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Commit | Line | Data |
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90aa4e6b KS |
1 | use std::io::SeekFrom; |
2 | use std::fs::File; | |
3 | use std::io::prelude::*; | |
4 | ||
5 | #[derive(Debug)] | |
6 | pub enum ByteIOError { | |
7 | EOF, | |
8 | WrongRange, | |
9 | WrongIOMode, | |
10 | NotImplemented, | |
11 | ReadError, | |
12 | WriteError, | |
13 | SeekError, | |
14 | } | |
15 | ||
16 | type ByteIOResult<T> = Result<T, ByteIOError>; | |
17 | ||
18 | pub trait ByteIO { | |
19 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; | |
89de616c | 20 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
794364cf | 21 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
90aa4e6b | 22 | fn read_byte(&mut self) -> ByteIOResult<u8>; |
794364cf | 23 | fn peek_byte(&mut self) -> ByteIOResult<u8>; |
90aa4e6b KS |
24 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize>; |
25 | fn tell(&mut self) -> u64; | |
26 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>; | |
27 | fn is_eof(&mut self) -> bool; | |
28 | fn is_seekable(&mut self) -> bool; | |
29 | } | |
30 | ||
31 | #[allow(dead_code)] | |
32 | pub struct ByteReader<'a> { | |
33 | io: &'a mut ByteIO, | |
34 | } | |
35 | ||
36 | pub struct MemoryReader<'a> { | |
37 | buf: &'a [u8], | |
38 | size: usize, | |
39 | pos: usize, | |
90aa4e6b KS |
40 | } |
41 | ||
42 | pub struct FileReader<'a> { | |
43 | file: &'a File, | |
44 | eof: bool, | |
45 | } | |
46 | ||
47 | macro_rules! read_int { | |
48 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
49 | let mut buf = [0; $size]; | |
50 | try!($s.read_buf(&mut buf)); | |
51 | unsafe { | |
52 | Ok((*(buf.as_ptr() as *const $inttype)).$which()) | |
53 | } | |
54 | }) | |
55 | } | |
56 | ||
794364cf KS |
57 | macro_rules! peek_int { |
58 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
59 | let mut buf = [0; $size]; | |
60 | try!($s.peek_buf(&mut buf)); | |
61 | unsafe { | |
62 | Ok((*(buf.as_ptr() as *const $inttype)).$which()) | |
63 | } | |
64 | }) | |
65 | } | |
66 | ||
90aa4e6b | 67 | impl<'a> ByteReader<'a> { |
5a5a3ecb | 68 | pub fn new(io: &'a mut ByteIO) -> Self { ByteReader { io: io } } |
90aa4e6b KS |
69 | |
70 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
71 | self.io.read_buf(buf) | |
72 | } | |
73 | ||
89de616c KS |
74 | pub fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
75 | self.io.read_buf_some(buf) | |
76 | } | |
77 | ||
794364cf KS |
78 | pub fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
79 | self.io.peek_buf(buf) | |
80 | } | |
81 | ||
90aa4e6b KS |
82 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { |
83 | self.io.read_byte() | |
84 | } | |
85 | ||
794364cf KS |
86 | pub fn peek_byte(&mut self) -> ByteIOResult<u8> { |
87 | self.io.peek_byte() | |
88 | } | |
89 | ||
90aa4e6b KS |
90 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { |
91 | read_int!(self, u16, 2, to_be) | |
92 | } | |
93 | ||
794364cf KS |
94 | pub fn peek_u16be(&mut self) -> ByteIOResult<u16> { |
95 | peek_int!(self, u16, 2, to_be) | |
96 | } | |
97 | ||
90aa4e6b | 98 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { |
794364cf KS |
99 | let p16 = self.read_u16be()?; |
100 | let p8 = self.read_byte()?; | |
101 | Ok(((p16 as u32) << 8) | (p8 as u32)) | |
102 | } | |
103 | ||
104 | pub fn peek_u24be(&mut self) -> ByteIOResult<u32> { | |
105 | let mut src: [u8; 3] = [0; 3]; | |
106 | self.peek_buf(&mut src)?; | |
107 | Ok(((src[0] as u32) << 16) | ((src[1] as u32) << 8) | (src[2] as u32)) | |
90aa4e6b KS |
108 | } |
109 | ||
110 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { | |
111 | read_int!(self, u32, 4, to_be) | |
112 | } | |
113 | ||
794364cf KS |
114 | pub fn peek_u32be(&mut self) -> ByteIOResult<u32> { |
115 | peek_int!(self, u32, 4, to_be) | |
116 | } | |
117 | ||
90aa4e6b KS |
118 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { |
119 | read_int!(self, u64, 8, to_be) | |
120 | } | |
121 | ||
794364cf KS |
122 | pub fn peek_u64be(&mut self) -> ByteIOResult<u64> { |
123 | peek_int!(self, u64, 8, to_be) | |
124 | } | |
125 | ||
90aa4e6b KS |
126 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { |
