isRawBuffer()

isRawBuffer(bytes): boolean

Returns whether bytes is a raw (uncompressed) fragments buffer rather than a pako/zlib-deflated one, by inspecting the first two bytes.

A deflated fragments buffer is a zlib stream: byte 0's low nibble is the deflate compression method (8) and (byte0 << 8 | byte1) is a multiple of 31 (the zlib header check). A raw fragments buffer is a flatbuffer, whose leading 32-bit root offset does not satisfy that. This lets load and the model constructors accept either form without the caller tracking which it is.

In the extremely unlikely case a raw buffer's first two bytes happen to look like a zlib header, pass raw explicitly to override the detection.

Performance note: a raw (uncompressed) model is the fastest to load. Only deflate a fragments buffer when you persist it to disk or send it over the network. Inflating and deflating on every load, with no transport in between, just wastes CPU.

Parameters

Parameter	Type
bytes	Uint8Array

Returns

boolean