//#region src/middleware/etag/digest.ts
const mergeBuffers = (buffer1, buffer2) => {
	if (!buffer1) return buffer2;
	const merged = new Uint8Array(new ArrayBuffer(buffer1.byteLength + buffer2.byteLength));
	merged.set(new Uint8Array(buffer1), 0);
	merged.set(buffer2, buffer1.byteLength);
	return merged;
};
const CHUNK_SIZE = 262144;
const generateDigest = async (stream, generator) => {
	if (!stream) return null;
	let result = void 0;
	let chunk;
	let chunkLength = 0;
	const digest = async (body) => {
		result = await generator(mergeBuffers(result, body));
	};
	const reader = stream.getReader();
	for (;;) {
		const { value, done } = await reader.read();
		if (done) break;
		let offset = 0;
		while (offset < value.byteLength) {
			const remaining = value.byteLength - offset;
			if (chunkLength === 0 && remaining >= CHUNK_SIZE) {
				await digest(value.subarray(offset, offset + CHUNK_SIZE));
				offset += CHUNK_SIZE;
				continue;
			}
			const requiredLength = chunkLength + remaining;
			if (requiredLength < CHUNK_SIZE) {
				if (!chunk) chunk = value.slice(offset);
				else {
					if (chunk.byteLength < requiredLength) {
						const nextChunk = new Uint8Array(new ArrayBuffer(Math.min(CHUNK_SIZE, Math.max(requiredLength, chunk.byteLength * 2))));
						nextChunk.set(chunk.subarray(0, chunkLength));
						chunk = nextChunk;
					}
					chunk.set(value.subarray(offset), chunkLength);
				}
				chunkLength = requiredLength;
				break;
			}
			const length = CHUNK_SIZE - chunkLength;
			if (chunk?.byteLength !== CHUNK_SIZE) {
				const nextChunk = new Uint8Array(/* @__PURE__ */ new ArrayBuffer(CHUNK_SIZE));
				if (chunk) nextChunk.set(chunk.subarray(0, chunkLength));
				chunk = nextChunk;
			}
			chunk.set(value.subarray(offset, offset + length), chunkLength);
			await digest(chunk);
			chunkLength = 0;
			offset += length;
		}
	}
	if (chunk && chunkLength > 0) await digest(chunk.subarray(0, chunkLength));
	if (!result) return null;
	return Array.prototype.map.call(new Uint8Array(result), (x) => x.toString(16).padStart(2, "0")).join("");
};
//#endregion
export { generateDigest };