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annotate libovr/Src/Kernel/OVR_File.cpp @ 1:e2f9e4603129

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added LibOVR and started a simple vr wrapper.
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 14 Sep 2013 16:14:59 +0300
parents
children b069a5c27388
rev   line source
nuclear@1 1 /**************************************************************************
nuclear@1 2
nuclear@1 3 Filename : OVR_File.cpp
nuclear@1 4 Content : File wrapper class implementation (Win32)
nuclear@1 5
nuclear@1 6 Created : April 5, 1999
nuclear@1 7 Authors : Michael Antonov
nuclear@1 8
nuclear@1 9 Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.
nuclear@1 10
nuclear@1 11 Use of this software is subject to the terms of the Oculus license
nuclear@1 12 agreement provided at the time of installation or download, or which
nuclear@1 13 otherwise accompanies this software in either electronic or hard copy form.
nuclear@1 14
nuclear@1 15 **************************************************************************/
nuclear@1 16
nuclear@1 17 #define GFILE_CXX
nuclear@1 18
nuclear@1 19 // Standard C library (Captain Obvious guarantees!)
nuclear@1 20 #include <stdio.h>
nuclear@1 21
nuclear@1 22 #include "OVR_File.h"
nuclear@1 23
nuclear@1 24 namespace OVR {
nuclear@1 25
nuclear@1 26 // Buffered file adds buffering to an existing file
nuclear@1 27 // FILEBUFFER_SIZE defines the size of internal buffer, while
nuclear@1 28 // FILEBUFFER_TOLERANCE controls the amount of data we'll effectively try to buffer
nuclear@1 29 #define FILEBUFFER_SIZE (8192-8)
nuclear@1 30 #define FILEBUFFER_TOLERANCE 4096
nuclear@1 31
nuclear@1 32 // ** Constructor/Destructor
nuclear@1 33
nuclear@1 34 // Hidden constructor
nuclear@1 35 // Not supposed to be used
nuclear@1 36 BufferedFile::BufferedFile() : DelegatedFile(0)
nuclear@1 37 {
nuclear@1 38 pBuffer = (UByte*)OVR_ALLOC(FILEBUFFER_SIZE);
nuclear@1 39 BufferMode = NoBuffer;
nuclear@1 40 FilePos = 0;
nuclear@1 41 Pos = 0;
nuclear@1 42 DataSize = 0;
nuclear@1 43 }
nuclear@1 44
nuclear@1 45 // Takes another file as source
nuclear@1 46 BufferedFile::BufferedFile(File *pfile) : DelegatedFile(pfile)
nuclear@1 47 {
nuclear@1 48 pBuffer = (UByte*)OVR_ALLOC(FILEBUFFER_SIZE);
nuclear@1 49 BufferMode = NoBuffer;
nuclear@1 50 FilePos = pfile->LTell();
nuclear@1 51 Pos = 0;
nuclear@1 52 DataSize = 0;
nuclear@1 53 }
nuclear@1 54
nuclear@1 55
nuclear@1 56 // Destructor
nuclear@1 57 BufferedFile::~BufferedFile()
nuclear@1 58 {
nuclear@1 59 // Flush in case there's data
nuclear@1 60 if (pFile)
