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Merge rust-bitcoin/rust-bitcoin#2930: Improve docs on private `Witness` fields 

c717f7f424 Improve docs on private Witness fields (Tobin C. Harding)

Pull request description:

  The `Witness` type is a reasonable complex data structure, make an effort to clarify its structure in the docs on the private fields.

  Private docs only.

  (Original idea pulled out of #2133.)

ACKs for top commit:
  Kixunil:
    ACK c717f7f424
  apoelstra:
    ACK c717f7f424 much clearer, thanks!

Tree-SHA512: 9d54b7eeefec97e584fb5f275049dbac0473c949fae8ab05c6961d6fc424c17a058af7037c2220ef1446af294d78c68bfee741cfeca1b18ecc402935d8069dab
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merge-script 2024-06-30 22:48:18 +00:00
parent 96dffb2152 c717f7f424
commit 45e311cab9
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1 changed files with 10 additions and 4 deletions
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14
bitcoin/src/blockdata/witness.rs
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@ -28,8 +28,12 @@ use crate::{Script, VarInt};
/// [segwit upgrade]: <https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki>
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Witness {
/// Contains the witness `Vec<Vec<u8>>` serialization without the initial varint indicating the
/// number of elements (which is stored in `witness_elements`).
/// Contains the witness `Vec<Vec<u8>>` serialization.
///
/// Does not include the initial varint indicating the number of elements, instead this is
/// stored stored in `witness_elements`. Concatenated onto the end of `content` is the index
/// area, this is a `4 * witness_elements` bytes area which stores the index of the start of
/// each witness item.
content: Vec<u8>,
/// The number of elements in the witness.
@ -38,8 +42,10 @@ pub struct Witness {
/// like [`Witness::push`] don't have to shift the entire array.
witness_elements: usize,
/// This is the valid index pointing to the beginning of the index area. This area is 4 *
/// stack_size bytes at the end of the content vector which stores the indices of each item.
/// This is the valid index pointing to the beginning of the index area.
///
/// Said another way, this is the total length of all witness elements serialized (without the
/// element count but with their sizes serialized as compact size).
indices_start: usize,
}