Described below is the format of the 32-byte-long payload sub-header. This format is unique to v1.
| Field |
Type |
Size (bytes) |
Description |
| stored_size |
uint |
8 |
Compressed size, in bytes, of the records.
If records are not compressed, stored_size is equal to plain_size.
|
| plain_size |
uint |
8 |
Uncompressed size, in bytes, of records. |
| checksum |
blob |
8 |
Checksum of records, computed using XXH3_64bits. |
| num_records |
uint |
4 |
Number of records contained in the payload. |
| version |
uint |
2 |
Version of the payload data format. Unused. |
| record_kind |
uint |
1 |
Kind of records that the payload contains. |
| compression |
uint |
1 |
Compression algorithm used for the records. |
record_kind is an enum. The following table lists all possible values:
| Value |
Name |
| 1 |
Uncompressed |
| 2 |
Zstd |
