godot_binary_serialization/decoder/
string.rs

1use anyhow::anyhow;
2use byteorder::{ByteOrder, LittleEndian};
3
4use crate::types::primitive::GodotString;
5
6use super::Decoder;
7
8impl Decoder {
9    /// Decodes bytes into a Godot string. This will fail if the bytes do not match Godot's
10    /// serialization rules
11    pub fn decode_string(bytes: &[u8]) -> anyhow::Result<GodotString> {
12        if bytes.len() < 8 {
13            return Err(anyhow!("Not enough bytes for a string"));
14        }
15
16        let length = LittleEndian::read_u32(&bytes[4..8]) as usize;
17        // Pad 4 bytes because godot
18        let pad = (4 - (length % 4)) % 4;
19
20        let total_length = 8 + length + pad;
21        if bytes.len() < total_length {
22            return Err(anyhow!("Amount of bytes does not match string length"));
23        }
24
25        let string = String::from_utf8(bytes[8..8 + length].to_vec())?;
26
27        Ok(GodotString {
28            value: string,
29            byte_size: total_length,
30        })
31    }
32}
33
34#[cfg(test)]
35mod tests {
36    use crate::decoder::Decoder;
37
38    #[test]
39    fn decode_string() {
40        let bytes: &[u8] = &[
41            4, 0, 0, 0, 10, 0, 0, 0, 98, 97, 110, 97, 110, 97, 66, 108, 111, 120, 0, 0,
42        ];
43        let (_type, _flag) = Decoder::get_type_and_flags(bytes).unwrap();
44        let string = Decoder::decode_string(bytes).unwrap();
45        let value = "bananaBlox";
46
47        assert_eq!(
48            string.value, value,
49            "Expected value of {} but got {} instead",
50            value, string.value
51        )
52    }
53}
godot_binary_serialization/decoder/string.rs

godot_binary_serialization/decoder/
string.rs
