| 67 | } |
| 68 | |
| 69 | fn from_bytes(bytes: &[u8]) -> value::Result<Self> { |
| 70 | let arr: [u8; 37] = bytes.try_into().map_err(|_| value::Error::InvalidEncoding)?; |
| 71 | let flags = arr[4]; |
| 72 | let rlp = if flags & HASH_FLAG == HASH_FLAG { |
| 73 | RlpNode::word_rlp(&B256::from_slice(&arr[5..37])) |
| 74 | } else { |
| 75 | // Because the RLP string must be 1-32 bytes, we can safely use the first byte to |
| 76 | // determine the length. If the first byte is less than 0x80, then this byte |
| 77 | // is the actual encoded value. Otherwise, the length is first_rlp_byte - |
| 78 | // 0x80, and the remaining bytes are the encoded U256 value. |
| 79 | let first_rlp_byte = arr[5]; |
| 80 | if first_rlp_byte < 0x80 { |
| 81 | RlpNode::from_raw(&[first_rlp_byte]).unwrap() |
| 82 | } else if first_rlp_byte <= 0xa0 { |
| 83 | let rlp_len = first_rlp_byte - 0x80; |
| 84 | RlpNode::from_raw(&arr[5..6 + rlp_len as usize]).unwrap() |
| 85 | } else if (0xc0..=0xdf).contains(&first_rlp_byte) { |
| 86 | let rlp_len = first_rlp_byte - 0xc0; |
| 87 | RlpNode::from_raw(&arr[5..6 + rlp_len as usize]).unwrap() |
| 88 | } else { |
| 89 | return Err(value::Error::InvalidEncoding); |
| 90 | } |
| 91 | }; |
| 92 | Ok(Pointer::new(Location::from(u32::from_be_bytes(arr[..4].try_into().unwrap())), rlp)) |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | impl From<Pointer> for [u8; 37] { |