ZlibHeaderTransformStream.js•681 B
"use strict";
import stream from "stream";
class ZlibHeaderTransformStream extends stream.Transform {
__transform(chunk, encoding, callback) {
this.push(chunk);
callback();
}
_transform(chunk, encoding, callback) {
if (chunk.length !== 0) {
this._transform = this.__transform;
// Add Default Compression headers if no zlib headers are present
if (chunk[0] !== 120) { // Hex: 78
const header = Buffer.alloc(2);
header[0] = 120; // Hex: 78
header[1] = 156; // Hex: 9C
this.push(header, encoding);
}
}
this.__transform(chunk, encoding, callback);
}
}
export default ZlibHeaderTransformStream;