ethereum.utils.byte
Utility Functions For Byte Strings ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. contents:: Table of Contents :backlinks: none :local:
Introduction
Byte specific utility functions used in this specification.
left_pad_zero_bytes
Left pad zeroes to value if it's length is less than the given size.
Parameters
value : The byte string that needs to be padded. size : The number of bytes that need that need to be padded.
Returns
left_padded_value: ethereum.base_types.Bytes
left padded byte string of given size.
def left_pad_zero_bytes(value: Bytes, size: int) -> Bytes:
| 18 | """ |
|---|---|
| 19 | Left pad zeroes to `value` if it's length is less than the given `size`. |
| 20 | |
| 21 | Parameters |
| 22 | ---------- |
| 23 | value : |
| 24 | The byte string that needs to be padded. |
| 25 | size : |
| 26 | The number of bytes that need that need to be padded. |
| 27 | |
| 28 | Returns |
| 29 | ------- |
| 30 | left_padded_value: `ethereum.base_types.Bytes` |
| 31 | left padded byte string of given `size`. |
| 32 | """ |
| 33 | return value.rjust(size, b"\x00") |
right_pad_zero_bytes
Right pad zeroes to value if it's length is less than the given size.
Parameters
value : The byte string that needs to be padded. size : The number of bytes that need that need to be padded.
Returns
right_padded_value: ethereum.base_types.Bytes
right padded byte string of given size.
def right_pad_zero_bytes(value: Bytes, size: int) -> Bytes:
| 37 | """ |
|---|---|
| 38 | Right pad zeroes to `value` if it's length is less than the given `size`. |
| 39 | |
| 40 | Parameters |
| 41 | ---------- |
| 42 | value : |
| 43 | The byte string that needs to be padded. |
| 44 | size : |
| 45 | The number of bytes that need that need to be padded. |
| 46 | |
| 47 | Returns |
| 48 | ------- |
| 49 | right_padded_value: `ethereum.base_types.Bytes` |
| 50 | right padded byte string of given `size`. |
| 51 | """ |
| 52 | return value.ljust(size, b"\x00") |