titaniumtown/YTBN-Graphing-Software
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improve hashed_storage_read

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This commit is contained in:
Simon Gardling 2022-05-20 12:37:48 -04:00
parent 4a90440f64
commit 276d1f3f20
3 changed files with 12 additions and 12 deletions
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6
src/math_app.rs
View File

@ -145,7 +145,7 @@ impl MathApp {
fn get_storage_decompressed() -> Option<Vec<u8>> {
let data = get_localstorage().get_item(DATA_NAME).ok()??;
let (commit, cached_data) = crate::misc::hashed_storage_read(data)?;
let (commit, cached_data) = crate::misc::hashed_storage_read(&data)?;
debug_assert!(!commit.is_empty());
debug_assert!(!cached_data.is_empty());
@ -183,7 +183,7 @@ impl MathApp {
return None;
}
let (commit, func_data) = crate::misc::hashed_storage_read(data)?;
let (commit, func_data) = crate::misc::hashed_storage_read(&data)?;
debug_assert!(!commit.is_empty());
debug_assert!(!func_data.is_empty());
@ -193,7 +193,7 @@ impl MathApp {
assume(!func_data.is_empty());
}
if commit == build::SHORT_COMMIT.chars().map(|c| c as u8).collect::<Vec<u8>>().as_slice() {
if commit == unsafe { std::mem::transmute::<&str, &[u8]>(build::SHORT_COMMIT) } {
tracing::info!("Reading previous function data");
let function_manager: FunctionManager = bincode::deserialize(&func_data).ok()?;
return Some(function_manager);

9
src/misc.rs
View File

@ -337,7 +337,7 @@ pub fn hashed_storage_create(hash: HashBytes, data: &[u8]) -> String {
}
#[allow(dead_code)]
pub fn hashed_storage_read(data: String) -> Option<(HashBytes, Vec<u8>)> {
pub const fn hashed_storage_read(data: &str) -> Option<(HashBytes, &[u8])> {
if HASH_LENGTH >= data.len() {
return None;
}
@ -347,12 +347,9 @@ pub fn hashed_storage_read(data: String) -> Option<(HashBytes, Vec<u8>)> {
assume(data.len() > HASH_LENGTH);
}
let decoded_1: Vec<u8> = unsafe { std::mem::transmute::<String, Vec<u8>>(data) };
let decoded_1: &[u8] = unsafe { std::mem::transmute::<&str, &[u8]>(data) };
let hash: HashBytes = unsafe { *(decoded_1[..HASH_LENGTH].as_ptr() as *const HashBytes) };
let cached_data = decoded_1[HASH_LENGTH..].to_vec();
debug_assert!(!cached_data.is_empty());
Some((hash, cached_data))
Some((hash, &decoded_1[HASH_LENGTH..]))
}

9
tests/misc.rs
View File

@ -105,14 +105,17 @@ fn hashed_storage() {
data.as_slice(),
);
let read = hashed_storage_read(storage);
assert_eq!(read.map(|(a, b)| (a.to_vec(), b)), Some((commit, data)));
let read = hashed_storage_read(&storage);
assert_eq!(
read.map(|(a, b)| (a.to_vec(), b.to_vec())),
Some((commit.to_vec(), data.to_vec()))
);
}
#[test]
fn invalid_hashed_storage() {
use ytbn_graphing_software::hashed_storage_read;
assert_eq!(hashed_storage_read("aaaa".to_owned()), None);
assert_eq!(hashed_storage_read("aaaa"), None);
}
#[test]