]>
Commit | Line | Data |
---|---|---|
28884194 | 1 | //! Bytestream reading/writing functionality. |
37f2396b | 2 | pub use std::io::SeekFrom; |
90aa4e6b | 3 | use std::io::prelude::*; |
e243ceb4 | 4 | use std::ptr; |
90aa4e6b | 5 | |
28884194 | 6 | /// A list specifying general bytestream reading and writing errors. |
90aa4e6b KS |
7 | #[derive(Debug)] |
8 | pub enum ByteIOError { | |
28884194 | 9 | /// End of stream. |
90aa4e6b | 10 | EOF, |
28884194 | 11 | /// Wrong seek position was provided. |
90aa4e6b | 12 | WrongRange, |
28884194 | 13 | /// Tried to call read() on bytestream writer or write() on bytestream reader. |
90aa4e6b | 14 | WrongIOMode, |
28884194 | 15 | /// Functionality is not implemented. |
90aa4e6b | 16 | NotImplemented, |
28884194 | 17 | /// Read error. |
90aa4e6b | 18 | ReadError, |
28884194 | 19 | /// Write error. |
90aa4e6b | 20 | WriteError, |
28884194 | 21 | /// Seeking failed. |
90aa4e6b KS |
22 | SeekError, |
23 | } | |
24 | ||
28884194 | 25 | /// A specialised `Result` type for bytestream operations. |
296d86b2 | 26 | pub type ByteIOResult<T> = Result<T, ByteIOError>; |
90aa4e6b | 27 | |
28884194 | 28 | /// Common trait for bytestream operations. |
90aa4e6b | 29 | pub trait ByteIO { |
28884194 | 30 | /// Reads data into provided buffer. Fails if it cannot fill whole buffer. |
90aa4e6b | 31 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
28884194 | 32 | /// Reads data into provided buffer. Partial read is treated as success. |
89de616c | 33 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
28884194 | 34 | /// Reads data into provided buffer but does not advance read position. |
794364cf | 35 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
28884194 | 36 | /// Reads single byte from the stream. |
90aa4e6b | 37 | fn read_byte(&mut self) -> ByteIOResult<u8>; |
28884194 | 38 | /// Returns the next byte value in the stream without advancing read position. |
794364cf | 39 | fn peek_byte(&mut self) -> ByteIOResult<u8>; |
28884194 | 40 | /// Writes buffer to the stream. |
d532000c | 41 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()>; |
28884194 | 42 | /// Returns current read or write position. |
90aa4e6b | 43 | fn tell(&mut self) -> u64; |
28884194 | 44 | /// Seeks to the provided position. |
90aa4e6b | 45 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>; |
28884194 | 46 | /// Tells whether this is end of stream. |
e243ceb4 | 47 | fn is_eof(&self) -> bool; |
28884194 | 48 | /// Reports whether stream is seekable or not. |
90aa4e6b | 49 | fn is_seekable(&mut self) -> bool; |
28884194 | 50 | /// Returns stream size or -1 if it is not known. |
d532000c | 51 | fn size(&mut self) -> i64; |
90aa4e6b KS |
52 | } |
53 | ||
28884194 KS |
54 | /// High-level bytestream reader. |
55 | /// | |
56 | /// 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. | |
57 | /// | |
58 | /// # Examples | |
59 | /// | |
60 | /// ```` | |
61 | /// use nihav_core::io::byteio::{MemoryReader,ByteReader}; | |
62 | /// # use nihav_core::io::byteio::ByteIOResult; | |
63 | /// | |
64 | /// # fn foo() -> ByteIOResult<()> { | |
65 | /// let memory: [u8; 4] = [ 0, 42, 42, 0 ]; | |
66 | /// let mut mr = MemoryReader::new_read(&memory); | |
67 | /// let mut br = ByteReader::new(&mut mr); | |
68 | /// let val = br.read_u16be()?; // read 16-bit big-endian integer, should be 42 | |
69 | /// let val = br.read_u16le()?; // read 16-bit little-endian integer, should be 42 as well | |
70 | /// # Ok(()) | |
71 | /// # } | |
72 | /// ```` | |
73 | /// | |
74 | /// [`ByteIO`]: ./trait.ByteIO.html | |
75 | /// [`MemoryReader`]: ./struct.MemoryReader.html | |
90aa4e6b KS |
76 | #[allow(dead_code)] |
77 | pub struct ByteReader<'a> { | |
ac818eac | 78 | io: &'a mut dyn ByteIO, |
90aa4e6b KS |
79 | } |
80 | ||
28884194 | 81 | /// Bytestream reader from memory. |
90aa4e6b KS |
82 | pub struct MemoryReader<'a> { |
83 | buf: &'a [u8], | |
90aa4e6b | 84 | pos: usize, |
90aa4e6b KS |
85 | } |
86 | ||
789354a8 KS |
87 | /// Bytestream reader from anything implementing `std::io::Read` and `std::io::Seek`. |
88 | pub struct FileReader<T: Read+Seek> { | |
89 | file: Box<T>, | |
90aa4e6b KS |
90 | eof: bool, |
91 | } | |
92 | ||
93 | macro_rules! read_int { | |
94 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
90aa4e6b | 95 | unsafe { |
e243ceb4 KS |
96 | let mut buf: $inttype = 0; |
97 | $s.read_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; | |
98 | Ok(buf.$which()) | |
90aa4e6b KS |
99 | } |
100 | }) | |
101 | } | |
102 | ||
794364cf KS |
103 | macro_rules! peek_int { |
104 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ | |
794364cf | 105 | unsafe { |
e243ceb4 KS |
106 | let mut buf: $inttype = 0; |
107 | $s.peek_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; | |
108 | Ok(buf.$which()) | |
794364cf KS |
109 | } |
110 | }) | |
111 | } | |
112 | ||
95058bc1 KS |
113 | macro_rules! read_int_func { |
114 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { | |
28884194 | 115 | /// Reads integer of certain size and endianness. |
95058bc1 KS |
116 | pub fn $s(src: &[u8]) -> ByteIOResult<$inttype> { |
117 | if src.len() < $size { return Err(ByteIOError::ReadError); } | |
118 | unsafe { | |
e243ceb4 | 119 | let mut buf: $inttype = 0; |
