libarx 0.4.1

The library to handle arx file, the file archive format based on Jubako.
Documentation 
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use super::entry::*;
use super::entry_type::EntryType;
use super::AllProperties;
use crate::{ArxFormatError, BaseError};
use jbk::reader::builder::PropertyBuilderTrait;
use jbk::reader::ByteSlice;

pub trait Builder {
    type Entry;

    fn new(properties: &AllProperties) -> Self;
    fn create_entry(&self, idx: jbk::EntryIdx, reader: &ByteSlice) -> jbk::Result<Self::Entry>;
}

impl Builder for () {
    type Entry = ();
    fn new(_properties: &AllProperties) -> Self {}
    fn create_entry(&self, _idx: jbk::EntryIdx, _reader: &ByteSlice) -> jbk::Result<Self::Entry> {
        Ok(())
    }
}

pub trait FullBuilderTrait {
    type Entry: EntryDef;

    fn new(properties: &AllProperties) -> Self;
    fn create_file(
        &self,
        idx: jbk::EntryIdx,
        reader: &ByteSlice,
    ) -> jbk::Result<<Self::Entry as EntryDef>::File>;
    fn create_link(
        &self,
        idx: jbk::EntryIdx,
        reader: &ByteSlice,
    ) -> jbk::Result<<Self::Entry as EntryDef>::Link>;
    fn create_dir(
        &self,
        idx: jbk::EntryIdx,
        reader: &ByteSlice,
    ) -> jbk::Result<<Self::Entry as EntryDef>::Dir>;
}

impl<F, L, D> FullBuilderTrait for (F, L, D)
where
    F: Builder,
    L: Builder,
    D: Builder,
{
    type Entry = (F::Entry, L::Entry, D::Entry);

    fn new(properties: &AllProperties) -> Self {
        let file_builder = F::new(properties);
        let link_builder = L::new(properties);
        let dir_builder = D::new(properties);
        (file_builder, link_builder, dir_builder)
    }

    fn create_file(
        &self,
        idx: jbk::EntryIdx,
        reader: &ByteSlice,
    ) -> jbk::Result<<Self::Entry as EntryDef>::File> {
        self.0.create_entry(idx, reader)
    }

    fn create_link(
        &self,
        idx: jbk::EntryIdx,
        reader: &ByteSlice,
    ) -> jbk::Result<<Self::Entry as EntryDef>::Link> {
        self.1.create_entry(idx, reader)
    }

    fn create_dir(
        &self,
        idx: jbk::EntryIdx,
        reader: &ByteSlice,
    ) -> jbk::Result<<Self::Entry as EntryDef>::Dir> {
        self.2.create_entry(idx, reader)
    }
}

pub(crate) struct RealBuilder<B: FullBuilderTrait> {
    store: jbk::reader::EntryStore,
    variant_id_property: jbk::reader::builder::VariantIdBuilder<EntryType>,
    first_child_property: jbk::reader::builder::IntProperty,
    nb_children_property: jbk::reader::builder::IntProperty,
    builder: B,
}

impl<B> RealBuilder<B>
where
    B: FullBuilderTrait,
{
    pub fn new(properties: &AllProperties) -> Self {
        let builder = B::new(properties);
        Self {
            store: properties.store.clone(),
            variant_id_property: properties.variant_id_property.clone(),
            first_child_property: properties.dir_first_child_property.clone(),
            nb_children_property: properties.dir_nb_children_property.clone(),
            builder,
        }
    }
}

impl<B> jbk::reader::builder::BuilderTrait for RealBuilder<B>
where
    B: FullBuilderTrait,
{
    type Entry = Entry<B::Entry>;
    type Error = BaseError;

    fn create_entry(&self, idx: jbk::EntryIdx) -> Result<Option<Self::Entry>, Self::Error> {
        self.store
            .get_entry_reader(idx)
            .map(|reader| {
                let file_type = self.variant_id_property.create(&reader)?;
                Ok(match file_type {
                    Some(EntryType::File) => {
                        let entry = self.builder.create_file(idx, &reader)?;
                        Entry::File(entry)
                    }
                    Some(EntryType::Link) => {
                        let entry = self.builder.create_link(idx, &reader)?;
                        Entry::Link(entry)
                    }
                    Some(EntryType::Dir) => {
                        let first_child: jbk::EntryIdx =
                            (self.first_child_property.create(&reader)? as u32).into();
                        let nb_children: jbk::EntryCount =
                            (self.nb_children_property.create(&reader)? as u32).into();
                        let range = jbk::EntryRange::new_from_size(first_child, nb_children);
                        let entry = self.builder.create_dir(idx, &reader)?;
                        Entry::Dir(range, entry)
                    }
                    None => return Err(ArxFormatError("Unknown variant").into()),
                })
            })
            .transpose()
    }
}