nuclear@1 61 FlushBuffer();
nuclear@1 62 // Get rid of buffer
nuclear@1 63 if (pBuffer)
nuclear@1 64 OVR_FREE(pBuffer);
nuclear@1 65 }
nuclear@1 66
nuclear@1 67 /*
nuclear@1 68 bool BufferedFile::VCopy(const Object &source)
nuclear@1 69 {
nuclear@1 70 if (!DelegatedFile::VCopy(source))
nuclear@1 71 return 0;
nuclear@1 72
nuclear@1 73 // Data members
nuclear@1 74 BufferedFile *psource = (BufferedFile*)&source;
nuclear@1 75
nuclear@1 76 // Buffer & the mode it's in
nuclear@1 77 pBuffer = psource->pBuffer;
nuclear@1 78 BufferMode = psource->BufferMode;
nuclear@1 79 Pos = psource->Pos;
nuclear@1 80 DataSize = psource->DataSize;
nuclear@1 81 return 1;
nuclear@1 82 }
nuclear@1 83 */
nuclear@1 84
nuclear@1 85 // Initializes buffering to a certain mode
nuclear@1 86 bool BufferedFile::SetBufferMode(BufferModeType mode)
nuclear@1 87 {
nuclear@1 88 if (!pBuffer)
nuclear@1 89 return false;
nuclear@1 90 if (mode == BufferMode)
nuclear@1 91 return true;
nuclear@1 92
nuclear@1 93 FlushBuffer();
nuclear@1 94
nuclear@1 95 // Can't set write mode if we can't write
nuclear@1 96 if ((mode==WriteBuffer) && (!pFile || !pFile->IsWritable()) )
nuclear@1 97 return 0;
nuclear@1 98
nuclear@1 99 // And SetMode
nuclear@1 100 BufferMode = mode;
nuclear@1 101 Pos = 0;
nuclear@1 102 DataSize = 0;
nuclear@1 103 return 1;
nuclear@1 104 }
nuclear@1 105
nuclear@1 106 // Flushes buffer
nuclear@1 107 void BufferedFile::FlushBuffer()
nuclear@1 108 {
nuclear@1 109 switch(BufferMode)
nuclear@1 110 {
nuclear@1 111 case WriteBuffer:
nuclear@1 112 // Write data in buffer
nuclear@1 113 FilePos += pFile->Write(pBuffer,Pos);
nuclear@1 114 Pos = 0;
nuclear@1 115 break;
nuclear@1 116
nuclear@1 117 case ReadBuffer:
nuclear@1 118 // Seek back & reset buffer data
nuclear@1 119 if ((DataSize-Pos)>0)
nuclear@1 120 FilePos = pFile->LSeek(-(int)(DataSize-Pos), Seek_Cur);
nuclear@1 121 DataSize = 0;
nuclear@1 122 Pos = 0;
nuclear@1 123 break;
nuclear@1 124 default:
nuclear@1 125 // not handled!
nuclear@1 126 break;
nuclear@1 127 }
nuclear@1 128 }
nuclear@1 129
nuclear@1 130 // Reloads data for ReadBuffer
nuclear@1 131 void BufferedFile::LoadBuffer()
nuclear@1 132 {
nuclear@1 133 if (BufferMode == ReadBuffer)
nuclear@1 134 {
nuclear@1 135 // We should only reload once all of pre-loaded buffer is consumed.
nuclear@1 136 OVR_ASSERT(Pos == DataSize);
nuclear@1 137
nuclear@1 138 // WARNING: Right now LoadBuffer() assumes the buffer's empty
nuclear@1 139 int sz = pFile->Read(pBuffer,FILEBUFFER_SIZE);
nuclear@1 140 DataSize = sz<0 ? 0 : (unsigned)sz;
nuclear@1 141 Pos = 0;
