Function ensureData

lib/serialization/FileMiddleware.js:274–301

(n)

	 * @param {number} n number of bytes to ensure
	 */
	const ensureData = (n) => {
		if (contentPosition === contentItemLength) {
			nextContent();
		}
		while (contentItemLength - contentPosition < n) {
			const remaining = contentItem.subarray(contentPosition);
			let lengthFromNext = n - remaining.length;
			/** @type {Buffer[]} */
			const buffers = [remaining];
			for (let i = contentsIndex + 1; i < contents.length; i++) {
				const l = contents[i].length;
				if (l > lengthFromNext) {
					buffers.push(contents[i].subarray(0, lengthFromNext));
					contents[i] = contents[i].subarray(lengthFromNext);
					lengthFromNext = 0;
					break;
				} else {
					buffers.push(contents[i]);
					contentsIndex = i;
					lengthFromNext -= l;
				}
			}
			if (lengthFromNext > 0) throw new Error("Unexpected end of data");
			contentItem = Buffer.concat(buffers, n);
			contentItemLength = n;
			contentPosition = 0;
		}
	};
	/**
	 * Returns value value.
	 * @returns {number} value value