archive.rs

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//! ZIP に書いて読み戻すところ

use folio::zip::{Archive, Writer};
use std::path::{Path, PathBuf};


/// 試しに使うファイルの置き場。target の下なので消えても差し支えない
fn place(name: &str) -> PathBuf {
    let mut path = PathBuf::from("target");
    path.push(format!("archive-{name}.zip"));
    path
}


/// 決まった並びの疑似乱数
fn noise(count: usize, seed: u64) -> Vec<u8> {
    let mut value = seed;
    let mut result = Vec::with_capacity(count);

    for _ in 0..count {
        value = value.wrapping_mul(6364136223846793005).wrapping_add(1442695040888963407);
        result.push((value >> 33) as u8);
    }

    result
}


#[test]
fn parts_come_back_as_they_were_put_in() {
    let path = place("plain");
    let text = "<?xml version=\"1.0\"?><Types/>".as_bytes().to_vec();
    let long = "<si><t>あ</t></si>".repeat(5000).into_bytes();
    let image = noise(4000, 5);

    let mut writer = Writer::create(&path).unwrap();
    writer.add("[Content_Types].xml", &text).unwrap();
    writer.add("xl/sharedStrings.xml", &long).unwrap();
    writer.add_stored("xl/media/image1.png", &image).unwrap();
    writer.add("日本語の名前.xml", "こんにちは".as_bytes()).unwrap();
    writer.finish().unwrap();

    let mut archive = Archive::open(&path).unwrap();
    assert_eq!(archive.entry().len(), 4);
    assert!(archive.has("xl/sharedStrings.xml"));
    assert_eq!(archive.read("[Content_Types].xml").unwrap(), text);
    assert_eq!(archive.read("xl/sharedStrings.xml").unwrap(), long);
    assert_eq!(archive.read("xl/media/image1.png").unwrap(), image);
    assert_eq!(archive.read("日本語の名前.xml").unwrap(), "こんにちは".as_bytes());
}


#[test]
fn a_part_of_unknown_length_can_be_written() {
    let path = place("stream");
    let mut writer = Writer::create(&path).unwrap();
    writer.start("xl/worksheets/sheet1.xml").unwrap();
    let mut whole = Vec::new();

    for row in 0..50000 {
        let line = format!("<row r=\"{row}\"><c r=\"A{row}\"><v>{row}</v></c></row>");
        writer.write(line.as_bytes()).unwrap();
        whole.extend_from_slice(line.as_bytes());
    }

    writer.close().unwrap();
    writer.finish().unwrap();

    let mut archive = Archive::open(&path).unwrap();
    assert_eq!(archive.read("xl/worksheets/sheet1.xml").unwrap(), whole);
}


#[test]
fn a_big_part_uses_zip64() {
    let path = place("zip64");
    let mut writer = Writer::create(&path).unwrap();
    writer.start("big.bin").unwrap();
    let mut whole = Vec::new();

    // 縮まらない並びを 12MB。8MB を超えるので ZIP64 のヘッダになる
    for step in 0..600 {
        let piece = noise(20000, step + 1);
        writer.write(&piece).unwrap();
        whole.extend_from_slice(&piece);
    }

    writer.close().unwrap();
    writer.finish().unwrap();

    let mut archive = Archive::open(&path).unwrap();
    assert_eq!(archive.entry()[0].uncompressed, whole.len() as u64);
    assert_eq!(archive.read("big.bin").unwrap(), whole);
}


#[test]
fn a_part_can_be_read_a_piece_at_a_time() {
    let path = place("piece");
    let whole = "<sheetData>".to_string() + &"<row/>".repeat(200000) + "</sheetData>";
    let image = noise(300000, 23);

    let mut writer = Writer::create(&path).unwrap();
    writer.add("sheet.xml", whole.as_bytes()).unwrap();
    writer.add_stored("image.png", &image).unwrap();
    writer.finish().unwrap();

    let mut archive = Archive::open(&path).unwrap();

    for (name, want) in [("sheet.xml", whole.as_bytes().to_vec()), ("image.png", image)] {
        let mut reader = archive.reader(name).unwrap();
        let mut back = Vec::new();

        while let Some(piece) = reader.next().unwrap() {
            back.extend_from_slice(&piece);
        }

        assert_eq!(back, want, "{name}");
    }
}


#[test]
fn an_entry_can_be_copied_without_unpacking_it() {
    let source_path = place("source");
    let target_path = place("target");
    let long = "<si><t>くりかえし</t></si>".repeat(3000).into_bytes();

    let mut writer = Writer::create(&source_path).unwrap();
    writer.add("keep.xml", &long).unwrap();
    writer.add("drop.xml", b"<drop/>").unwrap();
    writer.finish().unwrap();

    let mut source = Archive::open(&source_path).unwrap();
    let packed = source.raw("keep.xml").unwrap().len();

    let mut writer = Writer::create(&target_path).unwrap();
    writer.copy(&mut source, "keep.xml").unwrap();
    writer.add("new.xml", b"<new/>").unwrap();
    writer.finish().unwrap();

    let mut target = Archive::open(&target_path).unwrap();
    assert_eq!(target.entry().len(), 2);
    assert!(!target.has("drop.xml"));
    assert_eq!(target.read("keep.xml").unwrap(), long);

    // 展開も圧縮もしていないので、縮んだ長さがそのまま同じになる
    assert_eq!(target.raw("keep.xml").unwrap().len(), packed);
}


#[test]
fn a_missing_part_is_an_error() {
    let path = place("missing");
    let mut writer = Writer::create(&path).unwrap();
    writer.add("one.xml", b"<one/>").unwrap();
    writer.finish().unwrap();

    let mut archive = Archive::open(&path).unwrap();
    assert!(archive.read("two.xml").is_err());
}


#[test]
fn a_file_that_is_not_a_zip_is_an_error() {
    let path = Path::new("target/archive-broken.zip");
    std::fs::write(path, "これは ZIP ではありません").unwrap();
    assert!(Archive::open(path).is_err());
}