c9087a4c | 120 | ptr::copy_nonoverlapping(src.as_ptr(), &mut buf as *mut $inttype as *mut u8, std::mem::size_of::<$inttype>()); |
e243ceb4 | 121 | Ok(buf.$which()) |
95058bc1 KS |
122 | } |
123 | } | |
124 | } | |
125 | } | |
126 | ||
127 | read_int_func!(read_u16be, u16, 2, to_be); | |
128 | read_int_func!(read_u16le, u16, 2, to_le); | |
129 | read_int_func!(read_u32be, u32, 4, to_be); | |
130 | read_int_func!(read_u32le, u32, 4, to_le); | |
131 | read_int_func!(read_u64be, u64, 8, to_be); | |
132 | read_int_func!(read_u64le, u64, 8, to_le); | |
133 | ||
28884194 KS |
134 | /// Reads 24-bit big-endian integer. |
135 | /// | |
136 | /// # Example | |
137 | /// | |
138 | /// ```` | |
139 | /// use nihav_core::io::byteio::read_u24be; | |
140 | /// # use nihav_core::io::byteio::ByteIOResult; | |
141 | /// | |
142 | /// # fn foo() -> ByteIOResult<()> { | |
143 | /// let src: [u8; 3] = [ 1, 2, 3]; | |
144 | /// let value = read_u24be(&src)?; // should return 0x010203 | |
145 | /// # Ok(()) | |
146 | /// # } | |
147 | /// ```` | |
95058bc1 KS |
148 | pub fn read_u24be(src: &[u8]) -> ByteIOResult<u32> { |
149 | if src.len() < 3 { return Err(ByteIOError::ReadError); } | |
e243ceb4 | 150 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) |
95058bc1 | 151 | } |
28884194 | 152 | /// Reads 24-bit little-endian integer. |
95058bc1 KS |
153 | pub fn read_u24le(src: &[u8]) -> ByteIOResult<u32> { |
154 | if src.len() < 3 { return Err(ByteIOError::ReadError); } | |
e243ceb4 | 155 | Ok((u32::from(src[2]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[0])) |
95058bc1 | 156 | } |
28884194 | 157 | /// Reads 32-bit big-endian floating point number. |
02a5bdaf | 158 | pub fn read_f32be(src: &[u8]) -> ByteIOResult<f32> { Ok(f32::from_bits(read_u32be(src)?)) } |
28884194 | 159 | /// Reads 32-bit little-endian floating point number. |
02a5bdaf | 160 | pub fn read_f32le(src: &[u8]) -> ByteIOResult<f32> { Ok(f32::from_bits(read_u32le(src)?)) } |
28884194 | 161 | /// Reads 64-bit big-endian floating point number. |
02a5bdaf | 162 | pub fn read_f64be(src: &[u8]) -> ByteIOResult<f64> { Ok(f64::from_bits(read_u64be(src)?)) } |
28884194 | 163 | /// Reads 64-bit little-endian floating point number. |
02a5bdaf | 164 | pub fn read_f64le(src: &[u8]) -> ByteIOResult<f64> { Ok(f64::from_bits(read_u64le(src)?)) } |
95058bc1 | 165 | |
95c7f2f6 KS |
166 | macro_rules! write_int_func { |
167 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { | |
28884194 | 168 | /// Writes integer of certain size and endianness into byte buffer. |
95c7f2f6 KS |
169 | pub fn $s(dst: &mut [u8], val: $inttype) -> ByteIOResult<()> { |
170 | if dst.len() < $size { return Err(ByteIOError::WriteError); } | |
171 | unsafe { | |
172 | let val = val.$which(); | |
173 | ptr::copy_nonoverlapping(&val as *const $inttype as *const u8, dst.as_mut_ptr(), std::mem::size_of::<$inttype>()); | |
174 | } | |
175 | Ok(()) | |
176 | } | |
177 | } | |
178 | } | |
179 | ||
180 | write_int_func!(write_u16be, u16, 2, to_be); | |
181 | write_int_func!(write_u16le, u16, 2, to_le); | |
182 | write_int_func!(write_u32be, u32, 4, to_be); | |
183 | write_int_func!(write_u32le, u32, 4, to_le); | |
184 | write_int_func!(write_u64be, u64, 8, to_be); | |
185 | write_int_func!(write_u64le, u64, 8, to_le); | |
186 | ||
28884194 KS |
187 | /// Writes 24-bit big-endian integer to the provided buffer. |
188 | /// | |
189 | /// # Example | |
190 | /// | |
191 | /// ```` | |
192 | /// use nihav_core::io::byteio::write_u24be; | |
193 | /// # use nihav_core::io::byteio::ByteIOResult; | |
194 | /// | |
195 | /// # fn foo() -> ByteIOResult<()> { | |
196 | /// let mut dst = [0u8; 3]; | |
197 | /// write_u24be(&mut dst, 0x010203)?; | |
198 | /// // dst should contain [ 1, 2, 3] now | |
199 | /// # Ok(()) | |
200 | /// # } | |
201 | /// ```` | |
b36f412c | 202 | #[allow(clippy::identity_op)] |
95c7f2f6 KS |
203 | pub fn write_u24be(dst: &mut [u8], val: u32) -> ByteIOResult<()> { |
204 | if dst.len() < 3 { return Err(ByteIOError::WriteError); } | |
205 | dst[0] = (val >> 16) as u8; | |
206 | dst[1] = (val >> 8) as u8; | |
207 | dst[2] = (val >> 0) as u8; | |
208 | Ok(()) | |
209 | } | |
28884194 | 210 | /// Writes 24-bit little-endian integer to the provided buffer. |
b36f412c | 211 | #[allow(clippy::identity_op)] |
95c7f2f6 KS |
212 | pub fn write_u24le(dst: &mut [u8], val: u32) -> ByteIOResult<()> { |
213 | if dst.len() < 3 { return Err(ByteIOError::WriteError); } | |
214 | dst[0] = (val >> 0) as u8; | |
215 | dst[1] = (val >> 8) as u8; | |
216 | dst[2] = (val >> 16) as u8; | |
217 | Ok(()) | |
218 | } | |
28884194 | 219 | /// Writes 32-bit big-endian floating point number to the provided buffer. |
02a5bdaf | 220 | pub fn write_f32be(dst: &mut [u8], val: f32) -> ByteIOResult<()> { write_u32be(dst, val.to_bits()) } |
28884194 | 221 | /// Writes 32-bit little-endian floating point number to the provided buffer. |
02a5bdaf | 222 | pub fn write_f32le(dst: &mut [u8], val: f32) -> ByteIOResult<()> { write_u32le(dst, val.to_bits()) } |
28884194 | 223 | /// Writes 64-bit big-endian floating point number to the provided buffer. |
02a5bdaf | 224 | pub fn write_f64be(dst: &mut [u8], val: f64) -> ByteIOResult<()> { write_u64be(dst, val.to_bits()) } |
28884194 | 225 | /// Writes 64-bit little-endian floating point number to the provided buffer. |