nuclear@1 142 FilePos += DataSize;
nuclear@1 143 }
nuclear@1 144 }
nuclear@1 145
nuclear@1 146
nuclear@1 147 // ** Overridden functions
nuclear@1 148
nuclear@1 149 // We override all the functions that can possibly
nuclear@1 150 // require buffer mode switch, flush, or extra calculations
nuclear@1 151
nuclear@1 152 // Tell() requires buffer adjustment
nuclear@1 153 int BufferedFile::Tell()
nuclear@1 154 {
nuclear@1 155 if (BufferMode == ReadBuffer)
nuclear@1 156 return int (FilePos - DataSize + Pos);
nuclear@1 157
nuclear@1 158 int pos = pFile->Tell();
nuclear@1 159 // Adjust position based on buffer mode & data
nuclear@1 160 if (pos!=-1)
nuclear@1 161 {
nuclear@1 162 OVR_ASSERT(BufferMode != ReadBuffer);
nuclear@1 163 if (BufferMode == WriteBuffer)
nuclear@1 164 pos += Pos;
nuclear@1 165 }
nuclear@1 166 return pos;
nuclear@1 167 }
nuclear@1 168
nuclear@1 169 SInt64 BufferedFile::LTell()
nuclear@1 170 {
nuclear@1 171 if (BufferMode == ReadBuffer)
nuclear@1 172 return FilePos - DataSize + Pos;
nuclear@1 173
nuclear@1 174 SInt64 pos = pFile->LTell();
nuclear@1 175 if (pos!=-1)
nuclear@1 176 {
nuclear@1 177 OVR_ASSERT(BufferMode != ReadBuffer);
nuclear@1 178 if (BufferMode == WriteBuffer)
nuclear@1 179 pos += Pos;
nuclear@1 180 }
nuclear@1 181 return pos;
nuclear@1 182 }
nuclear@1 183
nuclear@1 184 int BufferedFile::GetLength()
nuclear@1 185 {
nuclear@1 186 int len = pFile->GetLength();
nuclear@1 187 // If writing through buffer, file length may actually be bigger
nuclear@1 188 if ((len!=-1) && (BufferMode==WriteBuffer))
nuclear@1 189 {
nuclear@1 190 int currPos = pFile->Tell() + Pos;
nuclear@1 191 if (currPos>len)
nuclear@1 192 len = currPos;
nuclear@1 193 }
nuclear@1 194 return len;
nuclear@1 195 }
nuclear@1 196 SInt64 BufferedFile::LGetLength()
nuclear@1 197 {
nuclear@1 198 SInt64 len = pFile->LGetLength();
nuclear@1 199 // If writing through buffer, file length may actually be bigger
nuclear@1 200 if ((len!=-1) && (BufferMode==WriteBuffer))
nuclear@1 201 {
nuclear@1 202 SInt64 currPos = pFile->LTell() + Pos;
nuclear@1 203 if (currPos>len)
nuclear@1 204 len = currPos;
nuclear@1 205 }
nuclear@1 206 return len;
nuclear@1 207 }
nuclear@1 208
nuclear@1 209 /*
nuclear@1 210 bool BufferedFile::Stat(FileStats *pfs)
nuclear@1 211 {
nuclear@1 212 // Have to fix up length is stat
nuclear@1 213 if (pFile->Stat(pfs))
nuclear@1 214 {
nuclear@1 215 if (BufferMode==WriteBuffer)
nuclear@1 216 {
nuclear@1 217 SInt64 currPos = pFile->LTell() + Pos;
nuclear@1 218 if (currPos > pfs->Size)
nuclear@1 219 {
nuclear@1 220 pfs->Size = currPos;
nuclear@1 221 // ??
