rust: Fix Unity loading

The deku::byte_offset trick we do for alignment requires reader.bits_read to be correct, as that's the number we pad by. In our PackedVec implementations, we read a u8, and then later skip over it, which double-counts from the perspective of reader.bits_read. Fix this by adjusting after we read it.

rust/src/unity/types/common.rs

@@ -226,6 +226,7 @@ impl<'a, Ctx> DekuReader<'a, Ctx> for Packedi32Vec where Ctx: Clone {
         reader.seek(SeekFrom::Current(byte_array_count as i64)).unwrap();
         let bit_size: u8 = u8::from_reader_with_ctx(reader, ())?;
         reader.seek(SeekFrom::Current(-(byte_array_count as i64) - 1)).unwrap();
+        reader.bits_read -= 8;
         let data = unpack_i32s(reader, num_items as usize, bit_size as usize)?;
         reader.skip_bits(4 * 8)?; // bit_size, padding
 
@@ -255,6 +256,7 @@ impl<'a, Ctx> DekuReader<'a, Ctx> for Packedf32Vec where Ctx: Clone {
         reader.seek(SeekFrom::Current(byte_array_count as i64)).unwrap();
         let bit_size = u8::from_reader_with_ctx(reader, ())?;
         reader.seek(SeekFrom::Current(-(byte_array_count as i64) - 1)).unwrap();
+        reader.bits_read -= 8;
 
         let max = ((1 << bit_size) as f32) - 1.0;
         let ints = unpack_i32s(reader, num_items as usize, bit_size as usize)?;

rust/src/unity/util.rs

@@ -5,7 +5,7 @@ pub fn deku_peek<'a, T, R: deku::no_std_io::Read + deku::no_std_io::Seek>(reader
     where for<'b> T: DekuReader<'b, ()> + Debug
 {
     println!("deku_peek - {}", msg);
-    println!("  offset: {}", reader.bits_read);
+    println!("  offset: {} / {}", reader.bits_read >> 3, reader.bits_read);
     match T::from_reader_with_ctx(reader, ()) {
         Ok(value) => {
             println!("  value: {:?}", value);