Struct qiniu_upload_manager::DataSourceReader

pub struct DataSourceReader { /* private fields */ }

数据源阅读器

提供阻塞读取接口

Implementations

impl DataSourceReader

pub fn seekable(part_number: NonZeroUsize, source: SeekableSource) -> Self

创建可寻址的数据源阅读器

Examples found in repository

src/data_source/seekable.rs (lines 45-48)

    fn slice(&self, size: PartSize) -> IoResult<Option<DataSourceReader>> {
        let mut cur = self.current.lock().unwrap();
        if cur.offset < self.size {
            let size = size.as_u64();
            let source_reader = DataSourceReader::seekable(
                cur.part_number,
                self.source.clone_with_new_offset_and_length(cur.offset, size),
            );
            cur.offset += size;
            cur.part_number = NonZeroUsize::new(cur.part_number.get() + 1).expect("Page number is too big");
            Ok(Some(source_reader))
        } else {
            Ok(None)
        }
    }

pub fn unseekable(part_number: NonZeroUsize, data: Vec<u8>, offset: u64) -> Self

创建不可寻址的数据源阅读器

Examples found in repository

src/data_source/unseekable.rs (line 57)

    fn slice(&self, size: PartSize) -> IoResult<Option<DataSourceReader>> {
        let mut buf = Vec::new();
        let guard = &mut self.0.lock().unwrap();
        let have_read = (&mut guard.reader).take(size.as_u64()).read_to_end(&mut buf)?;
        if have_read > 0 {
            let source_reader = DataSourceReader::unseekable(guard.current_part_number, buf, guard.current_offset);
            guard.current_offset += have_read as u64;
            guard.current_part_number =
                NonZeroUsize::new(guard.current_part_number.get() + 1).expect("Page number is too big");
            Ok(Some(source_reader))
        } else {
            Ok(None)
        }
    }

Trait Implementations

impl Debug for DataSourceReader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Read for DataSourceReader

fn read(&mut self, buf: &mut [u8]) -> IoResult<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, Global>) -> Result<usize, Error>

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

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

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

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

Read the exact number of bytes required to fill buf.

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

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

Read the exact number of bytes required to fill cursor.

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

Creates a “by reference” adaptor 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.

impl Reset for DataSourceReader

fn reset(&mut self) -> IoResult<()>

重置输入流