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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>; | |
20 | fn read_byte(&mut self) -> ByteIOResult<u8>; | |
21 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize>; | |
22 | fn tell(&mut self) -> u64; | |
23 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>; | |
24 | fn is_eof(&mut self) -> bool; | |
25 | fn is_seekable(&mut self) -> bool; | |
26 | } | |
27 | ||
28 | #[allow(dead_code)] | |
29 | pub struct ByteReader<'a> { | |
30 | io: &'a mut ByteIO, | |
31 | } | |
32 | ||
33 | pub struct MemoryReader<'a> { | |
34 | buf: &'a [u8], | |
35 | size: usize, | |
36 | pos: usize, | |
37 | do_write: bool, | |
38 | } | |
39 | ||
40 | pub struct FileReader<'a> { | |
41 | file: &'a File, | |
42 | eof: bool, | |
43 | } | |
44 | ||
45 | macro_rules! read_int { | |
46 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
47 | let mut buf = [0; $size]; | |
48 | try!($s.read_buf(&mut buf)); | |
49 | unsafe { | |
50 | Ok((*(buf.as_ptr() as *const $inttype)).$which()) | |
51 | } | |
52 | }) | |
53 | } | |
54 | ||
55 | impl<'a> ByteReader<'a> { | |
56 | pub fn new(io: &'a mut ByteIO) -> ByteReader { ByteReader { io: io } } | |
57 | ||
58 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
59 | self.io.read_buf(buf) | |
60 | } | |
61 | ||
62 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { | |
63 | self.io.read_byte() | |
64 | } | |
65 | ||
66 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { | |
67 | read_int!(self, u16, 2, to_be) | |
68 | } | |
69 | ||
70 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { | |
71 | let p16 = self.read_u16be(); | |
72 | if let Err(e) = p16 { return Err(e); } | |
73 | let p8 = self.read_byte(); | |
74 | if let Err(e) = p8 { return Err(e); } | |
75 | Ok(((p16.unwrap() as u32) << 8) | (p8.unwrap() as u32)) | |
76 | } | |
77 | ||
78 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { | |
79 | read_int!(self, u32, 4, to_be) | |
80 | } | |
81 | ||
82 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { | |
83 | read_int!(self, u64, 8, to_be) | |
84 | } | |
85 | ||
86 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { | |
87 | read_int!(self, u16, 2, to_le) | |
88 | } | |
89 | ||
90 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { | |
91 | let p8 = self.read_byte(); | |
92 | if let Err(e) = p8 { return Err(e); } | |
93 | let p16 = self.read_u16le(); | |
94 | if let Err(e) = p16 { return Err(e); } | |
95 | Ok(((p16.unwrap() as u32) << 8) | (p8.unwrap() as u32)) | |
96 | } | |
97 | ||
98 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { | |
99 | read_int!(self, u32, 4, to_le) | |
100 | } | |
101 | ||
102 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { | |
103 | read_int!(self, u64, 8, to_le) | |
104 | } | |
105 | ||
106 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> { | |
107 | if self.io.is_seekable() { | |
108 | self.io.seek(SeekFrom::Current(len as i64))?; | |
109 | } else { | |
110 | let mut ssize = len; | |
111 | let mut buf : [u8; 16] = [0; 16]; | |
112 | let mut bref = &mut buf; | |
113 | while ssize > bref.len() { | |
114 | self.io.read_buf(bref)?; | |
115 | ssize -= bref.len(); | |
116 | } | |
117 | while ssize > 0 { | |
118 | self.io.read_byte()?; | |
119 | ssize = ssize - 1; | |
120 | } | |
121 | } | |
122 | Ok(()) | |
123 | } | |
124 | ||
125 | pub fn tell(&mut self) -> u64 { | |
126 | self.io.tell() | |
127 | } | |
128 | ||
129 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
130 | self.io.seek(pos) | |
131 | } | |
132 | ||
133 | pub fn is_eof(&mut self) -> bool { | |
134 | self.io.is_eof() | |
135 | } | |
136 | } | |
137 | ||
138 | impl<'a> MemoryReader<'a> { | |
139 | ||
140 | pub fn new_read(buf: &'a [u8]) -> Self { | |
141 | MemoryReader { buf: buf, size: buf.len(), pos: 0, do_write: false } | |
142 | } | |
143 | ||
144 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
145 | if pos < 0 || (pos as usize) > self.size { | |
146 | return Err(ByteIOError::WrongRange) | |
147 | } | |
148 | self.pos = pos as usize; | |
149 | Ok(pos as u64) | |
150 | } | |
151 | ||
152 | fn check_read_perm(&self) -> ByteIOResult<()> { | |
153 | if self.do_write { | |
154 | Err(ByteIOError::WrongIOMode) | |
155 | } else { | |
156 | Ok(()) | |
157 | } | |
158 | } | |
159 | ||
160 | fn check_write_perm(&self) -> ByteIOResult<()> { | |
161 | if !self.do_write { | |
162 | Err(ByteIOError::WrongIOMode) | |
163 | } else { | |
