godot_binary_serialization/decoder/
float.rs

1use anyhow::anyhow;
2use byteorder::{ByteOrder, LittleEndian};
3
4use crate::types::{primitive::GodotFloat, SerializeFlag, TYPE_PADDING};
5
6use super::Decoder;
7
8impl Decoder {
9    /// Decodes a bytes into a Godot float
10    pub fn decode_float(bytes: &[u8], flag: &SerializeFlag) -> anyhow::Result<GodotFloat> {
11        Self::decode_raw_float(bytes, 4, flag)
12    }
13
14    /// Uses a serialization flag and the offset in bytes to decode bytes into a Godot float
15    pub fn decode_raw_float(
16        bytes: &[u8],
17        offset: usize,
18        flag: &SerializeFlag,
19    ) -> anyhow::Result<GodotFloat> {
20        let mut length = 4;
21
22        if flag == &SerializeFlag::Bit64 {
23            length = 8;
24        }
25
26        if bytes.len() < TYPE_PADDING as usize + length {
27            return Err(anyhow!(
28                "Byte slice too short to decode float with flag {flag:?}"
29            ));
30        }
31
32        if flag == &SerializeFlag::Bit64 {
33            return Ok(GodotFloat {
34                value: LittleEndian::read_f64(&bytes[offset..offset + length]),
35                byte_size: TYPE_PADDING as usize + length,
36            });
37        }
38
39        Ok(GodotFloat {
40            value: LittleEndian::read_f32(&bytes[offset..offset + length]) as f64,
41            byte_size: TYPE_PADDING as usize + length,
42        })
43    }
44}
45
46#[cfg(test)]
47mod tests {
48    use crate::decoder::Decoder;
49
50    #[test]
51    fn decode_float64() {
52        let bytes: &[u8] = &[3, 0, 1, 0, 123, 20, 174, 71, 225, 122, 228, 63];
53        let (_type, flag) = Decoder::get_type_and_flags(bytes).unwrap();
54        let float = Decoder::decode_float(bytes, &flag).unwrap();
55        let value = 0.64;
56
57        assert_eq!(
58            float.value, value,
59            "Expected value of {} but got {} instead",
60            value, float.value
61        );
62    }
63}
godot_binary_serialization/decoder/float.rs

godot_binary_serialization/decoder/
float.rs
