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Remove unused code

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This commit is contained in:
Paul Hauner 2019-03-27 17:46:12 +11:00
parent 35ceb92f2e
commit ad4000cbdf
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1 changed files with 0 additions and 236 deletions
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236
eth2/utils/ssz/src/cached_tree_hash.rs
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@ -173,19 +173,6 @@ mod tests {
all
}
/*
#[test]
fn container() {
let data1 = hash(&vec![1; 32]);
let data2 = hash(&vec![2; 32]);
let data3 = hash(&vec![3; 32]);
let data4 = hash(&vec![4; 32]);
let data = join(vec![&data1, &data2, &data3, &data4]);
let cache = cache_builder(&data).unwrap();
}
*/
#[test]
fn merkleize_4_leaves() {
let data1 = hash(&int_to_bytes32(1));
@ -232,226 +219,3 @@ mod tests {
}
}
}
/*
/// Get merkle root of some hashed values - the input leaf nodes is expected to already be hashed
/// Outputs a `Vec<u8>` byte array of the merkle root given a set of leaf node values.
pub fn cache_builder(values: &[u8]) -> Option<Vec<u8>> {
let leaves = values.len() / HASHSIZE;
if leaves == 0 || !leaves.is_power_of_two() {
return None;
}
let mut o: Vec<u8> = vec![0; (num_nodes(leaves) - leaves) * HASHSIZE];
o.append(&mut values.to_vec());
let mut i = o.len();
let mut j = o.len() - values.len();
while i >= MERKLE_HASH_CHUNCK {
i -= MERKLE_HASH_CHUNCK;
let hash = hash(&o[i..i + MERKLE_HASH_CHUNCK]);
j -= HASHSIZE;
o.get_mut(j..j + HASHSIZE)?.copy_from_slice(&hash);
}
return Some(o);
}
fn parent(child: usize) -> usize {
(child - 1) / 2
}
fn children(parent: usize) -> (usize, usize) {
((2 * parent + 1), (2 * parent + 2))
}
fn num_nodes(num_leaves: usize) -> usize {
2 * num_leaves - 1
}
pub struct Outer {
pub a: u64,
pub b: u64,
pub inner: Inner,
}
#[cfg(test)]
mod tests {
use super::*;
fn join(many: Vec<&[u8]>) -> Vec<u8> {
let mut all = vec![];
for one in many {
all.extend_from_slice(&mut one.clone())
}
all
}
/*
#[test]
fn container() {
let data1 = hash(&vec![1; 32]);
let data2 = hash(&vec![2; 32]);
let data3 = hash(&vec![3; 32]);
let data4 = hash(&vec![4; 32]);
let data = join(vec![&data1, &data2, &data3, &data4]);
let cache = cache_builder(&data).unwrap();
}
*/
#[test]
fn can_build_cache() {
let data1 = hash(&vec![1; 32]);
let data2 = hash(&vec![2; 32]);
let data3 = hash(&vec![3; 32]);
let data4 = hash(&vec![4; 32]);
let data = join(vec![&data1, &data2, &data3, &data4]);
let cache = cache_builder(&data).unwrap();
let hash_12 = {
let mut joined = vec![];
joined.append(&mut data1.clone());
joined.append(&mut data2.clone());
hash(&joined)
};
let hash_34 = {
let mut joined = vec![];
joined.append(&mut data3.clone());
joined.append(&mut data4.clone());
hash(&joined)
};
let hash_hash12_hash_34 = {
let mut joined = vec![];
joined.append(&mut hash_12.clone());
joined.append(&mut hash_34.clone());
hash(&joined)
};
for (i, chunk) in cache.chunks(HASHSIZE).enumerate().rev() {
let expected = match i {
0 => hash_hash12_hash_34.clone(),
1 => hash_12.clone(),
2 => hash_34.clone(),
3 => data1.clone(),
4 => data2.clone(),
5 => data3.clone(),
6 => data4.clone(),
_ => vec![],
};
assert_eq!(chunk, &expected[..], "failed at {}", i);
}
}
}
/*
pub trait TreeHash {
fn hash_tree_root(&self) -> Vec<u8>;
}
/// Returns a 32 byte hash of 'list' - a vector of byte vectors.
/// Note that this will consume 'list'.
pub fn merkle_hash(list: &mut Vec<Vec<u8>>) -> Vec<u8> {
// flatten list
let mut chunkz = list_to_blob(list);
// get data_len as bytes. It will hashed will the merkle root
let mut datalen = list.len().to_le_bytes().to_vec();
zpad(&mut datalen, 32);
// merklelize
while chunkz.len() > HASHSIZE {
let mut new_chunkz: Vec<u8> = Vec::new();
for two_chunks in chunkz.chunks(BYTES_PER_CHUNK * 2) {
// Hash two chuncks together
new_chunkz.append(&mut hash(two_chunks));
}
chunkz = new_chunkz;
}
chunkz.append(&mut datalen);
hash(&chunkz)
}
fn list_to_blob(list: &mut Vec<Vec<u8>>) -> Vec<u8> {
// pack - fit as many many items per chunk as we can and then
// right pad to BYTES_PER_CHUNCK
let (items_per_chunk, chunk_count) = if list.is_empty() {
(1, 1)
} else {
let items_per_chunk = BYTES_PER_CHUNK / list[0].len();
let chunk_count = list.len() / items_per_chunk;
(items_per_chunk, chunk_count)
};
let mut chunkz = Vec::new();
if list.is_empty() {
// handle and empty list
chunkz.append(&mut vec![0; BYTES_PER_CHUNK * 2]);
} else if list[0].len() <= BYTES_PER_CHUNK {
// just create a blob here; we'll divide into
// chunked slices when we merklize
let mut chunk = Vec::with_capacity(BYTES_PER_CHUNK);
let mut item_count_in_chunk = 0;
chunkz.reserve(chunk_count * BYTES_PER_CHUNK);
for item in list.iter_mut() {
item_count_in_chunk += 1;
chunk.append(item);
// completed chunk?
if item_count_in_chunk == items_per_chunk {
zpad(&mut chunk, BYTES_PER_CHUNK);
chunkz.append(&mut chunk);
item_count_in_chunk = 0;
}
}
// left-over uncompleted chunk?
if item_count_in_chunk != 0 {
zpad(&mut chunk, BYTES_PER_CHUNK);
chunkz.append(&mut chunk);
}
}
// extend the number of chunks to a power of two if necessary
if !chunk_count.is_power_of_two() {
let zero_chunks_count = chunk_count.next_power_of_two() - chunk_count;
chunkz.append(&mut vec![0; zero_chunks_count * BYTES_PER_CHUNK]);
}
chunkz
}
/// right pads with zeros making 'bytes' 'size' in length
fn zpad(bytes: &mut Vec<u8>, size: usize) {
if bytes.len() < size {
bytes.resize(size, 0);
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_merkle_hash() {
let data1 = vec![1; 32];
let data2 = vec![2; 32];
let data3 = vec![3; 32];
let mut list = vec![data1, data2, data3];
let result = merkle_hash(&mut list);
//note: should test againt a known test hash value
assert_eq!(HASHSIZE, result.len());
}
}
*/
*/