zrip-core 0.4.0

Shared types and codecs for zrip (internal crate)
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

#[cfg(feature = "alloc")]
use alloc::vec::Vec;

use super::HuffmanDecodeEntry;

#[inline(always)]
pub(crate) fn huf_table_lookup(table: &[HuffmanDecodeEntry], idx: usize) -> HuffmanDecodeEntry {
    debug_assert!(idx < table.len());
    unsafe { *table.get_unchecked(idx) }
}

#[inline(always)]
pub(crate) fn huf_output_write(output: &mut [u8], pos: usize, val: u8) {
    debug_assert!(pos < output.len());
    unsafe { *output.get_unchecked_mut(pos) = val }
}

#[cfg(feature = "alloc")]
#[inline(always)]
pub(crate) fn set_vec_len(vec: &mut Vec<u8>, len: usize) {
    debug_assert!(len <= vec.capacity());
    unsafe { vec.set_len(len) }
}

#[inline(always)]
pub(crate) fn get_unchecked_byte(data: &[u8], idx: usize) -> u8 {
    debug_assert!(idx < data.len());
    unsafe { *data.get_unchecked(idx) }
}

#[inline(always)]
pub(crate) fn get_unchecked_u16(data: &[u16], idx: usize) -> u16 {
    debug_assert!(idx < data.len());
    unsafe { *data.get_unchecked(idx) }
}

#[inline(always)]
pub(crate) fn get_unchecked_u8_arr(data: &[u8], idx: usize) -> u8 {
    debug_assert!(idx < data.len());
    unsafe { *data.get_unchecked(idx) }
}

#[cfg(feature = "alloc")]
#[inline(always)]
pub(crate) fn bitstream_flush_vec(buf: &mut Vec<u8>, pos: usize, bits: u64) {
    debug_assert!(pos + 8 <= buf.capacity());
    unsafe {
        (buf.as_mut_ptr().add(pos) as *mut u64).write_unaligned(bits.to_le());
    }
}