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overte/interface/external/LibOVR/Src/Kernel/OVR_File.h
Andrzej Kapolka 0e0685af04 New Oculus software with Linux support.
2013-11-25 17:30:51 -08:00

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/************************************************************************************
PublicHeader: Kernel
Filename : OVR_File.h
Content : Header for all internal file management - functions and structures
to be inherited by OS specific subclasses.
Created : September 19, 2012
Notes :
Notes : errno may not be preserved across use of BaseFile member functions
: Directories cannot be deleted while files opened from them are in use
(For the GetFullName function)
Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.
Use of this software is subject to the terms of the Oculus license
agreement provided at the time of installation or download, or which
otherwise accompanies this software in either electronic or hard copy form.
************************************************************************************/
#ifndef OVR_File_h
#define OVR_File_h
#include "OVR_RefCount.h"
#include "OVR_Std.h"
#include "OVR_Alg.h"
#include <stdio.h>
#include "OVR_String.h"
namespace OVR {
// ***** Declared classes
class FileConstants;
class File;
class DelegatedFile;
class BufferedFile;
// ***** Flags for File & Directory accesses
class FileConstants
{
public:
// *** File open flags
enum OpenFlags
{
Open_Read = 1,
Open_Write = 2,
Open_ReadWrite = 3,
// Opens file and truncates it to zero length
// - file must have write permission
// - when used with Create, it opens an existing
// file and empties it or creates a new file
Open_Truncate = 4,
// Creates and opens new file
// - does not erase contents if file already
// exists unless combined with Truncate
Open_Create = 8,
// Returns an error value if the file already exists
Open_CreateOnly = 24,
// Open file with buffering
Open_Buffered = 32
};
// *** File Mode flags
enum Modes
{
Mode_Read = 0444,
Mode_Write = 0222,
Mode_Execute = 0111,
Mode_ReadWrite = 0666
};
// *** Seek operations
enum SeekOps
{
Seek_Set = 0,
Seek_Cur = 1,
Seek_End = 2
};
// *** Errors
enum Errors
{
Error_FileNotFound = 0x1001,
Error_Access = 0x1002,
Error_IOError = 0x1003,
Error_DiskFull = 0x1004
};
};
//-----------------------------------------------------------------------------------
// ***** File Class
// The pure virtual base random-access file
// This is a base class to all files
class File : public RefCountBase<File>, public FileConstants
{
public:
File() { }
// ** Location Information
// Returns a file name path relative to the 'reference' directory
// This is often a path that was used to create a file
// (this is not a global path, global path can be obtained with help of directory)
virtual const char* GetFilePath() = 0;
// ** File Information
// Return 1 if file's usable (open)
virtual bool IsValid() = 0;
// Return 1 if file's writable, otherwise 0
virtual bool IsWritable() = 0;
// Return position
virtual int Tell() = 0;
virtual SInt64 LTell() = 0;
// File size
virtual int GetLength() = 0;
virtual SInt64 LGetLength() = 0;
// Returns file stats
// 0 for failure
//virtual bool Stat(FileStats *pfs) = 0;
// Return errno-based error code
// Useful if any other function failed
virtual int GetErrorCode() = 0;
// ** Stream implementation & I/O
// Blocking write, will write in the given number of bytes to the stream
// Returns : -1 for error
// Otherwise number of bytes read
virtual int Write(const UByte *pbufer, int numBytes) = 0;
// Blocking read, will read in the given number of bytes or less from the stream
// Returns : -1 for error
// Otherwise number of bytes read,
// if 0 or < numBytes, no more bytes available; end of file or the other side of stream is closed
virtual int Read(UByte *pbufer, int numBytes) = 0;
// Skips (ignores) a given # of bytes
