# Struct base64::read::DecoderReader

source · [−]

    pub struct DecoderReader<'a, R: 'a + Read> { /* private fields */ }

Expand description

A `Read` implementation that decodes base64 data read from an underlying reader.

## Examples

    use std::io::Read;
    use std::io::Cursor;

    // use a cursor as the simplest possible `Read` -- in real code this is probably a file, etc.
    let mut wrapped_reader = Cursor::new(b"YXNkZg==");
    let mut decoder = base64::read::DecoderReader::new(
        &mut wrapped_reader, base64::STANDARD);

    // handle errors as you normally would
    let mut result = Vec::new();
    decoder.read_to_end(&mut result).unwrap();

    assert_eq!(b"asdf", &result[..]);

## Implementations

source

### impl<'a, R: Read> DecoderReader<'a, R>

source

#### pub fn new(r: &'a mut R, config: Config) -> Self

Create a new decoder that will read from the provided reader `r`.

## Trait Implementations

source

### impl<'a, R: Read> Debug for DecoderReader<'a, R>

source

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

Formats the value using the given formatter. Read more

source

### impl<'a, R: Read> Read for DecoderReader<'a, R>

source

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

Decode input from the wrapped reader.

Under non-error circumstances, this returns `Ok` with the value being the number of bytes written in `buf`.

Where possible, this function buffers base64 to minimize the number of read() calls to the delegate reader.

##### Errors

Any errors emitted by the delegate reader are returned. Decoding errors due to invalid base64 are also possible, and will have `io::ErrorKind::InvalidData`.

1.36.0 · source

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

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

source

#### fn is_read_vectored(&self) -> bool

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

Determines if this `Read`er has an efficient `read_vectored` implementation. Read more

1.0.0 · source

#### 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`. Read more

1.0.0 · source

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

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

1.6.0 · source

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

Read the exact number of bytes required to fill `buf`. Read more

source

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

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

Pull some bytes from this source into the specified buffer. Read more

source

#### fn read_buf_exact(&mut self, buf: &mut ReadBuf<'_>) -> Result<(), Error>

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

Read the exact number of bytes required to fill `buf`. Read more

1.0.0 · source

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

Creates a “by reference” adaptor for this instance of `Read`. Read more

1.0.0 · source

#### fn bytes(self) -> Bytes<Self>

Transforms this `Read` instance to an `Iterator` over its bytes. Read more

1.0.0 · source

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

Creates an adapter which will chain this stream with another. Read more

1.0.0 · source

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

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

## Auto Trait Implementations

### impl<'a, R> RefUnwindSafe for DecoderReader<'a, R> where
R: RefUnwindSafe,

### impl<'a, R> Send for DecoderReader<'a, R> where
R: Send,

### impl<'a, R> Sync for DecoderReader<'a, R> where
R: Sync,

### impl<'a, R> Unpin for DecoderReader<'a, R>

### impl<'a, R> !UnwindSafe for DecoderReader<'a, R>

## Blanket Implementations

source

### impl<T> Any for T where
T: 'static + ?Sized,

source

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

source

### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

### impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

source

### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

source

### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

source

### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

source

### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.