Decompress Binary Data – Streaming

The Inflate module provides zlib decompression using a subset of the Pako API.

Stream multiple compressed input data buffers to Inflate by setting the second argument to push() to true on only the last buffer.

const inflator = new Inflate();

const compressedData = Uint8Array.of(
	0x78, 0xda, 0xed, 0xc5, 0xb1, 0x0d,
	0x00, 0x20, 0x08, 0x00, 0x30, 0x04,
	0x84, 0xff, 0x3f, 0xf6, 0x0e, 0x93,
	0x76, 0x69, 0x9c, 0xac, 0xbe, 0xb3,
	0x61, 0xdb, 0xb6, 0x6d, 0xdb, 0xb6,
	0x6d, 0xdb, 0xb6, 0x6d, 0xdb, 0xb6,
	0xbf, 0xfd, 0x01, 0x19, 0x00, 0x70,
	0x01);

inflator.push(compressedData.subarray(0, compressedData.length >> 1), false);
inflator.push(compressedData.subarray(compressedData.length >> 1), true);

// => inflator.result is a Uint8Array with 8192 decompressed bytes

inflator.close();

Stream the output of Inflate by implementing onData() and onEnd() callbacks. Streaming output is useful when the decompressed data is larger than available memory.

This compressedData decompresses to 8192 bytes.

const inflator = new Inflate();

inflator.onData = buffer => {
	// => buffer is Uint8Array of decompressed data
};

inflator.onEnd = error => {
	if (error) {
		// decompression failed. handle error.
	}
	else {
		// decompression successfully completed.
	}
};

const compressedData = Uint8Array.of(
	0x78, 0xda, 0xed, 0xc5, 0xb1, 0x0d,
	0x00, 0x20, 0x08, 0x00, 0x30, 0x04,
	0x84, 0xff, 0x3f, 0xf6, 0x0e, 0x93,
	0x76, 0x69, 0x9c, 0xac, 0xbe, 0xb3,
	0x61, 0xdb, 0xb6, 0x6d, 0xdb, 0xb6,
	0x6d, 0xdb, 0xb6, 0x6d, 0xdb, 0xb6,
	0xbf, 0xfd, 0x01, 0x19, 0x00, 0x70,
	0x01);
inflator.push(compressedData, true);

inflator.close();