127 | read_int!(self, u16, 2, to_le) | |
128 | } | |
129 | ||
794364cf KS |
130 | pub fn peek_u16le(&mut self) -> ByteIOResult<u16> { |
131 | peek_int!(self, u16, 2, to_le) | |
132 | } | |
133 | ||
90aa4e6b | 134 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { |
794364cf KS |
135 | let p8 = self.read_byte()?; |
136 | let p16 = self.read_u16le()?; | |
137 | Ok(((p16 as u32) << 8) | (p8 as u32)) | |
138 | } | |
139 | ||
140 | pub fn peek_u24le(&mut self) -> ByteIOResult<u32> { | |
141 | let mut src: [u8; 3] = [0; 3]; | |
142 | self.peek_buf(&mut src)?; | |
143 | Ok((src[0] as u32) | ((src[1] as u32) << 8) | ((src[2] as u32) << 16)) | |
90aa4e6b KS |
144 | } |
145 | ||
146 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { | |
147 | read_int!(self, u32, 4, to_le) | |
148 | } | |
149 | ||
794364cf KS |
150 | pub fn peek_u32le(&mut self) -> ByteIOResult<u32> { |
151 | peek_int!(self, u32, 4, to_le) | |
152 | } | |
153 | ||
90aa4e6b KS |
154 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { |
155 | read_int!(self, u64, 8, to_le) | |
156 | } | |
157 | ||
794364cf KS |
158 | pub fn peek_u64le(&mut self) -> ByteIOResult<u64> { |
159 | peek_int!(self, u64, 8, to_le) | |
160 | } | |
161 | ||
6b167b0c | 162 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> { |
90aa4e6b KS |
163 | if self.io.is_seekable() { |
164 | self.io.seek(SeekFrom::Current(len as i64))?; | |
165 | } else { | |
166 | let mut ssize = len; | |
167 | let mut buf : [u8; 16] = [0; 16]; | |
168 | let mut bref = &mut buf; | |
169 | while ssize > bref.len() { | |
170 | self.io.read_buf(bref)?; | |
171 | ssize -= bref.len(); | |
172 | } | |
173 | while ssize > 0 { | |
174 | self.io.read_byte()?; | |
175 | ssize = ssize - 1; | |
176 | } | |
177 | } | |
6b167b0c | 178 | Ok(()) |
90aa4e6b KS |
179 | } |
180 | ||
181 | pub fn tell(&mut self) -> u64 { | |
182 | self.io.tell() | |
183 | } | |
184 | ||
185 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
186 | self.io.seek(pos) | |
187 | } | |
188 | ||
189 | pub fn is_eof(&mut self) -> bool { | |
190 | self.io.is_eof() | |
191 | } | |
192 | } | |
193 | ||
194 | impl<'a> MemoryReader<'a> { | |
195 | ||
196 | pub fn new_read(buf: &'a [u8]) -> Self { | |
794364cf | 197 | MemoryReader { buf: buf, size: buf.len(), pos: 0 } |
90aa4e6b KS |
198 | } |
199 | ||
200 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
201 | if pos < 0 || (pos as usize) > self.size { | |
202 | return Err(ByteIOError::WrongRange) | |
203 | } | |
204 | self.pos = pos as usize; | |
205 | Ok(pos as u64) | |
206 | } | |
90aa4e6b KS |
207 | } |
208 | ||
209 | impl<'a> ByteIO for MemoryReader<'a> { | |
210 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
90aa4e6b KS |
211 | if self.is_eof() { return Err(ByteIOError::EOF); } |
212 | let res = self.buf[self.pos]; | |
213 | self.pos = self.pos + 1; | |
214 | Ok(res) | |
215 | } | |
216 | ||
794364cf KS |
217 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
218 | if self.is_eof() { return Err(ByteIOError::EOF); } | |
219 | Ok(self.buf[self.pos]) | |
220 | } | |
221 | ||
222 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
90aa4e6b KS |
223 | let copy_size = if self.size - self.pos < buf.len() { self.size } else { buf.len() }; |
224 | if copy_size == 0 { return Err(ByteIOError::EOF); } | |
225 | for i in 0..copy_size { | |
226 | buf[i] = self.buf[self.pos + i]; | |
227 | } | |
90aa4e6b KS |
228 | Ok(copy_size) |
229 | } | |
230 | ||
794364cf | 231 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
89de616c KS |
232 | let read_size = self.peek_buf(buf)?; |
233 | if read_size < buf.len() { return Err(ByteIOError::EOF); } | |
234 | self.pos += read_size; | |
235 | Ok(read_size) | |
236 | } | |
237 | ||
238 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
794364cf KS |
239 | let read_size = self.peek_buf(buf)?; |
240 | self.pos += read_size; | |
241 | Ok(read_size) | |
242 | } | |
243 | ||
90aa4e6b KS |
244 | #[allow(unused_variables)] |
245 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> { | |
90aa4e6b KS |
246 | Err(ByteIOError::NotImplemented) |
247 | } | |
248 | ||
249 | fn tell(&mut self) -> u64 { | |
