vendor/flate2-1.0.22/src/gz/read.rs - toolchain/rustc - Git at Google

 use std::io;
 use std::io::prelude::*;

 #[cfg(feature = "tokio")]
 use futures::Poll;
 #[cfg(feature = "tokio")]
 use tokio_io::{AsyncRead, AsyncWrite};

 use super::bufread;
 use super::{GzBuilder, GzHeader};
 use crate::bufreader::BufReader;
 use crate::Compression;

 /// A gzip streaming encoder
 ///
 /// This structure exposes a [`Read`] interface that will read uncompressed data
 /// from the underlying reader and expose the compressed version as a [`Read`]
 /// interface.
 ///
 /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
 ///
 /// # Examples
 ///
 /// ```
 /// use std::io::prelude::*;
 /// use std::io;
 /// use flate2::Compression;
 /// use flate2::read::GzEncoder;
 ///
 /// // Return a vector containing the GZ compressed version of hello world
 ///
 /// fn gzencode_hello_world() -> io::Result<Vec<u8>> {
 ///     let mut ret_vec = [0;100];
 ///     let bytestring = b"hello world";
 ///     let mut gz = GzEncoder::new(&bytestring[..], Compression::fast());
 ///     let count = gz.read(&mut ret_vec)?;
 ///     Ok(ret_vec[0..count].to_vec())
 /// }
 /// ```
 #[derive(Debug)]
 pub struct GzEncoder<R> {
     inner: bufread::GzEncoder<BufReader<R>>,
 }

 pub fn gz_encoder<R: Read>(inner: bufread::GzEncoder<BufReader<R>>) -> GzEncoder<R> {
     GzEncoder { inner: inner }
 }

 impl<R: Read> GzEncoder<R> {
     /// Creates a new encoder which will use the given compression level.
     ///
     /// The encoder is not configured specially for the emitted header. For
     /// header configuration, see the `GzBuilder` type.
     ///
     /// The data read from the stream `r` will be compressed and available
     /// through the returned reader.
     pub fn new(r: R, level: Compression) -> GzEncoder<R> {
         GzBuilder::new().read(r, level)
     }
 }

 impl<R> GzEncoder<R> {
     /// Acquires a reference to the underlying reader.
     pub fn get_ref(&self) -> &R {
         self.inner.get_ref().get_ref()
     }

     /// Acquires a mutable reference to the underlying reader.
     ///
     /// Note that mutation of the reader may result in surprising results if
     /// this encoder is continued to be used.
     pub fn get_mut(&mut self) -> &mut R {
         self.inner.get_mut().get_mut()
     }

     /// Returns the underlying stream, consuming this encoder
     pub fn into_inner(self) -> R {
         self.inner.into_inner().into_inner()
     }
 }

 impl<R: Read> Read for GzEncoder<R> {
     fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
         self.inner.read(into)
     }
 }

 impl<R: Read + Write> Write for GzEncoder<R> {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.get_mut().write(buf)
     }

     fn flush(&mut self) -> io::Result<()> {
         self.get_mut().flush()
     }
 }

 /// A gzip streaming decoder
 ///
 /// This structure exposes a [`Read`] interface that will consume compressed
 /// data from the underlying reader and emit uncompressed data.
 ///
 /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
 ///
 /// # Examples
 ///
 /// ```
 ///
 /// use std::io::prelude::*;
 /// use std::io;
 /// # use flate2::Compression;
 /// # use flate2::write::GzEncoder;
 /// use flate2::read::GzDecoder;
 ///
 /// # fn main() {
 /// #    let mut e = GzEncoder::new(Vec::new(), Compression::default());
 /// #    e.write_all(b"Hello World").unwrap();
 /// #    let bytes = e.finish().unwrap();
 /// #    println!("{}", decode_reader(bytes).unwrap());
 /// # }
 /// #
 /// // Uncompresses a Gz 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 gz = GzDecoder::new(&bytes[..]);
 ///    let mut s = String::new();
 ///    gz.read_to_string(&mut s)?;
 ///    Ok(s)
 /// }
 /// ```
 #[derive(Debug)]
 pub struct GzDecoder<R> {
     inner: bufread::GzDecoder<BufReader<R>>,
 }

 impl<R: Read> GzDecoder<R> {
     /// Creates a new decoder from the given reader, immediately parsing the
     /// gzip header.
     pub fn new(r: R) -> GzDecoder<R> {
         GzDecoder {
             inner: bufread::GzDecoder::new(BufReader::new(r)),
         }
     }
 }

 impl<R> GzDecoder<R> {
     /// Returns the header associated with this stream, if it was valid.
     pub fn header(&self) -> Option<&GzHeader> {
         self.inner.header()
     }

