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make packer usable as lib

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This commit is contained in:
Dennis Ranke
2021-11-20 16:27:35 +01:00
parent 8f23ec711f
commit 479a2e2c89
5 changed files with 30 additions and 16 deletions
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14
src/lz.rs
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@@ -53,7 +53,7 @@ impl LzCoder {
assert!(value >= 1);
let top_bit = usize::BITS - 1 - value.leading_zeros();
let mut context_index = context_start;
for i in (0..top_bit).rev() {
for i in 0..top_bit {
self.bit(true, context_index);
self.bit((value >> i) & 1 != 0, context_index + 1);
context_index += 2;
@@ -78,14 +78,16 @@ pub fn unpack(packed_data: &[u8]) -> Vec<u8> {
contexts: &mut ContextState,
mut context_index: usize,
) -> usize {
let mut length = 1;
let mut length = 0;
let mut bit_pos = 0;
while decoder.decode_with_context(&mut contexts.context_mut(context_index)) {
length = (length << 1)
| decoder.decode_with_context(&mut contexts.context_mut(context_index + 1))
as usize;
length |= (decoder.decode_with_context(&mut contexts.context_mut(context_index + 1))
as usize)
<< bit_pos;
bit_pos += 1;
context_index += 2;
}
length
length | (1 << bit_pos)
}
loop {