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
|
use std::io::SeekFrom;
use std::fs::File;
use std::io::prelude::*;
#[derive(Debug)]
pub enum ByteIOError {
EOF,
WrongRange,
WrongIOMode,
NotImplemented,
ReadError,
WriteError,
SeekError,
}
type ByteIOResult<T> = Result<T, ByteIOError>;
pub trait ByteIO {
fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>;
fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>;
fn read_byte(&mut self) -> ByteIOResult<u8>;
fn peek_byte(&mut self) -> ByteIOResult<u8>;
fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize>;
fn tell(&mut self) -> u64;
fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>;
fn is_eof(&mut self) -> bool;
fn is_seekable(&mut self) -> bool;
}
#[allow(dead_code)]
pub struct ByteReader<'a> {
io: &'a mut ByteIO,
}
pub struct MemoryReader<'a> {
buf: &'a [u8],
size: usize,
pos: usize,
}
pub struct FileReader<'a> {
file: &'a File,
eof: bool,
}
macro_rules! read_int {
($s: ident, $inttype: ty, $size: expr, $which: ident) => ({
let mut buf = [0; $size];
try!($s.read_buf(&mut buf));
unsafe {
Ok((*(buf.as_ptr() as *const $inttype)).$which())
}
})
}
macro_rules! peek_int {
($s: ident, $inttype: ty, $size: expr, $which: ident) => ({
let mut buf = [0; $size];
try!($s.peek_buf(&mut buf));
unsafe {
Ok((*(buf.as_ptr() as *const $inttype)).$which())
}
})
}
impl<'a> ByteReader<'a> {
pub fn new(io: &'a mut ByteIO) -> Self { ByteReader { io: io } }
pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> {
self.io.read_buf(buf)
}
pub fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> {
self.io.peek_buf(buf)
}
pub fn read_byte(&mut self) -> ByteIOResult<u8> {
self.io.read_byte()
}
pub fn peek_byte(&mut self) -> ByteIOResult<u8> {
self.io.peek_byte()
}
pub fn read_u16be(&mut self) -> ByteIOResult<u16> {
read_int!(self, u16, 2, to_be)
}
pub fn peek_u16be(&mut self) -> ByteIOResult<u16> {
peek_int!(self, u16, 2, to_be)
}
pub fn read_u24be(&mut self) -> ByteIOResult<u32> {
let p16 = self.read_u16be()?;
let p8 = self.read_byte()?;
Ok(((p16 as u32) << 8) | (p8 as u32))
}
pub fn peek_u24be(&mut self) -> ByteIOResult<u32> {
let mut src: [u8; 3] = [0; 3];
self.peek_buf(&mut src)?;
Ok(((src[0] as u32) << 16) | ((src[1] as u32) << 8) | (src[2] as u32))
}
pub fn read_u32be(&mut self) -> ByteIOResult<u32> {
read_int!(self, u32, 4, to_be)
}
pub fn peek_u32be(&mut self) -> ByteIOResult<u32> {
peek_int!(self, u32, 4, to_be)
}
pub fn read_u64be(&mut self) -> ByteIOResult<u64> {
read_int!(self, u64, 8, to_be)
}
pub fn peek_u64be(&mut self) -> ByteIOResult<u64> {
peek_int!(self, u64, 8, to_be)
}
pub fn read_u16le(&mut self) -> ByteIOResult<u16> {
read_int!(self, u16, 2, to_le)
}
pub fn peek_u16le(&mut self) -> ByteIOResult<u16> {
peek_int!(self, u16, 2, to_le)
}
pub fn read_u24le(&mut self) -> ByteIOResult<u32> {
let p8 = self.read_byte()?;
let p16 = self.read_u16le()?;
Ok(((p16 as u32) << 8) | (p8 as u32))
}
pub fn peek_u24le(&mut self) -> ByteIOResult<u32> {
let mut src: [u8; 3] = [0; 3];
self.peek_buf(&mut src)?;
Ok((src[0] as u32) | ((src[1] as u32) << 8) | ((src[2] as u32) << 16))
}
pub fn read_u32le(&mut self) -> ByteIOResult<u32> {
read_int!(self, u32, 4, to_le)
}
pub fn peek_u32le(&mut self) -> ByteIOResult<u32> {
peek_int!(self, u32, 4, to_le)
}
pub fn read_u64le(&mut self) -> ByteIOResult<u64> {
read_int!(self, u64, 8, to_le)
}
pub fn peek_u64le(&mut self) -> ByteIOResult<u64> {
peek_int!(self, u64, 8, to_le)
}
pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> {
if self.io.is_seekable() {
self.io.seek(SeekFrom::Current(len as i64))?;
} else {
let mut ssize = len;
let mut buf : [u8; 16] = [0; 16];
let mut bref = &mut buf;
while ssize > bref.len() {
self.io.read_buf(bref)?;
ssize -= bref.len();
}
while ssize > 0 {
self.io.read_byte()?;
ssize = ssize - 1;
}
}
Ok(())
}
pub fn tell(&mut self) -> u64 {
self.io.tell()
}
pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> {
self.io.seek(pos)
}
pub fn is_eof(&mut self) -> bool {
