| 1 | use std::io::SeekFrom; |
| 2 | use std::fs::File; |
| 3 | use std::io::prelude::*; |
| 4 | use std::ptr; |
| 5 | |
| 6 | #[derive(Debug)] |
| 7 | pub enum ByteIOError { |
| 8 | EOF, |
| 9 | WrongRange, |
| 10 | WrongIOMode, |
| 11 | NotImplemented, |
| 12 | ReadError, |
| 13 | WriteError, |
| 14 | SeekError, |
| 15 | } |
| 16 | |
| 17 | pub type ByteIOResult<T> = Result<T, ByteIOError>; |
| 18 | |
| 19 | pub trait ByteIO { |
| 20 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
| 21 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
| 22 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
| 23 | fn read_byte(&mut self) -> ByteIOResult<u8>; |
| 24 | fn peek_byte(&mut self) -> ByteIOResult<u8>; |
| 25 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()>; |
| 26 | fn tell(&mut self) -> u64; |
| 27 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>; |
| 28 | fn is_eof(&self) -> bool; |
| 29 | fn is_seekable(&mut self) -> bool; |
| 30 | fn size(&mut self) -> i64; |
| 31 | } |
| 32 | |
| 33 | #[allow(dead_code)] |
| 34 | pub struct ByteReader<'a> { |
| 35 | io: &'a mut ByteIO, |
| 36 | } |
| 37 | |
| 38 | pub struct MemoryReader<'a> { |
| 39 | buf: &'a [u8], |
| 40 | size: usize, |
| 41 | pos: usize, |
| 42 | } |
| 43 | |
| 44 | pub struct FileReader<'a> { |
| 45 | file: &'a File, |
| 46 | eof: bool, |
| 47 | } |
| 48 | |
| 49 | macro_rules! read_int { |
| 50 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ |
| 51 | unsafe { |
| 52 | let mut buf: $inttype = 0; |
| 53 | $s.read_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; |
| 54 | Ok(buf.$which()) |
| 55 | } |
| 56 | }) |
| 57 | } |
| 58 | |
| 59 | macro_rules! peek_int { |
| 60 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ |
| 61 | unsafe { |
| 62 | let mut buf: $inttype = 0; |
| 63 | $s.peek_buf(&mut *(&mut buf as *mut $inttype as *mut [u8; $size]))?; |
| 64 | Ok(buf.$which()) |
| 65 | } |
| 66 | }) |
| 67 | } |
| 68 | |
| 69 | macro_rules! read_int_func { |
| 70 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => { |
| 71 | pub fn $s(src: &[u8]) -> ByteIOResult<$inttype> { |
| 72 | if src.len() < $size { return Err(ByteIOError::ReadError); } |
| 73 | unsafe { |
| 74 | let mut buf: $inttype = 0; |
| 75 | ptr::copy_nonoverlapping(src.as_ptr(), &mut buf as *mut $inttype as *mut u8, 1); |
| 76 | Ok(buf.$which()) |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | read_int_func!(read_u16be, u16, 2, to_be); |
| 83 | read_int_func!(read_u16le, u16, 2, to_le); |
| 84 | read_int_func!(read_u32be, u32, 4, to_be); |
| 85 | read_int_func!(read_u32le, u32, 4, to_le); |
| 86 | read_int_func!(read_u64be, u64, 8, to_be); |
| 87 | read_int_func!(read_u64le, u64, 8, to_le); |
| 88 | |
| 89 | pub fn read_u24be(src: &[u8]) -> ByteIOResult<u32> { |
| 90 | if src.len() < 3 { return Err(ByteIOError::ReadError); } |
| 91 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) |
| 92 | } |
| 93 | pub fn read_u24le(src: &[u8]) -> ByteIOResult<u32> { |
| 94 | if src.len() < 3 { return Err(ByteIOError::ReadError); } |
| 95 | Ok((u32::from(src[2]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[0])) |
| 96 | } |
| 97 | |
| 98 | impl<'a> ByteReader<'a> { |
| 99 | pub fn new(io: &'a mut ByteIO) -> Self { ByteReader { io } } |
| 100 | |
| 101 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 102 | self.io.read_buf(buf) |
| 103 | } |
| 104 | |
| 105 | pub fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 106 | self.io.read_buf_some(buf) |
| 107 | } |
| 108 | |
| 109 | pub fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 110 | self.io.peek_buf(buf) |
