53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
"use strict";
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var BOMChar = '\uFEFF';
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exports.PrependBOM = PrependBOMWrapper
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function PrependBOMWrapper(encoder, options) {
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this.encoder = encoder;
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this.addBOM = true;
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}
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PrependBOMWrapper.prototype.write = function(str) {
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if (this.addBOM) {
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str = BOMChar + str;
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this.addBOM = false;
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}
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return this.encoder.write(str);
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}
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PrependBOMWrapper.prototype.end = function() {
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return this.encoder.end();
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}
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//------------------------------------------------------------------------------
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exports.StripBOM = StripBOMWrapper;
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function StripBOMWrapper(decoder, options) {
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this.decoder = decoder;
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this.pass = false;
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this.options = options || {};
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}
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StripBOMWrapper.prototype.write = function(buf) {
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var res = this.decoder.write(buf);
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if (this.pass || !res)
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return res;
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if (res[0] === BOMChar) {
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res = res.slice(1);
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if (typeof this.options.stripBOM === 'function')
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this.options.stripBOM();
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}
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this.pass = true;
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return res;
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}
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StripBOMWrapper.prototype.end = function() {
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return this.decoder.end();
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}
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