02a5bdaf | 226 | pub fn write_f64le(dst: &mut [u8], val: f64) -> ByteIOResult<()> { write_u64le(dst, val.to_bits()) } |
95c7f2f6 | 227 | |
90aa4e6b | 228 | impl<'a> ByteReader<'a> { |
28884194 KS |
229 | /// Constructs a new instance of bytestream reader. |
230 | /// | |
231 | /// # Examples | |
232 | /// | |
233 | /// ```` | |
234 | /// use nihav_core::io::byteio::{MemoryReader,ByteReader}; | |
235 | /// # use nihav_core::io::byteio::ByteIOResult; | |
236 | /// | |
237 | /// # fn foo() -> ByteIOResult<()> { | |
238 | /// let memory: [u8; 4] = [ 0, 42, 42, 0 ]; | |
239 | /// let mut mr = MemoryReader::new_read(&memory); | |
240 | /// let mut br = ByteReader::new(&mut mr); | |
241 | /// # Ok(()) | |
242 | /// # } | |
243 | /// ```` | |
ac818eac | 244 | pub fn new(io: &'a mut dyn ByteIO) -> Self { ByteReader { io } } |
90aa4e6b | 245 | |
28884194 | 246 | /// Reads data into provided buffer. Partial read is treated as success. |
90aa4e6b KS |
247 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
248 | self.io.read_buf(buf) | |
249 | } | |
250 | ||
28884194 | 251 | /// Reads data into provided buffer. Partial read is treated as success. |
89de616c KS |
252 | pub fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
253 | self.io.read_buf_some(buf) | |
254 | } | |
255 | ||
28884194 | 256 | /// Reads data into provided buffer but does not advance read position. |
794364cf KS |
257 | pub fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
258 | self.io.peek_buf(buf) | |
259 | } | |
260 | ||
28884194 | 261 | /// Reads single byte from the stream. |
90aa4e6b KS |
262 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { |
263 | self.io.read_byte() | |
264 | } | |
265 | ||
28884194 | 266 | /// Returns the next byte value in the stream without advancing read position. |
794364cf KS |
267 | pub fn peek_byte(&mut self) -> ByteIOResult<u8> { |
268 | self.io.peek_byte() | |
269 | } | |
270 | ||
943d7b14 KS |
271 | /// Reads four-byte array from the stream. |
272 | pub fn read_tag(&mut self) -> ByteIOResult<[u8; 4]> { | |
273 | let mut buf = [0u8; 4]; | |
274 | self.io.read_buf(&mut buf)?; | |
275 | Ok(buf) | |
276 | } | |
277 | ||
278 | /// Reads four-byte array from the stream without advancing read position. | |
279 | pub fn peek_tag(&mut self) -> ByteIOResult<[u8; 4]> { | |
280 | let mut buf = [0u8; 4]; | |
281 | self.io.peek_buf(&mut buf)?; | |
282 | Ok(buf) | |
283 | } | |
284 | ||
28884194 | 285 | /// Reads 16-bit big-endian integer from the stream. |
90aa4e6b KS |
286 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { |
287 | read_int!(self, u16, 2, to_be) | |
288 | } | |
289 | ||
28884194 | 290 | /// Reads 16-bit big-endian integer from the stream without advancing read position. |
794364cf KS |
291 | pub fn peek_u16be(&mut self) -> ByteIOResult<u16> { |
292 | peek_int!(self, u16, 2, to_be) | |
293 | } | |
294 | ||
28884194 | 295 | /// Reads 24-bit big-endian integer from the stream. |
90aa4e6b | 296 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { |
794364cf KS |
297 | let p16 = self.read_u16be()?; |
298 | let p8 = self.read_byte()?; | |
e243ceb4 | 299 | Ok((u32::from(p16) << 8) | u32::from(p8)) |
794364cf KS |
300 | } |
301 | ||
28884194 | 302 | /// Reads 24-bit big-endian integer from the stream without advancing read position. |
794364cf KS |
303 | pub fn peek_u24be(&mut self) -> ByteIOResult<u32> { |
304 | let mut src: [u8; 3] = [0; 3]; | |
305 | self.peek_buf(&mut src)?; | |
e243ceb4 | 306 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) |
90aa4e6b KS |
307 | } |
308 | ||
28884194 | 309 | /// Reads 32-bit big-endian integer from the stream. |
90aa4e6b KS |
310 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { |
311 | read_int!(self, u32, 4, to_be) | |
312 | } | |
313 | ||
28884194 | 314 | /// Reads 32-bit big-endian integer from the stream without advancing read position. |
794364cf KS |
315 | pub fn peek_u32be(&mut self) -> ByteIOResult<u32> { |
316 | peek_int!(self, u32, 4, to_be) | |
317 | } | |
318 | ||
28884194 | 319 | /// Reads 64-bit big-endian integer from the stream. |
90aa4e6b KS |
320 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { |
321 | read_int!(self, u64, 8, to_be) | |
322 | } | |
323 | ||
28884194 | 324 | /// Reads 64-bit big-endian integer from the stream without advancing read position. |
794364cf KS |
325 | pub fn peek_u64be(&mut self) -> ByteIOResult<u64> { |
326 | peek_int!(self, u64, 8, to_be) | |
327 | } | |
328 | ||
28884194 | 329 | /// Reads 32-bit big-endian floating point number from the stream. |
02a5bdaf KS |
330 | pub fn read_f32be(&mut self) -> ByteIOResult<f32> { |
331 | Ok(f32::from_bits(self.read_u32be()?)) | |
332 | } | |
333 | ||
28884194 | 334 | /// Reads 32-bit big-endian floating point number from the stream without advancing read position. |
02a5bdaf KS |
335 | pub fn peek_f32be(&mut self) -> ByteIOResult<f32> { |
336 | Ok(f32::from_bits(self.peek_u32be()?)) | |
337 | } | |
338 | ||
28884194 | 339 | /// Reads 64-bit big-endian floating point number from the stream. |
02a5bdaf KS |
340 | pub fn read_f64be(&mut self) -> ByteIOResult<f64> { |
341 | Ok(f64::from_bits(self.read_u64be()?)) | |
342 | } | |
343 | ||
