68 lines
1.8 KiB
Rust
68 lines
1.8 KiB
Rust
//! Helpers for reading and writing bytes.
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#![allow(clippy::integer_arithmetic)]
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use crate::{pubkey::Pubkey, sanitize::SanitizeError};
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pub fn append_u16(buf: &mut Vec<u8>, data: u16) {
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let start = buf.len();
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buf.resize(buf.len() + 2, 0);
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let end = buf.len();
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buf[start..end].copy_from_slice(&data.to_le_bytes());
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}
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pub fn append_u8(buf: &mut Vec<u8>, data: u8) {
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let start = buf.len();
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buf.resize(buf.len() + 1, 0);
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buf[start] = data;
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}
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pub fn append_slice(buf: &mut Vec<u8>, data: &[u8]) {
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let start = buf.len();
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buf.resize(buf.len() + data.len(), 0);
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let end = buf.len();
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buf[start..end].copy_from_slice(data);
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}
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pub fn read_u8(current: &mut usize, data: &[u8]) -> Result<u8, SanitizeError> {
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if data.len() < *current + 1 {
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return Err(SanitizeError::IndexOutOfBounds);
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}
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let e = data[*current];
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*current += 1;
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Ok(e)
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}
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pub fn read_pubkey(current: &mut usize, data: &[u8]) -> Result<Pubkey, SanitizeError> {
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let len = std::mem::size_of::<Pubkey>();
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if data.len() < *current + len {
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return Err(SanitizeError::IndexOutOfBounds);
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}
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let e = Pubkey::new(&data[*current..*current + len]);
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*current += len;
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Ok(e)
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}
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pub fn read_u16(current: &mut usize, data: &[u8]) -> Result<u16, SanitizeError> {
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if data.len() < *current + 2 {
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return Err(SanitizeError::IndexOutOfBounds);
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}
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let mut fixed_data = [0u8; 2];
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fixed_data.copy_from_slice(&data[*current..*current + 2]);
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let e = u16::from_le_bytes(fixed_data);
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*current += 2;
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Ok(e)
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}
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pub fn read_slice(
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current: &mut usize,
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data: &[u8],
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data_len: usize,
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) -> Result<Vec<u8>, SanitizeError> {
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if data.len() < *current + data_len {
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return Err(SanitizeError::IndexOutOfBounds);
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}
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let e = data[*current..*current + data_len].to_vec();
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*current += data_len;
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Ok(e)
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}
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