Envelope

Transport container with data compression and checksum validation

Header

Offset	Size	Name	Description
0	4	magic	(ubyte[4]) MagicBytes = 0xDEADBEEF
4	4	schema	(uint) Container version (for future)
8	4	level	(CompressionLevel:uint) ZLIB level: none=0, zlib9=9
12	8	datsize	(ulong) Data block size
20	8	datsum	(ubyte[8]) Data block checksum (crc64ECMA)
28	4	hdrsum	(ubyte[4]) Header (above 28 bytes) checksum (crc32)

Data

Offset	Size	Name	Description
32	...	data	(ubyte[]) Data block
		tail	(ubyte[]) Rest of incoming buffer after the end of envelope
		errorstate	(bool) Error state after incoming buffer parsed and validated
		errors	(string[]) Error list after incoming buffer parsed and validated

Methods

Constructor from buffer

Envelope(ubyte[] buf); - try to find first header, validate it, cut the tail and set error status

Constructor from scratch

Envelope(uint schema, uint level, ref ubyte[] data); - build envelope, compress data if needed and set checksums

Transport buffer exporter

toBuffer() - returns ubyte[] with whole envelope

Data extractor

toData() - returns ubyte[] with uncompressed data block