340 lines
8.4 KiB
C
340 lines
8.4 KiB
C
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2019 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#ifndef PSFILEBUFFER_PXFILEBUF_H
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#define PSFILEBUFFER_PXFILEBUF_H
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#include "foundation/PxSimpleTypes.h"
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/** \addtogroup foundation
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@{
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*/
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#if !PX_DOXYGEN
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namespace physx
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{
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namespace general_PxIOStream2
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{
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#endif
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PX_PUSH_PACK_DEFAULT
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/**
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\brief Callback class for data serialization.
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The user needs to supply an PxFileBuf implementation to a number of methods to allow the SDK to read or write
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chunks of binary data. This allows flexibility for the source/destination of the data. For example the PxFileBuf
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could store data in a file, memory buffer or custom file format.
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\note It is the users responsibility to ensure that the data is written to the appropriate offset.
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*/
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class PxFileBuf
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{
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public:
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enum EndianMode
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{
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ENDIAN_NONE = 0, // do no conversion for endian mode
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ENDIAN_BIG = 1, // always read/write data as natively big endian (Power PC, etc.)
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ENDIAN_LITTLE = 2 // always read/write data as natively little endian (Intel, etc.) Default Behavior!
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};
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PxFileBuf(EndianMode mode=ENDIAN_LITTLE)
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{
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setEndianMode(mode);
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}
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virtual ~PxFileBuf(void)
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{
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}
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/**
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\brief Declares a constant to seek to the end of the stream.
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*
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* Does not support streams longer than 32 bits
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*/
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static const uint32_t STREAM_SEEK_END=0xFFFFFFFF;
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enum OpenMode
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{
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OPEN_FILE_NOT_FOUND,
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OPEN_READ_ONLY, // open file buffer stream for read only access
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OPEN_WRITE_ONLY, // open file buffer stream for write only access
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OPEN_READ_WRITE_NEW, // open a new file for both read/write access
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OPEN_READ_WRITE_EXISTING // open an existing file for both read/write access
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};
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virtual OpenMode getOpenMode(void) const = 0;
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bool isOpen(void) const
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{
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return getOpenMode()!=OPEN_FILE_NOT_FOUND;
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}
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enum SeekType
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{
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SEEKABLE_NO = 0,
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SEEKABLE_READ = 0x1,
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SEEKABLE_WRITE = 0x2,
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SEEKABLE_READWRITE = 0x3
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};
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virtual SeekType isSeekable(void) const = 0;
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void setEndianMode(EndianMode e)
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{
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mEndianMode = e;
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if ( (e==ENDIAN_BIG && !isBigEndian() ) ||
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(e==ENDIAN_LITTLE && isBigEndian() ) )
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{
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mEndianSwap = true;
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}
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else
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{
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mEndianSwap = false;
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}
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}
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EndianMode getEndianMode(void) const
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{
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return mEndianMode;
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}
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virtual uint32_t getFileLength(void) const = 0;
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/**
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\brief Seeks the stream to a particular location for reading
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*
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* If the location passed exceeds the length of the stream, then it will seek to the end.
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* Returns the location it ended up at (useful if you seek to the end) to get the file position
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*/
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virtual uint32_t seekRead(uint32_t loc) = 0;
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/**
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\brief Seeks the stream to a particular location for writing
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*
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* If the location passed exceeds the length of the stream, then it will seek to the end.
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* Returns the location it ended up at (useful if you seek to the end) to get the file position
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*/
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virtual uint32_t seekWrite(uint32_t loc) = 0;
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/**
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\brief Reads from the stream into a buffer.
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\param[out] mem The buffer to read the stream into.
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\param[in] len The number of bytes to stream into the buffer
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\return Returns the actual number of bytes read. If not equal to the length requested, then reached end of stream.
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*/
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virtual uint32_t read(void *mem,uint32_t len) = 0;
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/**
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\brief Reads from the stream into a buffer but does not advance the read location.
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\param[out] mem The buffer to read the stream into.
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\param[in] len The number of bytes to stream into the buffer
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\return Returns the actual number of bytes read. If not equal to the length requested, then reached end of stream.
