Function encode_bytes

pub fn encode_bytes(input: &[u8], out: &mut [u8]) -> usize

Encodes the bytes argument for the Solidity ABI. The result is written to out.

Returns the number of bytes written.

Important

This function assumes that the encoded bytes argument follows two previous other argument that takes up 32 bytes.

So e.g. function(uint32, bool, bytes) (with uint32 and bool being of word size 32 bytes). This assumption is made to calculate the offset word.

Developer Note

The returned layout will be

[offset (32 bytes)] [len (32 bytes)] [data (padded to 32)]

The out byte array needs to be able to hold (in the worst case) 95 bytes more than input.len(). This is because we write the following to out:

• The offset word → always 32 bytes.
• The length word → always 32 bytes.
• The input itself → exactly input.len() bytes.
• We pad the input to a multiple of 32 → between 0 and 31 extra bytes.