assimp/code/StreamReader.h

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/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------
Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.
Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the following
conditions are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other
materials provided with the distribution.
* Neither the name of the ASSIMP team, nor the names of its
contributors may be used to endorse or promote products
derived from this software without specific prior
written permission of the ASSIMP Development Team.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/
/** @file Defines the StreamReader class which reads data from
* a binary stream with a well-defined endianess. */
#ifndef AI_STREAMREADER_H_INCLUDED
#define AI_STREAMREADER_H_INCLUDED
#include "ByteSwap.h"
namespace Assimp {
// --------------------------------------------------------------------------------------------
/** Wrapper class around IOStream to allow for consistent reading of binary data in both
* little and big endian format. Don't attempt to instance the template directly. Use
* StreamReaderLE to read from a little-endian stream and StreamReaderBE to read from a
* BE stream. The class expects that the endianess of any input data is known at
* compile-time, which should usually be true (#BaseImporter::ConvertToUTF8 implements
* runtime endianess conversions for text files).
*
* XXX switch from unsigned int for size types to size_t? or ptrdiff_t?*/
// --------------------------------------------------------------------------------------------
template <bool SwapEndianess = false>
class StreamReader
{
public:
// ---------------------------------------------------------------------
/** Construction from a given stream with a well-defined endianess
*
* The stream will be deleted afterwards.
* @param stream Input stream
*/
General - Added format auto-detection to most loaders - Simplified BaseImporter::CanRead() with some utility methods - improved fast_atof -> no overruns anymore. Fuck you, irrlicht. - added assimp_cmd tool to allow command line model processing. Mainly adebugging tool for internal purposes, but others might find it useful, too. - vc8/vc9: revision number is now written to DLL version header - mkutil: some batch scripts to simplify tagging & building of release versions - some API cleanup - fixing some doxygen markup (+now explicit use of @file <filename>) - Icon for assimp_view and assimp_cmd 3DS - Normal vectors are not anymore inverted in some cases - Improved pivot handling - Improved handling of x-flipped meshes Collada - fixed a minor bug (visual_scene element) LWS - WIP implementation. No animations yet, some bugs and crashes. - Animation system remains disabled, WIP code - many test files for LWS, but most of them test the anim support, which is, read above, currently disabled. STL - fixing a log warning which appears for every model - added binary&ascii test spider, exported from truespace MD3 - Cleaning up output tags for automatically joined player models. IRR - Fixing coordinate system issues. - Instance handling improved. - Some of the reported crashes not yet fixed. PretransformVertices - Numerous performance improvements. - Added config option to preserve the hierarchy during the step. RemoveRedundantMaterials - Added config option to specify a list of materials which are kept in every case. UNREAL - Added support for the old unreal data format (*.a,*.d,*.uc) - tested only with exports from Milkshape - more Unreal stuff to come soon git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@356 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
2009-03-05 22:32:13 +00:00
StreamReader(IOStream* _stream)
{
if (!_stream) {
General - Added format auto-detection to most loaders - Simplified BaseImporter::CanRead() with some utility methods - improved fast_atof -> no overruns anymore. Fuck you, irrlicht. - added assimp_cmd tool to allow command line model processing. Mainly adebugging tool for internal purposes, but others might find it useful, too. - vc8/vc9: revision number is now written to DLL version header - mkutil: some batch scripts to simplify tagging & building of release versions - some API cleanup - fixing some doxygen markup (+now explicit use of @file <filename>) - Icon for assimp_view and assimp_cmd 3DS - Normal vectors are not anymore inverted in some cases - Improved pivot handling - Improved handling of x-flipped meshes Collada - fixed a minor bug (visual_scene element) LWS - WIP implementation. No animations yet, some bugs and crashes. - Animation system remains disabled, WIP code - many test files for LWS, but most of them test the anim support, which is, read above, currently disabled. STL - fixing a log warning which appears for every model - added binary&ascii test spider, exported from truespace MD3 - Cleaning up output tags for automatically joined player models. IRR - Fixing coordinate system issues. - Instance handling improved. - Some of the reported crashes not yet fixed. PretransformVertices - Numerous performance improvements. - Added config option to preserve the hierarchy during the step. RemoveRedundantMaterials - Added config option to specify a list of materials which are kept in every case. UNREAL - Added support for the old unreal data format (*.a,*.d,*.uc) - tested only with exports from Milkshape - more Unreal stuff to come soon git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@356 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
2009-03-05 22:32:13 +00:00
throw new ImportErrorException("StreamReader: Unable to open file");
}
General - Added format auto-detection to most loaders - Simplified BaseImporter::CanRead() with some utility methods - improved fast_atof -> no overruns anymore. Fuck you, irrlicht. - added assimp_cmd tool to allow command line model processing. Mainly adebugging tool for internal purposes, but others might find it useful, too. - vc8/vc9: revision number is now written to DLL version header - mkutil: some batch scripts to simplify tagging & building of release versions - some API cleanup - fixing some doxygen markup (+now explicit use of @file <filename>) - Icon for assimp_view and assimp_cmd 3DS - Normal vectors are not anymore inverted in some cases - Improved pivot handling - Improved handling of x-flipped meshes Collada - fixed a minor bug (visual_scene element) LWS - WIP implementation. No animations yet, some bugs and crashes. - Animation system remains disabled, WIP code - many test files for LWS, but most of them test the anim support, which is, read above, currently disabled. STL - fixing a log warning which appears for every model - added binary&ascii test spider, exported from truespace MD3 - Cleaning up output tags for automatically joined player models. IRR - Fixing coordinate system issues. - Instance handling improved. - Some of the reported crashes not yet fixed. PretransformVertices - Numerous performance improvements. - Added config option to preserve the hierarchy during the step. RemoveRedundantMaterials - Added config option to specify a list of materials which are kept in every case. UNREAL - Added support for the old unreal data format (*.a,*.d,*.uc) - tested only with exports from Milkshape - more Unreal stuff to come soon git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@356 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
