Struct flate2::bufread::GzDecoder

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pub struct GzDecoder<R> { /* private fields */ }
Expand description

A decoder for a single member of a gzip file.

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

After reading a single member of the gzip data this reader will return Ok(0) even if there are more bytes available in the underlying reader. If you need the following bytes, call into_inner() after Ok(0) to recover the underlying reader.

To handle gzip files that may have multiple members, see MultiGzDecoder or read more in the introduction.

§Examples

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

// 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 = GzDecoder::new(&bytes[..]);
   let mut s = String::new();
   gz.read_to_string(&mut s)?;
   Ok(s)
}

Implementations§

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impl<R: BufRead> GzDecoder<R>

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

Creates a new decoder from the given reader, immediately parsing the gzip header.

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impl<R> GzDecoder<R>

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

Returns the header associated with this stream, if it was valid

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pub fn get_ref(&self) -> &R

Acquires a reference to the underlying reader.

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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.

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pub fn into_inner(self) -> R

Consumes this decoder, returning the underlying reader.

Trait Implementations§

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impl<R: Debug> Debug for GzDecoder<R>

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

Formats the value using the given formatter. Read more
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impl<R: BufRead> Read for GzDecoder<R>

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

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

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

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

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impl<R> !RefUnwindSafe for GzDecoder<R>

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

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

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

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impl<R> !UnwindSafe for GzDecoder<R>

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.