nuclear@1 222 pfs->Blocks = (pfs->Size+511) >> 9;
nuclear@1 223 }
nuclear@1 224 }
nuclear@1 225 return 1;
nuclear@1 226 }
nuclear@1 227 return 0;
nuclear@1 228 }
nuclear@1 229 */
nuclear@1 230
nuclear@1 231 int BufferedFile::Write(const UByte *psourceBuffer, int numBytes)
nuclear@1 232 {
nuclear@1 233 if ( (BufferMode==WriteBuffer) || SetBufferMode(WriteBuffer))
nuclear@1 234 {
nuclear@1 235 // If not data space in buffer, flush
nuclear@1 236 if ((FILEBUFFER_SIZE-(int)Pos)<numBytes)
nuclear@1 237 {
nuclear@1 238 FlushBuffer();
nuclear@1 239 // If bigger then tolerance, just write directly
nuclear@1 240 if (numBytes>FILEBUFFER_TOLERANCE)
nuclear@1 241 {
nuclear@1 242 int sz = pFile->Write(psourceBuffer,numBytes);
nuclear@1 243 if (sz > 0)
nuclear@1 244 FilePos += sz;
nuclear@1 245 return sz;
nuclear@1 246 }
nuclear@1 247 }
nuclear@1 248
nuclear@1 249 // Enough space in buffer.. so copy to it
nuclear@1 250 memcpy(pBuffer+Pos, psourceBuffer, numBytes);
nuclear@1 251 Pos += numBytes;
nuclear@1 252 return numBytes;
nuclear@1 253 }
nuclear@1 254 int sz = pFile->Write(psourceBuffer,numBytes);
nuclear@1 255 if (sz > 0)
nuclear@1 256 FilePos += sz;
nuclear@1 257 return sz;
nuclear@1 258 }
nuclear@1 259
nuclear@1 260 int BufferedFile::Read(UByte *pdestBuffer, int numBytes)
nuclear@1 261 {
nuclear@1 262 if ( (BufferMode==ReadBuffer) || SetBufferMode(ReadBuffer))
nuclear@1 263 {
nuclear@1 264 // Data in buffer... copy it
nuclear@1 265 if ((int)(DataSize-Pos) >= numBytes)
nuclear@1 266 {
nuclear@1 267 memcpy(pdestBuffer, pBuffer+Pos, numBytes);
nuclear@1 268 Pos += numBytes;
nuclear@1 269 return numBytes;
nuclear@1 270 }
nuclear@1 271
nuclear@1 272 // Not enough data in buffer, copy buffer
nuclear@1 273 int readBytes = DataSize-Pos;
nuclear@1 274 memcpy(pdestBuffer, pBuffer+Pos, readBytes);
nuclear@1 275 numBytes -= readBytes;
nuclear@1 276 pdestBuffer += readBytes;
nuclear@1 277 Pos = DataSize;
nuclear@1 278
nuclear@1 279 // Don't reload buffer if more then tolerance
nuclear@1 280 // (No major advantage, and we don't want to write a loop)
nuclear@1 281 if (numBytes>FILEBUFFER_TOLERANCE)
nuclear@1 282 {
nuclear@1 283 numBytes = pFile->Read(pdestBuffer,numBytes);
nuclear@1 284 if (numBytes > 0)
nuclear@1 285 {
nuclear@1 286 FilePos += numBytes;
nuclear@1 287 Pos = DataSize = 0;
nuclear@1 288 }
nuclear@1 289 return readBytes + ((numBytes==-1) ? 0 : numBytes);
nuclear@1 290 }
nuclear@1 291
nuclear@1 292 // Reload the buffer
nuclear@1 293 // WARNING: Right now LoadBuffer() assumes the buffer's empty
nuclear@1 294 LoadBuffer();
nuclear@1 295 if ((int)(DataSize-Pos) < numBytes)
nuclear@1 296 numBytes = (int)DataSize-Pos;
nuclear@1 297
nuclear@1 298 memcpy(pdestBuffer, pBuffer+Pos, numBytes);
nuclear@1 299 Pos += numBytes;
nuclear@1 300 return numBytes + readBytes;
nuclear@1 301
nuclear@1 302 /*
nuclear@1 303 // Alternative Read implementation. The one above is probably better
nuclear@1 304 // due to FILEBUFFER_TOLERANCE.
