Initial commit

src/common/validator.rs

@@ -0,0 +1,54 @@
+use super::errors::ValidationError;
+
+pub(crate) fn validate_range<T, R>(
+    value: T,
+    range: R,
+    message: impl Fn() -> String,
+) -> Result<(), ValidationError>
+where
+    T: PartialOrd,
+    R: std::ops::RangeBounds<T>,
+{
+    if !range.contains(&value) {
+        return Err(ValidationError::value(message()));
+    }
+
+    Ok(())
+}
+
+pub(crate) fn validate_ascii_padded(
+    value: &[u8],
+    length: usize,
+    padding: u8,
+    field: &str,
+) -> Result<(), ValidationError> {
+    if value.len() != length {
+        return Err(ValidationError::value(format!(
+            "{} must be exactly {} bytes",
+            field, length
+        )));
+    }
+
+    for &byte in value {
+        if !((0x20..=0x7E).contains(&byte) || byte == padding) {
+            return Err(ValidationError::value(format!(
+                "Invalid ASCII character: {:#04x}",
+                byte
+            )));
+        }
+    }
+
+    Ok(())
+}
+
+pub(crate) fn validate_bitmask(
+    value: u8,
+    allowed_bits: u8,
+    message: impl Fn() -> String,
+) -> Result<(), ValidationError> {
+    if value & !allowed_bits != 0 {
+        return Err(ValidationError::value(message()));
+    }
+
+    Ok(())
+}