// Same return values as Read
virtual int SkipBytes(int numBytes) = 0;
// Returns the number of bytes available to read from a stream without blocking
// For a file, this should generally be number of bytes to the end
virtual int BytesAvailable() = 0;
// Causes any implementation's buffered data to be delivered to destination
// Return 0 for error
virtual bool Flush() = 0;
// Need to provide a more optimized implementation that doe snot necessarily involve a lot of seeking
inline bool IsEOF() { return !BytesAvailable(); }
// Seeking
// Returns new position, -1 for error
virtual int Seek(int offset, int origin=Seek_Set) = 0;
virtual SInt64 LSeek(SInt64 offset, int origin=Seek_Set) = 0;
// Seek simplification
int SeekToBegin() {return Seek(0); }
int SeekToEnd() {return Seek(0,Seek_End); }
int Skip(int numBytes) {return Seek(numBytes,Seek_Cur); }
// Appends other file data from a stream
// Return -1 for error, else # of bytes written
virtual int CopyFromStream(File *pstream, int byteSize) = 0;
// Closes the file
// After close, file cannot be accessed
virtual bool Close() = 0;
// ***** Inlines for convenient primitive type serialization
// Read/Write helpers
private:
UInt64 PRead64() { UInt64 v = 0; Read((UByte*)&v, 8); return v; }
UInt32 PRead32() { UInt32 v = 0; Read((UByte*)&v, 4); return v; }
UInt16 PRead16() { UInt16 v = 0; Read((UByte*)&v, 2); return v; }
UByte PRead8() { UByte v = 0; Read((UByte*)&v, 1); return v; }
void PWrite64(UInt64 v) { Write((UByte*)&v, 8); }
void PWrite32(UInt32 v) { Write((UByte*)&v, 4); }
void PWrite16(UInt16 v) { Write((UByte*)&v, 2); }
void PWrite8(UByte v) { Write((UByte*)&v, 1); }
public:
// Writing primitive types - Little Endian
inline void WriteUByte(UByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteSByte(SByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteUInt8(UByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteSInt8(SByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteUInt16(UInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteSInt16(SInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteUInt32(UInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteSInt32(SInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteUInt64(UInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteSInt64(SInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToLE(v)); }
inline void WriteFloat(float v) { v = Alg::ByteUtil::SystemToLE(v); Write((UByte*)&v, 4); }
inline void WriteDouble(double v) { v = Alg::ByteUtil::SystemToLE(v); Write((UByte*)&v, 8); }
// Writing primitive types - Big Endian
inline void WriteUByteBE(UByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteSByteBE(SByte v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteUInt8BE(UInt16 v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteSInt8BE(SInt16 v) { PWrite8((UByte)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteUInt16BE(UInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteSInt16BE(UInt16 v) { PWrite16((UInt16)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteUInt32BE(UInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteSInt32BE(UInt32 v) { PWrite32((UInt32)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteUInt64BE(UInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteSInt64BE(UInt64 v) { PWrite64((UInt64)Alg::ByteUtil::SystemToBE(v)); }
inline void WriteFloatBE(float v) { v = Alg::ByteUtil::SystemToBE(v); Write((UByte*)&v, 4); }
inline void WriteDoubleBE(double v) { v = Alg::ByteUtil::SystemToBE(v); Write((UByte*)&v, 8); }
// Reading primitive types - Little Endian
inline UByte ReadUByte() { return (UByte)Alg::ByteUtil::LEToSystem(PRead8()); }
inline SByte ReadSByte() { return (SByte)Alg::ByteUtil::LEToSystem(PRead8()); }
inline UByte ReadUInt8() { return (UByte)Alg::ByteUtil::LEToSystem(PRead8()); }
