Add OculusSDK 0.3.2 Linux Source Code w/o Samples, docs or binaries (libs or tools)

1 files changed, 582 insertions, 0 deletions

diff --git a/LibOVR/Src/Kernel/OVR_File.cpp b/LibOVR/Src/Kernel/OVR_File.cpp
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+++ b/LibOVR/Src/Kernel/OVR_File.cpp
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+/**************************************************************************
+
+Filename    :   OVR_File.cpp
+Content     :   File wrapper class implementation (Win32)
+
+Created     :   April 5, 1999
+Authors     :   Michael Antonov
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License"); 
+you may not use the Oculus VR Rift SDK except in compliance with the License, 
+which is provided at the time of installation or download, or which 
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1 
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+**************************************************************************/
+
+#define  GFILE_CXX
+
+// Standard C library (Captain Obvious guarantees!)
+#include <stdio.h>
+
+#include "OVR_File.h"
+
+namespace OVR {
+
+// Buffered file adds buffering to an existing file
+// FILEBUFFER_SIZE defines the size of internal buffer, while
+// FILEBUFFER_TOLERANCE controls the amount of data we'll effectively try to buffer
+#define FILEBUFFER_SIZE         (8192-8)
+#define FILEBUFFER_TOLERANCE    4096
+
+// ** Constructor/Destructor
+
+// Hidden constructor
+// Not supposed to be used
+BufferedFile::BufferedFile() : DelegatedFile(0)
+{
+    pBuffer     = (UByte*)OVR_ALLOC(FILEBUFFER_SIZE);
+    BufferMode  = NoBuffer;
+    FilePos     = 0;
+    Pos         = 0;
+    DataSize    = 0;
+}
+
+// Takes another file as source
+BufferedFile::BufferedFile(File *pfile) : DelegatedFile(pfile)
+{
+    pBuffer     = (UByte*)OVR_ALLOC(FILEBUFFER_SIZE);
+    BufferMode  = NoBuffer;
+    FilePos     = pfile->LTell();
+    Pos         = 0;
+    DataSize    = 0;
+}
+
+
+// Destructor
+BufferedFile::~BufferedFile()
+{
+    // Flush in case there's data
+    if (pFile)
+        FlushBuffer();
+    // Get rid of buffer
+    if (pBuffer)
+        OVR_FREE(pBuffer);
+}
+
+/*
+bool    BufferedFile::VCopy(const Object &source)
+{
+    if (!DelegatedFile::VCopy(source))
+        return 0;
+
+    // Data members
+    BufferedFile *psource = (BufferedFile*)&source;
+
+    // Buffer & the mode it's in
+    pBuffer         = psource->pBuffer;
+    BufferMode      = psource->BufferMode;
+    Pos             = psource->Pos;
+    DataSize        = psource->DataSize;
+    return 1;
+}
+*/
+
+// Initializes buffering to a certain mode
+bool    BufferedFile::SetBufferMode(BufferModeType mode)
+{
+    if (!pBuffer)
+        return false;
+    if (mode == BufferMode)
+        return true;
+     
+    FlushBuffer();
+
+    // Can't set write mode if we can't write
+    if ((mode==WriteBuffer) && (!pFile || !pFile->IsWritable()) )
+        return 0;
+
+    // And SetMode
+    BufferMode = mode;
+    Pos        = 0;
+    DataSize   = 0;
+    return 1;
+}
+
+// Flushes buffer
+void    BufferedFile::FlushBuffer()
+{
+    switch(BufferMode)
+    {
+        case WriteBuffer:
+            // Write data in buffer
+            FilePos += pFile->Write(pBuffer,Pos);
+            Pos = 0;
+            break;
+
+        case ReadBuffer:
+            // Seek back & reset buffer data
+            if ((DataSize-Pos)>0)
+                FilePos = pFile->LSeek(-(int)(DataSize-Pos), Seek_Cur);
+            DataSize = 0;
+            Pos      = 0;
+            break;
+        default:
+            // not handled!
+            break;
+    }
+}
+
+// Reloads data for ReadBuffer
+void    BufferedFile::LoadBuffer()
+{
+    if (BufferMode == ReadBuffer)
+    {
+        // We should only reload once all of pre-loaded buffer is consumed.
