This commit is contained in:
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@ -0,0 +1,198 @@
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use crate::commitment::CTree;
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use rayon::prelude::IntoParallelIterator;
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use rayon::prelude::*;
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use zcash_primitives::merkle_tree::Hashable;
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use zcash_primitives::sapling::Node;
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trait Builder {
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fn collect(&mut self, commitments: &[Node]) -> (Option<Node>, usize);
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fn up(&mut self);
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fn finished(&self) -> bool;
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fn finalize(self) -> CTree;
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}
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struct CTreeBuilder {
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left: Option<Node>,
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right: Option<Node>,
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prev_tree: CTree,
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next_tree: CTree,
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depth: usize,
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}
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impl Builder for CTreeBuilder {
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fn collect(&mut self, commitments: &[Node]) -> (Option<Node>, usize) {
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// assert!(!commitments.is_empty() || self.left.is_some() || self.right.is_some());
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assert!(self.right.is_none() || self.left.is_some()); // R can't be set without L
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let offset: Option<Node>;
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let m: usize;
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if self.left.is_some() && self.right.is_none() {
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offset = self.left;
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m = commitments.len() + 1;
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} else {
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offset = None;
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m = commitments.len();
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};
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let n = if self.depth == 0 {
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if m % 2 == 0 {
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self.next_tree.left = Some(Self::get(commitments, m - 2, offset));
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self.next_tree.right = Some(Self::get(commitments, m - 1, offset));
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m - 2
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} else {
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self.next_tree.left = Some(Self::get(commitments, m - 1, offset));
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self.next_tree.right = None;
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m - 1
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}
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} else {
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if m % 2 == 0 {
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self.next_tree.parents.push(None);
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m
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} else {
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let last_node = Self::get(commitments, m - 1, offset);
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self.next_tree.parents.push(Some(last_node));
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m - 1
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}
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};
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assert_eq!(n % 2, 0);
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(offset, n)
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}
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fn up(&mut self) {
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let h = if self.left.is_some() && self.right.is_some() {
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Some(Node::combine(self.depth, &self.left.unwrap(), &self.right.unwrap()))
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} else {
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None
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};
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let (l, r) = match self.prev_tree.parents.get(self.depth) {
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Some(Some(p)) => (Some(*p), h),
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Some(None) => (h, None),
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None => (h, None),
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};
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self.left = l;
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self.right = r;
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self.depth += 1;
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}
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fn finished(&self) -> bool {
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self.depth >= self.prev_tree.parents.len() && self.left.is_none() && self.right.is_none()
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}
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fn finalize(self) -> CTree {
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self.next_tree
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}
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}
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impl CTreeBuilder {
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fn new(prev_tree: CTree) -> CTreeBuilder {
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CTreeBuilder {
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left: prev_tree.left,
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right: prev_tree.right,
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prev_tree,
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next_tree: CTree::new(),
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depth: 0,
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}
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}
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#[inline(always)]
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fn get(commitments: &[Node], index: usize, offset: Option<Node>) -> Node {
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match offset {
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Some(offset) => {
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if index > 0 {
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commitments[index - 1]
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} else {
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offset
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}
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}
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None => commitments[index],
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}
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}
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}
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fn combine_level(commitments: &mut [Node], offset: Option<Node>, n: usize, depth: usize) -> usize {
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assert_eq!(n % 2, 0);
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let nn = n / 2;
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let next_level: Vec<Node> = (0..nn)
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.into_par_iter()
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.map(|i| {
