Module block 

Block-level framing for the Crous binary format.

Blocks are the fundamental container for data in a Crous file. Each block has:

• A type byte identifying the block kind (data, index, schema, etc.)
• A varint-encoded length
• A compression type byte
• An 8-byte XXH64 checksum of the (uncompressed) payload
• The payload bytes

This module provides BlockWriter for building blocks incrementally and BlockReader for reading them from a byte slice.

Structs

BlockReader

A parsed block read from binary data.

BlockWriter

Builder for a single block’s payload, with framing support.