| 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 | macro_rules! read_int { |
| 96 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ |
| 97 | unsafe { |
| 98 | let mut buf: $inttype = 0; |
| 99 | $s.read_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; |
| 100 | Ok(buf.$which()) |
| 101 | } |
| 102 | }) |
| 103 | } |
| 104 | |
| 105 | macro_rules! peek_int { |
| 106 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ |
| 107 | unsafe { |
| 108 | let mut buf: $inttype = 0; |
| 109 | $s.peek_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; |
| 110 | Ok(buf.$which()) |
| 111 | } |
| 112 | }) |
| 113 | } |
| 114 | |
| 115 | macro_rules! read_int_func { |
| 116 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { |
| 117 | /// Reads integer of certain size and endianness. |
| 118 | pub fn $s(src: &[u8]) -> ByteIOResult<$inttype> { |
| 119 | if src.len() < $size { return Err(ByteIOError::ReadError); } |
| 120 | unsafe { |
| 121 | let mut buf: $inttype = 0; |
| 122 | ptr::copy_nonoverlapping(src.as_ptr(), &mut buf as *mut $inttype as *mut u8, std::mem::size_of::<$inttype>()); |
| 123 | Ok(buf.$which()) |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | read_int_func!(read_u16be, u16, 2, to_be); |
| 130 | read_int_func!(read_u16le, u16, 2, to_le); |
| 131 | read_int_func!(read_u32be, u32, 4, to_be); |
| 132 | read_int_func!(read_u32le, u32, 4, to_le); |
| 133 | read_int_func!(read_u64be, u64, 8, to_be); |
| 134 | read_int_func!(read_u64le, u64, 8, to_le); |
| 135 | |
| 136 | /// Reads 24-bit big-endian integer. |
| 137 | /// |
| 138 | /// # Example |
| 139 | /// |
| 140 | /// ```` |
| 141 | /// use nihav_core::io::byteio::read_u24be; |
| 142 | /// # use nihav_core::io::byteio::ByteIOResult; |
| 143 | /// |
| 144 | /// # fn foo() -> ByteIOResult<()> { |
| 145 | /// let src: [u8; 3] = [ 1, 2, 3]; |
| 146 | /// let value = read_u24be(&src)?; // should return 0x010203 |
| 147 | /// # Ok(()) |
| 148 | /// # } |
| 149 | /// ```` |
| 150 | pub fn read_u24be(src: &[u8]) -> ByteIOResult<u32> { |
| 151 | if src.len() < 3 { return Err(ByteIOError::ReadError); } |
| 152 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) |
| 153 | } |
| 154 | /// Reads 24-bit little-endian integer. |
| 155 | pub fn read_u24le(src: &[u8]) -> ByteIOResult<u32> { |
| 156 | if src.len() < 3 { return Err(ByteIOError::ReadError); } |
| 157 | Ok((u32::from(src[2]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[0])) |
| 158 | } |
| 159 | /// Reads 32-bit big-endian floating point number. |
| 160 | pub fn read_f32be(src: &[u8]) -> ByteIOResult<f32> { Ok(f32::from_bits(read_u32be(src)?)) } |
| 161 | /// Reads 32-bit little-endian floating point number. |
| 162 | pub fn read_f32le(src: &[u8]) -> ByteIOResult<f32> { Ok(f32::from_bits(read_u32le(src)?)) } |
| 163 | /// Reads 64-bit big-endian floating point number. |
| 164 | pub fn read_f64be(src: &[u8]) -> ByteIOResult<f64> { Ok(f64::from_bits(read_u64be(src)?)) } |
| 165 | /// Reads 64-bit little-endian floating point number. |
| 166 | pub fn read_f64le(src: &[u8]) -> ByteIOResult<f64> { Ok(f64::from_bits(read_u64le(src)?)) } |
| 167 | |
| 168 | macro_rules! write_int_func { |
| 169 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { |
| 170 | /// Writes integer of certain size and endianness into byte buffer. |
| 171 | pub fn $s(dst: &mut [u8], val: $inttype) -> ByteIOResult<()> { |
| 172 | if dst.len() < $size { return Err(ByteIOError::WriteError); } |
| 173 | unsafe { |
| 174 | let val = val.$which(); |
| 175 | ptr::copy_nonoverlapping(&val as *const $inttype as *const u8, dst.as_mut_ptr(), std::mem::size_of::<$inttype>()); |
| 176 | } |
| 177 | Ok(()) |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | write_int_func!(write_u16be, u16, 2, to_be); |
| 183 | write_int_func!(write_u16le, u16, 2, to_le); |
| 184 | write_int_func!(write_u32be, u32, 4, to_be); |
| 185 | write_int_func!(write_u32le, u32, 4, to_le); |
| 186 | write_int_func!(write_u64be, u64, 8, to_be); |
| 187 | write_int_func!(write_u64le, u64, 8, to_le); |
| 188 | |
| 189 | /// Writes 24-bit big-endian integer to the provided buffer. |
| 190 | /// |
| 191 | /// # Example |
| 192 | /// |
| 193 | /// ```` |
| 194 | /// use nihav_core::io::byteio::write_u24be; |
| 195 | /// # use nihav_core::io::byteio::ByteIOResult; |
| 196 | /// |
| 197 | /// # fn foo() -> ByteIOResult<()> { |
| 198 | /// let mut dst = [0u8; 3]; |
| 199 | /// write_u24be(&mut dst, 0x010203)?; |
| 200 | /// // dst should contain [ 1, 2, 3] now |
