1 | "use strict";
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2 |
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3 | var BOMChar = '\uFEFF';
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4 |
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5 | exports.PrependBOM = PrependBOMWrapper
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6 | function PrependBOMWrapper(encoder, options) {
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7 | this.encoder = encoder;
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8 | this.addBOM = true;
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9 | }
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10 |
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11 | PrependBOMWrapper.prototype.write = function(str) {
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12 | if (this.addBOM) {
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13 | str = BOMChar + str;
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14 | this.addBOM = false;
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15 | }
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16 |
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17 | return this.encoder.write(str);
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18 | }
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19 |
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20 | PrependBOMWrapper.prototype.end = function() {
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21 | return this.encoder.end();
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22 | }
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23 |
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24 |
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25 |
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26 |
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27 | exports.StripBOM = StripBOMWrapper;
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28 | function StripBOMWrapper(decoder, options) {
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29 | this.decoder = decoder;
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30 | this.pass = false;
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31 | this.options = options || {};
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32 | }
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33 |
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34 | StripBOMWrapper.prototype.write = function(buf) {
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35 | var res = this.decoder.write(buf);
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36 | if (this.pass || !res)
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37 | return res;
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38 |
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39 | if (res[0] === BOMChar) {
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40 | res = res.slice(1);
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41 | if (typeof this.options.stripBOM === 'function')
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42 | this.options.stripBOM();
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43 | }
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44 |
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45 | this.pass = true;
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46 | return res;
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47 | }
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48 |
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49 | StripBOMWrapper.prototype.end = function() {
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50 | return this.decoder.end();
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51 | }
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52 |
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