Initial population of solana-program-sdk

sdk/program/src/serialize_utils.rs

@@ -0,0 +1,65 @@
+use crate::pubkey::Pubkey;
+use crate::sanitize::SanitizeError;
+
+pub fn append_u16(buf: &mut Vec<u8>, data: u16) {
+    let start = buf.len();
+    buf.resize(buf.len() + 2, 0);
+    let end = buf.len();
+    buf[start..end].copy_from_slice(&data.to_le_bytes());
+}
+
+pub fn append_u8(buf: &mut Vec<u8>, data: u8) {
+    let start = buf.len();
+    buf.resize(buf.len() + 1, 0);
+    buf[start] = data;
+}
+
+pub fn append_slice(buf: &mut Vec<u8>, data: &[u8]) {
+    let start = buf.len();
+    buf.resize(buf.len() + data.len(), 0);
+    let end = buf.len();
+    buf[start..end].copy_from_slice(data);
+}
+
+pub fn read_u8(current: &mut usize, data: &[u8]) -> Result<u8, SanitizeError> {
+    if data.len() < *current + 1 {
+        return Err(SanitizeError::IndexOutOfBounds);
+    }
+    let e = data[*current];
+    *current += 1;
+    Ok(e)
+}
+
+pub fn read_pubkey(current: &mut usize, data: &[u8]) -> Result<Pubkey, SanitizeError> {
+    let len = std::mem::size_of::<Pubkey>();
+    if data.len() < *current + len {
+        return Err(SanitizeError::IndexOutOfBounds);
+    }
+    let e = Pubkey::new(&data[*current..*current + len]);
+    *current += len;
+    Ok(e)
+}
+
+pub fn read_u16(current: &mut usize, data: &[u8]) -> Result<u16, SanitizeError> {
+    if data.len() < *current + 2 {
+        return Err(SanitizeError::IndexOutOfBounds);
+    }
+    let mut fixed_data = [0u8; 2];
+    fixed_data.copy_from_slice(&data[*current..*current + 2]);
+    let e = u16::from_le_bytes(fixed_data);
+    *current += 2;
+    Ok(e)
+}
+
+pub fn read_slice(
+    current: &mut usize,
+    data: &[u8],
+    data_len: usize,
+) -> Result<Vec<u8>, SanitizeError> {
+    if data.len() < *current + data_len {
+        return Err(SanitizeError::IndexOutOfBounds);
+    }
+    let e = data[*current..*current + data_len].to_vec();
+    *current += data_len;
+    Ok(e)
+}