Struct spectrusty_formats::tap::TapChunkWriteTran

pub struct TapChunkWriteTran<'a, W: Write + Seek> {
    pub checksum: u8,
    /* private fields */
}

A TapChunkWriter transaction holder. Created by TapChunkWriter::begin.

Write data with its Write implementation methods. Then call TapChunkWriteTran::commit.

Fields

checksum: u8

Checksum byte updated with each write.

Implementations

impl<'a, W> TapChunkWriteTran<'a, W>where
    W: Write + Seek,

pub fn commit(self, with_checksum: bool) -> Result<usize>

Commits a TAP chunk.

If with_checksum is true additionally writes a checksum byte of data written so far.

Returns number of TAP chunks written including the call to begin.

Examples found in repository

src/mdr.rs (line 781)

    fn file_to_tap_writer<S: AsRef<[u8]>, W: Write + Seek>(
            &self,
            file_name: S,
            wr: &mut TapChunkWriter<W>
        ) -> io::Result<bool>
    {
        let mut sector_iter = self.file_sectors(file_name);
        #[allow(clippy::never_loop)]
        let mut tran = loop {
            if let Some(sector) = sector_iter.next() {
                let sector = sector.unwrap();
                if let Some(header) = sector.tap_header()
                                      .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?
                {
                    wr.write_header(&header)?;
                    let mut tran = wr.begin()?;
                    tran.write_all(slice::from_ref(&DATA_BLOCK_FLAG))?;
                    tran.write_all(&sector.data_record()[HD_SIZE..])?;
                    break tran
                }
            }
            return Ok(false)
        };
        for sector in sector_iter {
            let sector = sector.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
            let record = sector.data_record();
            tran.write_all(record)?;
        }
        tran.commit(true)?;
        Ok(true)
    }

Trait Implementations

impl<'a, W: Write + Seek> Drop for TapChunkWriteTran<'a, W>

fn drop(&mut self)

Rollbacks if uncommitted. In this instance moves the cursor back to where it was before the transaction has started.

impl<'a, W: Write + Seek> Write for TapChunkWriteTran<'a, W>

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

Appends data to the current chunk.

Any number of writes should be followed by TapChunkWriteTran::commit.

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

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

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

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

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, fmt: Arguments<'_>) -> Result<(), Error>

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

fn by_ref(&mut self) -> &mut Selfwhere
    Self: Sized,

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