250 | self.pos as u64 | |
251 | } | |
252 | ||
253 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
254 | let cur_pos = self.pos as i64; | |
255 | let cur_size = self.size as i64; | |
256 | match pos { | |
257 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
258 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
259 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
260 | } | |
261 | } | |
262 | ||
263 | fn is_eof(&mut self) -> bool { | |
264 | self.pos >= self.size | |
265 | } | |
266 | ||
267 | fn is_seekable(&mut self) -> bool { | |
268 | true | |
269 | } | |
270 | } | |
271 | ||
272 | impl<'a> FileReader<'a> { | |
273 | ||
274 | pub fn new_read(file: &'a mut File) -> Self { | |
275 | FileReader { file: file, eof : false } | |
276 | } | |
277 | } | |
278 | ||
279 | impl<'a> ByteIO for FileReader<'a> { | |
280 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
281 | let mut byte : [u8; 1] = [0]; | |
282 | let err = self.file.read(&mut byte); | |
283 | if let Err(_) = err { return Err(ByteIOError::ReadError); } | |
284 | let sz = err.unwrap(); | |
285 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } | |
286 | Ok (byte[0]) | |
287 | } | |
288 | ||
794364cf KS |
289 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
290 | let b = self.read_byte()?; | |
291 | self.seek(SeekFrom::Current(-1))?; | |
292 | Ok(b) | |
293 | } | |
294 | ||
90aa4e6b KS |
295 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
296 | let res = self.file.read(buf); | |
297 | if let Err(_) = res { return Err(ByteIOError::ReadError); } | |
89de616c KS |
298 | let sz = res.unwrap(); |
299 | if sz < buf.len() { self.eof = true; return Err(ByteIOError::EOF); } | |
300 | Ok(sz) | |
301 | } | |
302 | ||
303 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
304 | let res = self.file.read(buf); | |
305 | if let Err(_) = res { return Err(ByteIOError::ReadError); } | |
90aa4e6b KS |
306 | let sz = res.unwrap(); |
307 | if sz < buf.len() { self.eof = true; } | |
308 | Ok(sz) | |
309 | } | |
310 | ||
794364cf KS |
311 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
312 | let size = self.read_buf(buf)?; | |
313 | self.seek(SeekFrom::Current(-(size as i64)))?; | |
314 | Ok(size) | |
315 | } | |
316 | ||
90aa4e6b KS |
317 | #[allow(unused_variables)] |
318 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> { | |
319 | Err(ByteIOError::NotImplemented) | |
320 | } | |
321 | ||
322 | fn tell(&mut self) -> u64 { | |
323 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
324 | } | |
325 | ||
326 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
327 | let res = self.file.seek(pos); | |
328 | match res { | |
329 | Ok(r) => Ok(r), | |
330 | Err(_) => Err(ByteIOError::SeekError), | |
331 | } | |
332 | } | |
333 | ||
334 | fn is_eof(&mut self) -> bool { | |
335 | self.eof | |
336 | } | |
337 | ||
338 | fn is_seekable(&mut self) -> bool { | |
339 | true | |
340 | } | |
341 | } | |
342 | ||
343 | #[cfg(test)] | |
344 | mod test { | |
345 | use super::*; | |
346 | use std::fs::File; | |
347 | ||
348 | #[test] | |
349 | fn test_read() { | |
350 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); | |
351 | let buf: [u8; 64] = [1; 64]; | |
352 | let mut mr = MemoryReader::new_read(&buf); | |
353 | let mut reader = ByteReader::new(&mut mr); | |
354 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); | |
355 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); | |
356 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); | |
357 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); | |
358 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); | |
359 | let mut file = File::open("assets/MaoMacha.asx").unwrap(); | |
360 | let mut fr = FileReader::new_read(&mut file); | |
361 | let mut br2 = ByteReader::new(&mut fr); | |
362 | assert_eq!(br2.read_byte().unwrap(), 0x30); | |
363 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); | |
364 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); | |
365 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); | |
366 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); | |
367 | } | |
368 | #[test] | |
369 | fn test_write() { | |
370 | } | |
371 | } |