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eth2.0-specs
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bits serialization clear now, directly to bytes

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protolambda 2019-07-12 22:20:07 +02:00
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specs/simple-serialize.md
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@ -120,8 +120,10 @@ return b""
### `Bitvector[N]` ### `Bitvector[N]`
```python ```python
as_integer = sum([value[i] << i for i in range(len(value))]) array = [0] * ((N + 7) // 8)
return as_integer.to_bytes((N + 7) // 8, "little") for i in range(N):
array[i // 8] |= value[i] << (i % 8)
return bytes(array)
``` ```
### `Bitlist[N]` ### `Bitlist[N]`
@ -129,8 +131,11 @@ return as_integer.to_bytes((N + 7) // 8, "little")
Note that from the offset coding, the length (in bytes) of the bitlist is known. An additional leading `1` bit is added so that the length in bits will also be known. Note that from the offset coding, the length (in bytes) of the bitlist is known. An additional leading `1` bit is added so that the length in bits will also be known.
```python ```python
as_integer = (1 << len(value)) + sum([value[i] << i for i in range(len(value))]) array = [0] * ((len(value) // 8) + 1)
return as_integer.to_bytes((as_integer.bit_length() + 7) // 8, "little") for i in range(len(value)):
array[i // 8] |= value[i] << (i % 8)
array[len(value) // 8] |= 1 << (len(value) % 8)
return bytes(array)
``` ```
### Vectors, containers, lists, unions ### Vectors, containers, lists, unions