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/// A wrapper for the output slice used when decompressing.
///
/// Using this rather than `Cursor` lets us implement the writing methods directly on
/// the buffer and lets us use a usize rather than u64 for the position which helps with
/// performance on 32-bit systems.
pub struct OutputBuffer<'a> {
    slice: &'a mut [u8],
    position: usize,
}

impl<'a> OutputBuffer<'a> {
    #[inline]
    pub fn from_slice_and_pos(slice: &'a mut [u8], position: usize) -> OutputBuffer<'a> {
        OutputBuffer { slice, position }
    }

    #[inline]
    pub fn position(&self) -> usize {
        self.position
    }

    #[inline]
    pub fn set_position(&mut self, position: usize) {
        self.position = position;
    }

    /// Write a byte to the current position and increment
    ///
    /// Assumes that there is space.
    #[inline]
    pub fn write_byte(&mut self, byte: u8) {
        self.slice[self.position] = byte;
        self.position += 1;
    }

    /// Write a slice to the current position and increment
    ///
    /// Assumes that there is space.
    #[inline]
    pub fn write_slice(&mut self, data: &[u8]) {
        let len = data.len();
        self.slice[self.position..self.position + len].copy_from_slice(data);
        self.position += data.len();
    }

    #[inline]
    pub fn bytes_left(&self) -> usize {
        self.slice.len() - self.position
    }

    #[inline]
    pub fn get_ref(&self) -> &[u8] {
        self.slice
    }

    #[inline]
    pub fn get_mut(&mut self) -> &mut [u8] {
        self.slice
    }
}

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