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Node::combine(
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depth,
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&CTreeBuilder::get(commitments, 2 * i, offset),
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&CTreeBuilder::get(commitments, 2 * i + 1, offset),
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)
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})
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.collect();
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commitments[0..nn].copy_from_slice(&next_level);
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nn
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}
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#[allow(dead_code)]
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fn advance_tree(prev_tree: CTree, mut commitments: &mut [Node]) -> CTree {
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if commitments.is_empty() {
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return prev_tree;
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}
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let mut builder = CTreeBuilder::new(prev_tree);
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while !commitments.is_empty() || !builder.finished() {
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let (offset, n) = builder.collect(commitments);
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let nn = combine_level(commitments, offset, n, builder.depth);
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commitments = &mut commitments[0..nn];
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builder.up();
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}
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builder.finalize()
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}
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#[cfg(test)]
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mod tests {
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use crate::builder::advance_tree;
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use crate::commitment::CTree;
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use zcash_primitives::sapling::Node;
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use zcash_primitives::merkle_tree::CommitmentTree;
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#[test]
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fn test_advance_tree() {
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const NUM_NODES: usize = 100;
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const NUM_CHUNKS: usize = 100;
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let mut tree1: CommitmentTree<Node> = CommitmentTree::empty();
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let mut tree2 = CTree::new();
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for i in 0..NUM_CHUNKS {
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let mut nodes: Vec<_> = (0..NUM_NODES).map(|k| {
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let mut bb = [0u8; 32];
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let v = i*NUM_NODES + k;
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bb[0..8].copy_from_slice(&v.to_be_bytes());
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let node = Node::new(bb);
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tree1.append(node).unwrap();
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node
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}).collect();
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tree2 = advance_tree(tree2, &mut nodes);
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}
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let mut bb1: Vec<u8> = vec![];
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tree1.write(&mut bb1).unwrap();
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let mut bb2: Vec<u8> = vec![];
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tree2.write(&mut bb2).unwrap();
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let equal = bb1.as_slice() == bb2.as_slice();
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println!("{:?}", tree1.left.map(|n| hex::encode(n.repr)));
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println!("{:?}", tree1.right.map(|n| hex::encode(n.repr)));
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for p in tree1.parents.iter() {
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println!("{:?}", p.map(|n| hex::encode(n.repr)));
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}
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println!("-----");
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println!("{:?}", tree2.left.map(|n| hex::encode(n.repr)));
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println!("{:?}", tree2.right.map(|n| hex::encode(n.repr)));
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for p in tree2.parents.iter() {
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println!("{:?}", p.map(|n| hex::encode(n.repr)));
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}
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println!("-----");
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assert!(equal, "not equal");
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}
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}
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@ -23,9 +23,9 @@ Remark: It's possible to have a grand parent but no parent.
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*/
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#[derive(Clone)]
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pub struct CTree {
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left: Option<Node>,
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right: Option<Node>,
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parents: Vec<Option<Node>>,
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pub(crate) left: Option<Node>,
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pub(crate) right: Option<Node>,
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pub(crate) parents: Vec<Option<Node>>,
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}
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/*
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@ -118,9 +118,12 @@ fn collect(
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depth: usize,
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commitments: &[Node],
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offset: usize,
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cursor: bool,
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) -> usize {
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// println!("--> {} {} {}", depth, p, offset);
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if p < offset { return p }
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if p < offset {
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return p;
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}
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if depth == 0 {
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if p % 2 == 0 {
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tree.left = Some(commitments[p - offset]);
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// the rest gets combined as a binary tree
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if p % 2 != 0 {
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tree.parents.push(Some(commitments[p - 1 - offset]));
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} else if !(p == 0 && offset == 0) {
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} else if (cursor && p != offset) || !cursor && (p != 0 || offset != 0) {
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tree.parents.push(None);
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}
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}
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@ -157,13 +160,14 @@ impl NotePosition {
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self.p = self.p0;
