@loaders.gl/core/dist/iterators/make-iterator/make-array-buffer-iterator.js

The core API for working with loaders.gl loaders and writers

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
const DEFAULT_CHUNK_SIZE = 256 * 1024;
/**
 * Returns an iterator that breaks a big ArrayBuffer into chunks and yields them one-by-one
 * @param blob ArrayBuffer to iterate over
 * @param options
 * @param options.chunkSize
 */
export function* makeArrayBufferIterator(arrayBuffer, options = {}) {
    const { chunkSize = DEFAULT_CHUNK_SIZE } = options;
    let byteOffset = 0;
    while (byteOffset < arrayBuffer.byteLength) {
        // Create a chunk of the right size
        const chunkByteLength = Math.min(arrayBuffer.byteLength - byteOffset, chunkSize);
        const chunk = new ArrayBuffer(chunkByteLength);
        // Copy data from the big chunk
        const sourceArray = new Uint8Array(arrayBuffer, byteOffset, chunkByteLength);
        const chunkArray = new Uint8Array(chunk);
        chunkArray.set(sourceArray);
        // yield the chunk
        byteOffset += chunkByteLength;
        yield chunk;
    }
}