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use rotary_core::Channel; use rotary_core::ReadBuf; use rotary_core::{Buf, ExactSizeBuf}; /// Make a buffer into a read adapter that implements [ReadBuf]. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _, WriteBuf as _}; /// use rotary::io; /// /// let from = rotary::interleaved![[1.0f32, 2.0f32, 3.0f32, 4.0f32]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// let mut to = io::ReadWrite::new(to); /// /// io::copy_remaining(io::Read::new((&from).skip(2).limit(1)), &mut to); /// io::copy_remaining(io::Read::new((&from).limit(1)), &mut to); /// /// assert_eq! { /// to.as_ref().as_slice(), /// &[3.0, 3.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0], /// }; /// ``` pub struct Read<B> { buf: B, available: usize, } impl<B> Read<B> where B: ExactSizeBuf, { /// Construct a new read adapter. pub fn new(buf: B) -> Self { let available = buf.frames(); Self { buf, available } } /// Access the underlying buffer. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, WriteBuf as _}; /// use rotary::{io, wrap}; /// /// let buffer: rotary::Interleaved<i16> = rotary::interleaved![[1, 2, 3, 4]; 4]; /// let mut buffer = io::Read::new(buffer); /// /// io::copy_remaining(&mut buffer, wrap::interleaved(&mut [0i16; 16][..], 4)); /// /// assert_eq!(buffer.as_ref().channels(), 4); /// ``` pub fn as_ref(&self) -> &B { &self.buf } /// Access the underlying buffer mutably. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, WriteBuf as _, ExactSizeBuf as _}; /// use rotary::{io, wrap}; /// /// let buffer: rotary::Interleaved<i16> = rotary::interleaved![[1, 2, 3, 4]; 4]; /// let mut buffer = io::Read::new(buffer); /// /// io::copy_remaining(&mut buffer, wrap::interleaved(&mut [0i16; 16][..], 4)); /// /// buffer.as_mut().resize_channels(2); /// /// assert_eq!(buffer.channels(), 2); /// ``` pub fn as_mut(&mut self) -> &mut B { &mut self.buf } /// Convert into the underlying buffer. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, WriteBuf as _}; /// use rotary::{io, wrap}; /// /// let buffer: rotary::Interleaved<i16> = rotary::interleaved![[1, 2, 3, 4]; 4]; /// let mut buffer = io::Read::new(buffer); /// /// io::copy_remaining(&mut buffer, wrap::interleaved(&mut [0i16; 16][..], 4)); /// /// let buffer = buffer.into_inner(); /// /// assert_eq!(buffer.channels(), 4); /// ``` pub fn into_inner(self) -> B { self.buf } } impl<B> ReadBuf for Read<B> { fn remaining(&self) -> usize { self.available } fn advance(&mut self, n: usize) { self.available = self.available.saturating_sub(n); } } impl<B> ExactSizeBuf for Read<B> where B: ExactSizeBuf, { fn frames(&self) -> usize { self.buf.frames() } } impl<B, T> Buf<T> for Read<B> where B: Buf<T>, { fn frames_hint(&self) -> Option<usize> { self.buf.frames_hint() } fn channels(&self) -> usize { self.buf.channels() } fn channel(&self, channel: usize) -> Channel<'_, T> { self.buf.channel(channel).tail(self.available) } }