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1 | //! Bytestream reading/writing functionality. | |
2 | pub use std::io::SeekFrom; | |
3 | use std::io::prelude::*; | |
4 | use std::ptr; | |
5 | ||
6 | /// A list specifying general bytestream reading and writing errors. | |
7 | #[derive(Debug)] | |
8 | pub enum ByteIOError { | |
9 | /// End of stream. | |
10 | EOF, | |
11 | /// Wrong seek position was provided. | |
12 | WrongRange, | |
13 | /// Tried to call read() on bytestream writer or write() on bytestream reader. | |
14 | WrongIOMode, | |
15 | /// Functionality is not implemented. | |
16 | NotImplemented, | |
17 | /// Read error. | |
18 | ReadError, | |
19 | /// Write error. | |
20 | WriteError, | |
21 | /// Seeking failed. | |
22 | SeekError, | |
23 | } | |
24 | ||
25 | /// A specialised `Result` type for bytestream operations. | |
26 | pub type ByteIOResult<T> = Result<T, ByteIOError>; | |
27 | ||
28 | /// Common trait for bytestream operations. | |
29 | pub trait ByteIO { | |
30 | /// Reads data into provided buffer. Fails if it cannot fill whole buffer. | |
31 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; | |
32 | /// Reads data into provided buffer. Partial read is treated as success. | |
33 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; | |
34 | /// Reads data into provided buffer but does not advance read position. | |
35 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; | |
36 | /// Reads single byte from the stream. | |
37 | fn read_byte(&mut self) -> ByteIOResult<u8>; | |
38 | /// Returns the next byte value in the stream without advancing read position. | |
39 | fn peek_byte(&mut self) -> ByteIOResult<u8>; | |
40 | /// Writes buffer to the stream. | |
41 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()>; | |
42 | /// Returns current read or write position. | |
43 | fn tell(&mut self) -> u64; | |
44 | /// Seeks to the provided position. | |
45 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>; | |
46 | /// Tells whether this is end of stream. | |
47 | fn is_eof(&self) -> bool; | |
48 | /// Reports whether stream is seekable or not. | |
49 | fn is_seekable(&mut self) -> bool; | |
50 | /// Returns stream size or -1 if it is not known. | |
51 | fn size(&mut self) -> i64; | |
52 | /// Flushes output if possible. | |
53 | fn flush(&mut self) -> ByteIOResult<()>; | |
54 | } | |
55 | ||
56 | /// High-level bytestream reader. | |
57 | /// | |
58 | /// User is supposed to create some reader implementing [`ByteIO`] trait e.g. [`MemoryReader`] and use it to create `ByteReader` which can be used for reading e.g. various integer types. | |
59 | /// | |
60 | /// # Examples | |
61 | /// | |
62 | /// ```` | |
63 | /// use nihav_core::io::byteio::{MemoryReader,ByteReader}; | |
64 | /// # use nihav_core::io::byteio::ByteIOResult; | |
65 | /// | |
66 | /// # fn foo() -> ByteIOResult<()> { | |
67 | /// let memory: [u8; 4] = [ 0, 42, 42, 0 ]; | |
68 | /// let mut mr = MemoryReader::new_read(&memory); | |
69 | /// let mut br = ByteReader::new(&mut mr); | |
70 | /// let val = br.read_u16be()?; // read 16-bit big-endian integer, should be 42 | |
71 | /// let val = br.read_u16le()?; // read 16-bit little-endian integer, should be 42 as well | |
72 | /// # Ok(()) | |
73 | /// # } | |
74 | /// ```` | |
75 | /// | |
76 | /// [`ByteIO`]: ./trait.ByteIO.html | |
77 | /// [`MemoryReader`]: ./struct.MemoryReader.html | |
78 | #[allow(dead_code)] | |
79 | pub struct ByteReader<'a> { | |
80 | io: &'a mut dyn ByteIO, | |
81 | } | |
82 | ||
83 | /// Bytestream reader from memory. | |
84 | pub struct MemoryReader<'a> { | |
85 | buf: &'a [u8], | |
86 | pos: usize, | |
87 | } | |
88 | ||
89 | /// Bytestream reader from anything implementing `std::io::Read` and `std::io::Seek`. | |
90 | pub struct FileReader<T: Read+Seek> { | |
91 | file: Box<T>, | |
92 | eof: bool, | |
93 | } | |
94 | ||
95 | /// Bytestream reader from anything implementing `std::io::Read` and `std::io::Seek` that operates only on a part of the input. | |
96 | pub struct BoundedFileReader<T: Read+Seek> { | |
97 | file: Box<T>, | |
98 | start: u64, | |
99 | end: Option<u64>, | |
100 | eof: bool, | |
101 | } | |
102 | ||
103 | macro_rules! read_int { | |
104 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
105 | unsafe { | |
106 | let mut buf: $inttype = 0; | |
107 | $s.read_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; | |
108 | Ok(buf.$which()) | |
109 | } | |
110 | }) | |
111 | } | |
112 | ||
113 | macro_rules! peek_int { | |
114 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
115 | unsafe { | |
116 | let mut buf: $inttype = 0; | |
117 | $s.peek_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; | |
118 | Ok(buf.$which()) | |
119 | } | |
120 | }) | |
121 | } | |
122 | ||
123 | macro_rules! read_int_func { | |
124 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { | |
125 | /// Reads integer of certain size and endianness. | |
126 | pub fn $s(src: &[u8]) -> ByteIOResult<$inttype> { | |
127 | if src.len() < $size { return Err(ByteIOError::ReadError); } | |
128 | unsafe { | |
129 | let mut buf: $inttype = 0; | |
130 | ptr::copy_nonoverlapping(src.as_ptr(), &mut buf as *mut $inttype as *mut u8, std::mem::size_of::<$inttype>()); | |
131 | Ok(buf.$which()) | |
132 | } | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
137 | read_int_func!(read_u16be, u16, 2, to_be); | |
138 | read_int_func!(read_u16le, u16, 2, to_le); | |
139 | read_int_func!(read_u32be, u32, 4, to_be); | |
140 | read_int_func!(read_u32le, u32, 4, to_le); | |
141 | read_int_func!(read_u64be, u64, 8, to_be); | |
142 | read_int_func!(read_u64le, u64, 8, to_le); | |
143 | ||
144 | /// Reads 24-bit big-endian integer. | |
145 | /// | |
146 | /// # Example | |
147 | /// | |
148 | /// ```` | |
149 | /// use nihav_core::io::byteio::read_u24be; | |
