Struct flate2::read::DeflateDecoder

source ·
pub struct DeflateDecoder<R> { /* private fields */ }
Expand description

A DEFLATE decoder, or decompressor.

This structure implements a Read interface and takes a stream of compressed data as input, providing the decompressed data when read from.

Examples

use std::io::prelude::*;
use std::io;
use flate2::read::DeflateDecoder;

// Uncompresses a Deflate Encoded vector of bytes and returns a string or error
// Here &[u8] implements Read
fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
   let mut deflater = DeflateDecoder::new(&bytes[..]);
   let mut s = String::new();
   deflater.read_to_string(&mut s)?;
   Ok(s)
}

Implementations§

source§

impl<R: Read> DeflateDecoder<R>

source

pub fn new(r: R) -> DeflateDecoder<R>

Creates a new decoder which will decompress data read from the given stream.

source

pub fn new_with_buf(r: R, buf: Vec<u8>) -> DeflateDecoder<R>

Same as new, but the intermediate buffer for data is specified.

Note that the capacity of the intermediate buffer is never increased, and it is recommended for it to be large.

source§

impl<R> DeflateDecoder<R>

source

pub fn reset(&mut self, r: R) -> R

Resets the state of this decoder entirely, swapping out the input stream for another.

This will reset the internal state of this decoder and replace the input stream with the one provided, returning the previous input stream. Future data read from this decoder will be the decompressed version of r’s data.

Note that there may be currently buffered data when this function is called, and in that case the buffered data is discarded.

source

pub fn get_ref(&self) -> &R

Acquires a reference to the underlying stream

source

pub fn get_mut(&mut self) -> &mut R

Acquires a mutable reference to the underlying stream

Note that mutation of the stream may result in surprising results if this encoder is continued to be used.

source

pub fn into_inner(self) -> R

Consumes this decoder, returning the underlying reader.

Note that there may be buffered bytes which are not re-acquired as part of this transition. It’s recommended to only call this function after EOF has been reached.

source

pub fn total_in(&self) -> u64

Returns the number of bytes that the decompressor has consumed.

Note that this will likely be smaller than what the decompressor actually read from the underlying stream due to buffering.

source

pub fn total_out(&self) -> u64

Returns the number of bytes that the decompressor has produced.

Trait Implementations§

source§

impl<R: Debug> Debug for DeflateDecoder<R>

source§

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

Formats the value using the given formatter. Read more
source§

impl<R: Read> Read for DeflateDecoder<R>

source§

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more
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 Reader 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: BorrowedCursor<'_>) -> 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, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)
Read the exact number of bytes required to fill cursor. Read more
1.0.0 · source§

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

Creates a “by reference” adaptor for this instance of Read. Read more
1.0.0 · source§

fn bytes(self) -> Bytes<Self>where Self: Sized,

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, Self: Sized,

Creates an adapter which will chain this stream with another. Read more
1.0.0 · source§

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

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

impl<W: Read + Write> Write for DeflateDecoder<W>

source§

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

Write a buffer into this writer, returning how many bytes were written. Read more
source§

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

Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
1.36.0 · source§

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

Like write, except that it writes from a slice of buffers. Read more
source§

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. Read more
1.0.0 · source§

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

Attempts to write an entire buffer into this writer. Read more
source§

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. Read more
1.0.0 · source§

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

Writes a formatted string into this writer, returning any error encountered. Read more
1.0.0 · source§

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

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

Auto Trait Implementations§

§

impl<R> RefUnwindSafe for DeflateDecoder<R>where R: RefUnwindSafe,

§

impl<R> Send for DeflateDecoder<R>where R: Send,

§

impl<R> Sync for DeflateDecoder<R>where R: Sync,

§

impl<R> Unpin for DeflateDecoder<R>where R: Unpin,

§

impl<R> UnwindSafe for DeflateDecoder<R>where R: UnwindSafe,

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> FlateReadExt for Twhere T: Read,

source§

fn gz_encode(self, lvl: Compression) -> GzEncoder<Self>

Consume this reader to create a compression stream at the specified compression level.
source§

fn gz_decode(self) -> Result<GzDecoder<Self>>

Consume this reader to create a decompression stream of this stream.
source§

fn zlib_encode(self, lvl: Compression) -> ZlibEncoder<Self>

Consume this reader to create a compression stream at the specified compression level.
source§

fn zlib_decode(self) -> ZlibDecoder<Self>

Consume this reader to create a decompression stream of this stream.
source§

fn deflate_encode(self, lvl: Compression) -> DeflateEncoder<Self>

Consume this reader to create a compression stream at the specified compression level.
source§

fn deflate_decode(self) -> DeflateDecoder<Self>

Consume this reader to create a decompression stream of this stream.
source§

impl<T> FlateWriteExt for Twhere T: Write,

source§

fn gz_encode(self, lvl: Compression) -> GzEncoder<Self>

Consume this writer to create a compression stream at the specified compression level.
source§

fn zlib_encode(self, lvl: Compression) -> ZlibEncoder<Self>

Consume this writer to create a compression stream at the specified compression level.
source§

fn zlib_decode(self) -> ZlibDecoder<Self>

Consume this writer to create a decompression stream of this stream.
source§

fn deflate_encode(self, lvl: Compression) -> DeflateEncoder<Self>

Consume this writer to create a compression stream at the specified compression level.
source§

fn deflate_decode(self) -> DeflateDecoder<Self>

Consume this writer to create a decompression stream of this stream.
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere U: From<T>,

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 Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

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

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.