1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
//! ZIP を読むところ
mod common;
use common::zip::Writer;
use folio::zip::Archive;
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 a_broken_part_is_an_error() {
// その場で展開する小さなパートと、スレッドで展開する大きなパート
let small = "<si><t>くりかえし</t></si>".repeat(3000);
let large: String = (0..40000).map(|index| format!("<si><t>くりかえし{index}</t></si>")).collect();
for (label, content) in [("small", small), ("large", large)] {
let path = place(&format!("broken-{label}"));
let mut writer = Writer::create(&path).unwrap();
writer.add("part.xml", content.as_bytes()).unwrap();
writer.finish().unwrap();
// 縮めた中身の途中の 1 バイトを変える。展開か CRC のどちらかで必ず気づく
let mut data = std::fs::read(&path).unwrap();
let middle = 30 + "part.xml".len() + 40;
data[middle] ^= 0x55;
std::fs::write(&path, &data).unwrap();
let mut archive = Archive::open(&path).unwrap();
assert!(archive.read("part.xml").is_err(), "{label}");
// 順に読むときは、開いたときか、読んでいる途中のどちらかで気づく
let failed = match archive.reader("part.xml") {
Err(_) => true,
Ok(mut reader) => loop {
match reader.next() {
Ok(Some(_)) => {}
Ok(None) => break false,
Err(_) => break true,
}
},
};
assert!(failed, "{label}");
}
}
#[test]
fn the_checksum_matches_known_values() {
use folio::crc::{Crc, checksum};
// CRC-32 の値として広く知られているもの
assert_eq!(checksum(b""), 0);
assert_eq!(checksum(b"123456789"), 0xcbf43926);
assert_eq!(checksum(b"The quick brown fox jumps over the lazy dog"), 0x414fa339);
// 16 バイトのまとまりの切れ目がどこに来ても、一度に渡したときと同じになる
let data = noise(1000, 29);
let whole = checksum(&data);
for size in [1, 3, 15, 16, 17, 100, 999] {
let mut crc = Crc::new();
for piece in data.chunks(size) {
crc.update(piece);
}
assert_eq!(crc.finish(), whole, "{size} バイトずつ");
}
}
#[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());
}