inline SByte ReadSInt8() { return (SByte)Alg::ByteUtil::LEToSystem(PRead8()); }
inline UInt16 ReadUInt16() { return (UInt16)Alg::ByteUtil::LEToSystem(PRead16()); }
inline SInt16 ReadSInt16() { return (SInt16)Alg::ByteUtil::LEToSystem(PRead16()); }
inline UInt32 ReadUInt32() { return (UInt32)Alg::ByteUtil::LEToSystem(PRead32()); }
inline SInt32 ReadSInt32() { return (SInt32)Alg::ByteUtil::LEToSystem(PRead32()); }
inline UInt64 ReadUInt64() { return (UInt64)Alg::ByteUtil::LEToSystem(PRead64()); }
inline SInt64 ReadSInt64() { return (SInt64)Alg::ByteUtil::LEToSystem(PRead64()); }
inline float ReadFloat() { float v = 0.0f; Read((UByte*)&v, 4); return Alg::ByteUtil::LEToSystem(v); }
inline double ReadDouble() { double v = 0.0; Read((UByte*)&v, 8); return Alg::ByteUtil::LEToSystem(v); }
// Reading primitive types - Big Endian
inline UByte ReadUByteBE() { return (UByte)Alg::ByteUtil::BEToSystem(PRead8()); }
inline SByte ReadSByteBE() { return (SByte)Alg::ByteUtil::BEToSystem(PRead8()); }
inline UByte ReadUInt8BE() { return (UByte)Alg::ByteUtil::BEToSystem(PRead8()); }
inline SByte ReadSInt8BE() { return (SByte)Alg::ByteUtil::BEToSystem(PRead8()); }
inline UInt16 ReadUInt16BE() { return (UInt16)Alg::ByteUtil::BEToSystem(PRead16()); }
inline SInt16 ReadSInt16BE() { return (SInt16)Alg::ByteUtil::BEToSystem(PRead16()); }
inline UInt32 ReadUInt32BE() { return (UInt32)Alg::ByteUtil::BEToSystem(PRead32()); }
inline SInt32 ReadSInt32BE() { return (SInt32)Alg::ByteUtil::BEToSystem(PRead32()); }
inline UInt64 ReadUInt64BE() { return (UInt64)Alg::ByteUtil::BEToSystem(PRead64()); }
inline SInt64 ReadSInt64BE() { return (SInt64)Alg::ByteUtil::BEToSystem(PRead64()); }
inline float ReadFloatBE() { float v = 0.0f; Read((UByte*)&v, 4); return Alg::ByteUtil::BEToSystem(v); }
inline double ReadDoubleBE() { double v = 0.0; Read((UByte*)&v, 8); return Alg::ByteUtil::BEToSystem(v); }
};
// *** Delegated File
class DelegatedFile : public File
{
protected:
// Delegating file pointer
Ptr<File> pFile;
// Hidden default constructor
DelegatedFile() : pFile(0) { }
DelegatedFile(const DelegatedFile &source) : File() { OVR_UNUSED(source); }
public:
// Constructors
DelegatedFile(File *pfile) : pFile(pfile) { }
// ** Location Information
virtual const char* GetFilePath() { return pFile->GetFilePath(); }
// ** File Information
virtual bool IsValid() { return pFile && pFile->IsValid(); }
virtual bool IsWritable() { return pFile->IsWritable(); }
// virtual bool IsRecoverable() { return pFile->IsRecoverable(); }
virtual int Tell() { return pFile->Tell(); }
virtual SInt64 LTell() { return pFile->LTell(); }
virtual int GetLength() { return pFile->GetLength(); }
virtual SInt64 LGetLength() { return pFile->LGetLength(); }
//virtual bool Stat(FileStats *pfs) { return pFile->Stat(pfs); }
virtual int GetErrorCode() { return pFile->GetErrorCode(); }
// ** Stream implementation & I/O
virtual int Write(const UByte *pbuffer, int numBytes) { return pFile->Write(pbuffer,numBytes); }
virtual int Read(UByte *pbuffer, int numBytes) { return pFile->Read(pbuffer,numBytes); }
virtual int SkipBytes(int numBytes) { return pFile->SkipBytes(numBytes); }
virtual int BytesAvailable() { return pFile->BytesAvailable(); }
virtual bool Flush() { return pFile->Flush(); }
// Seeking
virtual int Seek(int offset, int origin=Seek_Set) { return pFile->Seek(offset,origin); }
virtual SInt64 LSeek(SInt64 offset, int origin=Seek_Set) { return pFile->LSeek(offset,origin); }
virtual int CopyFromStream(File *pstream, int byteSize) { return pFile->CopyFromStream(pstream,byteSize); }
// Closing the file
virtual bool Close() { return pFile->Close(); }
};
//-----------------------------------------------------------------------------------
// ***** Buffered File
// This file class adds buffering to an existing file
// Buffered file never fails by itself; if there's not