| 201 | /// # Ok(()) |
| 202 | /// # } |
| 203 | /// ```` |
| 204 | #[allow(clippy::identity_op)] |
| 205 | pub fn write_u24be(dst: &mut [u8], val: u32) -> ByteIOResult<()> { |
| 206 | if dst.len() < 3 { return Err(ByteIOError::WriteError); } |
| 207 | dst[0] = (val >> 16) as u8; |
| 208 | dst[1] = (val >> 8) as u8; |
| 209 | dst[2] = (val >> 0) as u8; |
| 210 | Ok(()) |
| 211 | } |
| 212 | /// Writes 24-bit little-endian integer to the provided buffer. |
| 213 | #[allow(clippy::identity_op)] |
| 214 | pub fn write_u24le(dst: &mut [u8], val: u32) -> ByteIOResult<()> { |
| 215 | if dst.len() < 3 { return Err(ByteIOError::WriteError); } |
| 216 | dst[0] = (val >> 0) as u8; |
| 217 | dst[1] = (val >> 8) as u8; |
| 218 | dst[2] = (val >> 16) as u8; |
| 219 | Ok(()) |
| 220 | } |
| 221 | /// Writes 32-bit big-endian floating point number to the provided buffer. |
| 222 | pub fn write_f32be(dst: &mut [u8], val: f32) -> ByteIOResult<()> { write_u32be(dst, val.to_bits()) } |
| 223 | /// Writes 32-bit little-endian floating point number to the provided buffer. |
| 224 | pub fn write_f32le(dst: &mut [u8], val: f32) -> ByteIOResult<()> { write_u32le(dst, val.to_bits()) } |
| 225 | /// Writes 64-bit big-endian floating point number to the provided buffer. |
| 226 | pub fn write_f64be(dst: &mut [u8], val: f64) -> ByteIOResult<()> { write_u64be(dst, val.to_bits()) } |
| 227 | /// Writes 64-bit little-endian floating point number to the provided buffer. |
| 228 | pub fn write_f64le(dst: &mut [u8], val: f64) -> ByteIOResult<()> { write_u64le(dst, val.to_bits()) } |
| 229 | |
| 230 | impl<'a> ByteReader<'a> { |
| 231 | /// Constructs a new instance of bytestream reader. |
| 232 | /// |
| 233 | /// # Examples |
| 234 | /// |
| 235 | /// ```` |
| 236 | /// use nihav_core::io::byteio::{MemoryReader,ByteReader}; |
| 237 | /// # use nihav_core::io::byteio::ByteIOResult; |
| 238 | /// |
| 239 | /// # fn foo() -> ByteIOResult<()> { |
| 240 | /// let memory: [u8; 4] = [ 0, 42, 42, 0 ]; |
| 241 | /// let mut mr = MemoryReader::new_read(&memory); |
| 242 | /// let mut br = ByteReader::new(&mut mr); |
| 243 | /// # Ok(()) |
| 244 | /// # } |
| 245 | /// ```` |
| 246 | pub fn new(io: &'a mut dyn ByteIO) -> Self { ByteReader { io } } |
| 247 | |
| 248 | /// Reads data into provided buffer. Partial read is treated as success. |
| 249 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 250 | self.io.read_buf(buf) |
| 251 | } |
| 252 | |
| 253 | /// Reads data into provided buffer. Partial read is treated as success. |
| 254 | pub fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 255 | self.io.read_buf_some(buf) |
| 256 | } |
| 257 | |
| 258 | /// Reads data into provided buffer but does not advance read position. |
| 259 | pub fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 260 | self.io.peek_buf(buf) |
| 261 | } |
| 262 | |
| 263 | /// Reads single byte from the stream. |
| 264 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 265 | self.io.read_byte() |
| 266 | } |
| 267 | |
| 268 | /// Returns the next byte value in the stream without advancing read position. |
| 269 | pub fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 270 | self.io.peek_byte() |
| 271 | } |
| 272 | |
| 273 | /// Reads four-byte array from the stream. |
| 274 | pub fn read_tag(&mut self) -> ByteIOResult<[u8; 4]> { |
| 275 | let mut buf = [0u8; 4]; |
| 276 | self.io.read_buf(&mut buf)?; |
| 277 | Ok(buf) |
| 278 | } |
| 279 | |
| 280 | /// Reads four-byte array from the stream without advancing read position. |
| 281 | pub fn peek_tag(&mut self) -> ByteIOResult<[u8; 4]> { |
| 282 | let mut buf = [0u8; 4]; |
| 283 | self.io.peek_buf(&mut buf)?; |
| 284 | Ok(buf) |
| 285 | } |
| 286 | |
| 287 | /// Reads 16-bit big-endian integer from the stream. |
| 288 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { |
| 289 | read_int!(self, u16, 2, to_be) |
| 290 | } |
| 291 | |
| 292 | /// Reads 16-bit big-endian integer from the stream without advancing read position. |
| 293 | pub fn peek_u16be(&mut self) -> ByteIOResult<u16> { |
| 294 | peek_int!(self, u16, 2, to_be) |
| 295 | } |
| 296 | |
| 297 | /// Reads 24-bit big-endian integer from the stream. |
| 298 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { |
| 299 | let p16 = self.read_u16be()?; |
| 300 | let p8 = self.read_byte()?; |
| 301 | Ok((u32::from(p16) << 8) | u32::from(p8)) |
| 302 | } |
| 303 | |
| 304 | /// Reads 24-bit big-endian integer from the stream without advancing read position. |
