oculus1

annotate libovr/Src/Kernel/OVR_File.h @ 12:d797639e0234

find changesets by author, revision, files, or words in the commit message
moving on to the distortion... not correct yet
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 20 Sep 2013 10:14:29 +0300
parents e2f9e4603129
children
rev   line source
nuclear@3 1 /************************************************************************************
nuclear@3 2
nuclear@3 3 PublicHeader: Kernel
nuclear@3 4 Filename : OVR_File.h
nuclear@3 5 Content : Header for all internal file management - functions and structures
nuclear@3 6 to be inherited by OS specific subclasses.
nuclear@3 7 Created : September 19, 2012
nuclear@3 8 Notes :
nuclear@3 9
nuclear@3 10 Notes : errno may not be preserved across use of BaseFile member functions
nuclear@3 11 : Directories cannot be deleted while files opened from them are in use
nuclear@3 12 (For the GetFullName function)
nuclear@3 13
nuclear@3 14 Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.
nuclear@3 15
nuclear@3 16 Use of this software is subject to the terms of the Oculus license
nuclear@3 17 agreement provided at the time of installation or download, or which
nuclear@3 18 otherwise accompanies this software in either electronic or hard copy form.
nuclear@3 19
nuclear@3 20 ************************************************************************************/
nuclear@3 21
nuclear@3 22 #ifndef OVR_File_h
nuclear@3 23 #define OVR_File_h
nuclear@3 24
nuclear@3 25 #include "OVR_RefCount.h"
nuclear@3 26 #include "OVR_Std.h"
nuclear@3 27 #include "OVR_Alg.h"
nuclear@3 28
nuclear@3 29 #include <stdio.h>
nuclear@3 30 #include "OVR_String.h"
nuclear@3 31
nuclear@3 32 namespace OVR {
nuclear@3 33
nuclear@3 34 // ***** Declared classes
nuclear@3 35 class FileConstants;
nuclear@3 36 class File;
nuclear@3 37 class DelegatedFile;
nuclear@3 38 class BufferedFile;
nuclear@3 39
nuclear@3 40
nuclear@3 41 // ***** Flags for File & Directory accesses
nuclear@3 42
nuclear@3 43 class FileConstants
nuclear@3 44 {
nuclear@3 45 public:
nuclear@3 46
nuclear@3 47 // *** File open flags
nuclear@3 48 enum OpenFlags
nuclear@3 49 {
nuclear@3 50 Open_Read = 1,
nuclear@3 51 Open_Write = 2,
nuclear@3 52 Open_ReadWrite = 3,
nuclear@3 53
nuclear@3 54 // Opens file and truncates it to zero length
nuclear@3 55 // - file must have write permission
nuclear@3 56 // - when used with Create, it opens an existing
nuclear@3 57 // file and empties it or creates a new file
nuclear@3 58 Open_Truncate = 4,
nuclear@3 59
nuclear@3 60 // Creates and opens new file
nuclear@3 61 // - does not erase contents if file already
nuclear@3 62 // exists unless combined with Truncate
nuclear@3 63 Open_Create = 8,
nuclear@3 64
nuclear@3 65 // Returns an error value if the file already exists
nuclear@3 66 Open_CreateOnly = 24,
nuclear@3 67
nuclear@3 68 // Open file with buffering
nuclear@3 69 Open_Buffered = 32
nuclear@3 70 };
nuclear@3 71
nuclear@3 72 // *** File Mode flags
nuclear@3 73 enum Modes
nuclear@3 74 {
nuclear@3 75 Mode_Read = 0444,
nuclear@3 76 Mode_Write = 0222,
nuclear@3 77 Mode_Execute = 0111,
nuclear@3 78
nuclear@3 79 Mode_ReadWrite = 0666
nuclear@3 80 };
nuclear@3 81
nuclear@3 82 // *** Seek operations
nuclear@3 83 enum SeekOps
