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added byte boundry case to push_bits

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This commit is contained in:
Nicolas FOURNIER 2020-03-20 08:44:25 +01:00
commit 57dcdbe9a0
1 changed files with 7 additions and 3 deletions
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10
src/writestream.rs
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@ -98,15 +98,19 @@ where
debug_assert!(count < USIZE_BITS - 8);
let bit_offset = self.bit_len & 7;
let last_written_byte = self.bytes.pop().unwrap_or(0);
let merge_byte = if bit_offset == 0 {
0
} else {
self.bytes.pop().unwrap_or(0)
};
let merged_byte_count = (count + bit_offset + 7) / 8;
if E::is_le() {
let merged = last_written_byte as usize | bits << bit_offset;
let merged = merge_byte as usize | bits << bit_offset;
self.bytes
.extend_from_slice(&merged.to_le_bytes()[0..merged_byte_count]);
} else {
let merged = ((last_written_byte as usize) << (USIZE_BITS - 8))
let merged = ((merge_byte as usize) << (USIZE_BITS - 8))
| bits << (USIZE_BITS - bit_offset - count);
self.bytes
.extend_from_slice(&merged.to_be_bytes()[0..merged_byte_count]);