| 305 | pub fn peek_u24be(&mut self) -> ByteIOResult<u32> { |
| 306 | let mut src: [u8; 3] = [0; 3]; |
| 307 | self.peek_buf(&mut src)?; |
| 308 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) |
| 309 | } |
| 310 | |
| 311 | /// Reads 32-bit big-endian integer from the stream. |
| 312 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { |
| 313 | read_int!(self, u32, 4, to_be) |
| 314 | } |
| 315 | |
| 316 | /// Reads 32-bit big-endian integer from the stream without advancing read position. |
| 317 | pub fn peek_u32be(&mut self) -> ByteIOResult<u32> { |
| 318 | peek_int!(self, u32, 4, to_be) |
| 319 | } |
| 320 | |
| 321 | /// Reads 64-bit big-endian integer from the stream. |
| 322 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { |
| 323 | read_int!(self, u64, 8, to_be) |
| 324 | } |
| 325 | |
| 326 | /// Reads 64-bit big-endian integer from the stream without advancing read position. |
| 327 | pub fn peek_u64be(&mut self) -> ByteIOResult<u64> { |
| 328 | peek_int!(self, u64, 8, to_be) |
| 329 | } |
| 330 | |
| 331 | /// Reads 32-bit big-endian floating point number from the stream. |
| 332 | pub fn read_f32be(&mut self) -> ByteIOResult<f32> { |
| 333 | Ok(f32::from_bits(self.read_u32be()?)) |
| 334 | } |
| 335 | |
| 336 | /// Reads 32-bit big-endian floating point number from the stream without advancing read position. |
| 337 | pub fn peek_f32be(&mut self) -> ByteIOResult<f32> { |
| 338 | Ok(f32::from_bits(self.peek_u32be()?)) |
| 339 | } |
| 340 | |
| 341 | /// Reads 64-bit big-endian floating point number from the stream. |
| 342 | pub fn read_f64be(&mut self) -> ByteIOResult<f64> { |
| 343 | Ok(f64::from_bits(self.read_u64be()?)) |
| 344 | } |
| 345 | |
| 346 | /// Reads 64-bit big-endian floating point number from the stream without advancing read position. |
| 347 | pub fn peek_f64be(&mut self) -> ByteIOResult<f64> { |
| 348 | Ok(f64::from_bits(self.peek_u64be()?)) |
| 349 | } |
| 350 | |
| 351 | /// Reads 16-bit little-endian integer from the stream. |
| 352 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { |
| 353 | read_int!(self, u16, 2, to_le) |
| 354 | } |
| 355 | |
| 356 | /// Reads 16-bit little-endian integer from the stream without advancing read position. |
| 357 | pub fn peek_u16le(&mut self) -> ByteIOResult<u16> { |
| 358 | peek_int!(self, u16, 2, to_le) |
| 359 | } |
| 360 | |
| 361 | /// Reads 24-bit little-endian integer from the stream. |
| 362 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { |
| 363 | let p8 = self.read_byte()?; |
| 364 | let p16 = self.read_u16le()?; |
| 365 | Ok((u32::from(p16) << 8) | u32::from(p8)) |
| 366 | } |
| 367 | |
| 368 | /// Reads 24-bit little-endian integer from the stream without advancing read position. |
| 369 | pub fn peek_u24le(&mut self) -> ByteIOResult<u32> { |
| 370 | let mut src: [u8; 3] = [0; 3]; |
| 371 | self.peek_buf(&mut src)?; |
| 372 | Ok(u32::from(src[0]) | (u32::from(src[1]) << 8) | (u32::from(src[2]) << 16)) |
| 373 | } |
| 374 | |
| 375 | /// Reads 32-bit little-endian integer from the stream. |
| 376 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { |
| 377 | read_int!(self, u32, 4, to_le) |
| 378 | } |
| 379 | |
| 380 | /// Reads 32-bit little-endian integer from the stream without advancing read position. |
| 381 | pub fn peek_u32le(&mut self) -> ByteIOResult<u32> { |
| 382 | peek_int!(self, u32, 4, to_le) |
| 383 | } |
| 384 | |
| 385 | /// Reads 64-bit little-endian integer from the stream. |
| 386 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { |
| 387 | read_int!(self, u64, 8, to_le) |
| 388 | } |
| 389 | |
| 390 | /// Reads 64-bit little-endian integer from the stream without advancing read position. |
| 391 | pub fn peek_u64le(&mut self) -> ByteIOResult<u64> { |
| 392 | peek_int!(self, u64, 8, to_le) |
| 393 | } |
| 394 | |
| 395 | /// Reads 32-bit little-endian floating point number from the stream. |
| 396 | pub fn read_f32le(&mut self) -> ByteIOResult<f32> { |
| 397 | Ok(f32::from_bits(self.read_u32le()?)) |
| 398 | } |
| 399 | |
| 400 | /// Reads 32-bit little-endian floating point number from the stream without advancing read position. |
| 401 | pub fn peek_f32le(&mut self) -> ByteIOResult<f32> { |
| 402 | Ok(f32::from_bits(self.peek_u32le()?)) |
| 403 | } |
| 404 | |
| 405 | /// Reads 64-bit little-endian floating point number from the stream. |
| 406 | pub fn read_f64le(&mut self) -> ByteIOResult<f64> { |
| 407 | Ok(f64::from_bits(self.read_u64le()?)) |
| 408 | } |