28884194 | 344 | /// Reads 64-bit big-endian floating point number from the stream without advancing read position. |
02a5bdaf KS |
345 | pub fn peek_f64be(&mut self) -> ByteIOResult<f64> { |
346 | Ok(f64::from_bits(self.peek_u64be()?)) | |
347 | } | |
348 | ||
28884194 | 349 | /// Reads 16-bit little-endian integer from the stream. |
90aa4e6b KS |
350 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { |
351 | read_int!(self, u16, 2, to_le) | |
352 | } | |
353 | ||
28884194 | 354 | /// Reads 16-bit little-endian integer from the stream without advancing read position. |
794364cf KS |
355 | pub fn peek_u16le(&mut self) -> ByteIOResult<u16> { |
356 | peek_int!(self, u16, 2, to_le) | |
357 | } | |
358 | ||
28884194 | 359 | /// Reads 24-bit little-endian integer from the stream. |
90aa4e6b | 360 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { |
794364cf KS |
361 | let p8 = self.read_byte()?; |
362 | let p16 = self.read_u16le()?; | |
e243ceb4 | 363 | Ok((u32::from(p16) << 8) | u32::from(p8)) |
794364cf KS |
364 | } |
365 | ||
28884194 | 366 | /// Reads 24-bit little-endian integer from the stream without advancing read position. |
794364cf KS |
367 | pub fn peek_u24le(&mut self) -> ByteIOResult<u32> { |
368 | let mut src: [u8; 3] = [0; 3]; | |
369 | self.peek_buf(&mut src)?; | |
e243ceb4 | 370 | Ok(u32::from(src[0]) | (u32::from(src[1]) << 8) | (u32::from(src[2]) << 16)) |
90aa4e6b KS |
371 | } |
372 | ||
28884194 | 373 | /// Reads 32-bit little-endian integer from the stream. |
90aa4e6b KS |
374 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { |
375 | read_int!(self, u32, 4, to_le) | |
376 | } | |
377 | ||
28884194 | 378 | /// Reads 32-bit little-endian integer from the stream without advancing read position. |
794364cf KS |
379 | pub fn peek_u32le(&mut self) -> ByteIOResult<u32> { |
380 | peek_int!(self, u32, 4, to_le) | |
381 | } | |
382 | ||
28884194 | 383 | /// Reads 64-bit little-endian integer from the stream. |
90aa4e6b KS |
384 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { |
385 | read_int!(self, u64, 8, to_le) | |
386 | } | |
387 | ||
28884194 | 388 | /// Reads 64-bit little-endian integer from the stream without advancing read position. |
794364cf KS |
389 | pub fn peek_u64le(&mut self) -> ByteIOResult<u64> { |
390 | peek_int!(self, u64, 8, to_le) | |
391 | } | |
392 | ||
28884194 | 393 | /// Reads 32-bit little-endian floating point number from the stream. |
02a5bdaf KS |
394 | pub fn read_f32le(&mut self) -> ByteIOResult<f32> { |
395 | Ok(f32::from_bits(self.read_u32le()?)) | |
396 | } | |
397 | ||
28884194 | 398 | /// Reads 32-bit little-endian floating point number from the stream without advancing read position. |
02a5bdaf KS |
399 | pub fn peek_f32le(&mut self) -> ByteIOResult<f32> { |
400 | Ok(f32::from_bits(self.peek_u32le()?)) | |
401 | } | |
402 | ||
28884194 | 403 | /// Reads 64-bit little-endian floating point number from the stream. |
02a5bdaf KS |
404 | pub fn read_f64le(&mut self) -> ByteIOResult<f64> { |
405 | Ok(f64::from_bits(self.read_u64le()?)) | |
406 | } | |
407 | ||
28884194 | 408 | /// Reads 64-bit little-endian floating point number from the stream without advancing read position. |
02a5bdaf KS |
409 | pub fn peek_f64le(&mut self) -> ByteIOResult<f64> { |
410 | Ok(f64::from_bits(self.peek_u64le()?)) | |
411 | } | |
412 | ||
28884194 | 413 | /// Skips requested number of bytes. |
6b167b0c | 414 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> { |
90aa4e6b KS |
415 | if self.io.is_seekable() { |
416 | self.io.seek(SeekFrom::Current(len as i64))?; | |
417 | } else { | |
418 | let mut ssize = len; | |
419 | let mut buf : [u8; 16] = [0; 16]; | |
9037cf6b | 420 | let bref = &mut buf; |
90aa4e6b KS |
421 | while ssize > bref.len() { |
422 | self.io.read_buf(bref)?; | |
423 | ssize -= bref.len(); | |
424 | } | |
425 | while ssize > 0 { | |
426 | self.io.read_byte()?; | |
e243ceb4 | 427 | ssize -= 1; |
90aa4e6b KS |
428 | } |
429 | } | |
6b167b0c | 430 | Ok(()) |
90aa4e6b KS |
431 | } |
432 | ||
28884194 | 433 | /// Returns current read position. |
90aa4e6b KS |
434 | pub fn tell(&mut self) -> u64 { |
435 | self.io.tell() | |
436 | } | |
437 | ||
28884194 | 438 | /// Seeks to the provided position. |
90aa4e6b KS |
439 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
440 | self.io.seek(pos) | |
441 | } | |
442 | ||
28884194 | 443 | /// Tells whether this is end of stream. |
e243ceb4 | 444 | pub fn is_eof(&self) -> bool { |
90aa4e6b KS |
445 | self.io.is_eof() |
446 | } | |
96c6be97 | 447 | |
28884194 | 448 | /// Returns stream size or -1 if it is not known. |
96c6be97 KS |
449 | pub fn size(&mut self) -> i64 { |
450 | self.io.size() | |
451 | } | |
452 | ||
28884194 | 453 | /// Reports number of bytes left in the stream. |
96c6be97 KS |
454 | pub fn left(&mut self) -> i64 { |
455 | let size = self.io.size(); | |
456 | if size == -1 { return -1; } | |
e243ceb4 | 457 | size - (self.io.tell() as i64) |
96c6be97 | 458 | } |
90aa4e6b KS |
459 | } |
460 | ||
461 | impl<'a> MemoryReader<'a> { | |
28884194 | 462 | /// Constructs a new instance of `MemoryReader`. |
90aa4e6b | 463 | pub fn new_read(buf: &'a [u8]) -> Self { |
1be85e00 | 464 | MemoryReader { buf, pos: 0 } |
90aa4e6b KS |
465 | } |
466 | ||
467 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
