mtzip 4.0.3

A library for making zip archives with multithreaded compression
Documentation 
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use std::io::{Seek, Write};
#[cfg(feature = "rayon")]
use std::sync::Mutex;

#[cfg(feature = "rayon")]
use rayon::prelude::*;

use super::file::{ZipFile, ZipFileNoData};

const END_OF_CENTRAL_DIR_SIGNATURE: u32 = 0x06054B50;

#[derive(Debug, Default)]
pub struct ZipData {
    pub files: Vec<ZipFile>,
}

impl ZipData {
    pub fn write<W: Write + Seek, I: IntoIterator<Item = ZipFile>>(
        &mut self,
        buf: &mut W,
        zip_file_iter: I,
    ) -> std::io::Result<()> {
        let zip_files = self.write_files_contained_and_iter(buf, zip_file_iter)?;

        let files_amount = super::files_amount_u16(&zip_files);

        let central_dir_offset = super::stream_position_u32(buf)?;

        self.write_central_dir(zip_files, buf)?;

        let central_dir_start = super::stream_position_u32(buf)?;

        self.write_end_of_central_directory(
            buf,
            central_dir_offset,
            central_dir_start,
            files_amount,
        )
    }

    #[cfg(feature = "rayon")]
    pub fn write_rayon<W: Write + Seek + Send, I: ParallelIterator<Item = ZipFile>>(
        &mut self,
        buf: &mut W,
        zip_file_iter: I,
    ) -> std::io::Result<()> {
        let zip_files = self.write_files_contained_and_par_iter(buf, zip_file_iter)?;

        let files_amount = super::files_amount_u16(&zip_files);

        let central_dir_offset = super::stream_position_u32(buf)?;

        self.write_central_dir(zip_files, buf)?;

        let central_dir_start = super::stream_position_u32(buf)?;

        self.write_end_of_central_directory(
            buf,
            central_dir_offset,
            central_dir_start,
            files_amount,
        )
    }

    #[inline]
    fn write_files_contained_and_iter<W: Write + Seek, I: IntoIterator<Item = ZipFile>>(
        &mut self,
        buf: &mut W,
        zip_files_iter: I,
    ) -> std::io::Result<Vec<ZipFileNoData>> {
        let zip_files = std::mem::take(&mut self.files);
        self.write_files_iter(buf, zip_files.into_iter().chain(zip_files_iter))
    }

    #[cfg(feature = "rayon")]
    #[inline]
    pub fn write_files_contained_and_par_iter<
        W: Write + Seek + Send,
        I: ParallelIterator<Item = ZipFile>,
    >(
        &mut self,
        buf: &mut W,
        zip_files_iter: I,
    ) -> std::io::Result<Vec<ZipFileNoData>> {
        let zip_files = std::mem::take(&mut self.files);
        self.write_files_par_iter(buf, zip_files.into_par_iter().chain(zip_files_iter))
    }

    pub fn write_files_iter<W: Write + Seek, I: IntoIterator<Item = ZipFile>>(
        &mut self,
        buf: &mut W,
        zip_files: I,
    ) -> std::io::Result<Vec<ZipFileNoData>> {
        zip_files
            .into_iter()
            .map(|zipfile| zipfile.write_local_file_header_with_data_consuming(buf))
            .collect::<std::io::Result<Vec<_>>>()
    }

    #[cfg(feature = "rayon")]
    pub fn write_files_par_iter<W: Write + Seek + Send, I: ParallelIterator<Item = ZipFile>>(
        &mut self,
        buf: &mut W,
        zip_files: I,
    ) -> std::io::Result<Vec<ZipFileNoData>> {
        let buf = Mutex::new(buf);
        zip_files
            .map(|zipfile| {
                let mut buf_lock = buf.lock().unwrap();
                zipfile.write_local_file_header_with_data_consuming(*buf_lock)
            })
            .collect::<std::io::Result<Vec<_>>>()
    }

    fn write_central_dir<W: Write, I: IntoIterator<Item = ZipFileNoData>>(
        &self,
        zip_files: I,
        buf: &mut W,
    ) -> std::io::Result<()> {
        zip_files
            .into_iter()
            .try_for_each(|zip_file| zip_file.write_central_directory_entry(buf))
    }

    const FOOTER_LENGTH: usize = 22;

    fn write_end_of_central_directory<W: Write>(
        &self,
        buf: &mut W,
        central_dir_offset: u32,
        central_dir_start: u32,
        files_amount: u16,
    ) -> std::io::Result<()> {
        // Temporary in-memory statically sized array
        let mut central_dir = [0; Self::FOOTER_LENGTH];
        {
            let mut central_dir_buf: &mut [u8] = &mut central_dir;

            // Signature
            central_dir_buf.write_all(&END_OF_CENTRAL_DIR_SIGNATURE.to_le_bytes())?;
            // number of this disk
            central_dir_buf.write_all(&0_u16.to_le_bytes())?;
            // number of the disk with start
            central_dir_buf.write_all(&0_u16.to_le_bytes())?;
            // Number of entries on this disk
            central_dir_buf.write_all(&files_amount.to_le_bytes())?;
            // Number of entries
            central_dir_buf.write_all(&files_amount.to_le_bytes())?;
            // Central dir size
            central_dir_buf.write_all(&(central_dir_start - central_dir_offset).to_le_bytes())?;
            // Central dir offset
            central_dir_buf.write_all(&central_dir_offset.to_le_bytes())?;
            // Comment length
            central_dir_buf.write_all(&0_u16.to_le_bytes())?;
        }

        buf.write_all(&central_dir)?;

        Ok(())
    }
}