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Diffstat (limited to 'LibOVR/Src/Kernel/OVR_File.h')
| -rw-r--r-- | LibOVR/Src/Kernel/OVR_File.h | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/LibOVR/Src/Kernel/OVR_File.h b/LibOVR/Src/Kernel/OVR_File.h new file mode 100644 index 0000000..a8dc615 --- /dev/null +++ b/LibOVR/Src/Kernel/OVR_File.h @@ -0,0 +1,529 @@ +/************************************************************************************ + +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 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. + +************************************************************************************/ + +#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 |