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*/
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virtual uint32_t peek(void *mem,uint32_t len) = 0;
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/**
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\brief Writes a buffer of memory to the stream
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\param[in] mem The address of a buffer of memory to send to the stream.
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\param[in] len The number of bytes to send to the stream.
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\return Returns the actual number of bytes sent to the stream. If not equal to the length specific, then the stream is full or unable to write for some reason.
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*/
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virtual uint32_t write(const void *mem,uint32_t len) = 0;
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/**
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\brief Reports the current stream location read aqccess.
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\return Returns the current stream read location.
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*/
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virtual uint32_t tellRead(void) const = 0;
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/**
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\brief Reports the current stream location for write access.
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\return Returns the current stream write location.
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*/
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virtual uint32_t tellWrite(void) const = 0;
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/**
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\brief Causes any temporarily cached data to be flushed to the stream.
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*/
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virtual void flush(void) = 0;
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/**
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\brief Close the stream.
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*/
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virtual void close(void) {}
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void release(void)
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{
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delete this;
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}
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static PX_INLINE bool isBigEndian()
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{
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int32_t i = 1;
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return *(reinterpret_cast<char*>(&i))==0;
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}
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PX_INLINE void swap2Bytes(void* _data) const
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{
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char *data = static_cast<char *>(_data);
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char one_byte;
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one_byte = data[0]; data[0] = data[1]; data[1] = one_byte;
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}
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PX_INLINE void swap4Bytes(void* _data) const
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{
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char *data = static_cast<char *>(_data);
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char one_byte;
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one_byte = data[0]; data[0] = data[3]; data[3] = one_byte;
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one_byte = data[1]; data[1] = data[2]; data[2] = one_byte;
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}
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PX_INLINE void swap8Bytes(void *_data) const
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{
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char *data = static_cast<char *>(_data);
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char one_byte;
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one_byte = data[0]; data[0] = data[7]; data[7] = one_byte;
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one_byte = data[1]; data[1] = data[6]; data[6] = one_byte;
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one_byte = data[2]; data[2] = data[5]; data[5] = one_byte;
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one_byte = data[3]; data[3] = data[4]; data[4] = one_byte;
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}
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PX_INLINE void storeDword(uint32_t v)
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{
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if ( mEndianSwap )
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swap4Bytes(&v);
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write(&v,sizeof(v));
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}
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PX_INLINE void storeFloat(float v)
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{
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if ( mEndianSwap )
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swap4Bytes(&v);
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write(&v,sizeof(v));
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}
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PX_INLINE void storeDouble(double v)
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{
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if ( mEndianSwap )
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swap8Bytes(&v);
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write(&v,sizeof(v));
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}
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PX_INLINE void storeByte(uint8_t b)
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{
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write(&b,sizeof(b));
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}
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PX_INLINE void storeWord(uint16_t w)
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{
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if ( mEndianSwap )
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swap2Bytes(&w);
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write(&w,sizeof(w));
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}
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uint8_t readByte(void)
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{
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uint8_t v=0;
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read(&v,sizeof(v));
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return v;
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}
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uint16_t readWord(void)
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{
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uint16_t v=0;
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read(&v,sizeof(v));
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if ( mEndianSwap )
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swap2Bytes(&v);
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return v;
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}
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uint32_t readDword(void)
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{
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uint32_t v=0;
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read(&v,sizeof(v));
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if ( mEndianSwap )
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swap4Bytes(&v);
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return v;
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}
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float readFloat(void)
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{
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float v=0;
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read(&v,sizeof(v));
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if ( mEndianSwap )
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swap4Bytes(&v);
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return v;
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}
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double readDouble(void)
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{
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double v=0;
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read(&v,sizeof(v));
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if ( mEndianSwap )
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swap8Bytes(&v);
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return v;
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}
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private:
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bool mEndianSwap; // whether or not the endian should be swapped on the current platform
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EndianMode mEndianMode; // the current endian mode behavior for the stream
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};
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PX_POP_PACK
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#if !PX_DOXYGEN
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} // end of namespace
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using namespace general_PxIOStream2;
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namespace general_PxIOStream = general_PxIOStream2;
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} // end of namespace
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#endif
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/** @} */
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#endif // PSFILEBUFFER_PXFILEBUF_H
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