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fix: rust bitstream segfault #1732

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Merged
merged 1 commit into from
Aug 24, 2025
Merged

fix: rust bitstream segfault #1732

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32 changes: 8 additions & 24 deletions src/rust/src/libccxr_exports/bitstream.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,18 +13,6 @@ unsafe fn copy_bitstream_from_rust_to_c(
bitstream_ptr: *mut bitstream,
rust_bitstream: &BitStreamRust,
) {
// Handle empty slice case
if rust_bitstream.data.is_empty() {
(*bitstream_ptr).pos = std::ptr::null_mut();
(*bitstream_ptr).bpos = 8;
(*bitstream_ptr).end = std::ptr::null_mut();
(*bitstream_ptr).bitsleft = 0;
(*bitstream_ptr).error = c_int::from(rust_bitstream.error);
(*bitstream_ptr)._i_pos = std::ptr::null_mut();
(*bitstream_ptr)._i_bpos = 0;
return;
}

// Get the original pos (which is the base of our slice)
let base_ptr = rust_bitstream.data.as_ptr() as *mut c_uchar;
let end_ptr = base_ptr.add(rust_bitstream.data.len());
Expand Down Expand Up @@ -63,19 +51,15 @@ unsafe fn copy_bitstream_c_to_rust(value: *mut bitstream) -> BitStreamRust<'stat
// Calculate total buffer length from pos to end
let total_len = (*value).end.offset_from((*value).pos) as usize;

if total_len > 0 {
// Create slice from current position to end
slice = std::slice::from_raw_parts((*value).pos, total_len);
// Current position in this slice is 0 (since slice starts from current pos)
current_pos_in_slice = 0;
// Create slice from current position to end, zero-length slices are also valid
slice = std::slice::from_raw_parts((*value).pos, total_len);
// Current position in this slice is 0 (since slice starts from current pos)
current_pos_in_slice = 0;

// Calculate _i_pos relative to the slice start (which is current pos)
if !(*value)._i_pos.is_null() {
let i_offset = (*value)._i_pos.offset_from((*value).pos);
i_pos_in_slice = i_offset.max(0) as usize;
}
} else if (*value).pos == (*value).end {
slice = std::slice::from_raw_parts((*value).pos, 1);
// Calculate _i_pos relative to the slice start (which is current pos)
if !(*value)._i_pos.is_null() {
let i_offset = (*value)._i_pos.offset_from((*value).pos);
i_pos_in_slice = i_offset.max(0) as usize;
}
}

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