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Merge rust-bitcoin/rust-bitcoin#1375: Witness: Fix nits from PR 1323 

00c7b6e06f Witness: Fix nits from PR 1323 (junderw)

Pull request description:

  Ref: #1323

  This is just to quickly fix some of the smaller nits. Larger changes (deprecations, adding / refactoring of methods) should be in a separate PR.

ACKs for top commit:
  Kixunil:
    ACK 00c7b6e06f
  tcharding:
    ACK 00c7b6e06f
  sanket1729:
    ACK 00c7b6e06f

Tree-SHA512: 5f661187a7003060669d15d873e323c017c905a00b62eb56ca3afc2fc27084b245ad62dfcf6d2fd14eac361430be954e7636f6b9ff668aefaad0424789a2f826
This commit is contained in:
sanket1729 2022-11-12 02:03:43 -08:00
parent 1d0b0e6ed8 00c7b6e06f
commit 15ff4bffd7
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GPG Key ID: 648FFB183E0870A2
1 changed files with 12 additions and 14 deletions
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26
bitcoin/src/blockdata/witness.rs
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@ -17,8 +17,6 @@ use crate::io::{self, Read, Write};
use crate::prelude::*;
use crate::VarInt;
const U32_SIZE: usize = core::mem::size_of::<u32>();
/// The Witness is the data used to unlock bitcoins since the [segwit upgrade](https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki)
///
/// Can be logically seen as an array of byte-arrays `Vec<Vec<u8>>` and indeed you can convert from
@ -66,7 +64,7 @@ impl Decodable for Witness {
} else {
// Leave space at the head for element positions.
// We will rotate them to the end of the Vec later.
let witness_index_space = witness_elements * U32_SIZE;
let witness_index_space = witness_elements * 4;
let mut cursor = witness_index_space;
// this number should be determined as high enough to cover most witness, and low enough
@ -120,18 +118,18 @@ impl Decodable for Witness {
}
/// Safety Requirements: value must always fit within u32
/// Correctness Requirements: value must always fit within u32
#[inline]
fn encode_cursor(bytes: &mut [u8], start_of_indices: usize, index: usize, value: usize) {
let start = start_of_indices + index * U32_SIZE;
let end = start + U32_SIZE;
bytes[start..end].copy_from_slice(&(value as u32).to_ne_bytes()[..]);
let start = start_of_indices + index * 4;
let end = start + 4;
bytes[start..end].copy_from_slice(&u32::to_ne_bytes(value.try_into().expect("Larger than u32")));
}
#[inline]
fn decode_cursor(bytes: &[u8], start_of_indices: usize, index: usize) -> Option<usize> {
let start = start_of_indices + index * U32_SIZE;
let end = start + U32_SIZE;
let start = start_of_indices + index * 4;
let end = start + 4;
if end > bytes.len() {
None
} else {
@ -154,7 +152,7 @@ impl Encodable for Witness {
let len = VarInt(self.witness_elements as u64);
len.consensus_encode(w)?;
let content_with_indices_len = self.content.len();
let indices_size = self.witness_elements * U32_SIZE;
let indices_size = self.witness_elements * 4;
let content_len = content_with_indices_len - indices_size;
w.emit_slice(&self.content[..content_len])?;
Ok(content_len + len.len())
@ -170,7 +168,7 @@ impl Witness {
/// Creates [`Witness`] object from an array of byte-arrays
pub fn from_vec(vec: Vec<Vec<u8>>) -> Self {
let witness_elements = vec.len();
let index_size = witness_elements * U32_SIZE;
let index_size = witness_elements * 4;
let content_size: usize = vec
.iter()
@ -245,7 +243,7 @@ impl Witness {
let current_content_len = self.content.len();
let new_item_total_len = element_len_varint.len() + new_element.len();
self.content
.resize(current_content_len + new_item_total_len + U32_SIZE, 0);
.resize(current_content_len + new_item_total_len + 4, 0);
self.content[previous_content_end..].rotate_right(new_item_total_len);
self.indices_start += new_item_total_len;
@ -350,7 +348,7 @@ impl<'a> Iterator for Iter<'a> {
}
fn size_hint(&self) -> (usize, Option<usize>) {
let total_count = (self.inner.len() - self.indices_start) / U32_SIZE;
let total_count = (self.inner.len() - self.indices_start) / 4;
let remaining = total_count - self.current_index;
(remaining, Some(remaining))
}
@ -459,7 +457,7 @@ mod test {
fn append_u32_vec(mut v: Vec<u8>, n: &[u32]) -> Vec<u8> {
for &num in n {
v.extend_from_slice(&num.to_ne_bytes()[..]);
v.extend_from_slice(&num.to_ne_bytes());
}
v
}