1be85e00 | 468 | if pos < 0 || (pos as usize) > self.buf.len() { |
e243ceb4 | 469 | return Err(ByteIOError::WrongRange); |
90aa4e6b KS |
470 | } |
471 | self.pos = pos as usize; | |
472 | Ok(pos as u64) | |
473 | } | |
90aa4e6b KS |
474 | } |
475 | ||
476 | impl<'a> ByteIO for MemoryReader<'a> { | |
477 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
90aa4e6b KS |
478 | if self.is_eof() { return Err(ByteIOError::EOF); } |
479 | let res = self.buf[self.pos]; | |
e243ceb4 | 480 | self.pos += 1; |
90aa4e6b KS |
481 | Ok(res) |
482 | } | |
483 | ||
794364cf KS |
484 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
485 | if self.is_eof() { return Err(ByteIOError::EOF); } | |
486 | Ok(self.buf[self.pos]) | |
487 | } | |
488 | ||
489 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
b2939bd8 | 490 | let copy_size = if self.buf.len() - self.pos < buf.len() { self.buf.len() - self.pos } else { buf.len() }; |
90aa4e6b | 491 | if copy_size == 0 { return Err(ByteIOError::EOF); } |
e243ceb4 KS |
492 | let dst = &mut buf[0..copy_size]; |
493 | dst.copy_from_slice(&self.buf[self.pos..][..copy_size]); | |
90aa4e6b KS |
494 | Ok(copy_size) |
495 | } | |
496 | ||
794364cf | 497 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
89de616c KS |
498 | let read_size = self.peek_buf(buf)?; |
499 | if read_size < buf.len() { return Err(ByteIOError::EOF); } | |
500 | self.pos += read_size; | |
501 | Ok(read_size) | |
502 | } | |
503 | ||
504 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
794364cf KS |
505 | let read_size = self.peek_buf(buf)?; |
506 | self.pos += read_size; | |
507 | Ok(read_size) | |
508 | } | |
509 | ||
90aa4e6b | 510 | #[allow(unused_variables)] |
d532000c | 511 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
90aa4e6b KS |
512 | Err(ByteIOError::NotImplemented) |
513 | } | |
514 | ||
515 | fn tell(&mut self) -> u64 { | |
516 | self.pos as u64 | |
517 | } | |
518 | ||
519 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
1be85e00 KS |
520 | let cur_pos = self.pos as i64; |
521 | let cur_size = self.buf.len() as i64; | |
90aa4e6b KS |
522 | match pos { |
523 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
524 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
525 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
526 | } | |
527 | } | |
528 | ||
e243ceb4 | 529 | fn is_eof(&self) -> bool { |
1be85e00 | 530 | self.pos >= self.buf.len() |
90aa4e6b KS |
531 | } |
532 | ||
533 | fn is_seekable(&mut self) -> bool { | |
534 | true | |
535 | } | |
d532000c KS |
536 | |
537 | fn size(&mut self) -> i64 { | |
538 | self.buf.len() as i64 | |
539 | } | |
90aa4e6b KS |
540 | } |
541 | ||
789354a8 | 542 | impl<T: Read+Seek> FileReader<T> { |
90aa4e6b | 543 | |
28884194 | 544 | /// Constructs a new instance of `FileReader`. |
789354a8 KS |
545 | pub fn new_read(file: T) -> Self { |
546 | FileReader { file: Box::new(file), eof : false } | |
90aa4e6b KS |
547 | } |
548 | } | |
549 | ||
789354a8 | 550 | impl<T: Read+Seek> ByteIO for FileReader<T> { |
90aa4e6b KS |
551 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
552 | let mut byte : [u8; 1] = [0]; | |
e243ceb4 KS |
553 | let ret = self.file.read(&mut byte); |
554 | if ret.is_err() { return Err(ByteIOError::ReadError); } | |
555 | let sz = ret.unwrap(); | |
90aa4e6b KS |
556 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } |
557 | Ok (byte[0]) | |
558 | } | |
559 | ||
794364cf KS |
560 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
561 | let b = self.read_byte()?; | |
562 | self.seek(SeekFrom::Current(-1))?; | |
563 | Ok(b) | |
564 | } | |
565 | ||
90aa4e6b | 566 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
6c0356da KS |
567 | match self.file.read_exact(buf) { |
568 | Ok(()) => Ok(buf.len()), | |
569 | Err(err) => { | |
570 | if err.kind() == std::io::ErrorKind::UnexpectedEof { | |
571 | self.eof = true; | |
572 | Err(ByteIOError::EOF) | |
573 | } else { | |
574 | Err(ByteIOError::ReadError) | |
575 | } | |
576 | }, | |
577 | } | |
89de616c KS |
578 | } |
579 | ||
580 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
e243ceb4 KS |
581 | let ret = self.file.read(buf); |
582 | if ret.is_err() { return Err(ByteIOError::ReadError); } | |
583 | let sz = ret.unwrap(); | |
6c0356da KS |
584 | if sz < buf.len() { |
585 | if let Err(_err) = self.file.read(&mut buf[sz..][..1]) { | |
586 | self.eof = true; | |
587 | } else { | |
588 | return Ok(sz + 1); | |
589 | } | |
590 | } | |
90aa4e6b KS |
591 | Ok(sz) |
592 | } | |
593 | ||
794364cf KS |
594 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
595 | let size = self.read_buf(buf)?; | |
596 | self.seek(SeekFrom::Current(-(size as i64)))?; | |
597 | Ok(size) | |
598 | } | |
599 | ||
90aa4e6b | 600 | #[allow(unused_variables)] |
d532000c | 601 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
90aa4e6b KS |
602 | Err(ByteIOError::NotImplemented) |
603 | } | |
604 | ||
605 | fn tell(&mut self) -> u64 { | |
606 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
607 | } | |
608 | ||
609 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
610 | let res = self.file.seek(pos); | |
611 | match res { | |
612 | Ok(r) => Ok(r), | |
613 | Err(_) => Err(ByteIOError::SeekError), | |
614 | } | |
615 | } | |
616 | ||
