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Implement enumerated trie root throughout.

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This commit is contained in:
Gav
2018-01-30 22:40:03 +01:00
parent 69a73f3480
commit e19100e76a
11 changed files with 74 additions and 10 deletions
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substrate/wasm-runtime/std/src/lib.rs
+16
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@@ -43,6 +43,7 @@ extern "C" {
fn ext_get_allocated_storage(key_data: *const u8, key_len: u32, written_out: *mut u32) -> *mut u8;
fn ext_get_storage_into(key_data: *const u8, key_len: u32, value_data: *mut u8, value_len: u32, value_offset: u32) -> u32;
fn ext_storage_root(result: *mut u8);
fn ext_enumerated_trie_root(values_data: *const u8, values_len: u32, lens_data: *const u32, lens_len: u32, result: *mut u8);
fn ext_chain_id() -> u64;
fn ext_blake2_256(data: *const u8, len: u32, out: *mut u8);
fn ext_twox_128(data: *const u8, len: u32, out: *mut u8);
@@ -82,6 +83,21 @@ pub fn storage_root() -> [u8; 32] {
result
}
/// A trie root calculated from enumerated values.
pub fn enumerated_trie_root(values: &[&[u8]]) -> [u8; 32] {
let lens = values.iter().map(|v| (v.len() as u32).to_le()).collect::<Vec<_>>();
let values = values.iter().fold(Vec::new(), |mut acc, sl| { acc.extend_from_slice(sl); acc });
let mut result: [u8; 32] = Default::default();
unsafe {
ext_enumerated_trie_root(
values.as_ptr(), values.len() as u32,
lens.as_ptr(), lens.len() as u32,
result.as_mut_ptr()
);
}
result
}
/// The current relay chain identifier.
pub fn chain_id() -> u64 {
unsafe {