nuclear@3 84 {
nuclear@3 85 Seek_Set = 0,
nuclear@3 86 Seek_Cur = 1,
nuclear@3 87 Seek_End = 2
nuclear@3 88 };
nuclear@3 89
nuclear@3 90 // *** Errors
nuclear@3 91 enum Errors
nuclear@3 92 {
nuclear@3 93 Error_FileNotFound = 0x1001,
nuclear@3 94 Error_Access = 0x1002,
nuclear@3 95 Error_IOError = 0x1003,
nuclear@3 96 Error_DiskFull = 0x1004
nuclear@3 97 };
nuclear@3 98 };
nuclear@3 99
nuclear@3 100
nuclear@3 101 //-----------------------------------------------------------------------------------
nuclear@3 102 // ***** File Class
nuclear@3 103
nuclear@3 104 // The pure virtual base random-access file
nuclear@3 105 // This is a base class to all files
nuclear@3 106
nuclear@3 107 class File : public RefCountBase<File>, public FileConstants
nuclear@3 108 {
nuclear@3 109 public:
nuclear@3 110 File() { }
nuclear@3 111 // ** Location Information
nuclear@3 112
nuclear@3 113 // Returns a file name path relative to the 'reference' directory
nuclear@3 114 // This is often a path that was used to create a file
nuclear@3 115 // (this is not a global path, global path can be obtained with help of directory)
nuclear@3 116 virtual const char* GetFilePath() = 0;
nuclear@3 117
nuclear@3 118
nuclear@3 119 // ** File Information
nuclear@3 120
nuclear@3 121 // Return 1 if file's usable (open)
nuclear@3 122 virtual bool IsValid() = 0;
nuclear@3 123 // Return 1 if file's writable, otherwise 0
nuclear@3 124 virtual bool IsWritable() = 0;
nuclear@3 125
nuclear@3 126 // Return position
nuclear@3 127 virtual int Tell() = 0;
nuclear@3 128 virtual SInt64 LTell() = 0;
nuclear@3 129
nuclear@3 130 // File size
nuclear@3 131 virtual int GetLength() = 0;
nuclear@3 132 virtual SInt64 LGetLength() = 0;
nuclear@3 133
nuclear@3 134 // Returns file stats
nuclear@3 135 // 0 for failure
nuclear@3 136 //virtual bool Stat(FileStats *pfs) = 0;
nuclear@3 137
nuclear@3 138 // Return errno-based error code
nuclear@3 139 // Useful if any other function failed
nuclear@3 140 virtual int GetErrorCode() = 0;
nuclear@3 141
nuclear@3 142
nuclear@3 143 // ** Stream implementation & I/O
nuclear@3 144
nuclear@3 145 // Blocking write, will write in the given number of bytes to the stream
nuclear@3 146 // Returns : -1 for error
nuclear@3 147 // Otherwise number of bytes read
nuclear@3 148 virtual int Write(const UByte *pbufer, int numBytes) = 0;
nuclear@3 149 // Blocking read, will read in the given number of bytes or less from the stream
nuclear@3 150 // Returns : -1 for error
nuclear@3 151 // Otherwise number of bytes read,
nuclear@3 152 // if 0 or < numBytes, no more bytes available; end of file or the other side of stream is closed
nuclear@3 153 virtual int Read(UByte *pbufer, int numBytes) = 0;
nuclear@3 154
nuclear@3 155 // Skips (ignores) a given # of bytes
nuclear@3 156 // Same return values as Read
nuclear@3 157 virtual int SkipBytes(int numBytes) = 0;
nuclear@3 158
nuclear@3 159 // Returns the number of bytes available to read from a stream without blocking
nuclear@3 160 // For a file, this should generally be number of bytes to the end
nuclear@3 161 virtual int BytesAvailable() = 0;
nuclear@3 162
nuclear@3 163 // Causes any implementation's buffered data to be delivered to destination
nuclear@3 164 // Return 0 for error
