"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) { 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") { 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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