150 | /// # use nihav_core::io::byteio::ByteIOResult; | |
151 | /// | |
152 | /// # fn foo() -> ByteIOResult<()> { | |
153 | /// let src: [u8; 3] = [ 1, 2, 3]; | |
154 | /// let value = read_u24be(&src)?; // should return 0x010203 | |
155 | /// # Ok(()) | |
156 | /// # } | |
157 | /// ```` | |
158 | pub fn read_u24be(src: &[u8]) -> ByteIOResult<u32> { | |
159 | if src.len() < 3 { return Err(ByteIOError::ReadError); } | |
160 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) | |
161 | } | |
162 | /// Reads 24-bit little-endian integer. | |
163 | pub fn read_u24le(src: &[u8]) -> ByteIOResult<u32> { | |
164 | if src.len() < 3 { return Err(ByteIOError::ReadError); } | |
165 | Ok((u32::from(src[2]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[0])) | |
166 | } | |
167 | /// Reads 32-bit big-endian floating point number. | |
168 | pub fn read_f32be(src: &[u8]) -> ByteIOResult<f32> { Ok(f32::from_bits(read_u32be(src)?)) } | |
169 | /// Reads 32-bit little-endian floating point number. | |
170 | pub fn read_f32le(src: &[u8]) -> ByteIOResult<f32> { Ok(f32::from_bits(read_u32le(src)?)) } | |
171 | /// Reads 64-bit big-endian floating point number. | |
172 | pub fn read_f64be(src: &[u8]) -> ByteIOResult<f64> { Ok(f64::from_bits(read_u64be(src)?)) } | |
173 | /// Reads 64-bit little-endian floating point number. | |
174 | pub fn read_f64le(src: &[u8]) -> ByteIOResult<f64> { Ok(f64::from_bits(read_u64le(src)?)) } | |
175 | ||
176 | macro_rules! write_int_func { | |
177 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { | |
178 | /// Writes integer of certain size and endianness into byte buffer. | |
179 | pub fn $s(dst: &mut [u8], val: $inttype) -> ByteIOResult<()> { | |
180 | if dst.len() < $size { return Err(ByteIOError::WriteError); } | |
181 | unsafe { | |
182 | let val = val.$which(); | |
183 | ptr::copy_nonoverlapping(&val as *const $inttype as *const u8, dst.as_mut_ptr(), std::mem::size_of::<$inttype>()); | |
184 | } | |
185 | Ok(()) | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
190 | write_int_func!(write_u16be, u16, 2, to_be); | |
191 | write_int_func!(write_u16le, u16, 2, to_le); | |
192 | write_int_func!(write_u32be, u32, 4, to_be); | |
193 | write_int_func!(write_u32le, u32, 4, to_le); | |
194 | write_int_func!(write_u64be, u64, 8, to_be); | |
195 | write_int_func!(write_u64le, u64, 8, to_le); | |
196 | ||
197 | /// Writes 24-bit big-endian integer to the provided buffer. | |
198 | /// | |
199 | /// # Example | |
200 | /// | |
201 | /// ```` | |
202 | /// use nihav_core::io::byteio::write_u24be; | |
203 | /// # use nihav_core::io::byteio::ByteIOResult; | |
204 | /// | |
205 | /// # fn foo() -> ByteIOResult<()> { | |
206 | /// let mut dst = [0u8; 3]; | |
207 | /// write_u24be(&mut dst, 0x010203)?; | |
208 | /// // dst should contain [ 1, 2, 3] now | |
209 | /// # Ok(()) | |
210 | /// # } | |
211 | /// ```` | |
212 | #[allow(clippy::identity_op)] | |
213 | pub fn write_u24be(dst: &mut [u8], val: u32) -> ByteIOResult<()> { | |
214 | if dst.len() < 3 { return Err(ByteIOError::WriteError); } | |
215 | dst[0] = (val >> 16) as u8; | |
216 | dst[1] = (val >> 8) as u8; | |
217 | dst[2] = (val >> 0) as u8; | |
218 | Ok(()) | |
219 | } | |
220 | /// Writes 24-bit little-endian integer to the provided buffer. | |
221 | #[allow(clippy::identity_op)] | |
222 | pub fn write_u24le(dst: &mut [u8], val: u32) -> ByteIOResult<()> { | |
223 | if dst.len() < 3 { return Err(ByteIOError::WriteError); } | |
224 | dst[0] = (val >> 0) as u8; | |
225 | dst[1] = (val >> 8) as u8; | |
226 | dst[2] = (val >> 16) as u8; | |
227 | Ok(()) | |
228 | } | |
229 | /// Writes 32-bit big-endian floating point number to the provided buffer. | |
230 | pub fn write_f32be(dst: &mut [u8], val: f32) -> ByteIOResult<()> { write_u32be(dst, val.to_bits()) } | |
231 | /// Writes 32-bit little-endian floating point number to the provided buffer. | |
232 | pub fn write_f32le(dst: &mut [u8], val: f32) -> ByteIOResult<()> { write_u32le(dst, val.to_bits()) } | |
233 | /// Writes 64-bit big-endian floating point number to the provided buffer. | |
234 | pub fn write_f64be(dst: &mut [u8], val: f64) -> ByteIOResult<()> { write_u64be(dst, val.to_bits()) } | |
235 | /// Writes 64-bit little-endian floating point number to the provided buffer. | |
236 | pub fn write_f64le(dst: &mut [u8], val: f64) -> ByteIOResult<()> { write_u64le(dst, val.to_bits()) } | |
237 | ||
238 | impl<'a> ByteReader<'a> { | |
239 | /// Constructs a new instance of bytestream reader. | |
240 | /// | |
241 | /// # Examples | |
242 | /// | |
243 | /// ```` | |
244 | /// use nihav_core::io::byteio::{MemoryReader,ByteReader}; | |
245 | /// # use nihav_core::io::byteio::ByteIOResult; | |
246 | /// | |
247 | /// # fn foo() -> ByteIOResult<()> { | |
248 | /// let memory: [u8; 4] = [ 0, 42, 42, 0 ]; | |
249 | /// let mut mr = MemoryReader::new_read(&memory); | |
250 | /// let mut br = ByteReader::new(&mut mr); | |
251 | /// # Ok(()) | |
252 | /// # } | |
253 | /// ```` | |
254 | pub fn new(io: &'a mut dyn ByteIO) -> Self { ByteReader { io } } | |
255 | ||
256 | /// Reads data into provided buffer. Partial read is treated as success. | |
257 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
258 | self.io.read_buf(buf) | |
259 | } | |
260 | ||
261 | /// Reads data into provided buffer. Partial read is treated as success. | |
262 | pub fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
263 | self.io.read_buf_some(buf) | |
264 | } | |
265 | ||
266 | /// Reads data into provided buffer but does not advance read position. | |
267 | pub fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
268 | self.io.peek_buf(buf) | |
269 | } | |
270 | ||
271 | /// Reads single byte from the stream. | |
272 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { | |
273 | self.io.read_byte() | |
274 | } | |
275 | ||