e243ceb4 | 617 | fn is_eof(&self) -> bool { |
90aa4e6b KS |
618 | self.eof |
619 | } | |
620 | ||
621 | fn is_seekable(&mut self) -> bool { | |
622 | true | |
623 | } | |
d532000c KS |
624 | |
625 | fn size(&mut self) -> i64 { | |
626 | -1 | |
627 | } | |
628 | } | |
629 | ||
28884194 KS |
630 | /// High-level bytestream writer. |
631 | /// | |
632 | /// 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. | |
633 | /// | |
634 | /// # Examples | |
635 | /// | |
636 | /// ```` | |
637 | /// use nihav_core::io::byteio::{MemoryWriter,ByteWriter}; | |
638 | /// # use nihav_core::io::byteio::ByteIOResult; | |
639 | /// | |
640 | /// # fn foo() -> ByteIOResult<()> { | |
641 | /// let mut memory = [0u8; 4]; | |
642 | /// let mut mw = MemoryWriter::new_write(&mut memory); | |
643 | /// let mut bw = ByteWriter::new(&mut mw); | |
644 | /// let val = bw.write_u16be(42)?; // memory should be [ 0, 42, 0, 0 ] | |
645 | /// let val = bw.write_u16le(42)?; // memory should be [ 0, 42, 42, 0 ] | |
646 | /// # Ok(()) | |
647 | /// # } | |
648 | /// ```` | |
649 | /// | |
650 | /// [`ByteIO`]: ./trait.ByteIO.html | |
651 | /// [`MemoryWriter`]: ./struct.MemoryWriter.html | |
d532000c KS |
652 | #[allow(dead_code)] |
653 | pub struct ByteWriter<'a> { | |
ac818eac | 654 | io: &'a mut dyn ByteIO, |
d532000c KS |
655 | } |
656 | ||
28884194 | 657 | /// Bytestream writer to memory. |
d532000c KS |
658 | pub struct MemoryWriter<'a> { |
659 | buf: &'a mut [u8], | |
d532000c KS |
660 | pos: usize, |
661 | } | |
662 | ||
789354a8 KS |
663 | /// Bytestream writer to anything implementing `std::io::Write` and `std::io::Seek`. |
664 | pub struct FileWriter<T: Write+Seek> { | |
665 | file: Box<T>, | |
d532000c KS |
666 | } |
667 | ||
422e87e4 KS |
668 | /// Bytestream writer to memory. |
669 | /// | |
670 | /// Unlike [`MemoryWriter`] which writes to an array of fixed size, `GrowableMemoryWriter` grows output size when output size exceeds capacity. | |
671 | /// | |
672 | /// [`MemoryWriter`]: ./struct.MemoryWriter.html | |
673 | pub struct GrowableMemoryWriter<'a> { | |
674 | buf: &'a mut Vec<u8>, | |
675 | pos: usize, | |
676 | } | |
677 | ||
d532000c | 678 | impl<'a> ByteWriter<'a> { |
28884194 | 679 | /// Constructs a new instance of `ByteWriter`. |
ac818eac | 680 | pub fn new(io: &'a mut dyn ByteIO) -> Self { ByteWriter { io } } |
d532000c | 681 | |
28884194 | 682 | /// Writes byte array to the output. |
d532000c KS |
683 | pub fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
684 | self.io.write_buf(buf) | |
685 | } | |
686 | ||
28884194 | 687 | /// Writes single byte to the output. |
d532000c KS |
688 | pub fn write_byte(&mut self, val: u8) -> ByteIOResult<()> { |
689 | let buf: [u8; 1] = [val]; | |
690 | self.io.write_buf(&buf) | |
691 | } | |
692 | ||
28884194 | 693 | /// Writes 16-bit big-endian integer to the output. |
d532000c KS |
694 | pub fn write_u16be(&mut self, val: u16) -> ByteIOResult<()> { |
695 | let buf: [u8; 2] = [((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; | |
696 | self.io.write_buf(&buf) | |
697 | } | |
698 | ||
28884194 | 699 | /// Writes 16-bit little-endian integer to the output. |
d532000c KS |
700 | pub fn write_u16le(&mut self, val: u16) -> ByteIOResult<()> { |
701 | let buf: [u8; 2] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8]; | |
702 | self.io.write_buf(&buf) | |
703 | } | |
704 | ||
28884194 | 705 | /// Writes 24-bit big-endian integer to the output. |
d532000c KS |
706 | pub fn write_u24be(&mut self, val: u32) -> ByteIOResult<()> { |
707 | let buf: [u8; 3] = [((val >> 16) & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; | |
708 | self.write_buf(&buf) | |
709 | } | |
710 | ||
28884194 | 711 | /// Writes 24-bit little-endian integer to the output. |
d532000c KS |
712 | pub fn write_u24le(&mut self, val: u32) -> ByteIOResult<()> { |
713 | let buf: [u8; 3] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, ((val >> 16) & 0xFF) as u8]; | |
714 | self.write_buf(&buf) | |
715 | } | |
716 | ||
28884194 | 717 | /// Writes 32-bit big-endian integer to the output. |
d532000c KS |
718 | pub fn write_u32be(&mut self, val: u32) -> ByteIOResult<()> { |
719 | self.write_u16be(((val >> 16) & 0xFFFF) as u16)?; | |
720 | self.write_u16be((val & 0xFFFF) as u16) | |
721 | } | |
722 | ||
28884194 | 723 | /// Writes 32-bit little-endian integer to the output. |
d532000c KS |
724 | pub fn write_u32le(&mut self, val: u32) -> ByteIOResult<()> { |
725 | self.write_u16le((val & 0xFFFF) as u16)?; | |
726 | self.write_u16le(((val >> 16) & 0xFFFF) as u16) | |
727 | } | |
728 | ||
28884194 | 729 | /// Writes 64-bit big-endian integer to the output. |
d532000c | 730 | pub fn write_u64be(&mut self, val: u64) -> ByteIOResult<()> { |
e243ceb4 KS |
731 | self.write_u32be((val >> 32) as u32)?; |
732 | self.write_u32be(val as u32) | |
d532000c KS |
733 | } |
734 | ||
28884194 | 735 | /// Writes 64-bit little-endian integer to the output. |
d532000c | 736 | pub fn write_u64le(&mut self, val: u64) -> ByteIOResult<()> { |
e243ceb4 KS |
737 | self.write_u32le(val as u32)?; |
738 | self.write_u32le((val >> 32) as u32) | |
d532000c KS |
739 | } |
740 | ||
28884194 | 741 | /// Writes 32-bit big-endian floating point number to the output. |
02a5bdaf KS |
742 | pub fn write_f32be(&mut self, val: f32) -> ByteIOResult<()> { |