164 | Ok(()) | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
169 | impl<'a> ByteIO for MemoryReader<'a> { | |
170 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
171 | self.check_read_perm()?; | |
172 | if self.is_eof() { return Err(ByteIOError::EOF); } | |
173 | let res = self.buf[self.pos]; | |
174 | self.pos = self.pos + 1; | |
175 | Ok(res) | |
176 | } | |
177 | ||
178 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
179 | self.check_read_perm()?; | |
180 | let copy_size = if self.size - self.pos < buf.len() { self.size } else { buf.len() }; | |
181 | if copy_size == 0 { return Err(ByteIOError::EOF); } | |
182 | for i in 0..copy_size { | |
183 | buf[i] = self.buf[self.pos + i]; | |
184 | } | |
185 | self.pos += copy_size; | |
186 | Ok(copy_size) | |
187 | } | |
188 | ||
189 | #[allow(unused_variables)] | |
190 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> { | |
191 | self.check_write_perm()?; | |
192 | Err(ByteIOError::NotImplemented) | |
193 | } | |
194 | ||
195 | fn tell(&mut self) -> u64 { | |
196 | self.pos as u64 | |
197 | } | |
198 | ||
199 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
200 | let cur_pos = self.pos as i64; | |
201 | let cur_size = self.size as i64; | |
202 | match pos { | |
203 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
204 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
205 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
206 | } | |
207 | } | |
208 | ||
209 | fn is_eof(&mut self) -> bool { | |
210 | self.pos >= self.size | |
211 | } | |
212 | ||
213 | fn is_seekable(&mut self) -> bool { | |
214 | true | |
215 | } | |
216 | } | |
217 | ||
218 | impl<'a> FileReader<'a> { | |
219 | ||
220 | pub fn new_read(file: &'a mut File) -> Self { | |
221 | FileReader { file: file, eof : false } | |
222 | } | |
223 | } | |
224 | ||
225 | impl<'a> ByteIO for FileReader<'a> { | |
226 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
227 | let mut byte : [u8; 1] = [0]; | |
228 | let err = self.file.read(&mut byte); | |
229 | if let Err(_) = err { return Err(ByteIOError::ReadError); } | |
230 | let sz = err.unwrap(); | |
231 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } | |
232 | Ok (byte[0]) | |
233 | } | |
234 | ||
235 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
236 | let res = self.file.read(buf); | |
237 | if let Err(_) = res { return Err(ByteIOError::ReadError); } | |
238 | let sz = res.unwrap(); | |
239 | if sz < buf.len() { self.eof = true; } | |
240 | Ok(sz) | |
241 | } | |
242 | ||
243 | #[allow(unused_variables)] | |
244 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> { | |
245 | Err(ByteIOError::NotImplemented) | |
246 | } | |
247 | ||
248 | fn tell(&mut self) -> u64 { | |
249 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
250 | } | |
251 | ||
252 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
253 | let res = self.file.seek(pos); | |
254 | match res { | |
255 | Ok(r) => Ok(r), | |
256 | Err(_) => Err(ByteIOError::SeekError), | |
257 | } | |
258 | } | |
259 | ||
260 | fn is_eof(&mut self) -> bool { | |
261 | self.eof | |
262 | } | |
263 | ||
264 | fn is_seekable(&mut self) -> bool { | |
265 | true | |
266 | } | |
267 | } | |
268 | ||
269 | #[cfg(test)] | |
270 | mod test { | |
271 | use super::*; | |
272 | use std::fs::File; | |
273 | ||
274 | #[test] | |
275 | fn test_read() { | |
276 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); | |
277 | let buf: [u8; 64] = [1; 64]; | |
278 | let mut mr = MemoryReader::new_read(&buf); | |
279 | let mut reader = ByteReader::new(&mut mr); | |
280 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); | |
281 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); | |
282 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); | |
283 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); | |
284 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); | |
285 | let mut file = File::open("assets/MaoMacha.asx").unwrap(); | |
286 | let mut fr = FileReader::new_read(&mut file); | |
287 | let mut br2 = ByteReader::new(&mut fr); | |
288 | assert_eq!(br2.read_byte().unwrap(), 0x30); | |
289 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); | |
290 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); | |
291 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); | |
292 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); | |
293 | } | |
294 | #[test] | |
295 | fn test_write() { | |
296 | } | |
297 | } |