[pvmfw] Define RangeExt trait on Range datatype
'is_within' of within RangeExt trait helps test if one range is
contained within another range. This will avoid duplicating the same
code in multiple places.
Test: m pvmfw_img
Bug: 271493784
Change-Id: I3fb76706620593efb45ce607eaf61d280c5a4a6c
diff --git a/pvmfw/src/helpers.rs b/pvmfw/src/helpers.rs
index 1f0a764..933a6aa 100644
--- a/pvmfw/src/helpers.rs
+++ b/pvmfw/src/helpers.rs
@@ -15,6 +15,7 @@
//! Miscellaneous helper functions.
use core::arch::asm;
+use core::ops::Range;
use zeroize::Zeroize;
pub const SIZE_4KB: usize = 4 << 10;
@@ -163,6 +164,18 @@
unsafe { core::slice::from_raw_parts(original.as_ptr().cast(), len) }
}
+/// Trait to check containment of one range within another.
+pub(crate) trait RangeExt {
+ /// Returns true if `self` is contained within the `other` range.
+ fn is_within(&self, other: &Self) -> bool;
+}
+
+impl<T: PartialOrd> RangeExt for Range<T> {
+ fn is_within(&self, other: &Self) -> bool {
+ self.start >= other.start && self.end <= other.end
+ }
+}
+
/// Create &CStr out of &str literal
#[macro_export]
macro_rules! cstr {