Function readUint8ArrayHttpReader

index.cjs:2785–2816

(httpReader, index, length, sendRequest, getRequestData)

}

async function readUint8ArrayHttpReader(httpReader, index, length, sendRequest, getRequestData) {
	const {
		useRangeHeader,
		forceRangeRequests,
		eocdCache,
		size,
		options
	} = httpReader;
	if (useRangeHeader || forceRangeRequests) {
		if (eocdCache && index == size - END_OF_CENTRAL_DIR_LENGTH && length == END_OF_CENTRAL_DIR_LENGTH) {
			return eocdCache;
		}
		if (index >= size || length === 0) {
			return new Uint8Array();
		} else {
			if (index + length > size) {
				length = size - index;
			}
			const response = await sendRequest(HTTP_METHOD_GET, httpReader, getRangeHeaders(httpReader, index, length));
			if (response.status != 206) {
				throw new Error(ERR_HTTP_RANGE);
			}
			return new Uint8Array(await response.arrayBuffer());
		}
	} else {
		const { data } = httpReader;
		if (!data) {
			await getRequestData(httpReader, options);
		}
		return new Uint8Array(httpReader.data.subarray(index, index + length));
	}
}

function getRangeHeaders(httpReader, index = 0, length = 1) {
	return Object.assign({}, getHeaders(httpReader), { [HTTP_HEADER_RANGE]: HTTP_RANGE_UNIT + "=" + (index < 0 ? index : index + "-" + (index + length - 1)) });