nuclear@1 305 int total = 0;
nuclear@1 306
nuclear@1 307 do {
nuclear@1 308 int bufferBytes = (int)(DataSize-Pos);
nuclear@1 309 int copyBytes = (bufferBytes > numBytes) ? numBytes : bufferBytes;
nuclear@1 310
nuclear@1 311 memcpy(pdestBuffer, pBuffer+Pos, copyBytes);
nuclear@1 312 numBytes -= copyBytes;
nuclear@1 313 pdestBuffer += copyBytes;
nuclear@1 314 Pos += copyBytes;
nuclear@1 315 total += copyBytes;
nuclear@1 316
nuclear@1 317 if (numBytes == 0)
nuclear@1 318 break;
nuclear@1 319 LoadBuffer();
nuclear@1 320
nuclear@1 321 } while (DataSize > 0);
nuclear@1 322
nuclear@1 323 return total;
nuclear@1 324 */
nuclear@1 325 }
nuclear@1 326 int sz = pFile->Read(pdestBuffer,numBytes);
nuclear@1 327 if (sz > 0)
nuclear@1 328 FilePos += sz;
nuclear@1 329 return sz;
nuclear@1 330 }
nuclear@1 331
nuclear@1 332
nuclear@1 333 int BufferedFile::SkipBytes(int numBytes)
nuclear@1 334 {
nuclear@1 335 int skippedBytes = 0;
nuclear@1 336
nuclear@1 337 // Special case for skipping a little data in read buffer
nuclear@1 338 if (BufferMode==ReadBuffer)
nuclear@1 339 {
nuclear@1 340 skippedBytes = (((int)DataSize-(int)Pos) >= numBytes) ? numBytes : (DataSize-Pos);
nuclear@1 341 Pos += skippedBytes;
nuclear@1 342 numBytes -= skippedBytes;
nuclear@1 343 }
nuclear@1 344
nuclear@1 345 if (numBytes)
nuclear@1 346 {
nuclear@1 347 numBytes = pFile->SkipBytes(numBytes);
nuclear@1 348 // Make sure we return the actual number skipped, or error
nuclear@1 349 if (numBytes!=-1)
nuclear@1 350 {
nuclear@1 351 skippedBytes += numBytes;
nuclear@1 352 FilePos += numBytes;
nuclear@1 353 Pos = DataSize = 0;
nuclear@1 354 }
nuclear@1 355 else if (skippedBytes <= 0)
nuclear@1 356 skippedBytes = -1;
nuclear@1 357 }
nuclear@1 358 return skippedBytes;
nuclear@1 359 }
nuclear@1 360
nuclear@1 361 int BufferedFile::BytesAvailable()
nuclear@1 362 {
nuclear@1 363 int available = pFile->BytesAvailable();
nuclear@1 364 // Adjust available size based on buffers
nuclear@1 365 switch(BufferMode)
nuclear@1 366 {
nuclear@1 367 case ReadBuffer:
nuclear@1 368 available += DataSize-Pos;
nuclear@1 369 break;
nuclear@1 370 case WriteBuffer:
nuclear@1 371 available -= Pos;
nuclear@1 372 if (available<0)
nuclear@1 373 available= 0;
nuclear@1 374 break;
nuclear@1 375 default:
nuclear@1 376 break;
nuclear@1 377 }
nuclear@1 378 return available;
nuclear@1 379 }
nuclear@1 380
nuclear@1 381 bool BufferedFile::Flush()
nuclear@1 382 {
nuclear@1 383 FlushBuffer();
nuclear@1 384 return pFile->Flush();
nuclear@1 385 }
nuclear@1 386
nuclear@1 387 // Seeking could be optimized better..
nuclear@1 388 int BufferedFile::Seek(int offset, int origin)
nuclear@1 389 {
nuclear@1 390 if (BufferMode == ReadBuffer)
nuclear@1 391 {
nuclear@1 392 if (origin == Seek_Cur)
nuclear@1 393 {
nuclear@1 394 // Seek can fall either before or after Pos in the buffer,
nuclear@1 395 // but it must be within bounds.
nuclear@1 396 if (((unsigned(offset) + Pos)) <= DataSize)
nuclear@1 397 {
nuclear@1 398 Pos += offset;
nuclear@1 399 return int (FilePos - DataSize + Pos);
nuclear@1 400 }
nuclear@1 401
nuclear@1 402 // Lightweight buffer "Flush". We do this to avoid an extra seek
nuclear@1 403 // back operation which would take place if we called FlushBuffer directly.