| 409 | |
| 410 | /// Reads 64-bit little-endian floating point number from the stream without advancing read position. |
| 411 | pub fn peek_f64le(&mut self) -> ByteIOResult<f64> { |
| 412 | Ok(f64::from_bits(self.peek_u64le()?)) |
| 413 | } |
| 414 | |
| 415 | /// Skips requested number of bytes. |
| 416 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> { |
| 417 | if self.io.is_seekable() { |
| 418 | self.io.seek(SeekFrom::Current(len as i64))?; |
| 419 | } else { |
| 420 | let mut ssize = len; |
| 421 | let mut buf : [u8; 16] = [0; 16]; |
| 422 | let bref = &mut buf; |
| 423 | while ssize > bref.len() { |
| 424 | self.io.read_buf(bref)?; |
| 425 | ssize -= bref.len(); |
| 426 | } |
| 427 | while ssize > 0 { |
| 428 | self.io.read_byte()?; |
| 429 | ssize -= 1; |
| 430 | } |
| 431 | } |
| 432 | Ok(()) |
| 433 | } |
| 434 | |
| 435 | /// Returns current read position. |
| 436 | pub fn tell(&mut self) -> u64 { |
| 437 | self.io.tell() |
| 438 | } |
| 439 | |
| 440 | /// Seeks to the provided position. |
| 441 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 442 | self.io.seek(pos) |
| 443 | } |
| 444 | |
| 445 | /// Tells whether this is end of stream. |
| 446 | pub fn is_eof(&self) -> bool { |
| 447 | self.io.is_eof() |
| 448 | } |
| 449 | |
| 450 | /// Returns stream size or -1 if it is not known. |
| 451 | pub fn size(&mut self) -> i64 { |
| 452 | self.io.size() |
| 453 | } |
| 454 | |
| 455 | /// Reports number of bytes left in the stream. |
| 456 | pub fn left(&mut self) -> i64 { |
| 457 | let size = self.io.size(); |
| 458 | if size == -1 { return -1; } |
| 459 | size - (self.io.tell() as i64) |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | impl<'a> MemoryReader<'a> { |
| 464 | /// Constructs a new instance of `MemoryReader`. |
| 465 | pub fn new_read(buf: &'a [u8]) -> Self { |
| 466 | MemoryReader { buf, pos: 0 } |
| 467 | } |
| 468 | |
| 469 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { |
| 470 | if pos < 0 || (pos as usize) > self.buf.len() { |
| 471 | return Err(ByteIOError::WrongRange); |
| 472 | } |
| 473 | self.pos = pos as usize; |
| 474 | Ok(pos as u64) |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | impl<'a> ByteIO for MemoryReader<'a> { |
| 479 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 480 | if self.is_eof() { return Err(ByteIOError::EOF); } |
| 481 | let res = self.buf[self.pos]; |
| 482 | self.pos += 1; |
| 483 | Ok(res) |
| 484 | } |
| 485 | |
| 486 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 487 | if self.is_eof() { return Err(ByteIOError::EOF); } |
| 488 | Ok(self.buf[self.pos]) |
| 489 | } |
| 490 | |
| 491 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 492 | let copy_size = if self.buf.len() - self.pos < buf.len() { self.buf.len() - self.pos } else { buf.len() }; |
| 493 | if copy_size == 0 { return Err(ByteIOError::EOF); } |
| 494 | let dst = &mut buf[0..copy_size]; |
| 495 | dst.copy_from_slice(&self.buf[self.pos..][..copy_size]); |
| 496 | Ok(copy_size) |
| 497 | } |
| 498 | |
| 499 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 500 | let read_size = self.peek_buf(buf)?; |
| 501 | if read_size < buf.len() { return Err(ByteIOError::EOF); } |
| 502 | self.pos += read_size; |
| 503 | Ok(read_size) |
| 504 | } |
| 505 | |
| 506 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 507 | let read_size = self.peek_buf(buf)?; |
| 508 | self.pos += read_size; |
| 509 | Ok(read_size) |
| 510 | } |
| 511 | |
| 512 | #[allow(unused_variables)] |
| 513 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 514 | Err(ByteIOError::NotImplemented) |
| 515 | } |
| 516 | |
| 517 | fn tell(&mut self) -> u64 { |
| 518 | self.pos as u64 |
| 519 | } |
| 520 | |
| 521 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 522 | let cur_pos = self.pos as i64; |
| 523 | let cur_size = self.buf.len() as i64; |
| 524 | match pos { |
| 525 | SeekFrom::Start(x) => self.real_seek(x as i64), |
| 526 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), |
| 527 | SeekFrom::End(x) => self.real_seek(cur_size + x), |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | fn is_eof(&self) -> bool { |
| 532 | self.pos >= self.buf.len() |
| 533 | } |
| 534 | |
| 535 | fn is_seekable(&mut self) -> bool { |
| 536 | true |
| 537 | } |
| 538 | |
| 539 | fn size(&mut self) -> i64 { |
| 540 | self.buf.len() as i64 |
| 541 | } |
| 542 | |
| 543 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } |
| 544 | } |
| 545 | |
| 546 | impl<T: Read+Seek> FileReader<T> { |
