mcs/class/corlib/System.IO/BinaryWriter.cs

   1 //
   2 // System.IO.BinaryWriter
   3 //
   4 // Author:
   5 //   Matt Kimball (matt@kimball.net)
   6 //
   7
   8 using System;
   9 using System.Text;
  10 using System.Globalization;
  11
  12 namespace System.IO {
  13         [Serializable]
  14         public class BinaryWriter : IDisposable {
  15
  16                 // Null is a BinaryWriter with no backing store.
  17                 public static readonly BinaryWriter Null;
  18
  19                 protected Stream OutStream;
  20                 private Encoding m_encoding;
  21                 private byte [] buffer;
  22                 private bool disposed = false;
  23
  24                 static BinaryWriter() {
  25                         Null = new BinaryWriter();
  26                 }
  27
  28                 protected BinaryWriter() : this (Stream.Null, Encoding.UTF8Unmarked) {
  29                 }
  30
  31                 public BinaryWriter(Stream output) : this(output, Encoding.UTF8Unmarked) {
  32                 }
  33
  34                 public BinaryWriter(Stream output, Encoding encoding) {
  35                         if (output == null || encoding == null)
  36                                 throw new ArgumentNullException(Locale.GetText ("Output or Encoding is a null reference."));
  37                         if (!output.CanWrite)
  38                                 throw new ArgumentException(Locale.GetText ("Stream does not support writing or already closed."));
  39
  40                         OutStream = output;
  41                         m_encoding = encoding;
  42                         buffer = new byte [16];
  43                 }
  44
  45                 public virtual Stream BaseStream {
  46                         get {
  47                                 return OutStream;
  48                         }
  49                 }
  50
  51                 public virtual void Close() {
  52                         Dispose (true);
  53                 }
  54
  55                 void IDisposable.Dispose() {
  56                         Dispose (true);
  57                 }
  58
  59                 protected virtual void Dispose (bool disposing)
  60                 {
  61                         if (disposing && OutStream != null)
  62                                 OutStream.Close();
  63
  64                         buffer = null;
  65                         m_encoding = null;
  66                         disposed = true;
  67                 }
  68
  69                 public virtual void Flush() {
  70                         OutStream.Flush();
  71                 }
  72
  73                 public virtual long Seek(int offset, SeekOrigin origin) {
  74
  75                         return OutStream.Seek(offset, origin);
  76                 }
  77
  78                 public virtual void Write(bool value) {
  79
  80                         if (disposed)
  81                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  82
  83                         buffer [0] = (byte) (value ? 1 : 0);
  84                         OutStream.Write(buffer, 0, 1);
  85                 }
  86
  87                 public virtual void Write(byte value) {
  88
  89                         if (disposed)
  90                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  91
  92                         OutStream.WriteByte(value);
  93                 }
  94
  95                 public virtual void Write(byte[] value) {
  96
  97                         if (disposed)
  98                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
  99
 100                         if (value == null)
 101                                 throw new ArgumentNullException(Locale.GetText ("Byte buffer is a null reference."));
 102                         OutStream.Write(value, 0, value.Length);
 103                 }
 104
 105                 public virtual void Write(byte[] value, int offset, int length) {
 106
 107                         if (disposed)
 108                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 109
 110                         if (value == null)
 111                                 throw new ArgumentNullException(Locale.GetText ("Byte buffer is a null reference."));
 112                         OutStream.Write(value, offset, length);
 113                 }
 114
 115                 public virtual void Write(char value) {
 116
 117                         if (disposed)
 118                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 119
 120                         char[] dec = new char[1];
 121                         dec[0] = value;
 122                         byte[] enc = m_encoding.GetBytes(dec, 0, 1);
 123                         OutStream.Write(enc, 0, enc.Length);
 124                 }
 125
 126                 public virtual void Write(char[] value) {
 127
 128                         if (disposed)
 129                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 130
 131                         if (value == null)
 132                                 throw new ArgumentNullException(Locale.GetText ("Chars is a null reference."));
 133                         byte[] enc = m_encoding.GetBytes(value, 0, value.Length);
 134                         OutStream.Write(enc, 0, enc.Length);
 135                 }
 136
 137                 public virtual void Write(char[] value, int offset, int length) {
 138
 139                         if (disposed)
 140                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 141
 142                         if (value == null)
 143                                 throw new ArgumentNullException(Locale.GetText ("Chars is a null reference."));
 144                         byte[] enc = m_encoding.GetBytes(value, offset, length);
 145                         OutStream.Write(enc, 0, enc.Length);
 146                 }
 147
 148                 unsafe public virtual void Write(decimal value) {
 149
 150                         if (disposed)
 151                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 152
 153                         byte* value_ptr = (byte *)&value;
 154                         for (int i = 0; i < 16; i++) {
 155
 156                                 /*
 157                                  * decimal in stream is lo32, mi32, hi32, ss32