| 111 | } |
| 112 | |
| 113 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 114 | self.io.read_byte() |
| 115 | } |
| 116 | |
| 117 | pub fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 118 | self.io.peek_byte() |
| 119 | } |
| 120 | |
| 121 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { |
| 122 | read_int!(self, u16, 2, to_be) |
| 123 | } |
| 124 | |
| 125 | pub fn peek_u16be(&mut self) -> ByteIOResult<u16> { |
| 126 | peek_int!(self, u16, 2, to_be) |
| 127 | } |
| 128 | |
| 129 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { |
| 130 | let p16 = self.read_u16be()?; |
| 131 | let p8 = self.read_byte()?; |
| 132 | Ok((u32::from(p16) << 8) | u32::from(p8)) |
| 133 | } |
| 134 | |
| 135 | pub fn peek_u24be(&mut self) -> ByteIOResult<u32> { |
| 136 | let mut src: [u8; 3] = [0; 3]; |
| 137 | self.peek_buf(&mut src)?; |
| 138 | Ok((u32::from(src[0]) << 16) | (u32::from(src[1]) << 8) | u32::from(src[2])) |
| 139 | } |
| 140 | |
| 141 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { |
| 142 | read_int!(self, u32, 4, to_be) |
| 143 | } |
| 144 | |
| 145 | pub fn peek_u32be(&mut self) -> ByteIOResult<u32> { |
| 146 | peek_int!(self, u32, 4, to_be) |
| 147 | } |
| 148 | |
| 149 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { |
| 150 | read_int!(self, u64, 8, to_be) |
| 151 | } |
| 152 | |
| 153 | pub fn peek_u64be(&mut self) -> ByteIOResult<u64> { |
| 154 | peek_int!(self, u64, 8, to_be) |
| 155 | } |
| 156 | |
| 157 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { |
| 158 | read_int!(self, u16, 2, to_le) |
| 159 | } |
| 160 | |
| 161 | pub fn peek_u16le(&mut self) -> ByteIOResult<u16> { |
| 162 | peek_int!(self, u16, 2, to_le) |
| 163 | } |
| 164 | |
| 165 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { |
| 166 | let p8 = self.read_byte()?; |
| 167 | let p16 = self.read_u16le()?; |
| 168 | Ok((u32::from(p16) << 8) | u32::from(p8)) |
| 169 | } |
| 170 | |
| 171 | pub fn peek_u24le(&mut self) -> ByteIOResult<u32> { |
| 172 | let mut src: [u8; 3] = [0; 3]; |
| 173 | self.peek_buf(&mut src)?; |
| 174 | Ok(u32::from(src[0]) | (u32::from(src[1]) << 8) | (u32::from(src[2]) << 16)) |
| 175 | } |
| 176 | |
| 177 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { |
| 178 | read_int!(self, u32, 4, to_le) |
| 179 | } |
| 180 | |
| 181 | pub fn peek_u32le(&mut self) -> ByteIOResult<u32> { |
| 182 | peek_int!(self, u32, 4, to_le) |
| 183 | } |
| 184 | |
| 185 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { |
| 186 | read_int!(self, u64, 8, to_le) |
| 187 | } |
| 188 | |
| 189 | pub fn peek_u64le(&mut self) -> ByteIOResult<u64> { |
| 190 | peek_int!(self, u64, 8, to_le) |
| 191 | } |
| 192 | |
| 193 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<()> { |
| 194 | if self.io.is_seekable() { |
| 195 | self.io.seek(SeekFrom::Current(len as i64))?; |
| 196 | } else { |
| 197 | let mut ssize = len; |
| 198 | let mut buf : [u8; 16] = [0; 16]; |
| 199 | let bref = &mut buf; |
| 200 | while ssize > bref.len() { |
| 201 | self.io.read_buf(bref)?; |
| 202 | ssize -= bref.len(); |
| 203 | } |
| 204 | while ssize > 0 { |
| 205 | self.io.read_byte()?; |
| 206 | ssize -= 1; |
| 207 | } |
| 208 | } |
| 209 | Ok(()) |
| 210 | } |
| 211 | |
| 212 | pub fn tell(&mut self) -> u64 { |
| 213 | self.io.tell() |
| 214 | } |
| 215 | |
| 216 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 217 | self.io.seek(pos) |
| 218 | } |
| 219 | |
| 220 | pub fn is_eof(&self) -> bool { |
| 221 | self.io.is_eof() |
| 222 | } |
| 223 | |
| 224 | pub fn size(&mut self) -> i64 { |
| 225 | self.io.size() |