276 | /// Returns the next byte value in the stream without advancing read position. | |
277 | pub fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
278 | self.io.peek_byte() | |
279 | } | |
280 | ||
281 | /// Reads four-byte array from the stream. | |
282 | pub fn read_tag(&mut self) -> ByteIOResult<[u8; 4]> { | |
283 | let mut buf = [0u8; 4]; | |
284 | self.io.read_buf(&mut buf)?; | |
285 | Ok(buf) | |
286 | } | |
287 | ||
288 | /// Reads four-byte array from the stream without advancing read position. | |
289 | pub fn peek_tag(&mut self) -> ByteIOResult<[u8; 4]> { | |
290 | let mut buf = [0u8; 4]; | |
291 | self.io.peek_buf(&mut buf)?; | |
292 | Ok(buf) | |
293 | } | |
294 | ||
295 | /// Reads 16-bit big-endian integer from the stream. | |
296 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { | |
297 | read_int!(self, u16, 2, to_be) | |
298 | } | |
299 | ||
300 | /// Reads 16-bit big-endian integer from the stream without advancing read position. | |
301 | pub fn peek_u16be(&mut self) -> ByteIOResult<u16> { | |
302 | peek_int!(self, u16, 2, to_be) | |
303 | } | |
304 | ||
305 | /// Reads 24-bit big-endian integer from the stream. | |
306 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { | |
307 | let p16 = self.read_u16be()?; | |
308 | let p8 = self.read_byte()?; | |
309 | Ok((u32::from(p16) << 8) | u32::from(p8)) | |
310 | } | |
311 | ||
312 | /// Reads 24-bit big-endian integer from the stream without advancing read position. | |
313 | pub fn peek_u24be(&mut self) -> ByteIOResult<u32> { | |
314 | let mut src: [u8; 3] = [0; 3]; | |
315 | self.peek_buf(&mut src)?; | |
316 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) | |
317 | } | |
318 | ||
319 | /// Reads 32-bit big-endian integer from the stream. | |
320 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { | |
321 | read_int!(self, u32, 4, to_be) | |
322 | } | |
323 | ||
324 | /// Reads 32-bit big-endian integer from the stream without advancing read position. | |
325 | pub fn peek_u32be(&mut self) -> ByteIOResult<u32> { | |
326 | peek_int!(self, u32, 4, to_be) | |
327 | } | |
328 | ||
329 | /// Reads 64-bit big-endian integer from the stream. | |
330 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { | |
331 | read_int!(self, u64, 8, to_be) | |
332 | } | |
333 | ||
334 | /// Reads 64-bit big-endian integer from the stream without advancing read position. | |
335 | pub fn peek_u64be(&mut self) -> ByteIOResult<u64> { | |
336 | peek_int!(self, u64, 8, to_be) | |
337 | } | |
338 | ||
339 | /// Reads 32-bit big-endian floating point number from the stream. | |
340 | pub fn read_f32be(&mut self) -> ByteIOResult<f32> { | |
341 | Ok(f32::from_bits(self.read_u32be()?)) | |
342 | } | |
343 | ||
344 | /// Reads 32-bit big-endian floating point number from the stream without advancing read position. | |
345 | pub fn peek_f32be(&mut self) -> ByteIOResult<f32> { | |
346 | Ok(f32::from_bits(self.peek_u32be()?)) | |
347 | } | |
348 | ||
349 | /// Reads 64-bit big-endian floating point number from the stream. | |
350 | pub fn read_f64be(&mut self) -> ByteIOResult<f64> { | |
351 | Ok(f64::from_bits(self.read_u64be()?)) | |
352 | } | |
353 | ||
354 | /// Reads 64-bit big-endian floating point number from the stream without advancing read position. | |
355 | pub fn peek_f64be(&mut self) -> ByteIOResult<f64> { | |
356 | Ok(f64::from_bits(self.peek_u64be()?)) | |
357 | } | |
358 | ||
359 | /// Reads 16-bit little-endian integer from the stream. | |
360 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { | |
361 | read_int!(self, u16, 2, to_le) | |
362 | } | |
363 | ||
364 | /// Reads 16-bit little-endian integer from the stream without advancing read position. | |
365 | pub fn peek_u16le(&mut self) -> ByteIOResult<u16> { | |
366 | peek_int!(self, u16, 2, to_le) | |
367 | } | |
368 | ||
369 | /// Reads 24-bit little-endian integer from the stream. | |
370 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { | |
371 | let p8 = self.read_byte()?; | |
372 | let p16 = self.read_u16le()?; | |
373 | Ok((u32::from(p16) << 8) | u32::from(p8)) | |
374 | } | |
375 | ||
376 | /// Reads 24-bit little-endian integer from the stream without advancing read position. | |
377 | pub fn peek_u24le(&mut self) -> ByteIOResult<u32> { | |
378 | let mut src: [u8; 3] = [0; 3]; | |
379 | self.peek_buf(&mut src)?; | |
380 | Ok(u32::from(src[0]) | (u32::from(src[1]) << 8) | (u32::from(src[2]) << 16)) | |
381 | } | |
382 | ||
383 | /// Reads 32-bit little-endian integer from the stream. | |
384 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { | |
385 | read_int!(self, u32, 4, to_le) | |
386 | } | |
387 | ||
388 | /// Reads 32-bit little-endian integer from the stream without advancing read position. | |
389 | pub fn peek_u32le(&mut self) -> ByteIOResult<u32> { | |
390 | peek_int!(self, u32, 4, to_le) | |
391 | } | |
392 | ||
393 | /// Reads 64-bit little-endian integer from the stream. | |
394 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { | |
395 | read_int!(self, u64, 8, to_le) | |
396 | } | |
397 | ||
398 | /// Reads 64-bit little-endian integer from the stream without advancing read position. | |
399 | pub fn peek_u64le(&mut self) -> ByteIOResult<u64> { | |
400 | peek_int!(self, u64, 8, to_le) | |
401 | } | |
402 | ||
403 | /// Reads 32-bit little-endian floating point number from the stream. | |
404 | pub fn read_f32le(&mut self) -> ByteIOResult<f32> { | |
405 | Ok(f32::from_bits(self.read_u32le()?)) | |
406 | } | |
407 | ||
408 | /// Reads 32-bit little-endian floating point number from the stream without advancing read position. | |
409 | pub fn peek_f32le(&mut self) -> ByteIOResult<f32> { | |
410 | Ok(f32::from_bits(self.peek_u32le()?)) | |
411 | } | |
412 | ||
413 | /// Reads 64-bit little-endian floating point number from the stream. | |
414 | pub fn read_f64le(&mut self) -> ByteIOResult<f64> { | |
