webp-container-spec: make padding byte=0 a MUST

this is consistent with the RIFF specification.

based on comments from:
https://datatracker.ietf.org/doc/draft-zern-webp/ballot/#draft-zern-webp_robert-wilton

Bug: webp:448
Change-Id: I7a09177c9ea001b2e8759dcc5102242864c78105
This commit is contained in:
James Zern 2022-09-26 17:31:05 -07:00
parent 41f0bf680b
commit 280a810f2a

View File

@ -128,9 +128,8 @@ Chunk Size: 32 bits (_uint32_)
Chunk Payload: _Chunk Size_ bytes
: The data payload. If _Chunk Size_ is odd, a single padding byte -- that
SHOULD be `0` to conform with RIFF -- is added. Applications MAY use
another value, but readers may fail to parse the file.
: The data payload. If _Chunk Size_ is odd, a single padding byte -- that MUST
be `0` to conform with RIFF -- is added.
**Note:** RIFF has a convention that all-uppercase chunk FourCCs are standard
chunks that apply to any RIFF file format, while FourCCs specific to a file