| 547 | |
| 548 | /// Constructs a new instance of `FileReader`. |
| 549 | pub fn new_read(file: T) -> Self { |
| 550 | FileReader { file: Box::new(file), eof : false } |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | impl<T: Read+Seek> ByteIO for FileReader<T> { |
| 555 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 556 | let mut byte : [u8; 1] = [0]; |
| 557 | let ret = self.file.read(&mut byte); |
| 558 | if ret.is_err() { return Err(ByteIOError::ReadError); } |
| 559 | let sz = ret.unwrap(); |
| 560 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } |
| 561 | Ok (byte[0]) |
| 562 | } |
| 563 | |
| 564 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 565 | let b = self.read_byte()?; |
| 566 | self.seek(SeekFrom::Current(-1))?; |
| 567 | Ok(b) |
| 568 | } |
| 569 | |
| 570 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 571 | match self.file.read_exact(buf) { |
| 572 | Ok(()) => Ok(buf.len()), |
| 573 | Err(err) => { |
| 574 | if err.kind() == std::io::ErrorKind::UnexpectedEof { |
| 575 | self.eof = true; |
| 576 | Err(ByteIOError::EOF) |
| 577 | } else { |
| 578 | Err(ByteIOError::ReadError) |
| 579 | } |
| 580 | }, |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 585 | let ret = self.file.read(buf); |
| 586 | if ret.is_err() { return Err(ByteIOError::ReadError); } |
| 587 | let sz = ret.unwrap(); |
| 588 | if sz < buf.len() { |
| 589 | if let Err(_err) = self.file.read(&mut buf[sz..][..1]) { |
| 590 | self.eof = true; |
| 591 | } else { |
| 592 | return Ok(sz + 1); |
| 593 | } |
| 594 | } |
| 595 | Ok(sz) |
| 596 | } |
| 597 | |
| 598 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 599 | let size = self.read_buf(buf)?; |
| 600 | self.seek(SeekFrom::Current(-(size as i64)))?; |
| 601 | Ok(size) |
| 602 | } |
| 603 | |
| 604 | #[allow(unused_variables)] |
| 605 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 606 | Err(ByteIOError::NotImplemented) |
| 607 | } |
| 608 | |
| 609 | fn tell(&mut self) -> u64 { |
| 610 | self.file.seek(SeekFrom::Current(0)).unwrap() |
| 611 | } |
| 612 | |
| 613 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 614 | let res = self.file.seek(pos); |
| 615 | match res { |
| 616 | Ok(r) => Ok(r), |
| 617 | Err(_) => Err(ByteIOError::SeekError), |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | fn is_eof(&self) -> bool { |
| 622 | self.eof |
| 623 | } |
| 624 | |
| 625 | fn is_seekable(&mut self) -> bool { |
| 626 | true |
| 627 | } |
| 628 | |
| 629 | fn size(&mut self) -> i64 { |
| 630 | -1 |
| 631 | } |
| 632 | |
| 633 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } |
| 634 | } |
| 635 | |
| 636 | /// High-level bytestream writer. |
| 637 | /// |
| 638 | /// 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. |
| 639 | /// |
| 640 | /// # Examples |
| 641 | /// |
| 642 | /// ```` |
| 643 | /// use nihav_core::io::byteio::{MemoryWriter,ByteWriter}; |
| 644 | /// # use nihav_core::io::byteio::ByteIOResult; |
| 645 | /// |
| 646 | /// # fn foo() -> ByteIOResult<()> { |
| 647 | /// let mut memory = [0u8; 4]; |
| 648 | /// let mut mw = MemoryWriter::new_write(&mut memory); |
| 649 | /// let mut bw = ByteWriter::new(&mut mw); |
| 650 | /// let val = bw.write_u16be(42)?; // memory should be [ 0, 42, 0, 0 ] |
| 651 | /// let val = bw.write_u16le(42)?; // memory should be [ 0, 42, 42, 0 ] |
| 652 | /// # Ok(()) |
| 653 | /// # } |
| 654 | /// ```` |
| 655 | /// |
| 656 | /// [`ByteIO`]: ./trait.ByteIO.html |
| 657 | /// [`MemoryWriter`]: ./struct.MemoryWriter.html |
| 658 | #[allow(dead_code)] |
| 659 | pub struct ByteWriter<'a> { |
| 660 | io: &'a mut dyn ByteIO, |
| 661 | } |
| 662 | |
| 663 | /// Bytestream writer to memory. |
| 664 | pub struct MemoryWriter<'a> { |
| 665 | buf: &'a mut [u8], |
| 666 | pos: usize, |
| 667 | } |
| 668 | |
| 669 | /// Bytestream writer to anything implementing `std::io::Write` and `std::io::Seek`. |
| 670 | pub struct FileWriter<T: Write+Seek> { |
| 671 | file: Box<T>, |
| 672 | } |
| 673 | |
| 674 | /// Bytestream writer to memory. |
| 675 | /// |
| 676 | /// Unlike [`MemoryWriter`] which writes to an array of fixed size, `GrowableMemoryWriter` grows output size when output size exceeds capacity. |
| 677 | /// |
| 678 | /// [`MemoryWriter`]: ./struct.MemoryWriter.html |
| 679 | pub struct GrowableMemoryWriter<'a> { |
| 680 | buf: &'a mut Vec<u8>, |
| 681 | pos: usize, |
| 682 | } |
| 683 | |
| 684 | impl<'a> ByteWriter<'a> { |
| 685 | /// Constructs a new instance of `ByteWriter`. |