nuclear@1 404 origin = Seek_Set;
nuclear@1 405 OVR_ASSERT(((FilePos - DataSize + Pos) + (UInt64)offset) < ~(UInt64)0);
nuclear@1 406 offset = (int)(FilePos - DataSize + Pos) + offset;
nuclear@1 407 Pos = DataSize = 0;
nuclear@1 408 }
nuclear@1 409 else if (origin == Seek_Set)
nuclear@1 410 {
nuclear@1 411 if (((unsigned)offset - (FilePos-DataSize)) <= DataSize)
nuclear@1 412 {
nuclear@1 413 OVR_ASSERT((FilePos-DataSize) < ~(UInt64)0);
nuclear@1 414 Pos = (unsigned)offset - (unsigned)(FilePos-DataSize);
nuclear@1 415 return offset;
nuclear@1 416 }
nuclear@1 417 Pos = DataSize = 0;
nuclear@1 418 }
nuclear@1 419 else
nuclear@1 420 {
nuclear@1 421 FlushBuffer();
nuclear@1 422 }
nuclear@1 423 }
nuclear@1 424 else
nuclear@1 425 {
nuclear@1 426 FlushBuffer();
nuclear@1 427 }
nuclear@1 428
nuclear@1 429 /*
nuclear@1 430 // Old Seek Logic
nuclear@1 431 if (origin == Seek_Cur && offset + Pos < DataSize)
nuclear@1 432 {
nuclear@1 433 //OVR_ASSERT((FilePos - DataSize) >= (FilePos - DataSize + Pos + offset));
nuclear@1 434 Pos += offset;
nuclear@1 435 OVR_ASSERT(int (Pos) >= 0);
nuclear@1 436 return int (FilePos - DataSize + Pos);
nuclear@1 437 }
nuclear@1 438 else if (origin == Seek_Set && unsigned(offset) >= FilePos - DataSize && unsigned(offset) < FilePos)
nuclear@1 439 {
nuclear@1 440 Pos = unsigned(offset - FilePos + DataSize);
nuclear@1 441 OVR_ASSERT(int (Pos) >= 0);
nuclear@1 442 return int (FilePos - DataSize + Pos);
nuclear@1 443 }
nuclear@1 444
nuclear@1 445 FlushBuffer();
nuclear@1 446 */
nuclear@1 447
nuclear@1 448
nuclear@1 449 FilePos = pFile->Seek(offset,origin);
nuclear@1 450 return int (FilePos);
nuclear@1 451 }
nuclear@1 452
nuclear@1 453 SInt64 BufferedFile::LSeek(SInt64 offset, int origin)
nuclear@1 454 {
nuclear@1 455 if (BufferMode == ReadBuffer)
nuclear@1 456 {
nuclear@1 457 if (origin == Seek_Cur)
nuclear@1 458 {
nuclear@1 459 // Seek can fall either before or after Pos in the buffer,
nuclear@1 460 // but it must be within bounds.
nuclear@1 461 if (((unsigned(offset) + Pos)) <= DataSize)
nuclear@1 462 {
nuclear@1 463 Pos += (unsigned)offset;
nuclear@1 464 return SInt64(FilePos - DataSize + Pos);
nuclear@1 465 }
nuclear@1 466
nuclear@1 467 // Lightweight buffer "Flush". We do this to avoid an extra seek
nuclear@1 468 // back operation which would take place if we called FlushBuffer directly.
