Enum CompressReserveBehavior

pub enum CompressReserveBehavior {
    NewBuf,
    ExpandBuf(Vec<u8>),
    FixedSizeBuf(Vec<u8>),
}

Available on crate feature stream only.

How to allocate the buffer in CompressedStream::compress().

Variants

NewBuf

Allocate a new buffer of the appropriate size.

ExpandBuf(Vec<u8>)

Re-use the given buffer, but expand its size by reallocating if needed.

FixedSizeBuf(Vec<u8>)

Re-use the given buffer, and raise an error if reallocation is necessary.

Implementations

impl CompressReserveBehavior

pub fn current_buf(&mut self) -> Option<&mut Vec<u8>>

Get a mutable reference to the existing buffer contents, if available.

The contents can be moved out of the resulting mutable vector with e.g. mem::take():

 use vectorscan::stream::CompressReserveBehavior;
 use std::mem;

 let mut buf = CompressReserveBehavior::NewBuf;
 assert!(buf.current_buf().is_none());
 buf = CompressReserveBehavior::FixedSizeBuf(vec![0; 32]);
 let b = mem::take(buf.current_buf().unwrap());
 assert_eq!(buf.current_buf(), Some(&mut vec![]));
 assert_eq!(b, vec![0; 32]);