415 | Ok(f64::from_bits(self.read_u64le()?)) | |
416 | } | |
417 | ||
418 | /// Reads 64-bit little-endian floating point number from the stream without advancing read position. | |
419 | pub fn peek_f64le(&mut self) -> ByteIOResult<f64> { | |
420 | Ok(f64::from_bits(self.peek_u64le()?)) | |
421 | } | |
422 | ||
423 | /// Skips requested number of bytes. | |
424 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> { | |
425 | if self.io.is_seekable() { | |
426 | self.io.seek(SeekFrom::Current(len as i64))?; | |
427 | } else { | |
428 | let mut ssize = len; | |
429 | let mut buf : [u8; 16] = [0; 16]; | |
430 | let bref = &mut buf; | |
431 | while ssize > bref.len() { | |
432 | self.io.read_buf(bref)?; | |
433 | ssize -= bref.len(); | |
434 | } | |
435 | while ssize > 0 { | |
436 | self.io.read_byte()?; | |
437 | ssize -= 1; | |
438 | } | |
439 | } | |
440 | Ok(()) | |
441 | } | |
442 | ||
443 | /// Returns current read position. | |
444 | pub fn tell(&mut self) -> u64 { | |
445 | self.io.tell() | |
446 | } | |
447 | ||
448 | /// Seeks to the provided position. | |
449 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
450 | self.io.seek(pos) | |
451 | } | |
452 | ||
453 | /// Tells whether this is end of stream. | |
454 | pub fn is_eof(&self) -> bool { | |
455 | self.io.is_eof() | |
456 | } | |
457 | ||
458 | /// Returns stream size or -1 if it is not known. | |
459 | pub fn size(&mut self) -> i64 { | |
460 | self.io.size() | |
461 | } | |
462 | ||
463 | /// Reports number of bytes left in the stream. | |
464 | pub fn left(&mut self) -> i64 { | |
465 | let size = self.io.size(); | |
466 | if size == -1 { return -1; } | |
467 | size - (self.io.tell() as i64) | |
468 | } | |
469 | } | |
470 | ||
471 | impl<'a> MemoryReader<'a> { | |
472 | /// Constructs a new instance of `MemoryReader`. | |
473 | pub fn new_read(buf: &'a [u8]) -> Self { | |
474 | MemoryReader { buf, pos: 0 } | |
475 | } | |
476 | ||
477 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
478 | if pos < 0 || (pos as usize) > self.buf.len() { | |
479 | return Err(ByteIOError::WrongRange); | |
480 | } | |
481 | self.pos = pos as usize; | |
482 | Ok(pos as u64) | |
483 | } | |
484 | } | |
485 | ||
486 | impl<'a> ByteIO for MemoryReader<'a> { | |
487 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
488 | if self.is_eof() { return Err(ByteIOError::EOF); } | |
489 | let res = self.buf[self.pos]; | |
490 | self.pos += 1; | |
491 | Ok(res) | |
492 | } | |
493 | ||
494 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
495 | if self.is_eof() { return Err(ByteIOError::EOF); } | |
496 | Ok(self.buf[self.pos]) | |
497 | } | |
498 | ||
499 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
500 | let copy_size = if self.buf.len() - self.pos < buf.len() { self.buf.len() - self.pos } else { buf.len() }; | |
501 | if copy_size == 0 { return Err(ByteIOError::EOF); } | |
502 | let dst = &mut buf[0..copy_size]; | |
503 | dst.copy_from_slice(&self.buf[self.pos..][..copy_size]); | |
504 | Ok(copy_size) | |
505 | } | |
506 | ||
507 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
508 | let read_size = self.peek_buf(buf)?; | |
509 | if read_size < buf.len() { return Err(ByteIOError::EOF); } | |
510 | self.pos += read_size; | |
511 | Ok(read_size) | |
512 | } | |
513 | ||
514 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
515 | let read_size = self.peek_buf(buf)?; | |
516 | self.pos += read_size; | |
517 | Ok(read_size) | |
518 | } | |
519 | ||
520 | #[allow(unused_variables)] | |
521 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
522 | Err(ByteIOError::NotImplemented) | |
523 | } | |
524 | ||
525 | fn tell(&mut self) -> u64 { | |
526 | self.pos as u64 | |
527 | } | |
528 | ||
529 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
530 | let cur_pos = self.pos as i64; | |
531 | let cur_size = self.buf.len() as i64; | |
532 | match pos { | |
533 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
534 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
535 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
536 | } | |
537 | } | |
538 | ||
539 | fn is_eof(&self) -> bool { | |
540 | self.pos >= self.buf.len() | |
541 | } | |
542 | ||
543 | fn is_seekable(&mut self) -> bool { | |
544 | true | |
545 | } | |
546 | ||
547 | fn size(&mut self) -> i64 { | |
548 | self.buf.len() as i64 | |
549 | } | |
550 | ||
551 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } | |
552 | } | |
553 | ||
554 | impl<T: Read+Seek> FileReader<T> { | |
555 | ||
556 | /// Constructs a new instance of `FileReader`. | |
557 | pub fn new_read(file: T) -> Self { | |
558 | FileReader { file: Box::new(file), eof : false } | |
559 | } | |
560 | /// Constructs a new instance of `FileReader` using a boxed resource. | |
561 | pub fn new_read_boxed(file: Box<T>) -> Self { | |
562 | FileReader { file, eof : false } | |
563 | } | |
564 | /// Destroys the reader and releases the reader resource for a further use. | |
565 | pub fn finish(self) -> Box<T> { self.file } | |
566 | } | |
567 | ||
568 | impl<T: Read+Seek> ByteIO for FileReader<T> { | |
569 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
570 | let mut byte : [u8; 1] = [0]; | |
571 | let ret = self.file.read(&mut byte); | |
572 | if ret.is_err() { return Err(ByteIOError::ReadError); } | |
573 | let sz = ret.unwrap(); | |
574 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } | |
575 | Ok (byte[0]) | |
576 | } | |
577 | ||
578 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
579 | let b = self.read_byte()?; | |
580 | self.seek(SeekFrom::Current(-1))?; | |
581 | Ok(b) | |
582 | } | |
583 | ||
584 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
585 | match self.file.read_exact(buf) { | |
586 | Ok(()) => Ok(buf.len()), | |
587 | Err(err) => { | |
588 | if err.kind() == std::io::ErrorKind::UnexpectedEof { | |
589 | self.eof = true; | |
