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Fix first byte handling

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This commit is contained in:
Luke Street 2025-10-16 17:39:45 -06:00
parent 45b071ec7f
commit 0f0eb3f63f
1 changed files with 8 additions and 6 deletions
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14
src/decompress.rs
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@ -42,21 +42,23 @@ pub fn decompress(src: &[u8], dst: &mut [u8]) -> Result<usize, Error> {
let mut lblen: usize;
let mut lbcur: usize;
let first = input_byte(src, &mut inp)?;
let mut inst = input_byte(src, &mut inp)?;
// The LZO bitstream reserves the first byte for literal priming. Codes >= 22
// copy a literal block immediately; 18..21 seed the literal countdown (`state`).
if first >= 22 {
let len = (first as usize) - 17;
if inst >= 22 {
let len = (inst as usize) - 17;
copy_slice(src, &mut inp, dst, &mut outp, len)?;
state = 4;
} else if first >= 18 {
nstate = (first as usize) - 17;
} else if inst >= 18 {
nstate = (inst as usize) - 17;
state = nstate;
copy_slice(src, &mut inp, dst, &mut outp, nstate)?;
}
loop {
let inst = input_byte(src, &mut inp)?;
if inp > 1 || state > 0 {
inst = input_byte(src, &mut inp)?;
}
if inst & 0xC0 != 0 {
// [M2]
// 1 L L D D D S S (128..255)