| 686 | pub fn new(io: &'a mut dyn ByteIO) -> Self { ByteWriter { io } } |
| 687 | |
| 688 | /// Writes byte array to the output. |
| 689 | pub fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 690 | self.io.write_buf(buf) |
| 691 | } |
| 692 | |
| 693 | /// Writes single byte to the output. |
| 694 | pub fn write_byte(&mut self, val: u8) -> ByteIOResult<()> { |
| 695 | let buf: [u8; 1] = [val]; |
| 696 | self.io.write_buf(&buf) |
| 697 | } |
| 698 | |
| 699 | /// Writes 16-bit big-endian integer to the output. |
| 700 | pub fn write_u16be(&mut self, val: u16) -> ByteIOResult<()> { |
| 701 | let buf: [u8; 2] = [((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; |
| 702 | self.io.write_buf(&buf) |
| 703 | } |
| 704 | |
| 705 | /// Writes 16-bit little-endian integer to the output. |
| 706 | pub fn write_u16le(&mut self, val: u16) -> ByteIOResult<()> { |
| 707 | let buf: [u8; 2] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8]; |
| 708 | self.io.write_buf(&buf) |
| 709 | } |
| 710 | |
| 711 | /// Writes 24-bit big-endian integer to the output. |
| 712 | pub fn write_u24be(&mut self, val: u32) -> ByteIOResult<()> { |
| 713 | let buf: [u8; 3] = [((val >> 16) & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; |
| 714 | self.write_buf(&buf) |
| 715 | } |
| 716 | |
| 717 | /// Writes 24-bit little-endian integer to the output. |
| 718 | pub fn write_u24le(&mut self, val: u32) -> ByteIOResult<()> { |
| 719 | let buf: [u8; 3] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, ((val >> 16) & 0xFF) as u8]; |
| 720 | self.write_buf(&buf) |
| 721 | } |
| 722 | |
| 723 | /// Writes 32-bit big-endian integer to the output. |
| 724 | pub fn write_u32be(&mut self, val: u32) -> ByteIOResult<()> { |
| 725 | self.write_u16be(((val >> 16) & 0xFFFF) as u16)?; |
| 726 | self.write_u16be((val & 0xFFFF) as u16) |
| 727 | } |
| 728 | |
| 729 | /// Writes 32-bit little-endian integer to the output. |
| 730 | pub fn write_u32le(&mut self, val: u32) -> ByteIOResult<()> { |
| 731 | self.write_u16le((val & 0xFFFF) as u16)?; |
| 732 | self.write_u16le(((val >> 16) & 0xFFFF) as u16) |
| 733 | } |
| 734 | |
| 735 | /// Writes 64-bit big-endian integer to the output. |
| 736 | pub fn write_u64be(&mut self, val: u64) -> ByteIOResult<()> { |
| 737 | self.write_u32be((val >> 32) as u32)?; |
| 738 | self.write_u32be(val as u32) |
| 739 | } |
| 740 | |
| 741 | /// Writes 64-bit little-endian integer to the output. |
| 742 | pub fn write_u64le(&mut self, val: u64) -> ByteIOResult<()> { |
| 743 | self.write_u32le(val as u32)?; |
| 744 | self.write_u32le((val >> 32) as u32) |
| 745 | } |
| 746 | |
| 747 | /// Writes 32-bit big-endian floating point number to the output. |
| 748 | pub fn write_f32be(&mut self, val: f32) -> ByteIOResult<()> { |
| 749 | self.write_u32be(val.to_bits()) |
| 750 | } |
| 751 | |
| 752 | /// Writes 32-bit little-endian floating point number to the output. |
| 753 | pub fn write_f32le(&mut self, val: f32) -> ByteIOResult<()> { |
| 754 | self.write_u32le(val.to_bits()) |
| 755 | } |
| 756 | |
| 757 | /// Writes 64-bit big-endian floating point number to the output. |
| 758 | pub fn write_f64be(&mut self, val: f64) -> ByteIOResult<()> { |
| 759 | self.write_u64be(val.to_bits()) |
| 760 | } |
| 761 | |
| 762 | /// Writes 64-bit little-endian floating point number to the output. |
| 763 | pub fn write_f64le(&mut self, val: f64) -> ByteIOResult<()> { |
| 764 | self.write_u64le(val.to_bits()) |
| 765 | } |
| 766 | |
| 767 | /// Reports the current write position. |
| 768 | pub fn tell(&mut self) -> u64 { |
| 769 | self.io.tell() |
| 770 | } |
| 771 | |
| 772 | /// Seeks to the requested position. |
| 773 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 774 | self.io.seek(pos) |
| 775 | } |
| 776 | |
| 777 | /// Reports the amount of bytes the writer can still write (-1 if unknown). |
| 778 | pub fn size_left(&mut self) -> i64 { |
| 779 | let sz = self.io.size(); |
| 780 | if sz == -1 { return -1; } |
| 781 | sz - (self.tell() as i64) |
| 782 | } |
| 783 | |
| 784 | /// Flushes output stream if possible. |
| 785 | pub fn flush(&mut self) -> ByteIOResult<()> { |
| 786 | self.io.flush() |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | impl<'a> MemoryWriter<'a> { |
| 791 | |
| 792 | /// Constructs a new instance of `MemoryWriter`. |
| 793 | pub fn new_write(buf: &'a mut [u8]) -> Self { |
| 794 | MemoryWriter { buf, pos: 0 } |
| 795 | } |
| 796 | |
| 797 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { |
| 798 | if pos < 0 || (pos as usize) > self.buf.len() { |
| 799 | return Err(ByteIOError::WrongRange) |
| 800 | } |
| 801 | self.pos = pos as usize; |
| 802 | Ok(pos as u64) |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | impl<'a> ByteIO for MemoryWriter<'a> { |
| 807 | #[allow(unused_variables)] |
| 808 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 809 | Err(ByteIOError::NotImplemented) |
| 810 | } |
| 811 | |
| 812 | #[allow(unused_variables)] |
| 813 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 814 | Err(ByteIOError::NotImplemented) |
| 815 | } |
| 816 | |
| 817 | #[allow(unused_variables)] |
| 818 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 819 | Err(ByteIOError::NotImplemented) |
| 820 | } |
| 821 | |
| 822 | #[allow(unused_variables)] |
| 823 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 824 | Err(ByteIOError::NotImplemented) |
| 825 | } |
| 826 | |
| 827 | #[allow(unused_variables)] |
| 828 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 829 | Err(ByteIOError::NotImplemented) |
| 830 | } |
| 831 | |
| 832 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 833 | if self.pos + buf.len() > self.buf.len() { return Err(ByteIOError::WriteError); } |
| 834 | self.buf[self.pos..][..buf.len()].copy_from_slice(buf); |
| 835 | self.pos += buf.len(); |
| 836 | Ok(()) |
| 837 | } |
| 838 | |
| 839 | fn tell(&mut self) -> u64 { |
| 840 | self.pos as u64 |
| 841 | } |
| 842 | |
| 843 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 844 | let cur_pos = self.pos as i64; |
| 845 | let cur_size = self.buf.len() as i64; |
| 846 | match pos { |
| 847 | SeekFrom::Start(x) => self.real_seek(x as i64), |
| 848 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), |
| 849 | SeekFrom::End(x) => self.real_seek(cur_size + x), |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | fn is_eof(&self) -> bool { |
| 854 | self.pos >= self.buf.len() |
| 855 | } |
| 856 | |
| 857 | fn is_seekable(&mut self) -> bool { |
| 858 | true |
| 859 | } |
| 860 | |
| 861 | fn size(&mut self) -> i64 { |
| 862 | self.buf.len() as i64 |
| 863 | } |
| 864 | |
| 865 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } |
| 866 | } |
| 867 | |
| 868 | impl<'a> GrowableMemoryWriter<'a> { |
| 869 | |
| 870 | /// Constructs a new instance of `GrowableMemoryWriter`. |
| 871 | pub fn new_write(buf: &'a mut Vec<u8>) -> Self { |
| 872 | GrowableMemoryWriter { buf, pos: 0 } |
| 873 | } |
| 874 | |
| 875 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { |
| 876 | if pos < 0 || (pos as usize) > self.buf.len() { |
| 877 | return Err(ByteIOError::WrongRange) |
| 878 | } |
| 879 | self.pos = pos as usize; |
| 880 | Ok(pos as u64) |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | impl<'a> ByteIO for GrowableMemoryWriter<'a> { |
| 885 | #[allow(unused_variables)] |
| 886 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 887 | Err(ByteIOError::NotImplemented) |
| 888 | } |
| 889 | |
| 890 | #[allow(unused_variables)] |
| 891 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 892 | Err(ByteIOError::NotImplemented) |
| 893 | } |
| 894 | |
| 895 | #[allow(unused_variables)] |
| 896 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 897 | Err(ByteIOError::NotImplemented) |
| 898 | } |
| 899 | |
| 900 | #[allow(unused_variables)] |
| 901 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 902 | Err(ByteIOError::NotImplemented) |
| 903 | } |
| 904 | |
| 905 | #[allow(unused_variables)] |
| 906 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 907 | Err(ByteIOError::NotImplemented) |
| 908 | } |
| 909 | |
| 910 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 911 | if self.pos + buf.len() > self.buf.len() { |
| 912 | self.buf.resize(self.pos + buf.len(), 0); |
| 913 | } |
| 914 | self.buf[self.pos..][..buf.len()].copy_from_slice(buf); |
| 915 | self.pos += buf.len(); |
| 916 | Ok(()) |
| 917 | } |
| 918 | |
| 919 | fn tell(&mut self) -> u64 { |
| 920 | self.pos as u64 |
| 921 | } |
| 922 | |
| 923 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 924 | let cur_pos = self.pos as i64; |
| 925 | let cur_size = self.buf.len() as i64; |
| 926 | match pos { |
| 927 | SeekFrom::Start(x) => self.real_seek(x as i64), |
| 928 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), |
| 929 | SeekFrom::End(x) => self.real_seek(cur_size + x), |
| 930 | } |
| 931 | } |
| 932 | |
| 933 | fn is_eof(&self) -> bool { |
| 934 | self.pos >= self.buf.len() |
| 935 | } |
| 936 | |