590 | Err(ByteIOError::EOF) | |
591 | } else { | |
592 | Err(ByteIOError::ReadError) | |
593 | } | |
594 | }, | |
595 | } | |
596 | } | |
597 | ||
598 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
599 | let ret = self.file.read(buf); | |
600 | if ret.is_err() { return Err(ByteIOError::ReadError); } | |
601 | let sz = ret.unwrap(); | |
602 | if sz < buf.len() { | |
603 | if let Err(_err) = self.file.read_exact(&mut buf[sz..][..1]) { | |
604 | self.eof = true; | |
605 | if sz == 0 { | |
606 | return Err(ByteIOError::EOF); | |
607 | } | |
608 | } else { | |
609 | return Ok(sz + 1); | |
610 | } | |
611 | } | |
612 | Ok(sz) | |
613 | } | |
614 | ||
615 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
616 | let size = self.read_buf(buf)?; | |
617 | self.seek(SeekFrom::Current(-(size as i64)))?; | |
618 | Ok(size) | |
619 | } | |
620 | ||
621 | #[allow(unused_variables)] | |
622 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
623 | Err(ByteIOError::NotImplemented) | |
624 | } | |
625 | ||
626 | fn tell(&mut self) -> u64 { | |
627 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
628 | } | |
629 | ||
630 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
631 | let res = self.file.seek(pos); | |
632 | match res { | |
633 | Ok(r) => Ok(r), | |
634 | Err(_) => Err(ByteIOError::SeekError), | |
635 | } | |
636 | } | |
637 | ||
638 | fn is_eof(&self) -> bool { | |
639 | self.eof | |
640 | } | |
641 | ||
642 | fn is_seekable(&mut self) -> bool { | |
643 | true | |
644 | } | |
645 | ||
646 | fn size(&mut self) -> i64 { | |
647 | -1 | |
648 | } | |
649 | ||
650 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } | |
651 | } | |
652 | ||
653 | ||
654 | impl<T: Read+Seek> BoundedFileReader<T> { | |
655 | ||
656 | /// Constructs a new instance of `BoundedFileReader`. The reader pretends that data before `start` and after `end` (if set) does not exist. | |
657 | pub fn new_read(file: T, start: u64, end: Option<u64>) -> ByteIOResult<Self> { | |
658 | let mut file = Box::new(file); | |
659 | if let Some(epos) = end { | |
660 | if start > epos { | |
661 | return Err(ByteIOError::WrongRange); | |
662 | } | |
663 | } | |
664 | if start > 0 && file.seek(SeekFrom::Start(start)).is_err() { | |
665 | return Err(ByteIOError::SeekError); | |
666 | } | |
667 | Ok(Self { file, start, end, eof : false }) | |
668 | } | |
669 | /// Constructs a new instance of `BoundedFileReader` using a boxed resource. The reader pretends that data before `start` and after `end` (if set) does not exist. | |
670 | pub fn new_read_boxed(mut file: Box<T>, start: u64, end: Option<u64>) -> ByteIOResult<Self> { | |
671 | if let Some(epos) = end { | |
672 | if start > epos { | |
673 | return Err(ByteIOError::WrongRange); | |
674 | } | |
675 | } | |
676 | if start > 0 && file.seek(SeekFrom::Start(start)).is_err() { | |
677 | return Err(ByteIOError::SeekError); | |
678 | } | |
679 | Ok(Self { file, start, end, eof : false }) | |
680 | } | |
681 | /// Destroys the reader and releases the reader resource for a further use. | |
682 | pub fn finish(self) -> Box<T> { self.file } | |
683 | fn real_tell(&mut self) -> u64 { | |
684 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
685 | } | |
686 | fn max_read_len(&mut self, len: usize) -> usize { | |
687 | if let Some(epos) = self.end { | |
688 | (len as u64).min(epos - self.real_tell()) as usize | |
689 | } else { | |
690 | len | |
691 | } | |
692 | } | |
693 | } | |
694 | ||
695 | impl<T: Read+Seek> ByteIO for BoundedFileReader<T> { | |
696 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
697 | if let Some(epos) = self.end { | |
698 | if self.real_tell() >= epos { | |
699 | self.eof = true; | |
700 | return Err(ByteIOError::EOF); | |
701 | } | |
702 | } | |
703 | let mut byte : [u8; 1] = [0]; | |
704 | let ret = self.file.read(&mut byte); | |
705 | if ret.is_err() { return Err(ByteIOError::ReadError); } | |
706 | let sz = ret.unwrap(); | |
707 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } | |
708 | Ok (byte[0]) | |
709 | } | |
710 | ||
711 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
712 | let b = self.read_byte()?; | |
713 | if self.file.seek(SeekFrom::Current(-1)).is_err() { | |
714 | return Err(ByteIOError::SeekError); | |
715 | } | |
716 | Ok(b) | |
717 | } | |
718 | ||
719 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
720 | if let Some(epos) = self.end { | |
721 | if self.real_tell() >= epos { | |
722 | self.eof = true; | |
723 | return Err(ByteIOError::EOF); | |
724 | } | |
725 | } | |
726 | let len = self.max_read_len(buf.len()); | |
727 | match self.file.read_exact(&mut buf[..len]) { | |
728 | Ok(()) if len == buf.len() => Ok(buf.len()), | |
729 | Ok(()) => { | |
730 | self.eof = true; | |
731 | Err(ByteIOError::EOF) | |
732 | }, | |
733 | Err(err) => { | |
734 | if err.kind() == std::io::ErrorKind::UnexpectedEof { | |
735 | self.eof = true; | |
736 | Err(ByteIOError::EOF) | |
737 | } else { | |
738 | Err(ByteIOError::ReadError) | |
739 | } | |
740 | }, | |
741 | } | |
742 | } | |
743 | ||
744 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
745 | if let Some(epos) = self.end { | |
746 | if self.real_tell() >= epos { | |
747 | self.eof = true; | |
748 | return Err(ByteIOError::EOF); | |
749 | } | |
750 | } | |
751 | let len = self.max_read_len(buf.len()); | |
752 | let ret = self.file.read(&mut buf[..len]); | |
753 | if ret.is_err() { return Err(ByteIOError::ReadError); } | |
754 | let sz = ret.unwrap(); | |
755 | if sz < len { | |
756 | if let Err(_err) = self.file.read(&mut buf[sz..][..1]) { | |
757 | self.eof = true; | |
758 | if sz == 0 { | |
759 | return Err(ByteIOError::EOF); | |
760 | } | |
761 | } else { | |
762 | return Ok(sz + 1); | |
763 | } | |
764 | } | |
765 | Ok(sz) | |
766 | } | |
767 | ||
768 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
