Struct flate2::bufread::MultiGzDecoder

[+] Show declaration

pub struct MultiGzDecoder<R> { /* fields omitted */ }

[−] Expand description

A gzip streaming decoder that decodes all members of a multistream

A gzip member consists of a header, compressed data and a trailer. The gzip specification, however, allows multiple gzip members to be joined in a single stream. MultiGzDecoder will decode all consecutive members while GzDecoder will only decompress the first gzip member. The multistream format is commonly used in bioinformatics, for example when using the BGZF compressed data.

This structure exposes a BufRead interface that will consume all gzip members from the underlying reader and emit uncompressed data.

Examples

use std::io::prelude::*;
use std::io;
use flate2::bufread::MultiGzDecoder;

// Uncompresses a Gz Encoded vector of bytes and returns a string or error
// Here &[u8] implements BufRead

fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
   let mut gz = MultiGzDecoder::new(&bytes[..]);
   let mut s = String::new();
   gz.read_to_string(&mut s)?;
   Ok(s)
}

Methods

impl<R: BufRead> MultiGzDecoder<R>

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Important traits for MultiGzDecoder<R>

impl<R: BufRead> Read for MultiGzDecoder<R>impl<R: BufRead + Write> Write for MultiGzDecoder<R>

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

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Creates a new decoder from the given reader, immediately parsing the (first) gzip header. If the gzip stream contains multiple members all will be decoded.

impl<R> MultiGzDecoder<R>

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pub fn header(&self) -> Option<&GzHeader>

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Returns the current header associated with this stream, if it's valid

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_ref(&self) -> &R

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Acquires a reference to the underlying reader.

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

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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.

pub fn into_inner(self) -> R

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Consumes this decoder, returning the underlying reader.

Trait Implementations

impl<R: Debug> Debug for MultiGzDecoder<R>

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

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Formats the value using the given formatter.

impl<R: BufRead> Read for MultiGzDecoder<R>

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

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Pull some bytes from this source into the specified buffer, returning how many bytes were read.

unsafe fn initializer(&self) -> Initializer

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

Determines if this Reader can work with buffers of uninitialized memory.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

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

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

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

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

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Read the exact number of bytes required to fill buf.

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

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Creates a "by reference" adaptor for this instance of Read.

Important traits for Bytes<R>

impl<R> Iterator for Bytes<R> where
    R: Read,  type Item = Result<u8, Error>;

fn bytes(self) -> Bytes<Self>

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Transforms this Read instance to an [Iterator] over its bytes.

Important traits for Chars<R>

impl<R> Iterator for Chars<R> where
    R: Read,  type Item = Result<char, CharsError>;

fn chars(self) -> Chars<Self>

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Deprecated since 1.27.0

: Use str::from_utf8 instead: https://doc.rust-lang.org/nightly/std/str/struct.Utf8Error.html#examples

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

the semantics of a partial read/write of where errors happen is currently unclear and may change

Transforms this Read instance to an [Iterator] over [char]s.

Important traits for Chain<T, U>

impl<T, U> Read for Chain<T, U> where
    T: Read,
    U: Read, 

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

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Creates an adaptor which will chain this stream with another.

Important traits for Take<T>

impl<T> Read for Take<T> where
    T: Read, 

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

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Creates an adaptor which will read at most limit bytes from it.

impl<R: BufRead + Write> Write for MultiGzDecoder<R>

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

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Write a buffer into this object, returning how many bytes were written.

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

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

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

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Attempts to write an entire buffer into this write.

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

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

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

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Creates a "by reference" adaptor for this instance of Write.