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-rw-r--r--src/device/storage.rs42
1 files changed, 41 insertions, 1 deletions
diff --git a/src/device/storage.rs b/src/device/storage.rs
index 08ec4e9..a2c598b 100644
--- a/src/device/storage.rs
+++ b/src/device/storage.rs
@@ -1,7 +1,8 @@
-// Copyright (C) 2019-2019 Robin Krahl <robin.krahl@ireas.org>
+// Copyright (C) 2019-2020 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: MIT
use std::fmt;
+use std::ops;
use nitrokey_sys;
@@ -635,6 +636,45 @@ impl<'a> Storage<'a> {
})
}
+ /// Returns a range of the SD card that has not been used to during this power cycle.
+ ///
+ /// The Nitrokey Storage tracks read and write access to the SD card during a power cycle.
+ /// This method returns a range of the SD card that has not been accessed during this power
+ /// cycle. The range is relative to the total size of the SD card, so both values are less
+ /// than or equal to 100. This can be used as a guideline when creating a hidden volume.
+ ///
+ /// # Example
+ ///
+ /// ```no_run
+ /// let mut manager = nitrokey::take()?;
+ /// let storage = manager.connect_storage()?;
+ /// let usage = storage.get_sd_card_usage()?;
+ /// println!("SD card usage: {}..{}", usage.start, usage.end);
+ /// # Ok::<(), nitrokey::Error>(())
+ /// ```
+ pub fn get_sd_card_usage(&self) -> Result<ops::Range<u8>, Error> {
+ let mut usage_data = nitrokey_sys::NK_SD_usage_data {
+ write_level_min: 0,
+ write_level_max: 0,
+ };
+ let result = unsafe { nitrokey_sys::NK_get_SD_usage_data(&mut usage_data) };
+ match get_command_result(result) {
+ Ok(_) => {
+ if usage_data.write_level_min > usage_data.write_level_max
+ || usage_data.write_level_max > 100
+ {
+ Err(Error::UnexpectedError)
+ } else {
+ Ok(ops::Range {
+ start: usage_data.write_level_min,
+ end: usage_data.write_level_max,
+ })
+ }
+ }
+ Err(err) => Err(err),
+ }
+ }
+
/// Blinks the red and green LED alternatively and infinitely until the device is reconnected.
pub fn wink(&mut self) -> Result<(), Error> {
get_command_result(unsafe { nitrokey_sys::NK_wink() })