| 226 | } |
| 227 | |
| 228 | pub fn left(&mut self) -> i64 { |
| 229 | let size = self.io.size(); |
| 230 | if size == -1 { return -1; } |
| 231 | size - (self.io.tell() as i64) |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | impl<'a> MemoryReader<'a> { |
| 236 | |
| 237 | pub fn new_read(buf: &'a [u8]) -> Self { |
| 238 | MemoryReader { buf, size: buf.len(), pos: 0 } |
| 239 | } |
| 240 | |
| 241 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { |
| 242 | if pos < 0 || (pos as usize) > self.size { |
| 243 | return Err(ByteIOError::WrongRange); |
| 244 | } |
| 245 | self.pos = pos as usize; |
| 246 | Ok(pos as u64) |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | impl<'a> ByteIO for MemoryReader<'a> { |
| 251 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 252 | if self.is_eof() { return Err(ByteIOError::EOF); } |
| 253 | let res = self.buf[self.pos]; |
| 254 | self.pos += 1; |
| 255 | Ok(res) |
| 256 | } |
| 257 | |
| 258 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 259 | if self.is_eof() { return Err(ByteIOError::EOF); } |
| 260 | Ok(self.buf[self.pos]) |
| 261 | } |
| 262 | |
| 263 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 264 | let copy_size = if self.size - self.pos < buf.len() { self.size } else { buf.len() }; |
| 265 | if copy_size == 0 { return Err(ByteIOError::EOF); } |
| 266 | let dst = &mut buf[0..copy_size]; |
| 267 | dst.copy_from_slice(&self.buf[self.pos..][..copy_size]); |
| 268 | Ok(copy_size) |
| 269 | } |
| 270 | |
| 271 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 272 | let read_size = self.peek_buf(buf)?; |
| 273 | if read_size < buf.len() { return Err(ByteIOError::EOF); } |
| 274 | self.pos += read_size; |
| 275 | Ok(read_size) |
| 276 | } |
| 277 | |
| 278 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 279 | let read_size = self.peek_buf(buf)?; |
| 280 | self.pos += read_size; |
| 281 | Ok(read_size) |
| 282 | } |
| 283 | |
| 284 | #[allow(unused_variables)] |
| 285 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 286 | Err(ByteIOError::NotImplemented) |
| 287 | } |
| 288 | |
| 289 | fn tell(&mut self) -> u64 { |
| 290 | self.pos as u64 |
| 291 | } |
| 292 | |
| 293 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 294 | let cur_pos = self.pos as i64; |
| 295 | let cur_size = self.size as i64; |
| 296 | match pos { |
| 297 | SeekFrom::Start(x) => self.real_seek(x as i64), |
| 298 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), |
| 299 | SeekFrom::End(x) => self.real_seek(cur_size + x), |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | fn is_eof(&self) -> bool { |
| 304 | self.pos >= self.size |
| 305 | } |
| 306 | |
| 307 | fn is_seekable(&mut self) -> bool { |
| 308 | true |
| 309 | } |
| 310 | |
| 311 | fn size(&mut self) -> i64 { |
| 312 | self.buf.len() as i64 |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | impl<'a> FileReader<'a> { |
| 317 | |
| 318 | pub fn new_read(file: &'a mut File) -> Self { |
| 319 | FileReader { file, eof : false } |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | impl<'a> ByteIO for FileReader<'a> { |
| 324 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 325 | let mut byte : [u8; 1] = [0]; |
| 326 | let ret = self.file.read(&mut byte); |
| 327 | if ret.is_err() { return Err(ByteIOError::ReadError); } |
| 328 | let sz = ret.unwrap(); |
| 329 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } |
| 330 | Ok (byte[0]) |
| 331 | } |
| 332 | |
| 333 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 334 | let b = self.read_byte()?; |
| 335 | self.seek(SeekFrom::Current(-1))?; |
