| 1 | use std::io::SeekFrom; |
| 2 | use std::fs::File; |
| 3 | use std::io::prelude::*; |
| 4 | |
| 5 | #[derive(Debug)] |
| 6 | pub enum ByteIOError { |
| 7 | EOF, |
| 8 | WrongRange, |
| 9 | WrongIOMode, |
| 10 | NotImplemented, |
| 11 | ReadError, |
| 12 | WriteError, |
| 13 | SeekError, |
| 14 | } |
| 15 | |
| 16 | type ByteIOResult<T> = Result<T, ByteIOError>; |
| 17 | |
| 18 | pub trait ByteIO { |
| 19 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize>; |
| 20 | fn read_byte(&mut self) -> ByteIOResult<u8>; |
| 21 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize>; |
| 22 | fn tell(&mut self) -> u64; |
| 23 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64>; |
| 24 | fn is_eof(&mut self) -> bool; |
| 25 | fn is_seekable(&mut self) -> bool; |
| 26 | } |
| 27 | |
| 28 | #[allow(dead_code)] |
| 29 | pub struct ByteReader<'a> { |
| 30 | io: &'a mut ByteIO, |
| 31 | } |
| 32 | |
| 33 | pub struct MemoryReader<'a> { |
| 34 | buf: &'a [u8], |
| 35 | size: usize, |
| 36 | pos: usize, |
| 37 | do_write: bool, |
| 38 | } |
| 39 | |
| 40 | pub struct FileReader<'a> { |
| 41 | file: &'a File, |
| 42 | eof: bool, |
| 43 | } |
| 44 | |
| 45 | macro_rules! read_int { |
| 46 | ($s: ident, $inttype: ty, $size: expr, $which: ident) => ({ |
| 47 | let mut buf = [0; $size]; |
| 48 | try!($s.read_buf(&mut buf)); |
| 49 | unsafe { |
| 50 | Ok((*(buf.as_ptr() as *const $inttype)).$which()) |
| 51 | } |
| 52 | }) |
| 53 | } |
| 54 | |
| 55 | impl<'a> ByteReader<'a> { |
| 56 | pub fn new(io: &'a mut ByteIO) -> ByteReader { ByteReader { io: io } } |
| 57 | |
| 58 | pub fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 59 | self.io.read_buf(buf) |
| 60 | } |
| 61 | |
| 62 | pub fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 63 | self.io.read_byte() |
| 64 | } |
| 65 | |
| 66 | pub fn read_u16be(&mut self) -> ByteIOResult<u16> { |
| 67 | read_int!(self, u16, 2, to_be) |
| 68 | } |
| 69 | |
| 70 | pub fn read_u24be(&mut self) -> ByteIOResult<u32> { |
| 71 | let p16 = self.read_u16be(); |
| 72 | if let Err(e) = p16 { return Err(e); } |
| 73 | let p8 = self.read_byte(); |
| 74 | if let Err(e) = p8 { return Err(e); } |
| 75 | Ok(((p16.unwrap() as u32) << 8) | (p8.unwrap() as u32)) |
| 76 | } |
| 77 | |
| 78 | pub fn read_u32be(&mut self) -> ByteIOResult<u32> { |
| 79 | read_int!(self, u32, 4, to_be) |
| 80 | } |
| 81 | |
| 82 | pub fn read_u64be(&mut self) -> ByteIOResult<u64> { |
| 83 | read_int!(self, u64, 8, to_be) |
| 84 | } |
| 85 | |
| 86 | pub fn read_u16le(&mut self) -> ByteIOResult<u16> { |
| 87 | read_int!(self, u16, 2, to_le) |
| 88 | } |
| 89 | |
| 90 | pub fn read_u24le(&mut self) -> ByteIOResult<u32> { |
| 91 | let p8 = self.read_byte(); |
| 92 | if let Err(e) = p8 { return Err(e); } |
| 93 | let p16 = self.read_u16le(); |
| 94 | if let Err(e) = p16 { return Err(e); } |
| 95 | Ok(((p16.unwrap() as u32) << 8) | (p8.unwrap() as u32)) |
| 96 | } |
| 97 | |
| 98 | pub fn read_u32le(&mut self) -> ByteIOResult<u32> { |
| 99 | read_int!(self, u32, 4, to_le) |
| 100 | } |
| 101 | |
| 102 | pub fn read_u64le(&mut self) -> ByteIOResult<u64> { |
| 103 | read_int!(self, u64, 8, to_le) |
