constants.h

Section: C Library Functions (3)
Updated: August 2021
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NAME

constants.h - Common constants used in decoder and encoder API.

 

SYNOPSIS

 

Macros

#define BROTLI_LARGE_MAX_DISTANCE_BITS 62U
The theoretical maximum number of distance bits specified for large window brotli, for 6-bit encoders and decoders.
#define BROTLI_LARGE_MAX_WBITS 30
The maximum supported large brotli window bits by the encoder and decoder.
#define BROTLI_MAX_NPOSTFIX 3
Maximal number of 'postfix' bits.  

Detailed Description

Common constants used in decoder and encoder API.

 

Macro Definition Documentation

 

#define BROTLI_LARGE_MAX_DISTANCE_BITS 62U

The theoretical maximum number of distance bits specified for large window brotli, for 6-bit encoders and decoders. Even when in practice 3-bit encoders and decoders only support up to 30 max distance bits, the value is set to 62 because it affects the large window brotli file format. Specifically, it affects the encoding of simple huffman tree for distances, see Specification RFC 7932 chapter 3.4.  

#define BROTLI_LARGE_MAX_WBITS 30

The maximum supported large brotli window bits by the encoder and decoder. Large window brotli allows up to 62 bits, however the current encoder and decoder, designed for 3-bit integers, only support up to 30 bits maximum.  

#define BROTLI_MAX_NPOSTFIX 3

Maximal number of 'postfix' bits. Number of 'postfix' bits is stored as 2 bits in met-block header.  

Author

Generated automatically by Doxygen for Brotli from the source code.

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Index

NAME

SYNOPSIS

Macros

Detailed Description

Macro Definition Documentation

#define BROTLI_LARGE_MAX_DISTANCE_BITS 62U

#define BROTLI_LARGE_MAX_WBITS 30

#define BROTLI_MAX_NPOSTFIX 3

Author