[Feature]: Check if a given memory area is allocated.

[jarkkojs]

Is there an existing issue for this?

• I have searched the existing issues

Description

Needed for the shim-sgx heap. Usage example:

    fn is_allocated(&self, index: usize) -> bool {
        self.is_allocated_range(index..index)
    }

    fn is_allocated_range(&self, range: core::ops::Range<usize>) -> bool {
        self.ledger.is_allocated(Region::new(
            Address::new(range.start * size_of::<Page>()),
            Address::new(range.end * size_of::<Page>()),
        ))
    }

Acceptance Criteria

No response

Suggestions for a technical implementation

No response

[jarkkojs]

not a priority, will be done internally to enarx