+        OVR_ASSERT(Pos == DataSize);
+
+        // WARNING: Right now LoadBuffer() assumes the buffer's empty
+        int sz   = pFile->Read(pBuffer,FILEBUFFER_SIZE);
+        DataSize = sz<0 ? 0 : (unsigned)sz;
+        Pos      = 0;
+        FilePos  += DataSize;
+    }
+}
+
+
+// ** Overridden functions
+
+// We override all the functions that can possibly
+// require buffer mode switch, flush, or extra calculations
+
+// Tell() requires buffer adjustment
+int     BufferedFile::Tell()
+{
+    if (BufferMode == ReadBuffer)
+        return int (FilePos - DataSize + Pos);
+
+    int pos = pFile->Tell();
+    // Adjust position based on buffer mode & data
+    if (pos!=-1)
+    {
+        OVR_ASSERT(BufferMode != ReadBuffer);
+        if (BufferMode == WriteBuffer)
+            pos += Pos;
+    }
+    return pos;
+}
+
+SInt64  BufferedFile::LTell()
+{
+    if (BufferMode == ReadBuffer)
+        return FilePos - DataSize + Pos;
+
+    SInt64 pos = pFile->LTell();
+    if (pos!=-1)
+    {
+        OVR_ASSERT(BufferMode != ReadBuffer);
+        if (BufferMode == WriteBuffer)
+            pos += Pos;
+    }
+    return pos;
+}
+
+int     BufferedFile::GetLength()
+{
+    int len = pFile->GetLength();
+    // If writing through buffer, file length may actually be bigger
+    if ((len!=-1) && (BufferMode==WriteBuffer))
+    {
+        int currPos = pFile->Tell() + Pos;
+        if (currPos>len)
+            len = currPos;
+    }
+    return len;
+}
+SInt64  BufferedFile::LGetLength()
+{
+    SInt64 len = pFile->LGetLength();
+    // If writing through buffer, file length may actually be bigger
+    if ((len!=-1) && (BufferMode==WriteBuffer))
+    {
+        SInt64 currPos = pFile->LTell() + Pos;
+        if (currPos>len)
+            len = currPos;
+    }
+    return len;
+}
+
+/*
+bool    BufferedFile::Stat(FileStats *pfs)
+{
+    // Have to fix up length is stat
+    if (pFile->Stat(pfs))
+    {
+        if (BufferMode==WriteBuffer)
+        {
+            SInt64 currPos = pFile->LTell() + Pos;
+            if (currPos > pfs->Size)
+            {
+                pfs->Size   = currPos;
+                // ??
+                pfs->Blocks = (pfs->Size+511) >> 9;
+            }
+        }
+        return 1;
+    }
+    return 0;
+}
+*/
+
+int     BufferedFile::Write(const UByte *psourceBuffer, int numBytes)
+{
+    if ( (BufferMode==WriteBuffer) || SetBufferMode(WriteBuffer))
+    {
+        // If not data space in buffer, flush
+        if ((FILEBUFFER_SIZE-(int)Pos)<numBytes)
+        {
+            FlushBuffer();
+            // If bigger then tolerance, just write directly
+            if (numBytes>FILEBUFFER_TOLERANCE)
+            {
+                int sz = pFile->Write(psourceBuffer,numBytes);
+                if (sz > 0)
+                    FilePos += sz;
+                return sz;
+            }
+        }
+
+        // Enough space in buffer.. so copy to it
+        memcpy(pBuffer+Pos, psourceBuffer, numBytes);
+        Pos += numBytes;
+        return numBytes;
+    }
+    int sz = pFile->Write(psourceBuffer,numBytes);
+    if (sz > 0)
+        FilePos += sz;
+    return sz;
+}
+
+int     BufferedFile::Read(UByte *pdestBuffer, int numBytes)
+{
+    if ( (BufferMode==ReadBuffer) || SetBufferMode(ReadBuffer))
+    {
+        // Data in buffer... copy it
+        if ((int)(DataSize-Pos) >= numBytes)
+        {
+            memcpy(pdestBuffer, pBuffer+Pos, numBytes);
+            Pos += numBytes;
+            return numBytes;
+        }
+
+        // Not enough data in buffer, copy buffer
+        int     readBytes = DataSize-Pos;
+        memcpy(pdestBuffer, pBuffer+Pos, readBytes);
+        numBytes    -= readBytes;
+        pdestBuffer += readBytes;
+        Pos = DataSize;
+
+        // Don't reload buffer if more then tolerance
+        // (No major advantage, and we don't want to write a loop)
+        if (numBytes>FILEBUFFER_TOLERANCE)
+        {
+            numBytes = pFile->Read(pdestBuffer,numBytes);
+            if (numBytes > 0)
+            {
+                FilePos += numBytes;
+                Pos = DataSize = 0;
+            }
+            return readBytes + ((numBytes==-1) ? 0 : numBytes);
+        }
+
+        // Reload the buffer
+        // WARNING: Right now LoadBuffer() assumes the buffer's empty
+        LoadBuffer();
+        if ((int)(DataSize-Pos) < numBytes)
+            numBytes = (int)DataSize-Pos;
+
+        memcpy(pdestBuffer, pBuffer+Pos, numBytes);
+        Pos += numBytes;
+        return numBytes + readBytes;
+        
+        /*
+        // Alternative Read implementation. The one above is probably better
+        // due to FILEBUFFER_TOLERANCE.