nuclear@1 469 origin = Seek_Set;
nuclear@1 470 offset = (SInt64)(FilePos - DataSize + Pos) + offset;
nuclear@1 471 Pos = DataSize = 0;
nuclear@1 472 }
nuclear@1 473 else if (origin == Seek_Set)
nuclear@1 474 {
nuclear@1 475 if (((UInt64)offset - (FilePos-DataSize)) <= DataSize)
nuclear@1 476 {
nuclear@1 477 Pos = (unsigned)((UInt64)offset - (FilePos-DataSize));
nuclear@1 478 return offset;
nuclear@1 479 }
nuclear@1 480 Pos = DataSize = 0;
nuclear@1 481 }
nuclear@1 482 else
nuclear@1 483 {
nuclear@1 484 FlushBuffer();
nuclear@1 485 }
nuclear@1 486 }
nuclear@1 487 else
nuclear@1 488 {
nuclear@1 489 FlushBuffer();
nuclear@1 490 }
nuclear@1 491
nuclear@1 492 /*
nuclear@1 493 OVR_ASSERT(BufferMode != NoBuffer);
nuclear@1 494
nuclear@1 495 if (origin == Seek_Cur && offset + Pos < DataSize)
nuclear@1 496 {
nuclear@1 497 Pos += int (offset);
nuclear@1 498 return FilePos - DataSize + Pos;
nuclear@1 499 }
nuclear@1 500 else if (origin == Seek_Set && offset >= SInt64(FilePos - DataSize) && offset < SInt64(FilePos))
nuclear@1 501 {
nuclear@1 502 Pos = unsigned(offset - FilePos + DataSize);
nuclear@1 503 return FilePos - DataSize + Pos;
nuclear@1 504 }
nuclear@1 505
nuclear@1 506 FlushBuffer();
nuclear@1 507 */
nuclear@1 508
nuclear@1 509 FilePos = pFile->LSeek(offset,origin);
nuclear@1 510 return FilePos;
nuclear@1 511 }
nuclear@1 512
nuclear@1 513 int BufferedFile::CopyFromStream(File *pstream, int byteSize)
nuclear@1 514 {
nuclear@1 515 // We can't rely on overridden Write()
nuclear@1 516 // because delegation doesn't override virtual pointers
nuclear@1 517 // So, just re-implement
nuclear@1 518 UByte buff[0x4000];
nuclear@1 519 int count = 0;
nuclear@1 520 int szRequest, szRead, szWritten;
nuclear@1 521
nuclear@1 522 while(byteSize)
nuclear@1 523 {
nuclear@1 524 szRequest = (byteSize > int(sizeof(buff))) ? int(sizeof(buff)) : byteSize;
nuclear@1 525
nuclear@1 526 szRead = pstream->Read(buff,szRequest);
nuclear@1 527 szWritten = 0;
nuclear@1 528 if (szRead > 0)
nuclear@1 529 szWritten = Write(buff,szRead);
nuclear@1 530
nuclear@1 531 count +=szWritten;
nuclear@1 532 byteSize-=szWritten;
nuclear@1 533 if (szWritten < szRequest)
nuclear@1 534 break;
nuclear@1 535 }
nuclear@1 536 return count;
nuclear@1 537 }
nuclear@1 538
nuclear@1 539 // Closing files
nuclear@1 540 bool BufferedFile::Close()
nuclear@1 541 {
nuclear@1 542 switch(BufferMode)
nuclear@1 543 {
nuclear@1 544 case WriteBuffer:
nuclear@1 545 FlushBuffer();
nuclear@1 546 break;
nuclear@1 547 case ReadBuffer:
nuclear@1 548 // No need to seek back on close
nuclear@1 549 BufferMode = NoBuffer;
nuclear@1 550 break;
nuclear@1 551 default:
nuclear@1 552 break;
nuclear@1 553 }
nuclear@1 554 return pFile->Close();
nuclear@1 555 }
nuclear@1 556
nuclear@1 557
nuclear@1 558 // ***** Global path helpers
nuclear@1 559
nuclear@1 560 // Find trailing short filename in a path.
nuclear@1 561 const char* OVR_CDECL GetShortFilename(const char* purl)
nuclear@1 562 {
nuclear@1 563 UPInt len = OVR_strlen(purl);
nuclear@1 564 for (UPInt i=len; i>0; i--)
nuclear@1 565 if (purl[i]=='\\' || purl[i]=='/')
nuclear@1 566 return purl+i+1;
nuclear@1 567 return purl;
nuclear@1 568 }
nuclear@1 569
nuclear@1 570 } // OVR
nuclear@1 571