bitcoder

A python package for describing packed bits and exporting that information to other languages.

Given a simple description of a packed field such as

class Example16Bytes(Encoded):
    bits = 16
    gps_enabled = Bool(start=2)
    latitude = Field(start=3, len=4)
    sbas_enabled = Bool(start=10)

Produces formatted descriptions such as:

0:	Reserved
1:	Reserved
2:	gps_enabled
3:	latitude
4:	latitude
5:	latitude
6:	latitude
7:	Reserved
8:	Reserved
9:	Reserved
10:	sbas_enabled
11:	Reserved
12:	Reserved
13:	Reserved
14:	Reserved
15:	Reserved

Or into various language specific formats such as:

c

struct Example16Bytes
{
    unsigned int reserved_0: 1
    unsigned int gps_enabled: 1
    unsigned int latitude: 4
    unsigned int reserved_1: 1
    unsigned int sbas_enabled: 1
} pack;

C Sharp

public const int gps_enabled_mask = 4;
public const int gps_enabled_start = 2;
public const int latitude_mask = 8;
public const int latitude_start = 3;
public const int sbas_enabled_mask = 1024;
public const int sbas_enabled_start = 10;

json

{
  "Example16Bytes": {
    "gps_enabled": {
      "mask": 4, 
      "start": 2
    }, 
    "latitude": {
      "mask": 8, 
      "start": 3
    }, 
    "sbas_enabled": {
      "mask": 1024, 
      "start": 10
    }
  }
}