+        int     total = 0;
+
+        do {
+            int     bufferBytes = (int)(DataSize-Pos);
+            int     copyBytes = (bufferBytes > numBytes) ? numBytes : bufferBytes;
+
+            memcpy(pdestBuffer, pBuffer+Pos, copyBytes);
+            numBytes    -= copyBytes;
+            pdestBuffer += copyBytes;
+            Pos         += copyBytes;
+            total       += copyBytes;
+
+            if (numBytes == 0)
+                break;
+            LoadBuffer();
+
+        } while (DataSize > 0);
+
+        return total;
+        */     
+    }
+    int sz = pFile->Read(pdestBuffer,numBytes);
+    if (sz > 0)
+        FilePos += sz;
+    return sz;
+}
+
+
+int     BufferedFile::SkipBytes(int numBytes)
+{
+    int skippedBytes = 0;
+
+    // Special case for skipping a little data in read buffer
+    if (BufferMode==ReadBuffer)
+    {
+        skippedBytes = (((int)DataSize-(int)Pos) >= numBytes) ? numBytes : (DataSize-Pos);
+        Pos          += skippedBytes;
+        numBytes     -= skippedBytes;
+    }
+
+    if (numBytes)
+    {
+        numBytes = pFile->SkipBytes(numBytes);
+        // Make sure we return the actual number skipped, or error
+        if (numBytes!=-1)
+        {
+            skippedBytes += numBytes;
+            FilePos += numBytes;
+            Pos = DataSize = 0;
+        }
+        else if (skippedBytes <= 0)
+            skippedBytes = -1;
+    }
+    return skippedBytes;
+}
+
+int     BufferedFile::BytesAvailable()
+{
+    int available = pFile->BytesAvailable();
+    // Adjust available size based on buffers
+    switch(BufferMode)
+    {
+        case ReadBuffer:
+            available += DataSize-Pos;
+            break;
+        case WriteBuffer:
+            available -= Pos;
+            if (available<0)
+                available= 0;
+            break;
+        default:
+            break;
+    }
+    return available;
+}
+
+bool    BufferedFile::Flush()
+{
+    FlushBuffer();
+    return pFile->Flush();
+}
+
+// Seeking could be optimized better..
+int     BufferedFile::Seek(int offset, int origin)
+{    
+    if (BufferMode == ReadBuffer)
+    {
+        if (origin == Seek_Cur)
+        {
+            // Seek can fall either before or after Pos in the buffer,
+            // but it must be within bounds.
+            if (((unsigned(offset) + Pos)) <= DataSize)
+            {
+                Pos += offset;
+                return int (FilePos - DataSize + Pos);
+            }
+
+            // Lightweight buffer "Flush". We do this to avoid an extra seek
+            // back operation which would take place if we called FlushBuffer directly.