 158                                  * but its internal structure si ss32, hi32, lo32, mi32
 159                                  */
 160                                 if (i < 4)
 161                                         buffer [i + 12] = value_ptr [i];
 162                                 else if (i < 8)
 163                                         buffer [i + 4] = value_ptr [i];
 164                                 else if (i < 12)
 165                                         buffer [i - 8] = value_ptr [i];
 166                                 else
 167                                         buffer [i - 8] = value_ptr [i];
 168                         }
 169
 170                         OutStream.Write(buffer, 0, 16);
 171                 }
 172
 173                 public virtual void Write(double value) {
 174
 175                         if (disposed)
 176                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 177
 178                         OutStream.Write(BitConverter.GetBytes(value), 0, 8);
 179                 }
 180
 181                 public virtual void Write(short value) {
 182
 183                         if (disposed)
 184                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 185
 186                         buffer [0] = (byte) value;
 187                         buffer [1] = (byte) (value >> 8);
 188                         OutStream.Write(buffer, 0, 2);
 189                 }
 190
 191                 public virtual void Write(int value) {
 192
 193                         if (disposed)
 194                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 195
 196                         buffer [0] = (byte) value;
 197                         buffer [1] = (byte) (value >> 8);
 198                         buffer [2] = (byte) (value >> 16);
 199                         buffer [3] = (byte) (value >> 24);
 200                         OutStream.Write(buffer, 0, 4);
 201                 }
 202
 203                 public virtual void Write(long value) {
 204
 205                         if (disposed)
 206                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 207
 208                         for (int i = 0, sh = 0; i < 8; i++, sh += 8)
 209                                 buffer [i] = (byte) (value >> sh);
 210                         OutStream.Write(buffer, 0, 8);
 211                 }
 212
 213                 [CLSCompliant(false)]
 214                 public virtual void Write(sbyte value) {
 215
 216                         if (disposed)
 217                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 218
 219                         buffer [0] = (byte) value;
 220                         OutStream.Write(buffer, 0, 1);
 221                 }
 222
 223                 public virtual void Write(float value) {
 224
 225                         if (disposed)
 226                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 227
 228                         OutStream.Write(BitConverter.GetBytes(value), 0, 4);
 229                 }
 230
 231                 byte [] stringBuffer;
 232                 int maxCharsPerRound;
 233
 234                 public virtual void Write(string value) {
 235
 236                         if (disposed)
 237                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 238
 239                         int len = m_encoding.GetByteCount (value);
 240                         Write7BitEncodedInt (len);
 241
 242                         if (stringBuffer == null) {
 243                                 stringBuffer = new byte [512];
 244                                 maxCharsPerRound = 512 / m_encoding.GetMaxByteCount (1);
 245                         }
 246
 247                         int chpos = 0;
 248                         int chrem = value.Length;
 249                         while (chrem > 0) {
 250                                 int cch = (chrem > maxCharsPerRound) ? maxCharsPerRound : chrem;
 251                                 int blen = m_encoding.GetBytes (value, chpos, cch, stringBuffer, 0);
 252                                 OutStream.Write (stringBuffer, 0, blen);
 253
 254                                 chpos += cch;
 255                                 chrem -= cch;
 256                         }
 257                 }
 258
 259                 [CLSCompliant(false)]
 260                 public virtual void Write(ushort value) {
 261
 262                         if (disposed)
 263                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 264
 265                         buffer [0] = (byte) value;
 266                         buffer [1] = (byte) (value >> 8);
 267                         OutStream.Write(buffer, 0, 2);
 268                 }
 269
 270                 [CLSCompliant(false)]
 271                 public virtual void Write(uint value) {
 272
 273                         if (disposed)
 274                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 275
 276                         buffer [0] = (byte) value;
 277                         buffer [1] = (byte) (value >> 8);
 278                         buffer [2] = (byte) (value >> 16);
 279                         buffer [3] = (byte) (value >> 24);
 280                         OutStream.Write(buffer, 0, 4);
 281                 }
 282
 283                 [CLSCompliant(false)]
 284                 public virtual void Write(ulong value) {
 285
 286                         if (disposed)
 287                                 throw new ObjectDisposedException ("BinaryWriter", "Cannot write to a closed BinaryWriter");
 288
 289                         for (int i = 0, sh = 0; i < 8; i++, sh += 8)
 290                                 buffer [i] = (byte) (value >> sh);
 291                         OutStream.Write(buffer, 0, 8);
 292                 }
 293
 294                 protected void Write7BitEncodedInt(int value) {
 295                         do {
 296                                 int high = (value >> 7) & 0x01ffffff;
 297                                 byte b = (byte)(value & 0x7f);
 298
 299                                 if (high != 0) {
 300                                         b = (byte)(b | 0x80);
 301                                 }
 302
 303                                 Write(b);
 304                                 value = high;
 305                         } while(value != 0);
 306                 }
 307         }
 308 }