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add option to disable repeated offsets

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This commit is contained in:
Dennis Ranke
2022-09-25 16:23:11 +02:00
parent 12e6f95fe8
commit 331857a711
4 changed files with 11 additions and 5 deletions
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9
src/lz.rs
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@@ -25,7 +25,7 @@ impl Op {
}
&Op::Match { offset, len } => {
encode_bit(coder, state, literal_base, config.is_match_bit);
if !state.prev_was_match {
if !state.prev_was_match && !config.no_repeated_offsets {
encode_bit(
coder,
state,
@@ -33,9 +33,9 @@ impl Op {
(offset != state.last_offset) == config.new_offset_bit,
);
} else {
assert!(offset != state.last_offset);
assert!(offset != state.last_offset || config.no_repeated_offsets);
}
if offset != state.last_offset {
if offset != state.last_offset || config.no_repeated_offsets {
encode_length(
coder,
state,
@@ -156,7 +156,8 @@ pub fn unpack(packed_data: &[u8], config: Config) -> Vec<u8> {
if decoder.decode_with_context(&mut contexts.context_mut(literal_base))
== config.is_match_bit
{
if prev_was_match
if config.no_repeated_offsets
|| prev_was_match
|| decoder
.decode_with_context(&mut contexts.context_mut(256 * config.parity_contexts))
== config.new_offset_bit