| 336 | Ok(b) |
| 337 | } |
| 338 | |
| 339 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 340 | let ret = self.file.read(buf); |
| 341 | if ret.is_err() { return Err(ByteIOError::ReadError); } |
| 342 | let sz = ret.unwrap(); |
| 343 | if sz < buf.len() { self.eof = true; return Err(ByteIOError::EOF); } |
| 344 | Ok(sz) |
| 345 | } |
| 346 | |
| 347 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 348 | let ret = self.file.read(buf); |
| 349 | if ret.is_err() { return Err(ByteIOError::ReadError); } |
| 350 | let sz = ret.unwrap(); |
| 351 | if sz < buf.len() { self.eof = true; } |
| 352 | Ok(sz) |
| 353 | } |
| 354 | |
| 355 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 356 | let size = self.read_buf(buf)?; |
| 357 | self.seek(SeekFrom::Current(-(size as i64)))?; |
| 358 | Ok(size) |
| 359 | } |
| 360 | |
| 361 | #[allow(unused_variables)] |
| 362 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 363 | Err(ByteIOError::NotImplemented) |
| 364 | } |
| 365 | |
| 366 | fn tell(&mut self) -> u64 { |
| 367 | self.file.seek(SeekFrom::Current(0)).unwrap() |
| 368 | } |
| 369 | |
| 370 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 371 | let res = self.file.seek(pos); |
| 372 | match res { |
| 373 | Ok(r) => Ok(r), |
| 374 | Err(_) => Err(ByteIOError::SeekError), |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | fn is_eof(&self) -> bool { |
| 379 | self.eof |
| 380 | } |
| 381 | |
| 382 | fn is_seekable(&mut self) -> bool { |
| 383 | true |
| 384 | } |
| 385 | |
| 386 | fn size(&mut self) -> i64 { |
| 387 | -1 |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | #[allow(dead_code)] |
| 392 | pub struct ByteWriter<'a> { |
| 393 | io: &'a mut ByteIO, |
| 394 | } |
| 395 | |
| 396 | pub struct MemoryWriter<'a> { |
| 397 | buf: &'a mut [u8], |
| 398 | size: usize, |
| 399 | pos: usize, |
| 400 | } |
| 401 | |
| 402 | pub struct FileWriter { |
| 403 | file: File, |
| 404 | } |
| 405 | |
| 406 | impl<'a> ByteWriter<'a> { |
| 407 | pub fn new(io: &'a mut ByteIO) -> Self { ByteWriter { io } } |
| 408 | |
| 409 | pub fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 410 | self.io.write_buf(buf) |
| 411 | } |
| 412 | |
| 413 | pub fn write_byte(&mut self, val: u8) -> ByteIOResult<()> { |
| 414 | let buf: [u8; 1] = [val]; |
| 415 | self.io.write_buf(&buf) |
| 416 | } |
| 417 | |
| 418 | pub fn write_u16be(&mut self, val: u16) -> ByteIOResult<()> { |
| 419 | let buf: [u8; 2] = [((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; |
| 420 | self.io.write_buf(&buf) |
| 421 | } |
| 422 | |
| 423 | pub fn write_u16le(&mut self, val: u16) -> ByteIOResult<()> { |
| 424 | let buf: [u8; 2] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8]; |
| 425 | self.io.write_buf(&buf) |
| 426 | } |
| 427 | |
| 428 | pub fn write_u24be(&mut self, val: u32) -> ByteIOResult<()> { |
| 429 | let buf: [u8; 3] = [((val >> 16) & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, (val & 0xFF) as u8]; |
| 430 | self.write_buf(&buf) |
| 431 | } |
| 432 | |
| 433 | pub fn write_u24le(&mut self, val: u32) -> ByteIOResult<()> { |
| 434 | let buf: [u8; 3] = [(val & 0xFF) as u8, ((val >> 8) & 0xFF) as u8, ((val >> 16) & 0xFF) as u8]; |
| 435 | self.write_buf(&buf) |
| 436 | } |
| 437 | |
| 438 | pub fn write_u32be(&mut self, val: u32) -> ByteIOResult<()> { |
| 439 | self.write_u16be(((val >> 16) & 0xFFFF) as u16)?; |
| 440 | self.write_u16be((val & 0xFFFF) as u16) |
| 441 | } |
| 442 | |
| 443 | pub fn write_u32le(&mut self, val: u32) -> ByteIOResult<()> { |
| 444 | self.write_u16le((val & 0xFFFF) as u16)?; |
