fn fill_from_file()

in src/enclave_proc/resource_manager.rs [278:311]

• 30 lines of code
• 3 McCabe index (conditional complexity)

    fn fill_from_file(
        &self,
        file: &mut File,
        region_offset: usize,
        size: usize,
    ) -> NitroCliResult<()> {
        let offset_plus_size = region_offset.checked_add(size).ok_or_else(|| {
            new_nitro_cli_failure!(
                "Memory overflow when writing EIF file to region",
                NitroCliErrorEnum::MemoryOverflow
            )
        })?;

        if offset_plus_size > self.mem_size as usize {
            return Err(new_nitro_cli_failure!(
                "Out of region",
                NitroCliErrorEnum::MemoryOverflow
            ));
        }

        let bytes = unsafe {
            std::slice::from_raw_parts_mut(self.mem_addr as *mut u8, self.mem_size as usize)
        };

        file.read_exact(&mut bytes[region_offset..region_offset + size])
            .map_err(|e| {
                new_nitro_cli_failure!(
                    &format!("Error while reading from enclave image: {:?}", e),
                    NitroCliErrorEnum::EifParsingError
                )
            })?;

        Ok(())
    }