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Viewing file:     headStream.js (1.31 KB)      -rw-r--r--

import { Writable } from "stream";
import { headStream as headWebStream } from "./headStream.browser";
import { isReadableStream } from "./stream-type-check";
export const headStream = (stream, bytes) => {
    if (isReadableStream(stream)) {
        return headWebStream(stream, bytes);
    }
    return new Promise((resolve, reject) => {
        const collector = new Collector();
        collector.limit = bytes;
        stream.pipe(collector);
        stream.on("error", (err) => {
            collector.end();
            reject(err);
        });
        collector.on("error", reject);
        collector.on("finish", function () {
            const bytes = new Uint8Array(Buffer.concat(this.buffers));
            resolve(bytes);
        });
    });
};
class Collector extends Writable {
    buffers = [];
    limit = Infinity;
    bytesBuffered = 0;
    _write(chunk, encoding, callback) {
        this.buffers.push(chunk);
        this.bytesBuffered += chunk.byteLength ?? 0;
        if (this.bytesBuffered >= this.limit) {
            const excess = this.bytesBuffered - this.limit;
            const tailBuffer = this.buffers[this.buffers.length - 1];
            this.buffers[this.buffers.length - 1] = tailBuffer.subarray(0, tailBuffer.byteLength - excess);
            this.emit("finish");
        }
        callback();
    }
}