Struct flate2::read::ZlibDecoder

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

A ZLIB decoder, or decompressor.

This structure implements a Read interface. When read from, it reads compressed data from the underlying Read and provides the uncompressed data.

After reading a single member of the ZLIB data this reader will return Ok(0) even if there are more bytes available in the underlying reader. ZlibDecoder may have read additional bytes past the end of the ZLIB data. If you need the following bytes, wrap the Reader in a std::io::BufReader and use bufread::ZlibDecoder instead.

§Examples

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

// Uncompresses a Zlib 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 z = ZlibDecoder::new(&bytes[..]);
    let mut s = String::new();
    z.read_to_string(&mut s)?;
    Ok(s)
}

Implementations§

source§

impl<R: Read> ZlibDecoder<R>

source

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

Creates a new decoder which will decompress data read from the given stream r, using buf as backing to speed up reading.

Note that the specified buffer will only be used up to its current length. The buffer’s capacity will also not grow over time.

source

pub fn new_with_decompress(r: R, decompression: Decompress) -> ZlibDecoder<R>

Creates a new decoder which will decompress data read from the given stream r, along with decompression settings.

source

pub fn new_with_decompress_and_buf( r: R, buf: Vec<u8>, decompression: Decompress, ) -> ZlibDecoder<R>

Creates a new decoder which will decompress data read from the given stream r, using buf as backing to speed up reading, along with decompression settings to configure decoder.

Note that the specified buffer will only be used up to its current length. The buffer’s capacity will also not grow over time.

source§

impl<R> ZlibDecoder<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 decoder 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 ZlibDecoder<R>

source§

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

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

impl<R: Read> Read for ZlibDecoder<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>) -> 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 Self
where 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<R: Read + Write> Write for ZlibDecoder<R>

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 Self
where Self: Sized,

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

Auto Trait Implementations§

§

impl<R> Freeze for ZlibDecoder<R>
where R: Freeze,

§

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

§

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

§

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

§

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

§

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

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,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

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

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where 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 T
where 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 T
where 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.