solana_program/
serialize_utils.rs

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

solana_program/
serialize_utils.rs
