138 lines
4.1 KiB
JavaScript
138 lines
4.1 KiB
JavaScript
/*
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* Copyright © 2016-2017 The Thingsboard Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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export function utf8Encode(str) {
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var result;
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if (angular.isUndefined(Uint8Array)) { // eslint-disable-line no-undef
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result = utf8ToBytes(str);
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} else {
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result = new Uint8Array(utf8ToBytes(str)); // eslint-disable-line no-undef
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}
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return result;
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}
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export function utf8Decode(bytes) {
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return utf8Slice(bytes, 0, bytes.length);
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}
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function utf8Slice (buf, start, end) {
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var res = ''
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var tmp = ''
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end = Math.min(buf.length, end || Infinity)
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start = start || 0;
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for (var i = start; i < end; i++) {
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if (buf[i] <= 0x7F) {
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res += decodeUtf8Char(tmp) + String.fromCharCode(buf[i])
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tmp = ''
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} else {
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tmp += '%' + buf[i].toString(16)
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}
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}
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return res + decodeUtf8Char(tmp)
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}
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function decodeUtf8Char (str) {
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try {
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return decodeURIComponent(str)
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} catch (err) {
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return String.fromCharCode(0xFFFD) // UTF 8 invalid char
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}
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}
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function utf8ToBytes (string, units) {
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units = units || Infinity
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var codePoint
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var length = string.length
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var leadSurrogate = null
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var bytes = []
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var i = 0
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for (; i < length; i++) {
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codePoint = string.charCodeAt(i)
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// is surrogate component
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if (codePoint > 0xD7FF && codePoint < 0xE000) {
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// last char was a lead
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if (leadSurrogate) {
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// 2 leads in a row
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if (codePoint < 0xDC00) {
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if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
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leadSurrogate = codePoint
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continue
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} else {
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// valid surrogate pair
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codePoint = leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00 | 0x10000
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leadSurrogate = null
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}
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} else {
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// no lead yet
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if (codePoint > 0xDBFF) {
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// unexpected trail
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if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
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continue
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} else if (i + 1 === length) {
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// unpaired lead
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if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
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continue
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} else {
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// valid lead
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leadSurrogate = codePoint
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continue
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}
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}
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} else if (leadSurrogate) {
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// valid bmp char, but last char was a lead
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if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
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leadSurrogate = null
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}
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// encode utf8
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if (codePoint < 0x80) {
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if ((units -= 1) < 0) break
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bytes.push(codePoint)
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} else if (codePoint < 0x800) {
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if ((units -= 2) < 0) break
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bytes.push(
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codePoint >> 0x6 | 0xC0,
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codePoint & 0x3F | 0x80
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)
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} else if (codePoint < 0x10000) {
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if ((units -= 3) < 0) break
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bytes.push(
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codePoint >> 0xC | 0xE0,
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codePoint >> 0x6 & 0x3F | 0x80,
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codePoint & 0x3F | 0x80
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)
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} else if (codePoint < 0x200000) {
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if ((units -= 4) < 0) break
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bytes.push(
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codePoint >> 0x12 | 0xF0,
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codePoint >> 0xC & 0x3F | 0x80,
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codePoint >> 0x6 & 0x3F | 0x80,
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codePoint & 0x3F | 0x80
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)
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} else {
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throw new Error('Invalid code point')
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}
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}
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return bytes
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} |