102 lines
2.1 KiB
JavaScript
102 lines
2.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.decode = decode;
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function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
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function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }
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function con(b) {
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if ((b & 0xc0) === 0x80) {
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return b & 0x3f;
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} else {
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throw new Error("invalid UTF-8 encoding");
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}
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}
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function code(min, n) {
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if (n < min || 0xd800 <= n && n < 0xe000 || n >= 0x10000) {
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throw new Error("invalid UTF-8 encoding");
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} else {
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return n;
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}
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}
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function decode(bytes) {
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return _decode(bytes).map(function (x) {
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return String.fromCharCode(x);
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}).join("");
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}
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function _decode(bytes) {
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if (bytes.length === 0) {
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return [];
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}
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/**
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* 1 byte
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*/
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{
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var _bytes = _toArray(bytes),
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b1 = _bytes[0],
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bs = _bytes.slice(1);
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if (b1 < 0x80) {
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return [code(0x0, b1)].concat(_toConsumableArray(_decode(bs)));
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}
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if (b1 < 0xc0) {
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throw new Error("invalid UTF-8 encoding");
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}
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}
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/**
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* 2 bytes
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*/
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{
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var _bytes2 = _toArray(bytes),
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_b = _bytes2[0],
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b2 = _bytes2[1],
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_bs = _bytes2.slice(2);
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if (_b < 0xe0) {
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return [code(0x80, ((_b & 0x1f) << 6) + con(b2))].concat(_toConsumableArray(_decode(_bs)));
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}
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}
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/**
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* 3 bytes
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*/
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{
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var _bytes3 = _toArray(bytes),
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_b2 = _bytes3[0],
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_b3 = _bytes3[1],
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b3 = _bytes3[2],
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_bs2 = _bytes3.slice(3);
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if (_b2 < 0xf0) {
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return [code(0x800, ((_b2 & 0x0f) << 12) + (con(_b3) << 6) + con(b3))].concat(_toConsumableArray(_decode(_bs2)));
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}
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}
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/**
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* 4 bytes
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*/
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{
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var _bytes4 = _toArray(bytes),
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_b4 = _bytes4[0],
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_b5 = _bytes4[1],
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_b6 = _bytes4[2],
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b4 = _bytes4[3],
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_bs3 = _bytes4.slice(4);
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if (_b4 < 0xf8) {
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return [code(0x10000, (((_b4 & 0x07) << 18) + con(_b5) << 12) + (con(_b6) << 6) + con(b4))].concat(_toConsumableArray(_decode(_bs3)));
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}
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}
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throw new Error("invalid UTF-8 encoding");
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}
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