52 lines
1,008 B
JavaScript
52 lines
1,008 B
JavaScript
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'use strict';
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var through = require('through2');
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var removeBom = require('remove-bom-buffer');
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var SafeBuffer = require('safe-buffer').Buffer;
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function removeBomStream() {
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var completed = false;
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var buffer = SafeBuffer.alloc(0);
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return through(onChunk, onFlush);
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function removeAndCleanup(data) {
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completed = true;
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buffer = null;
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return removeBom(data);
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}
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function onChunk(data, enc, cb) {
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if (completed) {
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return cb(null, data);
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}
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if (data.length >= 7) {
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return cb(null, removeAndCleanup(data));
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}
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var bufferLength = buffer.length;
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var chunkLength = data.length;
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var totalLength = bufferLength + chunkLength;
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buffer = SafeBuffer.concat([buffer, data], totalLength);
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if (totalLength >= 7) {
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return cb(null, removeAndCleanup(buffer));
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}
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cb();
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}
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function onFlush(cb) {
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if (completed || !buffer) {
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return cb();
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}
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cb(null, removeAndCleanup(buffer));
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}
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}
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module.exports = removeBomStream;
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