743 | self.write_u32be(val.to_bits()) | |
744 | } | |
745 | ||
28884194 | 746 | /// Writes 32-bit little-endian floating point number to the output. |
02a5bdaf KS |
747 | pub fn write_f32le(&mut self, val: f32) -> ByteIOResult<()> { |
748 | self.write_u32le(val.to_bits()) | |
749 | } | |
750 | ||
28884194 | 751 | /// Writes 64-bit big-endian floating point number to the output. |
02a5bdaf KS |
752 | pub fn write_f64be(&mut self, val: f64) -> ByteIOResult<()> { |
753 | self.write_u64be(val.to_bits()) | |
754 | } | |
755 | ||
28884194 | 756 | /// Writes 64-bit little-endian floating point number to the output. |
02a5bdaf KS |
757 | pub fn write_f64le(&mut self, val: f64) -> ByteIOResult<()> { |
758 | self.write_u64le(val.to_bits()) | |
759 | } | |
760 | ||
28884194 | 761 | /// Reports the current write position. |
d532000c KS |
762 | pub fn tell(&mut self) -> u64 { |
763 | self.io.tell() | |
764 | } | |
765 | ||
28884194 | 766 | /// Seeks to the requested position. |
d532000c KS |
767 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
768 | self.io.seek(pos) | |
769 | } | |
770 | ||
28884194 | 771 | /// Reports the amount of bytes the writer can still write (-1 if unknown). |
d532000c KS |
772 | pub fn size_left(&mut self) -> i64 { |
773 | let sz = self.io.size(); | |
774 | if sz == -1 { return -1; } | |
775 | sz - (self.tell() as i64) | |
776 | } | |
777 | } | |
778 | ||
779 | impl<'a> MemoryWriter<'a> { | |
780 | ||
28884194 | 781 | /// Constructs a new instance of `MemoryWriter`. |
d532000c | 782 | pub fn new_write(buf: &'a mut [u8]) -> Self { |
1be85e00 | 783 | MemoryWriter { buf, pos: 0 } |
d532000c KS |
784 | } |
785 | ||
786 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
1be85e00 | 787 | if pos < 0 || (pos as usize) > self.buf.len() { |
d532000c KS |
788 | return Err(ByteIOError::WrongRange) |
789 | } | |
790 | self.pos = pos as usize; | |
791 | Ok(pos as u64) | |
792 | } | |
793 | } | |
794 | ||
795 | impl<'a> ByteIO for MemoryWriter<'a> { | |
796 | #[allow(unused_variables)] | |
797 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
798 | Err(ByteIOError::NotImplemented) | |
799 | } | |
800 | ||
801 | #[allow(unused_variables)] | |
802 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
803 | Err(ByteIOError::NotImplemented) | |
804 | } | |
805 | ||
806 | #[allow(unused_variables)] | |
807 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
808 | Err(ByteIOError::NotImplemented) | |
809 | } | |
810 | ||
811 | #[allow(unused_variables)] | |
812 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
813 | Err(ByteIOError::NotImplemented) | |
814 | } | |
815 | ||
816 | #[allow(unused_variables)] | |
817 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
818 | Err(ByteIOError::NotImplemented) | |
819 | } | |
820 | ||
821 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
1be85e00 | 822 | if self.pos + buf.len() > self.buf.len() { return Err(ByteIOError::WriteError); } |
b36f412c | 823 | self.buf[self.pos..][..buf.len()].copy_from_slice(buf); |
d532000c KS |
824 | self.pos += buf.len(); |
825 | Ok(()) | |
826 | } | |
827 | ||
828 | fn tell(&mut self) -> u64 { | |
829 | self.pos as u64 | |
830 | } | |
831 | ||
832 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
422e87e4 KS |
833 | let cur_pos = self.pos as i64; |
834 | let cur_size = self.buf.len() as i64; | |
835 | match pos { | |
836 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
837 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
838 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
839 | } | |
840 | } | |
841 | ||
842 | fn is_eof(&self) -> bool { | |
843 | self.pos >= self.buf.len() | |
844 | } | |
845 | ||
846 | fn is_seekable(&mut self) -> bool { | |
847 | true | |
848 | } | |
849 | ||
850 | fn size(&mut self) -> i64 { | |
851 | self.buf.len() as i64 | |
852 | } | |
853 | } | |
854 | ||
855 | impl<'a> GrowableMemoryWriter<'a> { | |
856 | ||
857 | /// Constructs a new instance of `GrowableMemoryWriter`. | |
858 | pub fn new_write(buf: &'a mut Vec<u8>) -> Self { | |
859 | GrowableMemoryWriter { buf, pos: 0 } | |
860 | } | |
861 | ||
862 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { | |
863 | if pos < 0 || (pos as usize) > self.buf.len() { | |
864 | return Err(ByteIOError::WrongRange) | |
865 | } | |
866 | self.pos = pos as usize; | |
867 | Ok(pos as u64) | |
868 | } | |
869 | } | |
870 | ||
871 | impl<'a> ByteIO for GrowableMemoryWriter<'a> { | |
872 | #[allow(unused_variables)] | |
873 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
874 | Err(ByteIOError::NotImplemented) | |
875 | } | |
876 | ||
877 | #[allow(unused_variables)] | |
878 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
879 | Err(ByteIOError::NotImplemented) | |
880 | } | |
881 | ||
882 | #[allow(unused_variables)] | |
883 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
884 | Err(ByteIOError::NotImplemented) | |
885 | } | |
886 | ||
887 | #[allow(unused_variables)] | |
888 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
889 | Err(ByteIOError::NotImplemented) | |
890 | } | |
891 | ||
892 | #[allow(unused_variables)] | |
893 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
894 | Err(ByteIOError::NotImplemented) | |
895 | } | |
896 | ||