nuclear@3 165 virtual bool Flush() = 0;
nuclear@3 166
nuclear@3 167
nuclear@3 168 // Need to provide a more optimized implementation that doe snot necessarily involve a lot of seeking
nuclear@3 169 inline bool IsEOF() { return !BytesAvailable(); }
nuclear@3 170
nuclear@3 171
nuclear@3 172 // Seeking
nuclear@3 173 // Returns new position, -1 for error
nuclear@3 174 virtual int Seek(int offset, int origin=Seek_Set) = 0;
nuclear@3 175 virtual SInt64 LSeek(SInt64 offset, int origin=Seek_Set) = 0;
nuclear@3 176 // Seek simplification
nuclear@3 177 int SeekToBegin() {return Seek(0); }
nuclear@3 178 int SeekToEnd() {return Seek(0,Seek_End); }
nuclear@3 179 int Skip(int numBytes) {return Seek(numBytes,Seek_Cur); }
nuclear@3 180
nuclear@3 181
nuclear@3 182 // Appends other file data from a stream
nuclear@3 183 // Return -1 for error, else # of bytes written
nuclear@3 184 virtual int CopyFromStream(File *pstream, int byteSize) = 0;
nuclear@3 185
nuclear@3 186 // Closes the file
nuclear@3 187 // After close, file cannot be accessed
nuclear@3 188 virtual bool Close() = 0;
nuclear@3 189
nuclear@3 190
nuclear@3 191 // ***** Inlines for convenient primitive type serialization
nuclear@3 192
nuclear@3 193 // Read/Write helpers
nuclear@3 194 private:
nuclear@3 195 UInt64 PRead64() { UInt64 v = 0; Read((UByte*)&v, 8); return v; }
nuclear@3 196 UInt32 PRead32() { UInt32 v = 0; Read((UByte*)&v, 4); return v; }
nuclear@3 197 UInt16 PRead16() { UInt16 v = 0; Read((UByte*)&v, 2); return v; }
nuclear@3 198 UByte PRead8() { UByte v = 0; Read((UByte*)&v, 1); return v; }
nuclear@3 199 void PWrite64(UInt64 v) { Write((UByte*)&v, 8); }
nuclear@3 200 void PWrite32(UInt32 v) { Write((UByte*)&v, 4); }
nuclear@3 201 void PWrite16(UInt16 v) { Write((UByte*)&v, 2); }
nuclear@3 202 void PWrite8(UByte v) { Write((UByte*)&v, 1); }
nuclear@3 203
nuclear@3 204 public:
nuclear@3 205
nuclear@3 206 // Writing primitive types - Little Endian
nuclear@3 207 inline void WriteUByte(UByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 208 inline void WriteSByte(SByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 209 inline void WriteUInt8(UByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 210 inline void WriteSInt8(SByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 211 inline void WriteUInt16(UInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 212 inline void WriteSInt16(SInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 213 inline void WriteUInt32(UInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 214 inline void WriteSInt32(SInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 215 inline void WriteUInt64(UInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 216 inline void WriteSInt64(SInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToLE(v)); }
nuclear@3 217 inline void WriteFloat(float v) { v = Alg::ByteUtil::SystemToLE(v); Write((UByte*)&v, 4); }
nuclear@3 218 inline void WriteDouble(double v) { v = Alg::ByteUtil::SystemToLE(v); Write((UByte*)&v, 8); }
nuclear@3 219 // Writing primitive types - Big Endian
