Struct BlockTemporaryFile 

pub struct BlockTemporaryFile<const BYTES: usize> { /* private fields */ }

A private temporary byte file with a compile-time logical block width of 1 through 16,384 bytes. Each physical block reserves two authenticated ciphertext slots and a one-byte active selector: 1 + 2 * (24 + 2 + 16 + BYTES) bytes. Only the populated prefix is encrypted; its two-byte length and block position are authenticated. An incomplete replacement never overwrites the active slot. Only ciphertext and its public framing reach disk; each file has a fresh random key which exists solely in this owner. Reopened handles share the owner but have independent logical positions. The last handle removes the file. Abrupt process death may leave an encrypted file whose key was never persisted; this is not a durable recovery or anti-replay format.

Implementations

impl<const BYTES: usize> BlockTemporaryFile<BYTES>

pub fn physical_len_for(logical_length: u64) -> Result<u64>

Ciphertext file length for a logical length, including both slots and complete block framing. This excludes filesystem allocation metadata.

pub fn new() -> Result<Self>

pub fn new_in(directory: impl AsRef<Path>) -> Result<Self>

pub fn path(&self) -> &Path

pub fn as_file(&self) -> &Self

pub fn as_file_mut(&mut self) -> &mut Self

pub fn write_all_vectored(&mut self, input: &mut [IoSlice<'_>]) -> Result<()>

Write the complete concatenation of the slices, sharing one authenticated block publication across adjacent fields. Like Write::write_all, an error can leave a written prefix; record owners retain responsibility for rolling back incomplete records.

pub fn reopen(&self) -> Result<Self>

pub fn metadata(&self) -> Result<TemporaryFileMetadata>

pub fn set_len(&self, length: u64) -> Result<()>

Trait Implementations

impl<const BYTES: usize> Read for BlockTemporaryFile<BYTES>

fn read(&mut self, output: &mut [u8]) -> Result<usize>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Reads all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Reads all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Reads the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_, u8>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_buf_exact( &mut self, cursor: BorrowedCursor<'_, u8>, ) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Reads the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Read.

fn bytes(self) -> Bytes<Self>

where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

where Self: Sized,

Creates an adapter which will read at most limit bytes from it.

fn read_array<const N: usize>(&mut self) -> Result<[u8; N], Error>

where Self: Sized,

🔬This is a nightly-only experimental API. (read_array)

Read and return a fixed array of bytes from this source.

fn read_le<T>(&mut self) -> Result<T, Error>

where T: FromEndianBytes, Self: Sized,

🔬This is a nightly-only experimental API. (read_le)

Read and return a type (e.g. an integer) in little-endian order.

fn read_be<T>(&mut self) -> Result<T, Error>

where T: FromEndianBytes, Self: Sized,

🔬This is a nightly-only experimental API. (read_le)

Read and return a type (e.g. an integer) in big-endian order.

impl<const BYTES: usize> Seek for BlockTemporaryFile<BYTES>

fn seek(&mut self, position: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

🔬This is a nightly-only experimental API. (seek_stream_len)

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

fn seek_relative(&mut self, offset: i64) -> Result<(), Error>

Seeks relative to the current position.

impl<const BYTES: usize> Write for BlockTemporaryFile<BYTES>

fn write(&mut self, input: &[u8]) -> Result<usize>

Writes a buffer into this writer, returning how many bytes were written.

fn write_vectored(&mut self, input: &[IoSlice<'_>]) -> Result<usize>

Like write, except that it writes from a slice of buffers.

fn flush(&mut self) -> Result<()>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.