dem 0.2.3

GoldSrc demo parser and writer library
Documentation 
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use crate::types::OriginCoord;

use super::*;

impl Doer for SvcSound {
    fn id(&self) -> u8 {
        6
    }

    fn parse(i: &[u8], _: AuxRefCell) -> Result<Self> {
        let mut br = BitReader::new(i);

        let flags = br.read_n_bit(9).to_owned();
        let flag_u = flags.to_u32();
        let volume = if flag_u & 1 != 0 {
            Some(br.read_n_bit(8).to_owned())
        } else {
            None
        };
        let attenuation = if flag_u & 2 != 0 {
            Some(br.read_n_bit(8).to_owned())
        } else {
            None
        };
        let channel = br.read_n_bit(3).to_owned();
        let entity_index = br.read_n_bit(11).to_owned();
        let (sound_index_long, sound_index_short) = if flag_u & 4 != 0 {
            (Some(br.read_n_bit(16).to_owned()), None)
        } else {
            (None, Some(br.read_n_bit(8).to_owned()))
        };
        let (has_x, has_y, has_z) = (br.read_1_bit(), br.read_1_bit(), br.read_1_bit());
        let origin_x = if has_x {
            Some(parse_origin(&mut br))
        } else {
            None
        };
        let origin_y = if has_y {
            Some(parse_origin(&mut br))
        } else {
            None
        };
        let origin_z = if has_z {
            Some(parse_origin(&mut br))
        } else {
            None
        };
        let pitch = if flag_u & 8 != 0 {
            br.read_n_bit(8).to_owned()
        } else {
            BitVec::from_element(1u8)
        };

        let (i, _) = take(br.get_consumed_bytes())(i)?;

        Ok((
            i,
            Self {
                flags,
                volume,
                attenuation,
                channel,
                entity_index,
                sound_index_long,
                sound_index_short,
                has_x,
                has_y,
                has_z,
                origin_x,
                origin_y,
                origin_z,
                pitch,
            },
        ))
    }

    fn write(&self, _: AuxRefCell) -> ByteVec {
        let mut writer = ByteWriter::new();

        writer.append_u8(self.id());

        let mut bw = BitWriter::new();

        let should_write_volume = self.flags.to_u16() & 1 != 0;
        let should_write_attenuation = self.flags.to_u16() & 2 != 0;
        let should_write_sound_index_long = self.flags.to_u16() & 4 != 0;
        let should_write_pitch = self.flags.to_u16() & 8 != 0;

        bw.append_vec(&self.flags);

        if should_write_volume {
            bw.append_vec(self.volume.as_ref().unwrap());
        }

        if should_write_attenuation {
            bw.append_vec(self.attenuation.as_ref().unwrap());
        }

        bw.append_vec(&self.channel);
        bw.append_vec(&self.entity_index);

        if should_write_sound_index_long {
            bw.append_vec(self.sound_index_long.as_ref().unwrap())
        } else {
            bw.append_vec(self.sound_index_short.as_ref().unwrap())
        }

        bw.append_bit(self.has_x);
        bw.append_bit(self.has_y);
        bw.append_bit(self.has_z);

        if self.has_x {
            write_origin(self.origin_x.as_ref().unwrap(), &mut bw);
        }
        if self.has_y {
            write_origin(self.origin_y.as_ref().unwrap(), &mut bw);
        }
        if self.has_z {
            write_origin(self.origin_z.as_ref().unwrap(), &mut bw);
        }

        if should_write_pitch {
            bw.append_vec(&self.pitch);
        }

        writer.append_u8_slice(bw.get_u8_vec().as_slice());

        writer.data
    }
}

fn parse_origin(br: &mut BitReader) -> OriginCoord {
    let int_flag = br.read_1_bit();
    let fraction_flag = br.read_1_bit();

    let is_negative = if int_flag || fraction_flag {
        Some(br.read_1_bit())
    } else {
        None
    };

    let int_value = if int_flag {
        Some(br.read_n_bit(12).to_owned())
    } else {
        None
    };

    let fraction_value = if fraction_flag {
        Some(br.read_n_bit(3).to_owned())
    } else {
        None
    };

    // let unknown = br.read_n_bit(2).to_owned();

    OriginCoord {
        int_flag,
        fraction_flag,
        is_negative,
        int_value,
        fraction_value,
        // unknown,
    }
}

fn write_origin(i: &OriginCoord, bw: &mut BitWriter) {
    bw.append_bit(i.int_flag);
    bw.append_bit(i.fraction_flag);

    if let Some(negative) = i.is_negative {
        bw.append_bit(negative);
    }

    if let Some(int) = &i.int_value {
        bw.append_vec(int);
    }

    if let Some(frac) = &i.fraction_value {
        bw.append_vec(frac);
    }

    // bw.append_vec(self.unknown);
}