     /// Acquires a reference to the underlying reader.
     pub fn get_ref(&self) -> &R {
         self.inner.get_ref().get_ref()
     }

     /// 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 get_mut(&mut self) -> &mut R {
         self.inner.get_mut().get_mut()
     }

     /// Consumes this decoder, returning the underlying reader.
     pub fn into_inner(self) -> R {
         self.inner.into_inner().into_inner()
     }
 }

 impl<R: Read> Read for GzDecoder<R> {
     fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
         self.inner.read(into)
     }
 }

 #[cfg(feature = "tokio")]
 impl<R: AsyncRead> AsyncRead for GzDecoder<R> {}

 impl<R: Read + Write> Write for GzDecoder<R> {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.get_mut().write(buf)
     }

     fn flush(&mut self) -> io::Result<()> {
         self.get_mut().flush()
     }
 }

 #[cfg(feature = "tokio")]
 impl<R: AsyncWrite + AsyncRead> AsyncWrite for GzDecoder<R> {
     fn shutdown(&mut self) -> Poll<(), io::Error> {
         self.get_mut().shutdown()
     }
 }

 /// 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](https://tools.ietf.org/html/rfc1952), 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 [`Read`] interface that will consume all gzip members
 /// from the underlying reader and emit uncompressed data.
 ///
 /// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
 ///
 /// # Examples
 ///
 /// ```
 /// use std::io::prelude::*;
 /// use std::io;
 /// # use flate2::Compression;
 /// # use flate2::write::GzEncoder;
 /// use flate2::read::MultiGzDecoder;
 ///
 /// # fn main() {
 /// #    let mut e = GzEncoder::new(Vec::new(), Compression::default());
 /// #    e.write_all(b"Hello World").unwrap();
 /// #    let bytes = e.finish().unwrap();
 /// #    println!("{}", decode_reader(bytes).unwrap());
 /// # }
 /// #
 /// // Uncompresses a Gz 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 gz = MultiGzDecoder::new(&bytes[..]);
 ///    let mut s = String::new();
 ///    gz.read_to_string(&mut s)?;
 ///    Ok(s)
 /// }
 /// ```
 #[derive(Debug)]
 pub struct MultiGzDecoder<R> {
     inner: bufread::MultiGzDecoder<BufReader<R>>,
 }

 impl<R: Read> MultiGzDecoder<R> {
     /// 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.
     pub fn new(r: R) -> MultiGzDecoder<R> {
         MultiGzDecoder {
             inner: bufread::MultiGzDecoder::new(BufReader::new(r)),
         }
     }
 }

 impl<R> MultiGzDecoder<R> {
     /// Returns the current header associated with this stream, if it's valid.
     pub fn header(&self) -> Option<&GzHeader> {
         self.inner.header()
     }

     /// Acquires a reference to the underlying reader.
     pub fn get_ref(&self) -> &R {
         self.inner.get_ref().get_ref()
     }

     /// 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 get_mut(&mut self) -> &mut R {
         self.inner.get_mut().get_mut()
     }

     /// Consumes this decoder, returning the underlying reader.
     pub fn into_inner(self) -> R {
         self.inner.into_inner().into_inner()
     }
 }

 impl<R: Read> Read for MultiGzDecoder<R> {
     fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
         self.inner.read(into)
     }
 }

 #[cfg(feature = "tokio")]
 impl<R: AsyncRead> AsyncRead for MultiGzDecoder<R> {}

 impl<R: Read + Write> Write for MultiGzDecoder<R> {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.get_mut().write(buf)
     }

     fn flush(&mut self) -> io::Result<()> {
         self.get_mut().flush()
     }
 }

