8View[utf8_i++] = uni_code>>>6&0x3F|0x80
utf8View[utf8_i++] = uni_code&0x3F|0x80
} else if (uni_code < 0x4000000) {
utf8View[utf8_i++] = uni_code>>>24|0xF8
utf8View[utf8_i++] = uni_code>>>18&0x3F|0x80
utf8View[utf8_i++] = uni_code>>>12&0x3F|0x80
utf8View[utf8_i++] = uni_code>>>6&0x3F|0x80
utf8View[utf8_i++] = uni_code&0x3F|0x80
} else {
utf8View[utf8_i++] = uni_code>>>30|0xFC
utf8View[utf8_i++] = uni_code>>>24&0x3F|0x80
utf8View[utf8_i++] = uni_code>>>18&0x3F|0x80
utf8View[utf8_i++] = uni_code>>>12&0x3F|0x80
utf8View[utf8_i++] = uni_code>>>6&0x3F|0x80
utf8View[utf8_i++] = uni_code&0x3F|0x80
}
}
return utf8_buf.slice(0, utf8_i)
}
function UTF8toSJIS(utf8_buf, UES_NODEJS_BUFFR) {
var uni_code = 0, sjis_code = 0
var index = 0
if (UES_NODEJS_BUFFR) {
var utf8_len = utf8_buf.length
var utf8View = utf8_buf
var sjis_buf = new Buffer(utf8_len*3) // 要検討（2~6）
var sjisView = sjis_buf
} else {
var utf8_len = utf8_buf.byteLength
var utf8View = new Uint8Array(utf8_buf)
var sjis_buf = new ArrayBuffer(utf8_len*3) // 要検討（2~6）
var sjisView = new Uint8Array(sjis_buf)
}
//function indexOf(table, code) { for (var i = 0; i < table.length; ++i) if (table[i] === code) return i; return -1 }
/*
function getBlockCode(n) {
var code = 0
for (var i = n-1; i >= 0; --i) {
code |= (utf8View[++utf8_i]&0x3F) << i*6
}
return code
}
*/
var utf8_i = 0, sjis_i = 0
while (utf8_i < utf8_len) {
// utf8 -> uni
var utf8_code = utf8View[utf8_i]
if ((utf8_code&0x80) === 0)
uni_code = utf8_code
else if((utf8_code&0xE0) === 0xC0)
uni_code = (utf8_code&0x1F)<<6 | (utf8View[++utf8_i]&0x3F)
else if((utf8_code&0xF0) === 0xE0)
uni_code = (utf8_code&0xF)<<12 | (utf8View[++utf8_i]&0x3F)<<6 | (utf8View[++utf8_i]&0x3F)
else if((utf8_code&0xF8) === 0xF0)
uni_code = (utf8_code&0x7)<<18 | (utf8View[++utf8_i]&0x3F)<<12 | (utf8View[++utf8_i]&0x3F)<<6 | (utf8View[++utf8_i]&0x3F)
else if((utf8_code&0xFC) === 0xF8)
uni_code = (utf8_code&0x3)<<24 | (utf8View[++utf8_i]&0x3F)<<18 | (utf8View[++utf8_i]&0x3F)<<12 | (utf8View[++utf8_i]&0x3F)<<6 | (utf8View[++utf8_i]&0x3F)
else if((utf8_code&0xFE) === 0xFC)
uni_code = (utf8_code&0x1)<<30 | (utf8View[++utf8_i]&0x3F)<<24 | (utf8View[++utf8_i]&0x3F)<<18 | (utf8View[++utf8_i]&0x3F)<<12 | (utf8View[++utf8_i]&0x3F)<<6 | (utf8View[++utf8_i]&0x3F)
else {++utf8_i; continue}
++utf8_i
// uni -> sjis
if (uni_code === 0x203E)
sjis_code = 0x7E
else if (uni_code < 0x80)
sjis_code = uni_code
else if ((index = SJIS_UNI_TABLE_2.indexOf(uni_code)) >= 0)
sjis_code = index + 0xA0
else if ((index = SJIS_UNI_TABLE_SP[uni_code]|0) > 0)
sjis_code = index
else if ((index = SJIS_UNI_TABLE_1.indexOf(uni_code)) >= 0)
sjis_code = index + 0x8140
else if ((index = SJIS_UNI_TABLE_3.indexOf(uni_code)) >= 0)
sjis_code = index + 0xE040
else {++utf8_i; continue}
if (sjis_code < 0x80) {
sjisView[sjis_i++] = sjis_code
} else if (sjis_code < 0xA0) {
sjisView[sjis_i++] = sjis_code>>>8
sjisView[sjis_i++] = sjis_code&0xFF
} else if (sjis_code < 0xE0) {
sjisView[sjis_i++] = sjis_code
} else {
sjisView[sjis_i++] = sjis_code>>>8
sjisView[sjis_i++] = sjis_code&0xFF
}
}
return sjis_buf.slice(0, sjis_i)
}
function KutenToSJIS(ku, ten) {
}
//----------------------------------------------------------
})(iconv_js);