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