| 445 | self.write_u16le(((val >> 16) & 0xFFFF) as u16) |
| 446 | } |
| 447 | |
| 448 | pub fn write_u64be(&mut self, val: u64) -> ByteIOResult<()> { |
| 449 | self.write_u32be((val >> 32) as u32)?; |
| 450 | self.write_u32be(val as u32) |
| 451 | } |
| 452 | |
| 453 | pub fn write_u64le(&mut self, val: u64) -> ByteIOResult<()> { |
| 454 | self.write_u32le(val as u32)?; |
| 455 | self.write_u32le((val >> 32) as u32) |
| 456 | } |
| 457 | |
| 458 | pub fn tell(&mut self) -> u64 { |
| 459 | self.io.tell() |
| 460 | } |
| 461 | |
| 462 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 463 | self.io.seek(pos) |
| 464 | } |
| 465 | |
| 466 | pub fn size_left(&mut self) -> i64 { |
| 467 | let sz = self.io.size(); |
| 468 | if sz == -1 { return -1; } |
| 469 | sz - (self.tell() as i64) |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | impl<'a> MemoryWriter<'a> { |
| 474 | |
| 475 | pub fn new_write(buf: &'a mut [u8]) -> Self { |
| 476 | let len = buf.len(); |
| 477 | MemoryWriter { buf, size: len, pos: 0 } |
| 478 | } |
| 479 | |
| 480 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { |
| 481 | if pos < 0 || (pos as usize) > self.size { |
| 482 | return Err(ByteIOError::WrongRange) |
| 483 | } |
| 484 | self.pos = pos as usize; |
| 485 | Ok(pos as u64) |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | impl<'a> ByteIO for MemoryWriter<'a> { |
| 490 | #[allow(unused_variables)] |
| 491 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 492 | Err(ByteIOError::NotImplemented) |
| 493 | } |
| 494 | |
| 495 | #[allow(unused_variables)] |
| 496 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 497 | Err(ByteIOError::NotImplemented) |
| 498 | } |
| 499 | |
| 500 | #[allow(unused_variables)] |
| 501 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 502 | Err(ByteIOError::NotImplemented) |
| 503 | } |
| 504 | |
| 505 | #[allow(unused_variables)] |
| 506 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 507 | Err(ByteIOError::NotImplemented) |
| 508 | } |
| 509 | |
| 510 | #[allow(unused_variables)] |
| 511 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 512 | Err(ByteIOError::NotImplemented) |
| 513 | } |
| 514 | |
| 515 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 516 | if self.pos + buf.len() > self.size { return Err(ByteIOError::WriteError); } |
| 517 | for i in 0..buf.len() { |
| 518 | self.buf[self.pos + i] = buf[i]; |
| 519 | } |
| 520 | self.pos += buf.len(); |
| 521 | Ok(()) |
| 522 | } |
| 523 | |
| 524 | fn tell(&mut self) -> u64 { |
| 525 | self.pos as u64 |
| 526 | } |
| 527 | |
| 528 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 529 | let cur_pos = self.pos as i64; |
| 530 | let cur_size = self.size as i64; |
| 531 | match pos { |
| 532 | SeekFrom::Start(x) => self.real_seek(x as i64), |
| 533 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), |
| 534 | SeekFrom::End(x) => self.real_seek(cur_size + x), |
| 535 | } |
| 536 | } |
| 537 | |
| 538 | fn is_eof(&self) -> bool { |
| 539 | self.pos >= self.size |
| 540 | } |
| 541 | |
| 542 | fn is_seekable(&mut self) -> bool { |
| 543 | true |
| 544 | } |
| 545 | |
| 546 | fn size(&mut self) -> i64 { |
| 547 | self.buf.len() as i64 |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | impl FileWriter { |
| 552 | pub fn new_write(file: File) -> Self { |
| 553 | FileWriter { file } |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | impl ByteIO for FileWriter { |
| 558 | #[allow(unused_variables)] |
| 559 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 560 | Err(ByteIOError::NotImplemented) |
| 561 | } |
| 562 | |