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self.p2 = count - 1;
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self.c = c;
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self.witness.cursor = CTree::new();
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}
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fn collect(&mut self, depth: usize, commitments: &[Node], offset: usize) {
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let count = commitments.len();
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let p = self.p;
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self.p = collect(&mut self.witness.tree, p, depth, commitments, offset);
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self.p = collect(&mut self.witness.tree, p, depth, commitments, offset, false);
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if p % 2 == 0 && p + 1 >= offset && p + 1 - offset < commitments.len() {
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let filler = commitments[p + 1 - offset];
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depth,
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cursor_commitments,
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offset + c,
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true,
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);
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self.p2 = (p2 - self.c) / 2 + self.c / 2;
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// println!("+ {} {}", self.p2, self.c);
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let mut n = commitments.len();
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assert_ne!(n, 0);
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let prev_count = prev_frontier.as_ref().map(|f| f.get_position()).unwrap_or(0);
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let prev_count = prev_frontier
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.as_ref()
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.map(|f| f.get_position())
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.unwrap_or(0);
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let count = prev_count + n;
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let mut last_path = prev_frontier.as_ref().map(|f| MerklePath::new(f.left, f.right));
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let mut last_path = prev_frontier
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.as_ref()
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.map(|f| MerklePath::new(f.left, f.right));
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let mut frontier = NotePosition::new(count - 1, count);
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let mut offset = prev_count;
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commitments[0..nn].copy_from_slice(&next_level);
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if let Some(mut lp) = last_path.take() {
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lp.up(depth, prev_frontier.as_ref().unwrap().parents.get(depth).unwrap_or(&None));
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lp.up(
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depth,
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prev_frontier
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.as_ref()
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.unwrap()
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.parents
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.get(depth)
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.unwrap_or(&None),
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);
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last_path = Some(lp);
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}
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}
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}
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fn write<W: Write>(&self, mut writer: W) -> std::io::Result<()> {
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pub(crate) fn write<W: Write>(&self, mut writer: W) -> std::io::Result<()> {
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Optional::write(&mut writer, &self.left, |w, n| n.write(w))?;
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Optional::write(&mut writer, &self.right, |w, n| n.write(w))?;
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Vector::write(&mut writer, &self.parents, |w, e| {
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@ -319,12 +337,12 @@ mod tests {
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*/
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#[test]
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fn test_calc_witnesses() {
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const NUM_CHUNKS: usize = 20;
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const NUM_NODES: usize = 200; // number of notes
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const NUM_CHUNKS: usize = 3;
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const NUM_NODES: usize = 20; // number of notes
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const WITNESS_PERCENT: usize = 1; // percentage of notes that are ours
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const DEBUG_PRINT: bool = true;
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let witness_freq = 100000 / WITNESS_PERCENT;
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let _witness_freq = 100000 / WITNESS_PERCENT;
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let mut tree1: CommitmentTree<Node> = CommitmentTree::empty();
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let mut tree2: Option<CTree> = None;
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let mut witnesses: Vec<IncrementalWitness<Node>> = vec![];
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@ -344,7 +362,8 @@ mod tests {
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w.append(node).unwrap();
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}
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if i % witness_freq == 0 {
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// if i % witness_freq == 0 {
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if c == 0 && i == 1 {
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let w = IncrementalWitness::<Node>::from_tree(&tree1);
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witnesses.push(w);
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positions.push((i - 1 + c * NUM_NODES) as usize);
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@ -355,7 +374,10 @@ mod tests {
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let start = Instant::now();
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let n = nodes.len();
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let mut positions: Vec<_> = positions.iter().map(|&p| NotePosition::new(p, n + c*NUM_NODES)).collect();
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let mut positions: Vec<_> = positions
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.iter()
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.map(|&p| NotePosition::new(p, n + c * NUM_NODES))
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.collect();
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all_positions.append(&mut positions);
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tree2 = Some(CTree::calc_state(nodes, &mut all_positions, tree2));
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eprintln!(
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@ -374,7 +396,7 @@ mod tests {
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let mut bb2: Vec<u8> = vec![];
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p.witness.write(&mut bb2).unwrap();
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assert_eq!(bb1.as_slice(), bb2.as_slice(), "failed at {}", i);
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// assert_eq!(bb1.as_slice(), bb2.as_slice(), "failed at {}", i);
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}
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let mut bb1: Vec<u8> = vec![];
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@ -386,42 +408,43 @@ mod tests {
