Struct self_encryption::SelfEncryptor
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[src]
pub struct SelfEncryptor<S>(_);
This is the encryption object and all file handling should be done using this object as the low level mechanism to read and write content. This library has no knowledge of file metadata.
Methods
impl<S> SelfEncryptor<S> where
S: Storage + 'static, [src]
S: Storage + 'static,
fn new(
storage: S,
data_map: DataMap
) -> Result<SelfEncryptor<S>, SelfEncryptionError<S::Error>>
storage: S,
data_map: DataMap
) -> Result<SelfEncryptor<S>, SelfEncryptionError<S::Error>>
This is the only constructor for an encryptor object. Each SelfEncryptor is used for a
single file. The parameters are a Storage object and a DataMap. For a file which has
not previously been self-encrypted, use DataMap::None.
fn write(
&self,
data: &[u8],
position: u64
) -> Box<Future<Item = (), Error = SelfEncryptionError<S::Error>>>
&self,
data: &[u8],
position: u64
) -> Box<Future<Item = (), Error = SelfEncryptionError<S::Error>>>
Write method mirrors a POSIX type write mechanism. It loosely mimics a filesystem interface
for easy connection to FUSE-like programs as well as fine grained access to system level
libraries for developers. The input data will be written from the specified position
(starts from 0).
fn read(
&self,
position: u64,
length: u64
) -> Box<Future<Item = Vec<u8>, Error = SelfEncryptionError<S::Error>>>
&self,
position: u64,
length: u64
) -> Box<Future<Item = Vec<u8>, Error = SelfEncryptionError<S::Error>>>
The returned content is read from the specified position with specified length. Trying
to read beyond the file size will cause the encryptor to return content filled with 0u8s
in the gap (file size isn't affected). Any other unwritten gaps will also be filled with
'0u8's.
fn close(
self
) -> Box<Future<Item = (DataMap, S), Error = SelfEncryptionError<S::Error>>>
self
) -> Box<Future<Item = (DataMap, S), Error = SelfEncryptionError<S::Error>>>
This function returns a DataMap, which is the info required to recover encrypted content
from data storage location. Content temporarily held in the encryptor will only get flushed
into storage when this function gets called.
fn truncate(
&self,
new_size: u64
) -> Box<Future<Item = (), Error = SelfEncryptionError<S::Error>>>
&self,
new_size: u64
) -> Box<Future<Item = (), Error = SelfEncryptionError<S::Error>>>
Truncate the self_encryptor to the specified size (if extended, filled with 0u8s).
fn len(&self) -> u64
Current file size as is known by encryptor.
fn is_empty(&self) -> bool
Returns true if file size as is known by encryptor == 0.
fn into_storage(self) -> S
Consume this encryptor and return its storage.