nuclear@3 220 inline void WriteUByteBE(UByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 221 inline void WriteSByteBE(SByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 222 inline void WriteUInt8BE(UInt16 v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 223 inline void WriteSInt8BE(SInt16 v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 224 inline void WriteUInt16BE(UInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 225 inline void WriteSInt16BE(UInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 226 inline void WriteUInt32BE(UInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 227 inline void WriteSInt32BE(UInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 228 inline void WriteUInt64BE(UInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 229 inline void WriteSInt64BE(UInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToBE(v)); }
nuclear@3 230 inline void WriteFloatBE(float v) { v = Alg::ByteUtil::SystemToBE(v); Write((UByte*)&v, 4); }
nuclear@3 231 inline void WriteDoubleBE(double v) { v = Alg::ByteUtil::SystemToBE(v); Write((UByte*)&v, 8); }
nuclear@3 232
nuclear@3 233 // Reading primitive types - Little Endian
nuclear@3 234 inline UByte ReadUByte() { return (UByte)Alg::ByteUtil::LEToSystem(PRead8()); }
nuclear@3 235 inline SByte ReadSByte() { return (SByte)Alg::ByteUtil::LEToSystem(PRead8()); }
nuclear@3 236 inline UByte ReadUInt8() { return (UByte)Alg::ByteUtil::LEToSystem(PRead8()); }
nuclear@3 237 inline SByte ReadSInt8() { return (SByte)Alg::ByteUtil::LEToSystem(PRead8()); }
nuclear@3 238 inline UInt16 ReadUInt16() { return (UInt16)Alg::ByteUtil::LEToSystem(PRead16()); }
nuclear@3 239 inline SInt16 ReadSInt16() { return (SInt16)Alg::ByteUtil::LEToSystem(PRead16()); }
nuclear@3 240 inline UInt32 ReadUInt32() { return (UInt32)Alg::ByteUtil::LEToSystem(PRead32()); }
nuclear@3 241 inline SInt32 ReadSInt32() { return (SInt32)Alg::ByteUtil::LEToSystem(PRead32()); }
nuclear@3 242 inline UInt64 ReadUInt64() { return (UInt64)Alg::ByteUtil::LEToSystem(PRead64()); }
nuclear@3 243 inline SInt64 ReadSInt64() { return (SInt64)Alg::ByteUtil::LEToSystem(PRead64()); }
nuclear@3 244 inline float ReadFloat() { float v = 0.0f; Read((UByte*)&v, 4); return Alg::ByteUtil::LEToSystem(v); }
nuclear@3 245 inline double ReadDouble() { double v = 0.0; Read((UByte*)&v, 8); return Alg::ByteUtil::LEToSystem(v); }
nuclear@3 246 // Reading primitive types - Big Endian
nuclear@3 247 inline UByte ReadUByteBE() { return (UByte)Alg::ByteUtil::BEToSystem(PRead8()); }
nuclear@3 248 inline SByte ReadSByteBE() { return (SByte)Alg::ByteUtil::BEToSystem(PRead8()); }
nuclear@3 249 inline UByte ReadUInt8BE() { return (UByte)Alg::ByteUtil::BEToSystem(PRead8()); }
nuclear@3 250 inline SByte ReadSInt8BE() { return (SByte)Alg::ByteUtil::BEToSystem(PRead8()); }
nuclear@3 251 inline UInt16 ReadUInt16BE() { return (UInt16)Alg::ByteUtil::BEToSystem(PRead16()); }
nuclear@3 252 inline SInt16 ReadSInt16BE() { return (SInt16)Alg::ByteUtil::BEToSystem(PRead16()); }
nuclear@3 253 inline UInt32 ReadUInt32BE() { return (UInt32)Alg::ByteUtil::BEToSystem(PRead32()); }
nuclear@3 254 inline SInt32 ReadSInt32BE() { return (SInt32)Alg::ByteUtil::BEToSystem(PRead32()); }
nuclear@3 255 inline UInt64 ReadUInt64BE() { return (UInt64)Alg::ByteUtil::BEToSystem(PRead64()); }
nuclear@3 256 inline SInt64 ReadSInt64BE() { return (SInt64)Alg::ByteUtil::BEToSystem(PRead64()); }