769 | let len = self.max_read_len(buf.len()); | |
770 | let size = self.read_buf(&mut buf[..len])?; | |
771 | if self.file.seek(SeekFrom::Current(-(size as i64))).is_err() { | |
772 | return Err(ByteIOError::SeekError); | |
773 | } | |
774 | Ok(size) | |
775 | } | |
776 | ||
777 | #[allow(unused_variables)] | |
778 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
779 | Err(ByteIOError::NotImplemented) | |
780 | } | |
781 | ||
782 | fn tell(&mut self) -> u64 { | |
783 | self.file.seek(SeekFrom::Current(0)).unwrap() - self.start | |
784 | } | |
785 | ||
786 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
787 | let res = match pos { | |
788 | SeekFrom::Start(off) => { | |
789 | let dpos = self.start + off; | |
790 | if let Some(epos) = self.end { | |
791 | if dpos > epos { | |
792 | return Err(ByteIOError::WrongRange); | |
793 | } | |
794 | } | |
795 | self.file.seek(SeekFrom::Start(dpos)) | |
796 | }, | |
797 | SeekFrom::Current(off) => { | |
798 | let dpos = (self.real_tell() as i64) + off; | |
799 | let end = self.end.unwrap_or(dpos as u64); | |
800 | if dpos < 0 || ((dpos as u64) < self.start) || ((dpos as u64) > end) { | |
801 | return Err(ByteIOError::WrongRange); | |
802 | } | |
803 | self.file.seek(pos) | |
804 | }, | |
805 | SeekFrom::End(off) => { | |
806 | if let Some(epos) = self.end { | |
807 | let dpos = (epos as i64) + off; | |
808 | if dpos < (self.start as i64) || ((dpos as u64) > epos) { | |
809 | return Err(ByteIOError::WrongRange); | |
810 | } | |
811 | self.file.seek(SeekFrom::Start(dpos as u64)) | |
812 | } else { | |
813 | self.file.seek(pos) | |
814 | } | |
815 | }, | |
816 | }; | |
817 | match res { | |
818 | Ok(r) => Ok(r), | |
819 | Err(_) => Err(ByteIOError::SeekError), | |
820 | } | |
821 | } | |
822 | ||
823 | fn is_eof(&self) -> bool { | |
824 | self.eof | |
825 | } | |
826 | ||
827 | fn is_seekable(&mut self) -> bool { | |
828 | true | |
829 | } | |
830 | ||
831 | fn size(&mut self) -> i64 { | |
832 | -1 | |
833 | } | |
834 | ||
835 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } | |
836 | } | |
837 | ||
838 | ||
839 | /// High-level bytestream writer. | |
840 | /// | |
841 | /// User is supposed to create some writer implementing [`ByteIO`] trait e.g. [`MemoryWriter`] and use it to create `ByteWriter` which can be used for writing e.g. various integer types. | |
842 | /// | |
843 | /// # Examples | |
844 | /// | |
845 | /// ```` | |
846 | /// use nihav_core::io::byteio::{MemoryWriter,ByteWriter}; | |
847 | /// # use nihav_core::io::byteio::ByteIOResult; | |
848 | /// | |
849 | /// # fn foo() -> ByteIOResult<()> { | |
850 | /// let mut memory = [0u8; 4]; | |
851 | /// let mut mw = MemoryWriter::new_write(&mut memory); | |
852 | /// let mut bw = ByteWriter::new(&mut mw); | |
853 | /// let val = bw.write_u16be(42)?; // memory should be [ 0, 42, 0, 0 ] | |
854 | /// let val = bw.write_u16le(42)?; // memory should be [ 0, 42, 42, 0 ] | |
855 | /// # Ok(()) | |
856 | /// # } | |
857 | /// ```` | |
858 | /// | |
859 | /// [`ByteIO`]: ./trait.ByteIO.html | |
860 | /// [`MemoryWriter`]: ./struct.MemoryWriter.html | |
861 | #[allow(dead_code)] | |
862 | pub struct ByteWriter<'a> { | |
863 | io: &'a mut dyn ByteIO, | |
864 | } | |
865 | ||
866 | /// Bytestream writer to memory. | |
867 | pub struct MemoryWriter<'a> { | |
868 | buf: &'a mut [u8], | |
869 | pos: usize, | |
870 | } | |
871 | ||
872 | /// Bytestream writer to anything implementing `std::io::Write` and `std::io::Seek`. | |
873 | pub struct FileWriter<T: Write+Seek> { | |
874 | file: Box<T>, | |
875 | } | |
876 | ||
877 | /// Bytestream writer to memory. | |
878 | /// | |
879 | /// Unlike [`MemoryWriter`] which writes to an array of fixed size, `GrowableMemoryWriter` grows output size when output size exceeds capacity. | |
880 | /// | |
881 | /// [`MemoryWriter`]: ./struct.MemoryWriter.html | |
882 | pub struct GrowableMemoryWriter<'a> { | |
883 | buf: &'a mut Vec<u8>, | |
884 | pos: usize, | |
885 | } | |
886 | ||
887 | impl<'a> ByteWriter<'a> { | |
888 | /// Constructs a new instance of `ByteWriter`. | |
889 | pub fn new(io: &'a mut dyn ByteIO) -> Self { ByteWriter { io } } | |
890 | ||
891 | /// Writes byte array to the output. | |
892 | pub fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
893 | self.io.write_buf(buf) | |
894 | } | |
895 | ||
896 | /// Writes single byte to the output. | |
897 | pub fn write_byte(&mut self, val: u8) -> ByteIOResult<()> { | |
898 | let buf: [u8; 1] = [val]; | |
899 | self.io.write_buf(&buf) | |
900 | } | |
901 | ||
902 | /// Writes 16-bit big-endian integer to the output. | |
903 | pub fn write_u16be(&mut self, val: u16) -> ByteIOResult<()> { | |
904 | let buf: [u8; 2] = [((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; | |
905 | self.io.write_buf(&buf) | |
906 | } | |
907 | ||
908 | /// Writes 16-bit little-endian integer to the output. | |
909 | pub fn write_u16le(&mut self, val: u16) -> ByteIOResult<()> { | |
910 | let buf: [u8; 2] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8]; | |
911 | self.io.write_buf(&buf) | |
912 | } | |
913 | ||
914 | /// Writes 24-bit big-endian integer to the output. | |
915 | pub fn write_u24be(&mut self, val: u32) -> ByteIOResult<()> { | |
916 | let buf: [u8; 3] = [((val >> 16) & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; | |
917 | self.write_buf(&buf) | |
918 | } | |
919 | ||
920 | /// Writes 24-bit little-endian integer to the output. | |
921 | pub fn write_u24le(&mut self, val: u32) -> ByteIOResult<()> { | |
922 | let buf: [u8; 3] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, ((val >> 16) & 0xFF) as u8]; | |
923 | self.write_buf(&buf) | |
924 | } | |
925 | ||
926 | /// Writes 32-bit big-endian integer to the output. | |
927 | pub fn write_u32be(&mut self, val: u32) -> ByteIOResult<()> { | |
928 | self.write_u16be(((val >> 16) & 0xFFFF) as u16)?; | |