// enough memory for buffer, no buffer's used
class BufferedFile : public DelegatedFile
{
protected:
enum BufferModeType
{
NoBuffer,
ReadBuffer,
WriteBuffer
};
// Buffer & the mode it's in
UByte* pBuffer;
BufferModeType BufferMode;
// Position in buffer
unsigned Pos;
// Data in buffer if reading
unsigned DataSize;
// Underlying file position
UInt64 FilePos;
// Initializes buffering to a certain mode
bool SetBufferMode(BufferModeType mode);
// Flushes buffer
// WriteBuffer - write data to disk, ReadBuffer - reset buffer & fix file position
void FlushBuffer();
// Loads data into ReadBuffer
// WARNING: Right now LoadBuffer() assumes the buffer's empty
void LoadBuffer();
// Hidden constructor
BufferedFile();
inline BufferedFile(const BufferedFile &source) : DelegatedFile() { OVR_UNUSED(source); }
public:
// Constructor
// - takes another file as source
BufferedFile(File *pfile);
~BufferedFile();
// ** Overridden functions
// We override all the functions that can possibly
// require buffer mode switch, flush, or extra calculations
virtual int Tell();
virtual SInt64 LTell();
virtual int GetLength();
virtual SInt64 LGetLength();
// virtual bool Stat(GFileStats *pfs);
virtual int Write(const UByte *pbufer, int numBytes);
virtual int Read(UByte *pbufer, int numBytes);
virtual int SkipBytes(int numBytes);
virtual int BytesAvailable();
virtual bool Flush();
virtual int Seek(int offset, int origin=Seek_Set);
virtual SInt64 LSeek(SInt64 offset, int origin=Seek_Set);
virtual int CopyFromStream(File *pstream, int byteSize);
virtual bool Close();
};
//-----------------------------------------------------------------------------------
// ***** Memory File
class MemoryFile : public File
{
public:
const char* GetFilePath() { return FilePath.ToCStr(); }
bool IsValid() { return Valid; }
bool IsWritable() { return false; }
bool Flush() { return true; }
int GetErrorCode() { return 0; }
int Tell() { return FileIndex; }
SInt64 LTell() { return (SInt64) FileIndex; }
int GetLength() { return FileSize; }
SInt64 LGetLength() { return (SInt64) FileSize; }
bool Close()
{
Valid = false;
return false;
}
int CopyFromStream(File *pstream, int byteSize)
{ OVR_UNUSED2(pstream, byteSize);
return 0;
}
int Write(const UByte *pbuffer, int numBytes)
{ OVR_UNUSED2(pbuffer, numBytes);
return 0;
}
int Read(UByte *pbufer, int numBytes)
{
if (FileIndex + numBytes > FileSize)
{
numBytes = FileSize - FileIndex;
}
if (numBytes > 0)
{
::memcpy (pbufer, &FileData [FileIndex], numBytes);
FileIndex += numBytes;
}
return numBytes;
}
int SkipBytes(int numBytes)
{
if (FileIndex + numBytes > FileSize)
{
numBytes = FileSize - FileIndex;
}
FileIndex += numBytes;
return numBytes;
}
int BytesAvailable()
{
return (FileSize - FileIndex);
}
int Seek(int offset, int origin = Seek_Set)
{
switch (origin)
{
case Seek_Set : FileIndex = offset; break;
case Seek_Cur : FileIndex += offset; break;
case Seek_End : FileIndex = FileSize - offset; break;
}
return FileIndex;
}
SInt64 LSeek(SInt64 offset, int origin = Seek_Set)
{
return (SInt64) Seek((int) offset, origin);
}
public:
MemoryFile (const String& fileName, const UByte *pBuffer, int buffSize)
: FilePath(fileName)
{
FileData = pBuffer;
FileSize = buffSize;
FileIndex = 0;
Valid = (!fileName.IsEmpty() && pBuffer && buffSize > 0) ? true : false;
}
// pfileName should be encoded as UTF-8 to support international file names.
MemoryFile (const char* pfileName, const UByte *pBuffer, int buffSize)
: FilePath(pfileName)
{
FileData = pBuffer;
FileSize = buffSize;
FileIndex = 0;
Valid = (pfileName && pBuffer && buffSize > 0) ? true : false;
}
private:
String FilePath;
const UByte *FileData;
int FileSize;
int FileIndex;
bool Valid;
};
// ***** Global path helpers
// Find trailing short filename in a path.
const char* OVR_CDECL GetShortFilename(const char* purl);
} // OVR
#endif
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