nuclear@3 257 inline float ReadFloatBE() { float v = 0.0f; Read((UByte*)&v, 4); return Alg::ByteUtil::BEToSystem(v); }
nuclear@3 258 inline double ReadDoubleBE() { double v = 0.0; Read((UByte*)&v, 8); return Alg::ByteUtil::BEToSystem(v); }
nuclear@3 259 };
nuclear@3 260
nuclear@3 261
nuclear@3 262 // *** Delegated File
nuclear@3 263
nuclear@3 264 class DelegatedFile : public File
nuclear@3 265 {
nuclear@3 266 protected:
nuclear@3 267 // Delegating file pointer
nuclear@3 268 Ptr<File> pFile;
nuclear@3 269
nuclear@3 270 // Hidden default constructor
nuclear@3 271 DelegatedFile() : pFile(0) { }
nuclear@3 272 DelegatedFile(const DelegatedFile &source) : File() { OVR_UNUSED(source); }
nuclear@3 273 public:
nuclear@3 274 // Constructors
nuclear@3 275 DelegatedFile(File *pfile) : pFile(pfile) { }
nuclear@3 276
nuclear@3 277 // ** Location Information
nuclear@3 278 virtual const char* GetFilePath() { return pFile->GetFilePath(); }
nuclear@3 279
nuclear@3 280 // ** File Information
nuclear@3 281 virtual bool IsValid() { return pFile && pFile->IsValid(); }
nuclear@3 282 virtual bool IsWritable() { return pFile->IsWritable(); }
nuclear@3 283 // virtual bool IsRecoverable() { return pFile->IsRecoverable(); }
nuclear@3 284
nuclear@3 285 virtual int Tell() { return pFile->Tell(); }
nuclear@3 286 virtual SInt64 LTell() { return pFile->LTell(); }
nuclear@3 287
nuclear@3 288 virtual int GetLength() { return pFile->GetLength(); }
nuclear@3 289 virtual SInt64 LGetLength() { return pFile->LGetLength(); }
nuclear@3 290
nuclear@3 291 //virtual bool Stat(FileStats *pfs) { return pFile->Stat(pfs); }
nuclear@3 292
nuclear@3 293 virtual int GetErrorCode() { return pFile->GetErrorCode(); }
nuclear@3 294
nuclear@3 295 // ** Stream implementation & I/O
nuclear@3 296 virtual int Write(const UByte *pbuffer, int numBytes) { return pFile->Write(pbuffer,numBytes); }
nuclear@3 297 virtual int Read(UByte *pbuffer, int numBytes) { return pFile->Read(pbuffer,numBytes); }
nuclear@3 298
nuclear@3 299 virtual int SkipBytes(int numBytes) { return pFile->SkipBytes(numBytes); }
nuclear@3 300
nuclear@3 301 virtual int BytesAvailable() { return pFile->BytesAvailable(); }
nuclear@3 302
nuclear@3 303 virtual bool Flush() { return pFile->Flush(); }
nuclear@3 304
nuclear@3 305 // Seeking
nuclear@3 306 virtual int Seek(int offset, int origin=Seek_Set) { return pFile->Seek(offset,origin); }
nuclear@3 307 virtual SInt64 LSeek(SInt64 offset, int origin=Seek_Set) { return pFile->LSeek(offset,origin); }
nuclear@3 308
nuclear@3 309 virtual int CopyFromStream(File *pstream, int byteSize) { return pFile->CopyFromStream(pstream,byteSize); }
nuclear@3 310
nuclear@3 311 // Closing the file
nuclear@3 312 virtual bool Close() { return pFile->Close(); }
nuclear@3 313 };
nuclear@3 314
nuclear@3 315
nuclear@3 316 //-----------------------------------------------------------------------------------
nuclear@3 317 // ***** Buffered File
nuclear@3 318
nuclear@3 319 // This file class adds buffering to an existing file
nuclear@3 320 // Buffered file never fails by itself; if there's not
nuclear@3 321 // enough memory for buffer, no buffer's used
nuclear@3 322
nuclear@3 323 class BufferedFile : public DelegatedFile