+            origin = Seek_Set;
+            OVR_ASSERT(((FilePos - DataSize + Pos) + (UInt64)offset) < ~(UInt64)0);
+            offset = (int)(FilePos - DataSize + Pos) + offset;
+            Pos = DataSize = 0;
+        }
+        else if (origin == Seek_Set)
+        {
+            if (((unsigned)offset - (FilePos-DataSize)) <= DataSize)
+            {
+                OVR_ASSERT((FilePos-DataSize) < ~(UInt64)0);
+                Pos = (unsigned)offset - (unsigned)(FilePos-DataSize);
+                return offset;
+            }
+            Pos = DataSize = 0;
+        }
+        else
+        {
+            FlushBuffer();
+        }
+    }
+    else
+    {
+        FlushBuffer();
+    }    
+
+    /*
+    // Old Seek Logic
+    if (origin == Seek_Cur && offset + Pos < DataSize)
+    {
+        //OVR_ASSERT((FilePos - DataSize) >= (FilePos - DataSize + Pos + offset));
+        Pos += offset;
+        OVR_ASSERT(int (Pos) >= 0);
+        return int (FilePos - DataSize + Pos);
+    }
+    else if (origin == Seek_Set && unsigned(offset) >= FilePos - DataSize && unsigned(offset) < FilePos)
+    {
+        Pos = unsigned(offset - FilePos + DataSize);
+        OVR_ASSERT(int (Pos) >= 0);
+        return int (FilePos - DataSize + Pos);
+    }   
+    
+    FlushBuffer();
+    */
+
+
+    FilePos = pFile->Seek(offset,origin);
+    return int (FilePos);
+}
+
+SInt64  BufferedFile::LSeek(SInt64 offset, int origin)
+{
+    if (BufferMode == ReadBuffer)
+    {
+        if (origin == Seek_Cur)
+        {
+            // Seek can fall either before or after Pos in the buffer,
+            // but it must be within bounds.
+            if (((unsigned(offset) + Pos)) <= DataSize)
+            {
+                Pos += (unsigned)offset;
+                return SInt64(FilePos - DataSize + Pos);
+            }
+
+            // Lightweight buffer "Flush". We do this to avoid an extra seek
+            // back operation which would take place if we called FlushBuffer directly.
+            origin = Seek_Set;            
+            offset = (SInt64)(FilePos - DataSize + Pos) + offset;
+            Pos = DataSize = 0;
+        }
+        else if (origin == Seek_Set)
+        {
+            if (((UInt64)offset - (FilePos-DataSize)) <= DataSize)
+            {                
+                Pos = (unsigned)((UInt64)offset - (FilePos-DataSize));
+                return offset;
+            }
+            Pos = DataSize = 0;
+        }
+        else
+        {
+            FlushBuffer();
+        }
+    }
+    else
+    {
+        FlushBuffer();
+    }
+
+/*
+    OVR_ASSERT(BufferMode != NoBuffer);
+
+    if (origin == Seek_Cur && offset + Pos < DataSize)
+    {
+        Pos += int (offset);
+        return FilePos - DataSize + Pos;
+    }
+    else if (origin == Seek_Set && offset >= SInt64(FilePos - DataSize) && offset < SInt64(FilePos))
+    {
+        Pos = unsigned(offset - FilePos + DataSize);
+        return FilePos - DataSize + Pos;
+    }
+
+    FlushBuffer();
+    */
+
+    FilePos = pFile->LSeek(offset,origin);
+    return FilePos;
+}
+
+int     BufferedFile::CopyFromStream(File *pstream, int byteSize)
+{
+    // We can't rely on overridden Write()
+    // because delegation doesn't override virtual pointers
+    // So, just re-implement
+    UByte   buff[0x4000];
+    int     count = 0;
+    int     szRequest, szRead, szWritten;
+
+    while(byteSize)
+    {
+        szRequest = (byteSize > int(sizeof(buff))) ? int(sizeof(buff)) : byteSize;
+
+        szRead    = pstream->Read(buff,szRequest);
+        szWritten = 0;
+        if (szRead > 0)
+            szWritten = Write(buff,szRead);
+
+        count   +=szWritten;
+        byteSize-=szWritten;
+        if (szWritten < szRequest)
+            break;
+    }
+    return count;
+}
+
+// Closing files
+bool    BufferedFile::Close()
+{
+    switch(BufferMode)
+    {
+        case WriteBuffer:
+            FlushBuffer();
+            break;
+        case ReadBuffer:
+            // No need to seek back on close
+            BufferMode = NoBuffer;
+            break;
+        default:
+            break;
+    }
+    return pFile->Close();
+}
+
+
+// ***** Global path helpers
+
+// Find trailing short filename in a path.
+const char* OVR_CDECL GetShortFilename(const char* purl)
+{    
+    UPInt len = OVR_strlen(purl);
+    for (UPInt i=len; i>0; i--) 
+        if (purl[i]=='\\' || purl[i]=='/')
+            return purl+i+1;
+    return purl;
+}
+
+} // OVR
+