| 104 | } |
| 105 | |
| 106 | pub fn read_skip(&mut self, len: usize) -> ByteIOResult<u64> { |
| 107 | if self.io.is_seekable() { |
| 108 | self.io.seek(SeekFrom::Current(len as i64))?; |
| 109 | } else { |
| 110 | let mut ssize = len; |
| 111 | let mut buf : [u8; 16] = [0; 16]; |
| 112 | let mut bref = &mut buf; |
| 113 | while ssize > bref.len() { |
| 114 | self.io.read_buf(bref)?; |
| 115 | ssize -= bref.len(); |
| 116 | } |
| 117 | while ssize > 0 { |
| 118 | self.io.read_byte()?; |
| 119 | ssize = ssize - 1; |
| 120 | } |
| 121 | } |
| 122 | Ok(self.tell()) |
| 123 | } |
| 124 | |
| 125 | pub fn tell(&mut self) -> u64 { |
| 126 | self.io.tell() |
| 127 | } |
| 128 | |
| 129 | pub fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 130 | self.io.seek(pos) |
| 131 | } |
| 132 | |
| 133 | pub fn is_eof(&mut self) -> bool { |
| 134 | self.io.is_eof() |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | impl<'a> MemoryReader<'a> { |
| 139 | |
| 140 | pub fn new_read(buf: &'a [u8]) -> Self { |
| 141 | MemoryReader { buf: buf, size: buf.len(), pos: 0, do_write: false } |
| 142 | } |
| 143 | |
| 144 | fn real_seek(&mut self, pos: i64) -> ByteIOResult<u64> { |
| 145 | if pos < 0 || (pos as usize) > self.size { |
| 146 | return Err(ByteIOError::WrongRange) |
| 147 | } |
| 148 | self.pos = pos as usize; |
| 149 | Ok(pos as u64) |
| 150 | } |
| 151 | |
| 152 | fn check_read_perm(&self) -> ByteIOResult<()> { |
| 153 | if self.do_write { |
| 154 | Err(ByteIOError::WrongIOMode) |
| 155 | } else { |
| 156 | Ok(()) |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | fn check_write_perm(&self) -> ByteIOResult<()> { |
| 161 | if !self.do_write { |
| 162 | Err(ByteIOError::WrongIOMode) |
| 163 | } else { |
| 164 | Ok(()) |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | impl<'a> ByteIO for MemoryReader<'a> { |
| 170 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 171 | self.check_read_perm()?; |
| 172 | if self.is_eof() { return Err(ByteIOError::EOF); } |
| 173 | let res = self.buf[self.pos]; |
| 174 | self.pos = self.pos + 1; |
| 175 | Ok(res) |
| 176 | } |
| 177 | |
| 178 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 179 | self.check_read_perm()?; |
| 180 | let copy_size = if self.size - self.pos < buf.len() { self.size } else { buf.len() }; |
| 181 | if copy_size == 0 { return Err(ByteIOError::EOF); } |
| 182 | for i in 0..copy_size { |
| 183 | buf[i] = self.buf[self.pos + i]; |
| 184 | } |
| 185 | self.pos += copy_size; |
| 186 | Ok(copy_size) |
| 187 | } |
| 188 | |
| 189 | #[allow(unused_variables)] |
| 190 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> { |
| 191 | self.check_write_perm()?; |
| 192 | Err(ByteIOError::NotImplemented) |
| 193 | } |
| 194 | |
| 195 | fn tell(&mut self) -> u64 { |
| 196 | self.pos as u64 |
| 197 | } |
| 198 | |
| 199 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 200 | let cur_pos = self.pos as i64; |
| 201 | let cur_size = self.size as i64; |
| 202 | match pos { |
| 203 | SeekFrom::Start(x) => self.real_seek(x as i64), |
| 204 | SeekFrom::Current(x) => self.real_seek(cur_pos + x), |
