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optimize byte_read for aligned reads

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Robin Appelman 2019-03-16 16:52:44 +01:00
commit da62bb9e9d
1 changed files with 6 additions and 26 deletions
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32
src/buffer.rs
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@ -325,6 +325,11 @@ impl<E> BitBuffer<E>
} }
} }
if position & 7 == 0 {
let byte_pos = position / 8;
return Ok(self.bytes[byte_pos..byte_pos + byte_count].to_vec());
}
let mut data = Vec::with_capacity(byte_count); let mut data = Vec::with_capacity(byte_count);
let mut byte_left = byte_count; let mut byte_left = byte_count;
let max_read = size_of::<usize>() - 1; let max_read = size_of::<usize>() - 1;
@ -502,32 +507,7 @@ impl<E> BitBuffer<E>
} }
} }
/// Get a clone of the buffer with a shorter length pub(crate) fn get_sub_buffer(&self, bit_len: usize) -> Result<Self> {
///
/// # Errors
///
/// - [`ReadError::NotEnoughData`]: if the requested length is higher than the buffer length
///
/// # Examples
///
/// ```
/// # use bitstream_reader::{BitBuffer, LittleEndian, Result};
/// #
/// # fn main() -> Result<()> {
/// # let bytes = vec![
/// # 0b1011_0101, 0b0110_1010, 0b1010_1100, 0b1001_1001,
/// # 0b1001_1001, 0b1001_1001, 0b1001_1001, 0b1110_0111
/// # ];
/// # let buffer = BitBuffer::new(bytes, LittleEndian);
/// let sub = buffer.get_sub_buffer(16)?;
/// let result: u8 = sub.read_int(0, 6)?;
/// #
/// # Ok(())
/// # }
/// ```
///
/// [`ReadError::NotEnoughData`]: enum.ReadError.html#variant.NotEnoughData
pub fn get_sub_buffer(&self, bit_len: usize) -> Result<Self> {
if bit_len > self.bit_len { if bit_len > self.bit_len {
return Err(ReadError::NotEnoughData { return Err(ReadError::NotEnoughData {
requested: bit_len, requested: bit_len,