 #[cfg(feature = "tokio")]
 impl<R: AsyncWrite + AsyncRead> AsyncWrite for MultiGzDecoder<R> {
     fn shutdown(&mut self) -> Poll<(), io::Error> {
         self.get_mut().shutdown()
     }
 }
	use std::io;
	use std::io::prelude::*;

	#[cfg(feature = "tokio")]
	use futures::Poll;
	#[cfg(feature = "tokio")]
	use tokio_io::{AsyncRead, AsyncWrite};

	use super::bufread;
	use super::{GzBuilder, GzHeader};
	use crate::bufreader::BufReader;
	use crate::Compression;

	/// A gzip streaming encoder
	///
	/// This structure exposes a [`Read`] interface that will read uncompressed data
	/// from the underlying reader and expose the compressed version as a [`Read`]
	/// interface.
	///
	/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
	///
	/// # Examples
	///
	/// ```
	/// use std::io::prelude::*;
	/// use std::io;
	/// use flate2::Compression;
	/// use flate2::read::GzEncoder;
	///
	/// // Return a vector containing the GZ compressed version of hello world
	///
	/// fn gzencode_hello_world() -> io::Result<Vec<u8>> {
	/// let mut ret_vec = [0;100];
	/// let bytestring = b"hello world";
	/// let mut gz = GzEncoder::new(&bytestring[..], Compression::fast());
	/// let count = gz.read(&mut ret_vec)?;
	/// Ok(ret_vec[0..count].to_vec())
	/// }
	/// ```
	#[derive(Debug)]
	pub struct GzEncoder<R> {
	inner: bufread::GzEncoder<BufReader<R>>,
	}

	pub fn gz_encoder<R: Read>(inner: bufread::GzEncoder<BufReader<R>>) -> GzEncoder<R> {
	GzEncoder { inner: inner }
	}

	impl<R: Read> GzEncoder<R> {
	/// Creates a new encoder which will use the given compression level.
	///
	/// The encoder is not configured specially for the emitted header. For
	/// header configuration, see the `GzBuilder` type.
	///
	/// The data read from the stream `r` will be compressed and available
	/// through the returned reader.
	pub fn new(r: R, level: Compression) -> GzEncoder<R> {
	GzBuilder::new().read(r, level)
	}
	}

	impl<R> GzEncoder<R> {
	/// Acquires a reference to the underlying reader.
	pub fn get_ref(&self) -> &R {
	self.inner.get_ref().get_ref()
	}

	/// Acquires a mutable reference to the underlying reader.
	///
	/// Note that mutation of the reader may result in surprising results if
	/// this encoder is continued to be used.
	pub fn get_mut(&mut self) -> &mut R {
	self.inner.get_mut().get_mut()
	}

	/// Returns the underlying stream, consuming this encoder
	pub fn into_inner(self) -> R {
	self.inner.into_inner().into_inner()
	}
	}

	impl<R: Read> Read for GzEncoder<R> {
	fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
	self.inner.read(into)
	}
	}

	impl<R: Read + Write> Write for GzEncoder<R> {
	fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
	self.get_mut().write(buf)
	}

	fn flush(&mut self) -> io::Result<()> {
	self.get_mut().flush()
	}
	}

	/// A gzip streaming decoder
	///
	/// This structure exposes a [`Read`] interface that will consume compressed
	/// data from the underlying reader and emit uncompressed data.
	///
	/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
	///
	/// # Examples
	///
	/// ```
	///
	/// use std::io::prelude::*;
	/// use std::io;
	/// # use flate2::Compression;
	/// # use flate2::write::GzEncoder;
	/// use flate2::read::GzDecoder;
	///
	/// # fn main() {
	/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
	/// # e.write_all(b"Hello World").unwrap();
	/// # let bytes = e.finish().unwrap();
	/// # println!("{}", decode_reader(bytes).unwrap());
	/// # }
	/// #
	/// // Uncompresses a Gz 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 gz = GzDecoder::new(&bytes[..]);
	/// let mut s = String::new();
	/// gz.read_to_string(&mut s)?;
	/// Ok(s)
	/// }
	/// ```
	#[derive(Debug)]
	pub struct GzDecoder<R> {
	inner: bufread::GzDecoder<BufReader<R>>,
	}

	impl<R: Read> GzDecoder<R> {
	/// Creates a new decoder from the given reader, immediately parsing the
	/// gzip header.
	pub fn new(r: R) -> GzDecoder<R> {
	GzDecoder {
	inner: bufread::GzDecoder::new(BufReader::new(r)),
	}
	}
	}

	impl<R> GzDecoder<R> {
	/// Returns the header associated with this stream, if it was valid.
	pub fn header(&self) -> Option<&GzHeader> {
	self.inner.header()
	}