| 205 | SeekFrom::End(x) => self.real_seek(cur_size + x), |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | fn is_eof(&mut self) -> bool { |
| 210 | self.pos >= self.size |
| 211 | } |
| 212 | |
| 213 | fn is_seekable(&mut self) -> bool { |
| 214 | true |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | impl<'a> FileReader<'a> { |
| 219 | |
| 220 | pub fn new_read(file: &'a mut File) -> Self { |
| 221 | FileReader { file: file, eof : false } |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | impl<'a> ByteIO for FileReader<'a> { |
| 226 | fn read_byte(&mut self) -> ByteIOResult<u8> { |
| 227 | let mut byte : [u8; 1] = [0]; |
| 228 | let err = self.file.read(&mut byte); |
| 229 | if let Err(_) = err { return Err(ByteIOError::ReadError); } |
| 230 | let sz = err.unwrap(); |
| 231 | if sz == 0 { self.eof = true; return Err(ByteIOError::EOF); } |
| 232 | Ok (byte[0]) |
| 233 | } |
| 234 | |
| 235 | fn read_buf(&mut self, buf: &mut [u8]) -> ByteIOResult<usize> { |
| 236 | let res = self.file.read(buf); |
| 237 | if let Err(_) = res { return Err(ByteIOError::ReadError); } |
| 238 | let sz = res.unwrap(); |
| 239 | if sz < buf.len() { self.eof = true; } |
| 240 | Ok(sz) |
| 241 | } |
| 242 | |
| 243 | #[allow(unused_variables)] |
| 244 | fn write_buf(&mut self, buf: &[u8]) -> ByteIOResult<usize> { |
| 245 | Err(ByteIOError::NotImplemented) |
| 246 | } |
| 247 | |
| 248 | fn tell(&mut self) -> u64 { |
| 249 | self.file.seek(SeekFrom::Current(0)).unwrap() |
| 250 | } |
| 251 | |
| 252 | fn seek(&mut self, pos: SeekFrom) -> ByteIOResult<u64> { |
| 253 | let res = self.file.seek(pos); |
| 254 | match res { |
| 255 | Ok(r) => Ok(r), |
| 256 | Err(_) => Err(ByteIOError::SeekError), |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | fn is_eof(&mut self) -> bool { |
| 261 | self.eof |
| 262 | } |
| 263 | |
| 264 | fn is_seekable(&mut self) -> bool { |
| 265 | true |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | #[cfg(test)] |
| 270 | mod test { |
| 271 | use super::*; |
| 272 | use std::fs::File; |
| 273 | |
| 274 | #[test] |
| 275 | fn test_read() { |
| 276 | //const DATA : &'static [u8] = include_bytes!("../../assets/file"); |
| 277 | let buf: [u8; 64] = [1; 64]; |
| 278 | let mut mr = MemoryReader::new_read(&buf); |
| 279 | let mut reader = ByteReader::new(&mut mr); |
| 280 | assert_eq!(reader.read_byte().unwrap(), 0x01u8); |
| 281 | assert_eq!(reader.read_u16le().unwrap(), 0x0101u16); |
| 282 | assert_eq!(reader.read_u24le().unwrap(), 0x010101u32); |
| 283 | assert_eq!(reader.read_u32le().unwrap(), 0x01010101u32); |
| 284 | assert_eq!(reader.read_u64le().unwrap(), 0x0101010101010101u64); |
| 285 | let mut file = File::open("assets/MaoMacha.asx").unwrap(); |
| 286 | let mut fr = FileReader::new_read(&mut file); |
| 287 | let mut br2 = ByteReader::new(&mut fr); |
| 288 | assert_eq!(br2.read_byte().unwrap(), 0x30); |
| 289 | assert_eq!(br2.read_u24be().unwrap(), 0x26B275); |
| 290 | assert_eq!(br2.read_u24le().unwrap(), 0xCF668E); |
| 291 | assert_eq!(br2.read_u32be().unwrap(), 0x11A6D900); |
| 292 | assert_eq!(br2.read_u32le().unwrap(), 0xCE6200AA); |
| 293 | } |
| 294 | #[test] |
| 295 | fn test_write() { |
| 296 | } |
| 297 | } |