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webp-container-spec: update note on trailing data

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clarify that the data is after the size specified by the file size in
the header; an alternate way to read the previous statement was that the
data was after the 'WEBP' fourcc.

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

Bug: webp:448
Change-Id: I7c5c5440a94cb817da51fe07d1ccf45d6af0f001
This commit is contained in:
James Zern 2022-09-26 17:28:54 -07:00
parent 6bdd36dbe7
commit 41f0bf680b
1 changed files with 5 additions and 4 deletions

9
doc/webp-container-spec.txt

@ -166,10 +166,11 @@ File Size: 32 bits (_uint32_)
A WebP file MUST begin with a RIFF header with the FourCC 'WEBP'. The file size
in the header is the total size of the chunks that follow plus `4` bytes for
the 'WEBP' FourCC. The file SHOULD NOT contain anything after it. Readers MAY
parse such files, ignoring the trailing data. As the size of any chunk is even,
the size given by the RIFF header is also even. The contents of individual
chunks will be described in the following sections.
the 'WEBP' FourCC. The file SHOULD NOT contain any data after the data
specified by _File Size_. Readers MAY parse such files, ignoring the trailing
data. As the size of any chunk is even, the size given by the RIFF header is
also even. The contents of individual chunks will be described in the following
sections.
Simple File Format (Lossy)