897 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
898 | if self.pos + buf.len() > self.buf.len() { | |
899 | self.buf.resize(self.pos + buf.len(), 0); | |
900 | } | |
b36f412c | 901 | self.buf[self.pos..][..buf.len()].copy_from_slice(buf); |
422e87e4 KS |
902 | self.pos += buf.len(); |
903 | Ok(()) | |
904 | } | |
905 | ||
906 | fn tell(&mut self) -> u64 { | |
907 | self.pos as u64 | |
908 | } | |
909 | ||
910 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
1be85e00 KS |
911 | let cur_pos = self.pos as i64; |
912 | let cur_size = self.buf.len() as i64; | |
d532000c KS |
913 | match pos { |
914 | SeekFrom::Start(x) => self.real_seek(x as i64), | |
915 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), | |
916 | SeekFrom::End(x) => self.real_seek(cur_size + x), | |
917 | } | |
918 | } | |
919 | ||
e243ceb4 | 920 | fn is_eof(&self) -> bool { |
1be85e00 | 921 | self.pos >= self.buf.len() |
d532000c KS |
922 | } |
923 | ||
924 | fn is_seekable(&mut self) -> bool { | |
925 | true | |
926 | } | |
927 | ||
928 | fn size(&mut self) -> i64 { | |
929 | self.buf.len() as i64 | |
930 | } | |
931 | } | |
932 | ||
789354a8 | 933 | impl<T: Write+Seek> FileWriter<T> { |
28884194 | 934 | /// Constructs a new instance of `FileWriter`. |
789354a8 KS |
935 | pub fn new_write(file: T) -> Self { |
936 | FileWriter { file: Box::new(file) } | |
d532000c KS |
937 | } |
938 | } | |
939 | ||
789354a8 | 940 | impl<T: Write+Seek> ByteIO for FileWriter<T> { |
d532000c KS |
941 | #[allow(unused_variables)] |
942 | fn read_byte(&mut self) -> ByteIOResult<u8> { | |
943 | Err(ByteIOError::NotImplemented) | |
944 | } | |
945 | ||
946 | #[allow(unused_variables)] | |
947 | fn peek_byte(&mut self) -> ByteIOResult<u8> { | |
948 | Err(ByteIOError::NotImplemented) | |
949 | } | |
950 | ||
951 | #[allow(unused_variables)] | |
952 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
953 | Err(ByteIOError::NotImplemented) | |
954 | } | |
955 | ||
956 | #[allow(unused_variables)] | |
957 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
958 | Err(ByteIOError::NotImplemented) | |
959 | } | |
960 | ||
961 | #[allow(unused_variables)] | |
962 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { | |
963 | Err(ByteIOError::NotImplemented) | |
964 | } | |
965 | ||
966 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { | |
967 | match self.file.write_all(buf) { | |
968 | Ok(()) => Ok(()), | |
969 | Err(_) => Err(ByteIOError::WriteError), | |
970 | } | |
971 | } | |
972 | ||
973 | fn tell(&mut self) -> u64 { | |
974 | self.file.seek(SeekFrom::Current(0)).unwrap() | |
975 | } | |
976 | ||
977 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { | |
978 | let res = self.file.seek(pos); | |
979 | match res { | |
980 | Ok(r) => Ok(r), | |
981 | Err(_) => Err(ByteIOError::SeekError), | |
982 | } | |
983 | } | |
984 | ||
e243ceb4 | 985 | fn is_eof(&self) -> bool { |
d532000c KS |
986 | false |
987 | } | |
988 | ||
989 | fn is_seekable(&mut self) -> bool { | |
990 | true | |
991 | } | |
992 | ||
993 | fn size(&mut self) -> i64 { | |
994 | -1 | |
995 | } | |
90aa4e6b KS |
996 | } |
997 | ||
998 | #[cfg(test)] | |
999 | mod test { | |
1000 | use super::*; | |
1001 | use std::fs::File; | |
1002 | ||
1003 | #[test] | |
1004 | fn test_read() { | |
1005 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); | |
1006 | let buf: [u8; 64] = [1; 64]; | |
1007 | let mut mr = MemoryReader::new_read(&buf); | |
1008 | let mut reader = ByteReader::new(&mut mr); | |
1009 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); | |
1010 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); | |
1011 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); | |
1012 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); | |
1013 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); | |
1678d59a | 1014 | let mut file = File::open("assets/Misc/MaoMacha.asx").unwrap(); |
90aa4e6b KS |
1015 | let mut fr = FileReader::new_read(&mut file); |
1016 | let mut br2 = ByteReader::new(&mut fr); | |
1017 | assert_eq!(br2.read_byte().unwrap(), 0x30); | |
1018 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); | |
1019 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); | |
1020 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); | |
1021 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); | |
1022 | } | |
1023 | #[test] | |
1024 | fn test_write() { | |
d532000c KS |
1025 | let mut buf: [u8; 64] = [0; 64]; |
1026 | { | |
1027 | let mut mw = MemoryWriter::new_write(&mut buf); | |
1028 | let mut bw = ByteWriter::new(&mut mw); | |
1029 | bw.write_byte(0x00).unwrap(); | |
1030 | bw.write_u16be(0x0102).unwrap(); | |
1031 | bw.write_u24be(0x030405).unwrap(); | |
1032 | bw.write_u32be(0x06070809).unwrap(); | |
1033 | bw.write_u64be(0x0A0B0C0D0E0F1011).unwrap(); | |
1034 | bw.write_byte(0x00).unwrap(); | |
1035 | bw.write_u16le(0x0201).unwrap(); | |
1036 | bw.write_u24le(0x050403).unwrap(); | |
1037 | bw.write_u32le(0x09080706).unwrap(); | |
1038 | bw.write_u64le(0x11100F0E0D0C0B0A).unwrap(); | |
1039 | assert_eq!(bw.size_left(), 28); | |
1040 | } | |
1041 | for i in 0..0x12 { | |
1042 | assert_eq!(buf[(i + 0x00) as usize], i); | |
1043 | assert_eq!(buf[(i + 0x12) as usize], i); | |
1044 | } | |
90aa4e6b KS |
1045 | } |
1046 | } |