Description
- works with skippables frame id 0x184D2A50 (12 bytes per compressed frame)
- brotli is supported the same way, it will encapsulate the real brotli stream
within an 16 byte frame header
Generic skippable frame definition
size |
value |
description |
4 bytes |
0x184D2A50U |
magic for skippable frame |
4 bytes |
4 |
size of skippable frame |
4 bytes |
compressed size |
size of the following frame (compressed data) |
Brotli frame definition
- the frame header for brotli is defined a bit different:
size |
value |
description |
4 bytes |
0x184D2A50U |
magic for skippable frame (like zstd) |
4 bytes |
8 |
size of skippable frame |
4 bytes |
compressed size |
size of the following frame (compressed data) |
2 bytes |
0x5242U |
magic for brotli "BR" |
2 bytes |
uncompressed size |
allocation hint for decompressor (64KB * this size) |
Snappy-c frame definition
- the frame header for Snappy-c is defined a bit different:
size |
value |
description |
4 bytes |
0x184D2A50U |
magic for skippable frame (like zstd) |
4 bytes |
8 |
size of skippable frame |
4 bytes |
compressed size |
size of the following frame (compressed data) |
2 bytes |
0x5053U |
magic for Snappy-c "SP" |
2 bytes |
uncompressed size |
allocation hint for decompressor (64KB * this size) |
LZFSE frame definition
- the frame header for Lzfse is defined a bit different:
size |
value |
description |
4 bytes |
0x184D2A50U |
magic for skippable frame (like zstd) |
4 bytes |
8 |
size of skippable frame |
4 bytes |
compressed size |
size of the following frame (compressed data) |
2 bytes |
0x464CU |
magic for Lzfse "LF" |
2 bytes |
uncompressed size |
allocation hint for decompressor (64KB * this size) |
Usage of the Testutils
Usage of the Library
/TR 2020-10-15