| 563 | #[allow(unused_variables)] |
| 564 | fn peek_byte(&mut self) -> ByteIOResult<u8> { |
| 565 | Err(ByteIOError::NotImplemented) |
| 566 | } |
| 567 | |
| 568 | #[allow(unused_variables)] |
| 569 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 570 | Err(ByteIOError::NotImplemented) |
| 571 | } |
| 572 | |
| 573 | #[allow(unused_variables)] |
| 574 | fn read_buf_some(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 575 | Err(ByteIOError::NotImplemented) |
| 576 | } |
| 577 | |
| 578 | #[allow(unused_variables)] |
| 579 | fn peek_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 580 | Err(ByteIOError::NotImplemented) |
| 581 | } |
| 582 | |
| 583 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<()> { |
| 584 | match self.file.write_all(buf) { |
| 585 | Ok(()) => Ok(()), |
| 586 | Err(_) => Err(ByteIOError::WriteError), |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | fn tell(&mut self) -> u64 { |
| 591 | self.file.seek(SeekFrom::Current(0)).unwrap() |
| 592 | } |
| 593 | |
| 594 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 595 | let res = self.file.seek(pos); |
| 596 | match res { |
| 597 | Ok(r) => Ok(r), |
| 598 | Err(_) => Err(ByteIOError::SeekError), |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | fn is_eof(&self) -> bool { |
| 603 | false |
| 604 | } |
| 605 | |
| 606 | fn is_seekable(&mut self) -> bool { |
| 607 | true |
| 608 | } |
| 609 | |
| 610 | fn size(&mut self) -> i64 { |
| 611 | -1 |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | #[cfg(test)] |
| 616 | mod test { |
| 617 | use super::*; |
| 618 | use std::fs::File; |
| 619 | |
| 620 | #[test] |
| 621 | fn test_read() { |
| 622 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); |
| 623 | let buf: [u8; 64] = [1; 64]; |
| 624 | let mut mr = MemoryReader::new_read(&buf); |
| 625 | let mut reader = ByteReader::new(&mut mr); |
| 626 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); |
| 627 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); |
| 628 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); |
| 629 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); |
| 630 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); |
| 631 | let mut file = File::open("assets/Misc/MaoMacha.asx").unwrap(); |
| 632 | let mut fr = FileReader::new_read(&mut file); |
| 633 | let mut br2 = ByteReader::new(&mut fr); |
| 634 | assert_eq!(br2.read_byte().unwrap(), 0x30); |
| 635 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); |
| 636 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); |
| 637 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); |
| 638 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); |
| 639 | } |
| 640 | #[test] |
| 641 | fn test_write() { |
| 642 | let mut buf: [u8; 64] = [0; 64]; |
| 643 | { |
| 644 | let mut mw = MemoryWriter::new_write(&mut buf); |
| 645 | let mut bw = ByteWriter::new(&mut mw); |
| 646 | bw.write_byte(0x00).unwrap(); |
| 647 | bw.write_u16be(0x0102).unwrap(); |
| 648 | bw.write_u24be(0x030405).unwrap(); |
| 649 | bw.write_u32be(0x06070809).unwrap(); |
| 650 | bw.write_u64be(0x0A0B0C0D0E0F1011).unwrap(); |
| 651 | bw.write_byte(0x00).unwrap(); |
| 652 | bw.write_u16le(0x0201).unwrap(); |
| 653 | bw.write_u24le(0x050403).unwrap(); |
| 654 | bw.write_u32le(0x09080706).unwrap(); |
| 655 | bw.write_u64le(0x11100F0E0D0C0B0A).unwrap(); |
| 656 | assert_eq!(bw.size_left(), 28); |
| 657 | } |
| 658 | for i in 0..0x12 { |
| 659 | assert_eq!(buf[(i + 0x00) as usize], i); |
| 660 | assert_eq!(buf[(i + 0x12) as usize], i); |
| 661 | } |
| 662 | } |
| 663 | } |