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Small update to brotli specification.

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Clarify how to recover from error conditions caused by overflowing
block types and symbol values.
This commit is contained in:
Zoltan Szabadka 2014-01-06 16:35:24 +01:00
parent d762bc6845
commit e60dbdb10b
1 changed files with 8 additions and 4 deletions
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12
brotlispec.txt
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@ -432,7 +432,9 @@ Abstract
The value of ALPHABET_BITS depends on the alphabet of the Huffman
code: it is the smallest number of bits that can represent all
symbols in the alphabet. E.g. for the alphabet of literal bytes,
ALPHABET_BITS is 8.
ALPHABET_BITS is 8. The value of each of the NSYM symbols above is
the value of the ALPHABETS_BITS width machine integer representing
the symbol modulo the alphabet size of the Huffman code.
The (non-zero) code lengths of the symbols can be reconstructed as
follows:
@ -714,9 +716,11 @@ Abstract
alphabet. A block type code 0 means that the block type is the same
as the type of the second last block from the same block category,
while a block type code 1 means that the block type equals the last
block type plus one. Block type codes 2 - 257 represent block types
0 - 255. The second last and last block types are initialized with 0
and 1, respectively, at the beginning of each meta-block.
block type plus one. If the last block type is the maximal possible,
then a block type code 1 means block type 0. Block type codes 2 - 257
represent block types 0 - 255. The second last and last block types
are initialized with 0 and 1, respectively, at the beginning of each
meta-block.
The first block type of each block category must be 0 and the block
type of the first block switch command is therefore not encoded in