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change entropy coder from Range to rANS

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This commit is contained in:
Dennis Ranke
2021-11-22 23:14:24 +01:00
parent 479a2e2c89
commit 470b778340
8 changed files with 155 additions and 126 deletions
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10
src/lz.rs
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@@ -1,9 +1,9 @@
use crate::context_state::ContextState;
use crate::range_coder::{RangeCoder, RangeDecoder};
use crate::rans::{RansCoder, RansDecoder};
pub struct LzCoder {
contexts: ContextState,
range_coder: RangeCoder,
range_coder: RansCoder,
last_offset: usize,
}
@@ -11,7 +11,7 @@ impl LzCoder {
pub fn new() -> LzCoder {
LzCoder {
contexts: ContextState::new(1 + 255 + 1 + 64 + 64),
range_coder: RangeCoder::new(),
range_coder: RansCoder::new(),
last_offset: 0,
}
}
@@ -68,13 +68,13 @@ impl LzCoder {
}
pub fn unpack(packed_data: &[u8]) -> Vec<u8> {
let mut decoder = RangeDecoder::new(packed_data);
let mut decoder = RansDecoder::new(packed_data);
let mut contexts = ContextState::new(1 + 255 + 1 + 64 + 64);
let mut result = vec![];
let mut offset = 0;
fn decode_length(
decoder: &mut RangeDecoder,
decoder: &mut RansDecoder,
contexts: &mut ContextState,
mut context_index: usize,
) -> usize {