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docs: add chunk file format

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Fabian Reinartz 2017-04-24 10:33:08 +02:00
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# Chunks Disk Format
The following describes the format of a single chunks file, which is created in the `chunks/` directory of a block.
```
┌────────────────────────────┬──────────────────┐
│ magic(0x85BD40DD) <4 byte> | version <1 byte> │
├────────────────────────────┴──────────────────┤
│ Body ... │
└───────────────────────────────────────────────┘
```
Available versions:
* v1 (`1`)
## Body (v1)
The body contains a sequence of chunks, each of which has the following format.
```
┌─────────────────────────────────────────────────────────┐
│ ┌──────────────┬───────────────────┬────────────┐ │
│ │ len <varint> | encoding <1 byte> │ data │ ... │
│ └──────────────┴───────────────────┴────────────┘ │
└─────────────────────────────────────────────────────────┘
```
The length marks the length of the encoding byte and data combined.
The CRC checksum is calculated over the encoding byte and data.