enassiFile format
The enassi file format is a bit like the ZIP file format, stored in little-endian ordering.
It has 2 parts:
- File header: only have one.
- Item file: currently only one is used. document
File header (30 bytes)
| usage | length | remark |
|---|---|---|
| File header signature | 4 bytes | 'PK\x03\x04' |
| File format version | 2 bytes | Defaults 1 |
| User data structure version | 2 bytes | Defaults 1 |
| CRC-32 | 4 bytes | Can be 0 |
| File last modification UTC timestamp | 8 bytes | Max: 2286-11-21 01:46:39 |
| Empty | 10 bytes | 0 |
Item header (50 bytes)
| usage | length | remark |
|---|---|---|
| Item header signature | 4 bytes | 'PK\x01\x02' |
| CRC-32 | 4 bytes | crc32(sha256(file content)) |
| Item last modification UTC timestamp | 8 bytes | Max: 2286-11-21 01:46:39 |
| Item file name length | 2 bytes | Max: 32767 |
| Item file data length | 4 bytes | Max: 2147483647(2T) |
| Empty | 28 bytes | 0 |
Item body
| usage | length | remark |
|---|---|---|
| Item file name | variable | Can be none |
| Item file data | variable | Can be none |
Item tail (20 bytes)
| usage | length | remark |
|---|---|---|
| End of item signature | 4 bytes | 'PK\x05\x06' |
| Empty | 16 bytes | 0 |