929 | self.write_u16be((val & 0xFFFF) as u16) | |
930 | } | |
931 | ||
932 | /// Writes 32-bit little-endian integer to the output. | |
933 | pub fn write_u32le(&mut self, val: u32) -> ByteIOResult<()> { | |
934 | self.write_u16le((val & 0xFFFF) as u16)?; | |
935 | self.write_u16le(((val >> 16) & 0xFFFF) as u16) | |
936 | } | |
937 | ||
938 | /// Writes 64-bit big-endian integer to the output. | |
939 | pub fn write_u64be(&mut self, val: u64) -> ByteIOResult<()> { | |
940 | self.write_u32be((val >> 32) as u32)?; | |
941 | self.write_u32be(val as u32) | |
942 | } | |
943 | ||
944 | /// Writes 64-bit little-endian integer to the output. | |
945 | pub fn write_u64le(&mut self, val: u64) -> ByteIOResult<()> { | |
946 | self.write_u32le(val as u32)?; | |
947 | self.write_u32le((val >> 32) as u32) | |
948 | } | |
949 | ||
950 | /// Writes 32-bit big-endian floating point number to the output. | |
951 | pub fn write_f32be(&mut self, val: f32) -> ByteIOResult<()> { | |
952 | self.write_u32be(val.to_bits()) | |
953 | } | |
954 | ||
955 | /// Writes 32-bit little-endian floating point number to the output. | |
956 | pub fn write_f32le(&mut self, val: f32) -> ByteIOResult<()> { | |
957 | self.write_u32le(val.to_bits()) | |
958 | } | |
959 | ||
960 | /// Writes 64-bit big-endian floating point number to the output. | |
961 | pub fn write_f64be(&mut self, val: f64) -> ByteIOResult<()> { | |
962 | self.write_u64be(val.to_bits()) | |
963 | } | |
964 | ||
965 | /// Writes 64-bit little-endian floating point number to the output. | |
966 | pub fn write_f64le(&mut self, val: f64) -> ByteIOResult<()> { | |
967 | self.write_u64le(val.to_bits()) | |
968 | } | |
969 | ||
970 | /// Reports the current write position. | |
971 | pub fn tell(&mut self) -> u64 { | |
972 | self.io.tell() | |
973 | } | |
974 | ||
975 | /// Seeks to the requested position. | |
976 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
977 | self.io.seek(pos) | |
978 | } | |
979 | ||
980 | /// Reports the amount of bytes the writer can still write (-1 if unknown). | |
981 | pub fn size_left(&mut self) -> i64 { | |
982 | let sz = self.io.size(); | |
983 | if sz == -1 { return -1; } | |
984 | sz - (self.tell() as i64) | |
985 | } | |
986 | ||
987 | /// Flushes output stream if possible. | |
988 | pub fn flush(&mut self) -> ByteIOResult<()> { | |
989 | self.io.flush() | |
990 | } | |
991 | } | |
992 | ||
993 | impl<'a> MemoryWriter<'a> { | |
994 | ||
995 | /// Constructs a new instance of `MemoryWriter`. | |
996 | pub fn new_write(buf: &'a mut [u8]) -> Self { | |
997 | MemoryWriter { buf, pos: 0 } | |
998 | } | |
999 | ||
1000 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
1001 | if pos < 0 || (pos as usize) > self.buf.len() { | |
1002 | return Err(ByteIOError::WrongRange) | |
1003 | } | |
1004 | self.pos = pos as usize; | |
1005 | Ok(pos as u64) | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | impl<'a> ByteIO for MemoryWriter<'a> { | |
1010 | #[allow(unused_variables)] | |
1011 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
1012 | Err(ByteIOError::NotImplemented) | |
1013 | } | |
1014 | ||
1015 | #[allow(unused_variables)] | |
1016 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
1017 | Err(ByteIOError::NotImplemented) | |
1018 | } | |
1019 | ||
1020 | #[allow(unused_variables)] | |
1021 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1022 | Err(ByteIOError::NotImplemented) | |
1023 | } | |
1024 | ||
1025 | #[allow(unused_variables)] | |
1026 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1027 | Err(ByteIOError::NotImplemented) | |
1028 | } | |
1029 | ||
1030 | #[allow(unused_variables)] | |
1031 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1032 | Err(ByteIOError::NotImplemented) | |
1033 | } | |
1034 | ||
1035 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
1036 | if self.pos + buf.len() > self.buf.len() { return Err(ByteIOError::WriteError); } | |
1037 | self.buf[self.pos..][..buf.len()].copy_from_slice(buf); | |
1038 | self.pos += buf.len(); | |
1039 | Ok(()) | |
1040 | } | |
1041 | ||
1042 | fn tell(&mut self) -> u64 { | |
1043 | self.pos as u64 | |
1044 | } | |
1045 | ||
1046 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
1047 | let cur_pos = self.pos as i64; | |
1048 | let cur_size = self.buf.len() as i64; | |
1049 | match pos { | |
1050 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
1051 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
1052 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | fn is_eof(&self) -> bool { | |
1057 | self.pos >= self.buf.len() | |
1058 | } | |
1059 | ||
1060 | fn is_seekable(&mut self) -> bool { | |
1061 | true | |
1062 | } | |
1063 | ||
1064 | fn size(&mut self) -> i64 { | |
1065 | self.buf.len() as i64 | |
1066 | } | |
1067 | ||
1068 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } | |
1069 | } | |
1070 | ||
1071 | impl<'a> GrowableMemoryWriter<'a> { | |
1072 | ||
1073 | /// Constructs a new instance of `GrowableMemoryWriter`. | |
1074 | pub fn new_write(buf: &'a mut Vec<u8>) -> Self { | |
1075 | GrowableMemoryWriter { buf, pos: 0 } | |
1076 | } | |
1077 | ||
1078 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
1079 | if pos < 0 || (pos as usize) > self.buf.len() { | |
1080 | return Err(ByteIOError::WrongRange) | |
1081 | } | |
1082 | self.pos = pos as usize; | |
1083 | Ok(pos as u64) | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | impl<'a> ByteIO for GrowableMemoryWriter<'a> { | |
1088 | #[allow(unused_variables)] | |
1089 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
1090 | Err(ByteIOError::NotImplemented) | |
1091 | } | |
1092 | ||
1093 | #[allow(unused_variables)] | |
1094 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
1095 | Err(ByteIOError::NotImplemented) | |
1096 | } | |
1097 | ||
1098 | #[allow(unused_variables)] | |