self.io.is_eof()
}
}
impl<'a> MemoryReader<'a> {
pub fn new_read(buf: &'a [u8]) -> Self {
MemoryReader { buf: buf, size: buf.len(), pos: 0 }
}
fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> {
if pos < 0 || (pos as usize) > self.size {
return Err(ByteIOError::WrongRange)
}
self.pos = pos as usize;
Ok(pos as u64)
}
}
impl<'a> ByteIO for MemoryReader<'a> {
fn read_byte(&mut self) -> ByteIOResult<u8> {
if self.is_eof() { return Err(ByteIOError::EOF); }
let res = self.buf[self.pos];
self.pos = self.pos + 1;
Ok(res)
}
fn peek_byte(&mut self) -> ByteIOResult<u8> {
if self.is_eof() { return Err(ByteIOError::EOF); }
Ok(self.buf[self.pos])
}
fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> {
let copy_size = if self.size - self.pos < buf.len() { self.size } else { buf.len() };
if copy_size == 0 { return Err(ByteIOError::EOF); }
for i in 0..copy_size {
buf[i] = self.buf[self.pos + i];
}
Ok(copy_size)
}
fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> {
let read_size = self.peek_buf(buf)?;
self.pos += read_size;
Ok(read_size)
}
#[allow(unused_variables)]
fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> {
Err(ByteIOError::NotImplemented)
}
fn tell(&mut self) -> u64 {
self.pos as u64
}
fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> {
let cur_pos = self.pos as i64;
let cur_size = self.size as i64;
match pos {
SeekFrom::Start(x) => self.real_seek(x as i64),
SeekFrom::Current(x) => self.real_seek(cur_pos + x),
SeekFrom::End(x) => self.real_seek(cur_size + x),
}
}
fn is_eof(&mut self) -> bool {
self.pos >= self.size
}
fn is_seekable(&mut self) -> bool {
true
}
}
impl<'a> FileReader<'a> {
pub fn new_read(file: &'a mut File) -> Self {
FileReader { file: file, eof : false }
}
}
impl<'a> ByteIO for FileReader<'a> {
fn read_byte(&mut self) -> ByteIOResult<u8> {
let mut byte : [u8; 1] = [0];
let err = self.file.read(&mut byte);
if let Err(_) = err { return Err(ByteIOError::ReadError); }
let sz = err.unwrap();
if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); }
Ok (byte[0])
}
fn peek_byte(&mut self) -> ByteIOResult<u8> {
let b = self.read_byte()?;
self.seek(SeekFrom::Current(-1))?;
Ok(b)
}
fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> {
let res = self.file.read(buf);
if let Err(_) = res { return Err(ByteIOError::ReadError); }
let sz = res.unwrap();
if sz < buf.len() { self.eof = true; }
Ok(sz)
}
fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> {
let size = self.read_buf(buf)?;
self.seek(SeekFrom::Current(-(size as i64)))?;
Ok(size)
}
#[allow(unused_variables)]
fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> {
Err(ByteIOError::NotImplemented)
}
fn tell(&mut self) -> u64 {
self.file.seek(SeekFrom::Current(0)).unwrap()
}
fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> {
let res = self.file.seek(pos);
match res {
Ok(r) => Ok(r),
Err(_) => Err(ByteIOError::SeekError),
}
}
fn is_eof(&mut self) -> bool {
self.eof
}
fn is_seekable(&mut self) -> bool {
true
}
}
#[cfg(test)]
mod test {
use super::*;
use std::fs::File;
#[test]
fn test_read() {
//const DATA : &'static [u8] = include_bytes!("../../assets/file");
let buf: [u8; 64] = [1; 64];
let mut mr = MemoryReader::new_read(&buf);
let mut reader = ByteReader::new(&mut mr);
assert_eq!(reader.read_byte().unwrap(), 0x01u8);
assert_eq!(reader.read_u16le().unwrap(), 0x0101u16);
assert_eq!(reader.read_u24le().unwrap(), 0x010101u32);
assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32);
assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64);
let mut file = File::open("assets/MaoMacha.asx").unwrap();
let mut fr = FileReader::new_read(&mut file);
let mut br2 = ByteReader::new(&mut fr);
assert_eq!(br2.read_byte().unwrap(), 0x30);
assert_eq!(br2.read_u24be().unwrap(), 0x26B275);
assert_eq!(br2.read_u24le().unwrap(), 0xCF668E);
assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900);
assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA);
}
#[test]
fn test_write() {
}
}
|
