Class FileChunker

client/scripts/network.js:423–475

}

class FileChunker {

    constructor(file, onChunk, onPartitionEnd) {
        this._chunkSize = 64000; // 64 KB
        this._maxPartitionSize = 1e6; // 1 MB
        this._offset = 0;
        this._partitionSize = 0;
        this._file = file;
        this._onChunk = onChunk;
        this._onPartitionEnd = onPartitionEnd;
        this._reader = new FileReader();
        this._reader.addEventListener('load', e => this._onChunkRead(e.target.result));
    }

    nextPartition() {
        this._partitionSize = 0;
        this._readChunk();
    }

    _readChunk() {
        const chunk = this._file.slice(this._offset, this._offset + this._chunkSize);
        this._reader.readAsArrayBuffer(chunk);
    }

    _onChunkRead(chunk) {
        this._offset += chunk.byteLength;
        this._partitionSize += chunk.byteLength;
        this._onChunk(chunk);
        if (this.isFileEnd()) return;
        if (this._isPartitionEnd()) {
            this._onPartitionEnd(this._offset);
            return;
        }
        this._readChunk();
    }

    repeatPartition() {
        this._offset -= this._partitionSize;
        this._nextPartition();
    }

    _isPartitionEnd() {
        return this._partitionSize >= this._maxPartitionSize;
    }

    isFileEnd() {
        return this._offset >= this._file.size;
    }

    get progress() {
        return this._offset / this._file.size;
    }
}

class FileDigester {