nuclear@3 324 {
nuclear@3 325 protected:
nuclear@3 326 enum BufferModeType
nuclear@3 327 {
nuclear@3 328 NoBuffer,
nuclear@3 329 ReadBuffer,
nuclear@3 330 WriteBuffer
nuclear@3 331 };
nuclear@3 332
nuclear@3 333 // Buffer & the mode it's in
nuclear@3 334 UByte* pBuffer;
nuclear@3 335 BufferModeType BufferMode;
nuclear@3 336 // Position in buffer
nuclear@3 337 unsigned Pos;
nuclear@3 338 // Data in buffer if reading
nuclear@3 339 unsigned DataSize;
nuclear@3 340 // Underlying file position
nuclear@3 341 UInt64 FilePos;
nuclear@3 342
nuclear@3 343 // Initializes buffering to a certain mode
nuclear@3 344 bool SetBufferMode(BufferModeType mode);
nuclear@3 345 // Flushes buffer
nuclear@3 346 // WriteBuffer - write data to disk, ReadBuffer - reset buffer & fix file position
nuclear@3 347 void FlushBuffer();
nuclear@3 348 // Loads data into ReadBuffer
nuclear@3 349 // WARNING: Right now LoadBuffer() assumes the buffer's empty
nuclear@3 350 void LoadBuffer();
nuclear@3 351
nuclear@3 352 // Hidden constructor
nuclear@3 353 BufferedFile();
nuclear@3 354 inline BufferedFile(const BufferedFile &source) : DelegatedFile() { OVR_UNUSED(source); }
nuclear@3 355 public:
nuclear@3 356
nuclear@3 357 // Constructor
nuclear@3 358 // - takes another file as source
nuclear@3 359 BufferedFile(File *pfile);
nuclear@3 360 ~BufferedFile();
nuclear@3 361
nuclear@3 362
nuclear@3 363 // ** Overridden functions
nuclear@3 364
nuclear@3 365 // We override all the functions that can possibly
nuclear@3 366 // require buffer mode switch, flush, or extra calculations
nuclear@3 367 virtual int Tell();
nuclear@3 368 virtual SInt64 LTell();
nuclear@3 369
nuclear@3 370 virtual int GetLength();
nuclear@3 371 virtual SInt64 LGetLength();
nuclear@3 372
nuclear@3 373 // virtual bool Stat(GFileStats *pfs);
nuclear@3 374
nuclear@3 375 virtual int Write(const UByte *pbufer, int numBytes);
nuclear@3 376 virtual int Read(UByte *pbufer, int numBytes);
nuclear@3 377
nuclear@3 378 virtual int SkipBytes(int numBytes);
nuclear@3 379
nuclear@3 380 virtual int BytesAvailable();
nuclear@3 381
nuclear@3 382 virtual bool Flush();
nuclear@3 383
nuclear@3 384 virtual int Seek(int offset, int origin=Seek_Set);
nuclear@3 385 virtual SInt64 LSeek(SInt64 offset, int origin=Seek_Set);
nuclear@3 386
nuclear@3 387 virtual int CopyFromStream(File *pstream, int byteSize);
nuclear@3 388
nuclear@3 389 virtual bool Close();
nuclear@3 390 };
nuclear@3 391
nuclear@3 392
nuclear@3 393 //-----------------------------------------------------------------------------------
nuclear@3 394 // ***** Memory File
nuclear@3 395
nuclear@3 396 class MemoryFile : public File
nuclear@3 397 {
nuclear@3 398 public:
nuclear@3 399
nuclear@3 400 const char* GetFilePath() { return FilePath.ToCStr(); }
nuclear@3 401
nuclear@3 402 bool IsValid() { return Valid; }
nuclear@3 403 bool IsWritable() { return false; }
nuclear@3 404
nuclear@3 405 bool Flush() { return true; }
nuclear@3 406 int GetErrorCode() { return 0; }
nuclear@3 407
nuclear@3 408 int Tell() { return FileIndex; }
nuclear@3 409 SInt64 LTell() { return (SInt64) FileIndex; }
nuclear@3 410
nuclear@3 411 int GetLength() { return FileSize; }
nuclear@3 412 SInt64 LGetLength() { return (SInt64) FileSize; }
