1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

pub mod reading {
    use crate::{BanchoMessage, PayloadReader};

    pub trait OsuRead<T> {
        fn read(reader: &mut PayloadReader) -> Option<T>;
    }

    impl OsuRead<String> for String {
        fn read(reader: &mut PayloadReader) -> Option<String> {
            if reader.payload.get(reader.index())? != &0xb {
                return None;
            }
            reader.add_index(1);
            let data_length = reader.read_uleb128()? as usize;

            let cur = reader.index;
            reader.add_index(data_length);
            let data = reader.payload.get(cur..reader.index)?;

            Some(std::str::from_utf8(data).ok()?.into())
        }
    }

    macro_rules! impl_number {
        ($($t:ty),+) => {
            $(impl OsuRead<$t> for $t {
                fn read(reader: &mut PayloadReader) -> Option<$t> {
                    Some(<$t>::from_le_bytes(
                        reader.next(std::mem::size_of::<$t>())?.try_into().ok()?,
                    ))
                }
            })+
        };
    }

    impl_number!(i8, u8, i16, u16, i32, u32, i64, u64);

    impl OsuRead<BanchoMessage> for BanchoMessage {
        fn read(reader: &mut PayloadReader) -> Option<BanchoMessage> {
            Some(BanchoMessage {
                sender: reader.read()?,
                content: reader.read()?,
                target: reader.read()?,
                sender_id: reader.read()?,
            })
        }
    }

    macro_rules! impl_number_array {
        ($($t:ty),+) => {
            $(impl OsuRead<Vec<$t>> for Vec<$t> {
                fn read(reader: &mut PayloadReader) -> Option<Vec<$t>> {
                    let length_data = reader.next(std::mem::size_of::<i16>())?;
                    let int_count = <i16>::from_le_bytes(length_data.try_into().ok()?) as usize;

                    let mut data = Vec::with_capacity(int_count);
                    for _ in 0..int_count {
                        data.push(<$t>::from_le_bytes(reader.next(4)?.try_into().ok()?));
                    }
                    Some(data)
                }
            })+
        };
    }

    impl_number_array!(i8, u8, i16, u16, i32, u32, i64, u64);
}

pub mod writing {
    use crate::write_uleb128;

    pub trait OsuWrite {
        fn osu_write(&self, buf: &mut Vec<u8>);
    }

    macro_rules! impl_number {
        ($($t:ty),+) => {
            $(impl OsuWrite for $t {
                #[inline(always)]
                fn osu_write(&self, buf: &mut Vec<u8>) {
                    buf.extend(self.to_le_bytes())
                }
            })+
        }
    }

    macro_rules! impl_number_array {
        ($($t:ty),+) => {$(impl OsuWrite for [$t] {
            #[inline(always)]
            fn osu_write(&self, buf: &mut Vec<u8>) {
                buf.extend((self.len() as u16).to_le_bytes());
                for int in self.iter() {
                    buf.extend(int.to_le_bytes())
                }
            }
        })+}
    }

    impl OsuWrite for str {
        #[inline(always)]
        fn osu_write(&self, buf: &mut Vec<u8>) {
            let byte_length = self.len();
            if byte_length > 0 {
                buf.push(0xb);
                buf.extend(write_uleb128(byte_length as u32));
                buf.extend(self.as_bytes());
            } else {
                buf.push(0);
            }
        }
    }

    impl OsuWrite for u8 {
        #[inline(always)]
        fn osu_write(&self, buf: &mut Vec<u8>) {
            buf.push(*self);
        }
    }

    impl OsuWrite for [u8] {
        #[inline(always)]
        fn osu_write(&self, buf: &mut Vec<u8>) {
            buf.extend(self);
        }
    }

    impl OsuWrite for bool {
        #[inline(always)]
        fn osu_write(&self, buf: &mut Vec<u8>) {
            buf.push(if *self { 1 } else { 0 });
        }
    }

    impl_number!(u16, i16, i32, u32, i64, u64, f32, f64);
    impl_number_array!(u16, i16, i32, u32, i64, u64, f32, f64);
}