atlas_serialize_utils/
lib.rs

1//! Helpers for reading and writing bytes.
2
3#![cfg_attr(docsrs, feature(doc_cfg))]
4#![allow(clippy::arithmetic_side_effects)]
5use {atlas_pubkey::Pubkey, atlas_sanitize::SanitizeError};
6
7pub mod cursor;
8
9pub fn append_u16(buf: &mut Vec<u8>, data: u16) {
10    let start = buf.len();
11    buf.resize(buf.len() + 2, 0);
12    let end = buf.len();
13    buf[start..end].copy_from_slice(&data.to_le_bytes());
14}
15
16pub fn append_u8(buf: &mut Vec<u8>, data: u8) {
17    let start = buf.len();
18    buf.resize(buf.len() + 1, 0);
19    buf[start] = data;
20}
21
22pub fn append_slice(buf: &mut Vec<u8>, data: &[u8]) {
23    let start = buf.len();
24    buf.resize(buf.len() + data.len(), 0);
25    let end = buf.len();
26    buf[start..end].copy_from_slice(data);
27}
28
29pub fn read_u8(current: &mut usize, data: &[u8]) -> Result<u8, SanitizeError> {
30    if data.len() < *current + 1 {
31        return Err(SanitizeError::IndexOutOfBounds);
32    }
33    let e = data[*current];
34    *current += 1;
35    Ok(e)
36}
37
38pub fn read_pubkey(current: &mut usize, data: &[u8]) -> Result<Pubkey, SanitizeError> {
39    let len = std::mem::size_of::<Pubkey>();
40    if data.len() < *current + len {
41        return Err(SanitizeError::IndexOutOfBounds);
42    }
43    let e = Pubkey::try_from(&data[*current..*current + len])
44        .map_err(|_| SanitizeError::ValueOutOfBounds)?;
45    *current += len;
46    Ok(e)
47}
48
49pub fn read_u16(current: &mut usize, data: &[u8]) -> Result<u16, SanitizeError> {
50    if data.len() < *current + 2 {
51        return Err(SanitizeError::IndexOutOfBounds);
52    }
53    let mut fixed_data = [0u8; 2];
54    fixed_data.copy_from_slice(&data[*current..*current + 2]);
55    let e = u16::from_le_bytes(fixed_data);
56    *current += 2;
57    Ok(e)
58}
59
60pub fn read_slice(
61    current: &mut usize,
62    data: &[u8],
63    data_len: usize,
64) -> Result<Vec<u8>, SanitizeError> {
65    if data.len() < *current + data_len {
66        return Err(SanitizeError::IndexOutOfBounds);
67    }
68    let e = data[*current..*current + data_len].to_vec();
69    *current += data_len;
70    Ok(e)
71}
atlas_serialize_utils/lib.rs

atlas_serialize_utils/
lib.rs
