ltk_meta 0.2.3

Metadata formats and utilities for League Toolkit
Documentation 
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use std::{collections::HashMap, io};

use ltk_io_ext::{measure, window_at};

use super::super::{BinProperty, Error};
use byteorder::{ReadBytesExt, WriteBytesExt, LE};

#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[derive(Debug, PartialEq)]
/// A node in the bin tree
pub struct BinTreeObject {
    pub path_hash: u32,
    pub class_hash: u32,
    pub properties: HashMap<u32, BinProperty>,
}

impl BinTreeObject {
    /// Reads a BinTreeObject from a reader.
    ///
    /// # Arguments
    ///
    /// * `reader` - A reader that implements io::Read and io::Seek.
    /// * `class_hash` - The hash of the class of the object.
    /// * `legacy` - Whether to read in legacy format.
    pub fn from_reader<R: io::Read + io::Seek + ?Sized>(
        reader: &mut R,
        class_hash: u32,
        legacy: bool,
    ) -> Result<Self, Error> {
        let size = reader.read_u32::<LE>()?;
        let (real_size, value) = measure(reader, |reader| {
            let path_hash = reader.read_u32::<LE>()?;

            let prop_count = reader.read_u16::<LE>()? as usize;
            let mut properties = HashMap::with_capacity(prop_count);
            for _ in 0..prop_count {
                let prop = BinProperty::from_reader(reader, legacy)?;
                properties.insert(prop.name_hash, prop);
            }

            Ok::<_, Error>(Self {
                path_hash,
                class_hash,
                properties,
            })
        })?;

        if size as u64 != real_size {
            return Err(Error::InvalidSize(size as _, real_size));
        }
        Ok(value)
    }

    /// Writes a BinTreeObject to a writer.
    ///
    /// # Arguments
    ///
    /// * `writer` - A writer that implements io::Write and io::Seek.
    /// * `legacy` - Whether to write in legacy format.
    pub fn to_writer<W: io::Write + io::Seek + ?Sized>(
        &self,
        writer: &mut W,
        legacy: bool,
    ) -> io::Result<()> {
        if legacy {
            unimplemented!("legacy BinTreeObject write");
        }

        let size_pos = writer.stream_position()?;
        writer.write_u32::<LE>(0)?;

        let (size, _) = measure(writer, |writer| {
            writer.write_u32::<LE>(self.path_hash)?;
            writer.write_u16::<LE>(self.properties.len() as _)?;
            for prop in self.properties.values() {
                prop.to_writer(writer)?;
            }
            Ok::<_, io::Error>(())
        })?;

        window_at(writer, size_pos, |writer| writer.write_u32::<LE>(size as _))?;
        Ok(())
    }
}