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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
use std::io::{Read, Write};
use super::{Properties, PropertiesError, Result};
fn decode_unicode(data: &[u8]) -> Result<u32> {
let mut val: u32 = 0;
for &v in data {
match v {
b'0'..=b'9' => {
val = (val << 4) + (v - b'0') as u32;
}
b'a'..=b'f' => {
val = (val << 4) + 10 + (v - b'a') as u32;
}
b'A'..=b'F' => {
val = (val << 4) + 10 + (v - b'A') as u32;
}
_ => {
return Err(PropertiesError::new(format!(
"parse unicode failed, invalid char '{}'",
v as char
)))
}
}
}
Ok(val)
}
fn load_convert(data: &[u8]) -> Result<Vec<u8>> {
let mut result: Vec<u8> = Vec::new();
let mut idx = 0;
let end = data.len();
let mut c: u8;
let mut val: u32;
while idx < end {
c = data[idx];
//println!("-------> {} {}", idx, c as char);
if c == b'\\' {
// must have one more byte, check line reader
idx = idx + 1;
c = data[idx];
if c == b'u' {
if idx + 5 > end {
return Err(PropertiesError::new(
"invalid escape unicode, at least 4 bytes",
));
}
val = decode_unicode(&data[idx + 1..idx + 5])?;
idx = idx + 5;
if val >= 0xD800 && val <= 0xDBFF {
if idx + 6 > end {
return Err(PropertiesError::new(
"invalid surrogates escape unicode, at least 6 bytes",
));
}
if data[idx] != b'\\' || data[idx + 1] != b'u' {
return Err(PropertiesError::new(format!(
"got lead surrogates without trail {:04X}",
val
)));
}
idx = idx + 2;
let v = decode_unicode(&data[idx..idx + 4])?;
if v < 0xDC00 || v > 0xDFFF {
return Err(PropertiesError::new(format!(
"invalid trail surrogates, '{:04X}' should between [0xDC00, 0xDFFF]",
v
)));
}
val = ((val - 0xD800) << 10) + v - 0xDC00 + 0x10000;
idx = idx + 4;
}
// should not failed here
if let Some(ch) = char::from_u32(val) {
result.write(ch.to_string().as_bytes())?;
}
} else {
match c {
b't' => result.push(b'\t'),
b'r' => result.push(b'\r'),
b'n' => result.push(b'\n'),
b'f' => result.push(b'\x0c'),
_ => result.push(c),
};
idx = idx + 1;
}
} else {
result.push(c);
idx = idx + 1;
}
}
return Ok(result);
}
// Read in a "logical line" from an reader, skip all comment and
// blank lines and filter out those leading whitespace characters
// (\u0020, \u0009 and \u000c) from beginning of a "natural line".
// Method returns the char length of the "logical line" and stores
// the line in "line" field.
struct LineReader {
buff: [u8; 8 * 1024],
line: Vec<u8>,
limit: usize,
offset: usize,
}
impl LineReader {
fn new() -> Self {
Self {
buff: [0u8; 8 * 1024],
line: Vec::with_capacity(1024),
limit: 0,
offset: 0,
}
}
fn read_line<R: Read>(&mut self, mut reader: R) -> Result<&Vec<u8>> {
let mut c: u8;
let mut skip_lf = false;
let mut skip_white_space = true;
let mut is_new_line = true;
let mut is_comment_line = false;
let mut preceding_backslash = false;
let mut appended_line_begin = false;
self.line.clear();
loop {
if self.offset >= self.limit {
self.limit = reader.read(&mut self.buff)?;
if self.limit <= 0 {
if is_comment_line {
self.line.clear();
}
if preceding_backslash {
self.line.pop();
}
return Ok(&self.line);
}
}
c = self.buff[self.offset];
self.offset = self.offset + 1;
//println!(
// "Handle char {}, lf={} white={} newline={} comment={} backslash={}",
// c as char,
// skip_lf,
// skip_white_space,
// is_new_line,
// is_comment_line,
// preceding_backslash
//);
if skip_lf {
skip_lf = false;
if c == b'\n' {
continue;
}
}
if skip_white_space {
if c == b' ' || c == b'\t' || c == b'\x0c' {
continue;
}
if !appended_line_begin && (c == b'\r' || c == b'\n') {
continue;
}
skip_white_space = false;
appended_line_begin = false;
}
if is_new_line {
is_new_line = false;
if c == b'#' || c == b'!' {
is_comment_line = true;
continue;
}
}
if c != b'\n' && c != b'\r' {
self.line.push(c);
if c == b'\\' {
preceding_backslash = !preceding_backslash;
} else {
preceding_backslash = false;
}
} else {
// new natural line
if is_comment_line {
is_comment_line = false;
is_new_line = true;
skip_white_space = true;
preceding_backslash = false;
self.line.clear();
continue;
}
if preceding_backslash {
self.line.pop();
// skip the leading whitespace characters in following line
skip_white_space = true;