	/// Acquires a reference to the underlying reader.
	pub fn get_ref(&self) -> &R {
	self.inner.get_ref().get_ref()
	}

	/// 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 get_mut(&mut self) -> &mut R {
	self.inner.get_mut().get_mut()
	}

	/// Consumes this decoder, returning the underlying reader.
	pub fn into_inner(self) -> R {
	self.inner.into_inner().into_inner()
	}
	}

	impl<R: Read> Read for GzDecoder<R> {
	fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
	self.inner.read(into)
	}
	}

	#[cfg(feature = "tokio")]
	impl<R: AsyncRead> AsyncRead for GzDecoder<R> {}

	impl<R: Read + Write> Write for GzDecoder<R> {
	fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
	self.get_mut().write(buf)
	}

	fn flush(&mut self) -> io::Result<()> {
	self.get_mut().flush()
	}
	}

	#[cfg(feature = "tokio")]
	impl<R: AsyncWrite + AsyncRead> AsyncWrite for GzDecoder<R> {
	fn shutdown(&mut self) -> Poll<(), io::Error> {
	self.get_mut().shutdown()
	}
	}

	/// 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](https://tools.ietf.org/html/rfc1952), 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 [`Read`] interface that will consume all gzip members
	/// from the underlying reader and emit uncompressed data.
	///
	/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
	///
	/// # Examples
	///
	/// ```
	/// use std::io::prelude::*;
	/// use std::io;
	/// # use flate2::Compression;
	/// # use flate2::write::GzEncoder;
	/// use flate2::read::MultiGzDecoder;
	///
	/// # fn main() {
	/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
	/// # e.write_all(b"Hello World").unwrap();
	/// # let bytes = e.finish().unwrap();
	/// # println!("{}", decode_reader(bytes).unwrap());
	/// # }
	/// #
	/// // Uncompresses a Gz 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 gz = MultiGzDecoder::new(&bytes[..]);
	/// let mut s = String::new();
	/// gz.read_to_string(&mut s)?;
	/// Ok(s)
	/// }
	/// ```
	#[derive(Debug)]
	pub struct MultiGzDecoder<R> {
	inner: bufread::MultiGzDecoder<BufReader<R>>,
	}

	impl<R: Read> MultiGzDecoder<R> {
	/// 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.
	pub fn new(r: R) -> MultiGzDecoder<R> {
	MultiGzDecoder {
	inner: bufread::MultiGzDecoder::new(BufReader::new(r)),
	}
	}
	}

	impl<R> MultiGzDecoder<R> {
	/// Returns the current header associated with this stream, if it's valid.
	pub fn header(&self) -> Option<&GzHeader> {
	self.inner.header()
	}

	/// Acquires a reference to the underlying reader.
	pub fn get_ref(&self) -> &R {
	self.inner.get_ref().get_ref()
	}

	/// 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 get_mut(&mut self) -> &mut R {
	self.inner.get_mut().get_mut()
	}

	/// Consumes this decoder, returning the underlying reader.
	pub fn into_inner(self) -> R {
	self.inner.into_inner().into_inner()
	}
	}

	impl<R: Read> Read for MultiGzDecoder<R> {
	fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
	self.inner.read(into)
	}
	}

	#[cfg(feature = "tokio")]
	impl<R: AsyncRead> AsyncRead for MultiGzDecoder<R> {}

	impl<R: Read + Write> Write for MultiGzDecoder<R> {
	fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
	self.get_mut().write(buf)
	}

	fn flush(&mut self) -> io::Result<()> {
	self.get_mut().flush()
	}
	}

	#[cfg(feature = "tokio")]
	impl<R: AsyncWrite + AsyncRead> AsyncWrite for MultiGzDecoder<R> {
	fn shutdown(&mut self) -> Poll<(), io::Error> {
	self.get_mut().shutdown()
	}
	}