nuclear@3 413
nuclear@3 414 bool Close()
nuclear@3 415 {
nuclear@3 416 Valid = false;
nuclear@3 417 return false;
nuclear@3 418 }
nuclear@3 419
nuclear@3 420 int CopyFromStream(File *pstream, int byteSize)
nuclear@3 421 { OVR_UNUSED2(pstream, byteSize);
nuclear@3 422 return 0;
nuclear@3 423 }
nuclear@3 424
nuclear@3 425 int Write(const UByte *pbuffer, int numBytes)
nuclear@3 426 { OVR_UNUSED2(pbuffer, numBytes);
nuclear@3 427 return 0;
nuclear@3 428 }
nuclear@3 429
nuclear@3 430 int Read(UByte *pbufer, int numBytes)
nuclear@3 431 {
nuclear@3 432 if (FileIndex + numBytes > FileSize)
nuclear@3 433 {
nuclear@3 434 numBytes = FileSize - FileIndex;
nuclear@3 435 }
nuclear@3 436
nuclear@3 437 if (numBytes > 0)
nuclear@3 438 {
nuclear@3 439 ::memcpy (pbufer, &FileData [FileIndex], numBytes);
nuclear@3 440
nuclear@3 441 FileIndex += numBytes;
nuclear@3 442 }
nuclear@3 443
nuclear@3 444 return numBytes;
nuclear@3 445 }
nuclear@3 446
nuclear@3 447 int SkipBytes(int numBytes)
nuclear@3 448 {
nuclear@3 449 if (FileIndex + numBytes > FileSize)
nuclear@3 450 {
nuclear@3 451 numBytes = FileSize - FileIndex;
nuclear@3 452 }
nuclear@3 453
nuclear@3 454 FileIndex += numBytes;
nuclear@3 455
nuclear@3 456 return numBytes;
nuclear@3 457 }
nuclear@3 458
nuclear@3 459 int BytesAvailable()
nuclear@3 460 {
nuclear@3 461 return (FileSize - FileIndex);
nuclear@3 462 }
nuclear@3 463
nuclear@3 464 int Seek(int offset, int origin = Seek_Set)
nuclear@3 465 {
nuclear@3 466 switch (origin)
nuclear@3 467 {
nuclear@3 468 case Seek_Set : FileIndex = offset; break;
nuclear@3 469 case Seek_Cur : FileIndex += offset; break;
nuclear@3 470 case Seek_End : FileIndex = FileSize - offset; break;
nuclear@3 471 }
nuclear@3 472
nuclear@3 473 return FileIndex;
nuclear@3 474 }
nuclear@3 475
nuclear@3 476 SInt64 LSeek(SInt64 offset, int origin = Seek_Set)
nuclear@3 477 {
nuclear@3 478 return (SInt64) Seek((int) offset, origin);
nuclear@3 479 }
nuclear@3 480
nuclear@3 481 public:
nuclear@3 482
nuclear@3 483 MemoryFile (const String& fileName, const UByte *pBuffer, int buffSize)
nuclear@3 484 : FilePath(fileName)
nuclear@3 485 {
nuclear@3 486 FileData = pBuffer;
nuclear@3 487 FileSize = buffSize;
nuclear@3 488 FileIndex = 0;
nuclear@3 489 Valid = (!fileName.IsEmpty() && pBuffer && buffSize > 0) ? true : false;
nuclear@3 490 }
nuclear@3 491
nuclear@3 492 // pfileName should be encoded as UTF-8 to support international file names.
nuclear@3 493 MemoryFile (const char* pfileName, const UByte *pBuffer, int buffSize)
nuclear@3 494 : FilePath(pfileName)
nuclear@3 495 {
nuclear@3 496 FileData = pBuffer;
nuclear@3 497 FileSize = buffSize;
nuclear@3 498 FileIndex = 0;
nuclear@3 499 Valid = (pfileName && pBuffer && buffSize > 0) ? true : false;
nuclear@3 500 }
nuclear@3 501 private:
nuclear@3 502
nuclear@3 503 String FilePath;
nuclear@3 504 const UByte *FileData;
nuclear@3 505 int FileSize;
nuclear@3 506 int FileIndex;
nuclear@3 507 bool Valid;
nuclear@3 508 };
nuclear@3 509
nuclear@3 510
nuclear@3 511 // ***** Global path helpers
nuclear@3 512
nuclear@3 513 // Find trailing short filename in a path.
nuclear@3 514 const char* OVR_CDECL GetShortFilename(const char* purl);
nuclear@3 515
nuclear@3 516 } // OVR
nuclear@3 517
nuclear@3 518 #endif