appended_line_begin = true;
preceding_backslash = false;
if c == b'\r' {
skip_lf = true;
}
} else {
return Ok(&self.line);
}
}
}
}
}
impl Properties {
pub fn load<R: Read>(&mut self, mut reader: R) -> Result<()> {
let mut lr = LineReader::new();
loop {
match lr.read_line(&mut reader) {
Ok(l) => {
if l.len() == 0 {
return Ok(());
}
//println!("Got new line: {}", String::from_utf8(l.to_vec()).unwrap());
let mut key_len = 0;
let mut value_start = 0;
let mut backslash = false;
let mut has_sep = false;
let line = l.as_slice();
let limit = l.len();
while key_len < limit {
let c = line[key_len];
if (c == b'=' || c == b':') && !backslash {
value_start = key_len + 1;
has_sep = true;
break;
} else if (c == b' ' || c == b'\t' || c == b'\x0c') && !backslash {
value_start = key_len + 1;
break;
}
if c == b'\\' {
backslash = !backslash;
} else {
backslash = false;
}
key_len = key_len + 1;
}
while value_start < limit {
let c = line[value_start];
if c != b' ' && c != b'\t' && c != b'\x0c' {
if !has_sep && (c == b'=' || c == b':') {
has_sep = true;
} else {
break;
}
}
value_start = value_start + 1;
}
//println!(
// "Got key={} value={}",
// String::from_utf8(l[..key_len].to_vec()).unwrap(),
// String::from_utf8(l[value_start..].to_vec()).unwrap(),
//);
let key: String = String::from_utf8(load_convert(&l[..key_len])?.to_vec())?;
let val: String = String::from_utf8(load_convert(&l[value_start..])?.to_vec())?;
self.data.lock().unwrap().insert(key, val);
}
Err(e) => return Err(e),
}
}
}
}
#[cfg(test)]
mod tests {
use super::Properties;
#[test]
fn abnormal() {
let cases = vec![
("key=\\u4xyz", "parse unicode failed, invalid char"),
("key=\\u4f6", "invalid escape unicode, at least 4 bytes"),
(
"key=\\ud83c\\more data",
"got lead surrogates without trail",
),
(
"key=\\ud83c\\ue00",
"invalid surrogates escape unicode, at least 6 bytes",
),
("key=\\ud83c\\uda00", "invalid trail surrogates"),
("key=\\ud83c\\ue000", "invalid trail surrogates"),
];
for (input, err) in &cases {
let mut prop = Properties::new();
match prop.load(input.as_bytes()) {
Ok(_) => {
if let Some(_) = prop.get("key") {
panic!("Item should not exist")
}
panic!("Load properties should failed")
}
Err(e) => {
let msg = format!("{}", e);
assert!(msg.starts_with(err), "{}", e);
}
}
}
}
#[test]
fn normal() {
let cases = vec![
("", vec![]),
("a0=b", vec![("a0", "b")]),
("a0 \t\x0c b", vec![("a0", "b")]),
("a0\tb", vec![("a0", "b")]),
("a0\x0cb", vec![("a0", "b")]),
("a0:b", vec![("a0", "b")]),
("a0=\\", vec![("a0", "")]),
("a0=\\b", vec![("a0", "b")]),
("a1 = \t\x0cb", vec![("a1", "b")]),
("a2=b\\:b", vec![("a2", "b:b")]),
("a3=b\\\n c, d ", vec![("a3", "bc, d ")]),
("a3=\\\\\\\ncd", vec![("a3", "\\cd")]),
("a4=d\\", vec![("a4", "d")]),
("a5=\\th\\re\\nl\\fl", vec![("a5", "\th\re\nl\x0cl")]),
("a6=\u{4f60}\u{597d}\u{1f310}", vec![("a6", "你好🌐")]),
("\\!a=\\#b", vec![("!a", "#b")]),
(
"a0=b\na1=c\\\nd=e\ra2=d\r\n#comment1\n#comment2\\\na3=e\\\r\n#asy\n \n#comment4",
vec![("a0", "b"), ("a1", "cd=e"), ("a2", "d"), ("a3", "e#asy")],
),
];
for &(input, ref r) in &cases {
let mut prop = Properties::new();
match prop.load(input.as_bytes()) {
Ok(_) => {
if r.len() != prop.len() {
panic!("invalid items, expect={} got={}", r.len(), prop.len());
}
for l in r {
match prop.get(&l.0) {
Some(val) => {
if val.ne(&l.1) {
panic!("invalid key {}, expect={} got={}", l.0, l.1, val);
}
}
None => panic!("key {} doesn't exist", l.0),
}
}
}
Err(e) => panic!("Load properties failed, {}", e),
}
}
}
#[test]
fn unicode() {
let cases = vec![
(
"a0=\\u4F60\\u597D\\u00A9\\uD83C\\uDF10\n",
vec![("a0", "你好©🌐")],
),
(
"a0=\\u4f60\\u597d\\u00a9\\ud83c\\udf10\n",
vec![("a0", "你好©🌐")],
),
];
for &(input, ref r) in &cases {
let mut prop = Properties::new();
match prop.load(input.as_bytes()) {
Ok(_) => {
if r.len() != prop.len() {
panic!("invalid items, expect={} got={}", r.len(), prop.len());
}
for l in r {
match prop.get(&l.0) {
Some(val) => {
if val.ne(&l.1) {
panic!("invalid key {}, expect={} got={}", l.0, l.1, val);
}
}
None => panic!("key {} doesn't exist", l.0),
}
}
}
Err(e) => panic!("Load properties failed, {}", e),
}
}
}
}