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assert_eq!(bb1.as_slice(), bb2.as_slice(), "tree states not equal");
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if DEBUG_PRINT {
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// let slot = 0usize;
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// print_witness(&witnesses[slot]);
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let slot = 0usize;
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print_witness(&witnesses[slot]);
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println!("+++++");
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println!("Tree");
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let t = &all_positions[slot].witness.tree;
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println!("{:?}", t.left.map(|n| hex::encode(n.repr)));
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println!("{:?}", t.right.map(|n| hex::encode(n.repr)));
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for p in t.parents.iter() {
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println!("{:?}", p.map(|n| hex::encode(n.repr)));
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}
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println!("Filled");
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for f in all_positions[slot].witness.filled.iter() {
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println!("{:?}", hex::encode(f.repr));
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}
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println!("Cursor");
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let t = &all_positions[slot].witness.cursor;
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println!("{:?}", t.left.map(|n| hex::encode(n.repr)));
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println!("{:?}", t.right.map(|n| hex::encode(n.repr)));
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for p in t.parents.iter() {
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println!("{:?}", p.map(|n| hex::encode(n.repr)));
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}
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println!("====");
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// println!("{:?}", tree1.left.map(|n| hex::encode(n.repr)));
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// println!("{:?}", tree1.right.map(|n| hex::encode(n.repr)));
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// for p in tree1.parents.iter() {
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// println!("{:?}", p.map(|n| hex::encode(n.repr)));
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// }
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//
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// println!("Tree");
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// let t = &all_positions[slot].witness.tree;
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// println!("{:?}", t.left.map(|n| hex::encode(n.repr)));
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// println!("{:?}", t.right.map(|n| hex::encode(n.repr)));
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// for p in t.parents.iter() {
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// println!("-----");
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//
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// println!("{:?}", tree2.left.map(|n| hex::encode(n.repr)));
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// println!("{:?}", tree2.right.map(|n| hex::encode(n.repr)));
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// for p in tree2.parents.iter() {
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// println!("{:?}", p.map(|n| hex::encode(n.repr)));
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// }
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// println!("Filled");
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// for f in all_positions[slot].witness.filled.iter() {
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// println!("{:?}", hex::encode(f.repr));
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// }
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// println!("Cursor");
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// let t = &all_positions[slot].witness.cursor;
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// println!("{:?}", t.left.map(|n| hex::encode(n.repr)));
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// println!("{:?}", t.right.map(|n| hex::encode(n.repr)));
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// for p in t.parents.iter() {
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// println!("{:?}", p.map(|n| hex::encode(n.repr)));
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// }
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// println!("====");
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println!("{:?}", tree1.left.map(|n| hex::encode(n.repr)));
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println!("{:?}", tree1.right.map(|n| hex::encode(n.repr)));
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for p in tree1.parents.iter() {
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println!("{:?}", p.map(|n| hex::encode(n.repr)));
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}
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println!("-----");
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println!("{:?}", tree2.left.map(|n| hex::encode(n.repr)));
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println!("{:?}", tree2.right.map(|n| hex::encode(n.repr)));
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for p in tree2.parents.iter() {
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println!("{:?}", p.map(|n| hex::encode(n.repr)));
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}
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}
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}
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|
|
|
@ -10,6 +10,7 @@ mod chain;
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mod path;
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mod commitment;
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mod scan;
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mod builder;
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pub use crate::chain::{LWD_URL, get_latest_height, download_chain, calculate_tree_state_v2, DecryptNode};
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pub use crate::commitment::NotePosition;
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|
|
|
@ -0,0 +1,37 @@
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use zcash_primitives::merkle_tree::Hashable;
|
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use zcash_primitives::sapling::Node;
|
||||
|
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pub struct MerklePath {
|
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left: Option<Node>,
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right: Option<Node>,
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}
|
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|
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impl MerklePath {
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pub fn new(left: Option<Node>, right: Option<Node>) -> Self {
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MerklePath { left, right }
|
||||
}
|
||||
|
||||
pub fn get(&self) -> Node {
|
||||
self.left.unwrap() // shouldn't call if empty
|
||||
}
|
||||
|
||||
pub fn set(&mut self, right: Node) {
|
||||
assert!(self.left.is_some());
|
||||
self.right = Some(right);
|
||||
}
|
||||
|
||||
pub fn up(&mut self, depth: usize, parent: &Option<Node>) {
|
||||
let node = if self.left.is_some() && self.right.is_some() {
|
||||
Some(Node::combine(depth, &self.left.unwrap(), &self.right.unwrap()))
|
||||
} else {
|
||||
None
|
||||
};
|
||||
if parent.is_some() {
|
||||
self.left = *parent;
|
||||
self.right = node;
|
||||
} else {
|
||||
self.left = node;
|
||||
self.right = None;
|
||||
}
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue