Package bmstruct provides structures and methods to manage byte slices with
embedded values.
The following byte slice of 8 bytes contains an uint16 (2 bytes) starting at the offset 3:
0: 01000001 1: 00010000 2: 01000111 3: |01001001| 4: |10010101| 5: 01011001 6: 01010011 7: 00110101
With the package bmstruct, this data structure can be managed easily. First,
let’s create a bmstruct.Template that describes the location of the uint16
value inside the byte slice:
t := NewTemplate(8, Uint16Field("value"), 3)This template can be applied on any byte slice with length of 8. The result is a
bmstruct.Struct.
b := make([]byte, 8)
s := t.New(b)bmstruct.Struct can be easily manipulated with the Lookup and Update methods:
v := s.Lookup("value") // returns bmstruct.Value
fmt.Println("v: ", v.Uint16()) // shall print v: 0The Update method can be used for changing the byte slice behind the Struct.
s.Update("value", Uint16(42))The byte slice will look like this:
0: 00000000 1: 00000000 2: 00000000 3: |00101010| 4: |00000000| 5: 00000000 6: 00000000 7: 00000000