| 937 | fn is_seekable(&mut self) -> bool { |
| 938 | true |
| 939 | } |
| 940 | |
| 941 | fn size(&mut self) -> i64 { |
| 942 | self.buf.len() as i64 |
| 943 | } |
| 944 | |
| 945 | fn flush(&mut self) -> ByteIOResult<()> { Ok(()) } |
| 946 | } |
| 947 | |
| 948 | impl<T: Write+Seek> FileWriter<T> { |
| 949 | /// Constructs a new instance of `FileWriter`. |
| 950 | pub fn new_write(file: T) -> Self { |
| 951 | FileWriter { file: Box::new(file) } |
| 952 | } |
| 953 | } |
| 954 | |
| 955 | impl<T: Write+Seek> ByteIO for FileWriter<T> { |
| 956 | #[allow(unused_variables)] |
| 957 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 958 | Err(ByteIOError::NotImplemented) |
| 959 | } |
| 960 | |
| 961 | #[allow(unused_variables)] |
| 962 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 963 | Err(ByteIOError::NotImplemented) |
| 964 | } |
| 965 | |
| 966 | #[allow(unused_variables)] |
| 967 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 968 | Err(ByteIOError::NotImplemented) |
| 969 | } |
| 970 | |
| 971 | #[allow(unused_variables)] |
| 972 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 973 | Err(ByteIOError::NotImplemented) |
| 974 | } |
| 975 | |
| 976 | #[allow(unused_variables)] |
| 977 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 978 | Err(ByteIOError::NotImplemented) |
| 979 | } |
| 980 | |
| 981 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 982 | match self.file.write_all(buf) { |
| 983 | Ok(()) => Ok(()), |
| 984 | Err(_) => Err(ByteIOError::WriteError), |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | fn tell(&mut self) -> u64 { |
| 989 | self.file.seek(SeekFrom::Current(0)).unwrap() |
| 990 | } |
| 991 | |
| 992 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 993 | let res = self.file.seek(pos); |
| 994 | match res { |
| 995 | Ok(r) => Ok(r), |
| 996 | Err(_) => Err(ByteIOError::SeekError), |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | fn is_eof(&self) -> bool { |
| 1001 | false |
| 1002 | } |
| 1003 | |
| 1004 | fn is_seekable(&mut self) -> bool { |
| 1005 | true |
| 1006 | } |
| 1007 | |
| 1008 | fn size(&mut self) -> i64 { |
| 1009 | -1 |
| 1010 | } |
| 1011 | |
| 1012 | fn flush(&mut self) -> ByteIOResult<()> { |
| 1013 | match self.file.flush() { |
| 1014 | Ok(()) => Ok(()), |
| 1015 | Err(_) => Err(ByteIOError::WriteError), |
| 1016 | } |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | #[cfg(test)] |
| 1021 | mod test { |
| 1022 | use super::*; |
| 1023 | use std::fs::File; |
| 1024 | |
| 1025 | #[test] |
| 1026 | fn test_read() { |
| 1027 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); |
| 1028 | let buf: [u8; 64] = [1; 64]; |
| 1029 | let mut mr = MemoryReader::new_read(&buf); |
| 1030 | let mut reader = ByteReader::new(&mut mr); |
| 1031 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); |
| 1032 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); |
| 1033 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); |
| 1034 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); |
| 1035 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); |
| 1036 | let mut file = File::open("assets/Misc/MaoMacha.asx").unwrap(); |
| 1037 | let mut fr = FileReader::new_read(&mut file); |
| 1038 | let mut br2 = ByteReader::new(&mut fr); |
| 1039 | assert_eq!(br2.read_byte().unwrap(), 0x30); |
| 1040 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); |
| 1041 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); |
| 1042 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); |
| 1043 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); |
| 1044 | } |
| 1045 | #[test] |
| 1046 | fn test_write() { |
| 1047 | let mut buf: [u8; 64] = [0; 64]; |
| 1048 | { |
| 1049 | let mut mw = MemoryWriter::new_write(&mut buf); |
| 1050 | let mut bw = ByteWriter::new(&mut mw); |
| 1051 | bw.write_byte(0x00).unwrap(); |
| 1052 | bw.write_u16be(0x0102).unwrap(); |
| 1053 | bw.write_u24be(0x030405).unwrap(); |
| 1054 | bw.write_u32be(0x06070809).unwrap(); |
| 1055 | bw.write_u64be(0x0A0B0C0D0E0F1011).unwrap(); |
| 1056 | bw.write_byte(0x00).unwrap(); |
| 1057 | bw.write_u16le(0x0201).unwrap(); |
| 1058 | bw.write_u24le(0x050403).unwrap(); |
| 1059 | bw.write_u32le(0x09080706).unwrap(); |
| 1060 | bw.write_u64le(0x11100F0E0D0C0B0A).unwrap(); |
| 1061 | assert_eq!(bw.size_left(), 28); |
| 1062 | } |
| 1063 | for i in 0..0x12 { |
| 1064 | assert_eq!(buf[(i + 0x00) as usize], i); |
| 1065 | assert_eq!(buf[(i + 0x12) as usize], i); |
| 1066 | } |
| 1067 | } |
| 1068 | } |