1099 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1100 | Err(ByteIOError::NotImplemented) | |
1101 | } | |
1102 | ||
1103 | #[allow(unused_variables)] | |
1104 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1105 | Err(ByteIOError::NotImplemented) | |
1106 | } | |
1107 | ||
1108 | #[allow(unused_variables)] | |
1109 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1110 | Err(ByteIOError::NotImplemented) | |
1111 | } | |
1112 | ||
1113 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
1114 | if self.pos + buf.len() > self.buf.len() { | |
1115 | self.buf.resize(self.pos + buf.len(), 0); | |
1116 | } | |
1117 | self.buf[self.pos..][..buf.len()].copy_from_slice(buf); | |
1118 | self.pos += buf.len(); | |
1119 | Ok(()) | |
1120 | } | |
1121 | ||
1122 | fn tell(&mut self) -> u64 { | |
1123 | self.pos as u64 | |
1124 | } | |
1125 | ||
1126 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
1127 | let cur_pos = self.pos as i64; | |
1128 | let cur_size = self.buf.len() as i64; | |
1129 | match pos { | |
1130 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
1131 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
1132 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | fn is_eof(&self) -> bool { | |
1137 | self.pos >= self.buf.len() | |
1138 | } | |
1139 | ||
1140 | fn is_seekable(&mut self) -> bool { | |
1141 | true | |
1142 | } | |
1143 | ||
1144 | fn size(&mut self) -> i64 { | |
1145 | self.buf.len() as i64 | |
1146 | } | |
1147 | ||
1148 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } | |
1149 | } | |
1150 | ||
1151 | impl<T: Write+Seek> FileWriter<T> { | |
1152 | /// Constructs a new instance of `FileWriter`. | |
1153 | pub fn new_write(file: T) -> Self { | |
1154 | FileWriter { file: Box::new(file) } | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | impl<T: Write+Seek> ByteIO for FileWriter<T> { | |
1159 | #[allow(unused_variables)] | |
1160 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
1161 | Err(ByteIOError::NotImplemented) | |
1162 | } | |
1163 | ||
1164 | #[allow(unused_variables)] | |
1165 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
1166 | Err(ByteIOError::NotImplemented) | |
1167 | } | |
1168 | ||
1169 | #[allow(unused_variables)] | |
1170 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1171 | Err(ByteIOError::NotImplemented) | |
1172 | } | |
1173 | ||
1174 | #[allow(unused_variables)] | |
1175 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1176 | Err(ByteIOError::NotImplemented) | |
1177 | } | |
1178 | ||
1179 | #[allow(unused_variables)] | |
1180 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
1181 | Err(ByteIOError::NotImplemented) | |
1182 | } | |
1183 | ||
1184 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
1185 | match self.file.write_all(buf) { | |
1186 | Ok(()) => Ok(()), | |
1187 | Err(_) => Err(ByteIOError::WriteError), | |
1188 | } | |
1189 | } | |
1190 | ||
1191 | fn tell(&mut self) -> u64 { | |
1192 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
1193 | } | |
1194 | ||
1195 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
1196 | let res = self.file.seek(pos); | |
1197 | match res { | |
1198 | Ok(r) => Ok(r), | |
1199 | Err(_) => Err(ByteIOError::SeekError), | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | fn is_eof(&self) -> bool { | |
1204 | false | |
1205 | } | |
1206 | ||
1207 | fn is_seekable(&mut self) -> bool { | |
1208 | true | |
1209 | } | |
1210 | ||
1211 | fn size(&mut self) -> i64 { | |
1212 | -1 | |
1213 | } | |
1214 | ||
1215 | fn flush(&mut self) -> ByteIOResult<()> { | |
1216 | match self.file.flush() { | |
1217 | Ok(()) => Ok(()), | |
1218 | Err(_) => Err(ByteIOError::WriteError), | |
1219 | } | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | #[cfg(test)] | |
1224 | mod test { | |
1225 | use super::*; | |
1226 | use std::fs::File; | |
1227 | ||
1228 | #[test] | |
1229 | fn test_read() { | |
1230 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); | |
1231 | let buf: [u8; 64] = [1; 64]; | |
1232 | let mut mr = MemoryReader::new_read(&buf); | |
1233 | let mut reader = ByteReader::new(&mut mr); | |
1234 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); | |
1235 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); | |
1236 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); | |
1237 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); | |
1238 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); | |
1239 | let mut file = File::open("assets/Misc/MaoMacha.asx").unwrap(); | |
1240 | let mut fr = FileReader::new_read(&mut file); | |
1241 | let mut br2 = ByteReader::new(&mut fr); | |
1242 | assert_eq!(br2.read_byte().unwrap(), 0x30); | |
1243 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); | |
1244 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); | |
1245 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); | |
1246 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); | |
1247 | } | |
1248 | #[test] | |
1249 | fn test_write() { | |
1250 | let mut buf: [u8; 64] = [0; 64]; | |
1251 | { | |
1252 | let mut mw = MemoryWriter::new_write(&mut buf); | |
1253 | let mut bw = ByteWriter::new(&mut mw); | |
1254 | bw.write_byte(0x00).unwrap(); | |
1255 | bw.write_u16be(0x0102).unwrap(); | |
1256 | bw.write_u24be(0x030405).unwrap(); | |
1257 | bw.write_u32be(0x06070809).unwrap(); | |
1258 | bw.write_u64be(0x0A0B0C0D0E0F1011).unwrap(); | |
1259 | bw.write_byte(0x00).unwrap(); | |
1260 | bw.write_u16le(0x0201).unwrap(); | |
1261 | bw.write_u24le(0x050403).unwrap(); | |
1262 | bw.write_u32le(0x09080706).unwrap(); | |
1263 | bw.write_u64le(0x11100F0E0D0C0B0A).unwrap(); | |
1264 | assert_eq!(bw.size_left(), 28); | |
1265 | } | |
1266 | for i in 0..0x12 { | |
1267 | assert_eq!(buf[(i + 0x00) as usize], i); | |
1268 | assert_eq!(buf[(i + 0x12) as usize], i); | |
1269 | } | |
1270 | } | |
1271 | } |