2009-03-05 22:32:13 +00:00
stream = _stream;
const size_t s = stream->FileSize();
if (!s) {
General - Added format auto-detection to most loaders - Simplified BaseImporter::CanRead() with some utility methods - improved fast_atof -> no overruns anymore. Fuck you, irrlicht. - added assimp_cmd tool to allow command line model processing. Mainly adebugging tool for internal purposes, but others might find it useful, too. - vc8/vc9: revision number is now written to DLL version header - mkutil: some batch scripts to simplify tagging & building of release versions - some API cleanup - fixing some doxygen markup (+now explicit use of @file <filename>) - Icon for assimp_view and assimp_cmd 3DS - Normal vectors are not anymore inverted in some cases - Improved pivot handling - Improved handling of x-flipped meshes Collada - fixed a minor bug (visual_scene element) LWS - WIP implementation. No animations yet, some bugs and crashes. - Animation system remains disabled, WIP code - many test files for LWS, but most of them test the anim support, which is, read above, currently disabled. STL - fixing a log warning which appears for every model - added binary&ascii test spider, exported from truespace MD3 - Cleaning up output tags for automatically joined player models. IRR - Fixing coordinate system issues. - Instance handling improved. - Some of the reported crashes not yet fixed. PretransformVertices - Numerous performance improvements. - Added config option to preserve the hierarchy during the step. RemoveRedundantMaterials - Added config option to specify a list of materials which are kept in every case. UNREAL - Added support for the old unreal data format (*.a,*.d,*.uc) - tested only with exports from Milkshape - more Unreal stuff to come soon git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@356 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
2009-03-05 22:32:13 +00:00
throw new ImportErrorException("StreamReader: File is empty");
}
current = buffer = new int8_t[s];
stream->Read(current,s,1);
end = limit = &buffer[s];
}
~StreamReader()
{
delete[] buffer;
delete stream;
}
public:
// deprecated, use overloaded operator>> instead
// ---------------------------------------------------------------------
/** Read a float from the stream */
float GetF4()
{
return Get<float>();
}
// ---------------------------------------------------------------------
/** Read a double from the stream */
double GetF8() {
return Get<double>();
}
// ---------------------------------------------------------------------
/** Read a signed 16 bit integer from the stream */
int16_t GetI2() {
return Get<int16_t>();
}
// ---------------------------------------------------------------------
/** Read a signed 8 bit integer from the stream */
int8_t GetI1() {
return Get<int8_t>();
}
// ---------------------------------------------------------------------
/** Read an signed 32 bit integer from the stream */
int32_t GetI4() {
return Get<int32_t>();
}
// ---------------------------------------------------------------------
/** Read a signed 64 bit integer from the stream */
int64_t GetI8() {
return Get<int64_t>();
}
// ---------------------------------------------------------------------
/** Read a unsigned 16 bit integer from the stream */
uint16_t GetU2() {
return Get<uint16_t>();
}
// ---------------------------------------------------------------------
/** Read a unsigned 8 bit integer from the stream */
uint8_t GetU1() {
return Get<uint8_t>();
}
// ---------------------------------------------------------------------
/** Read an unsigned 32 bit integer from the stream */
uint32_t GetU4() {
return Get<uint32_t>();
}
// ---------------------------------------------------------------------
/** Read a unsigned 64 bit integer from the stream */
uint64_t GetU8() {
return Get<uint64_t>();
}
public:
// ---------------------------------------------------------------------
/** Get the remaining stream size (to the end of the srream) */
unsigned int GetRemainingSize() const {
return (unsigned int)(end - current);
}
// ---------------------------------------------------------------------
/** Get the remaining stream size (to the current read limit). The
* return value is the remaining size of the stream if no custom
* read limit has been set. */
unsigned int GetRemainingSizeToLimit() const {
return (unsigned int)(limit - current);
}
// ---------------------------------------------------------------------
/** Increase the file pointer (relative seeking) */
void IncPtr(unsigned int plus) {
current += plus;
if (current > end) {
throw new ImportErrorException("End of file was reached");
}
}
// ---------------------------------------------------------------------
/** Get the current file pointer */
int8_t* GetPtr() const {
return current;
}
// ---------------------------------------------------------------------
/** Set current file pointer (Get it from #GetPtr). This is if you
* prefer to do pointer arithmetics on your own or want to copy
* large chunks of data at once.
* @param p The new pointer, which is validated against the size
* limit and buffer boundaries. */
void SetPtr(int8_t* p) {
current = p;
if (current > end || current < buffer) {
throw new ImportErrorException("End of file was reached");
}
}
// ---------------------------------------------------------------------
/** Copy n bytes to an external buffer
* @param out Destination for copying
* @param bytes Number of bytes to copy */
void CopyAndAdvance(void* out, size_t bytes) {
int8_t* ur = GetPtr();
SetPtr(ur+bytes); // fire exception if eof
memcpy(out,ur,bytes);
}
// ---------------------------------------------------------------------
/** Get the current offset from the beginning of the file */
int GetCurrentPos() const {
return (unsigned int)(current - buffer);
}
// ---------------------------------------------------------------------
/** Setup a temporary read limit
*
* @param limit Maximum number of bytes to be read from
* the beginning of the file. Passing 0xffffffff
* resets the limit to the original end of the stream. */
void SetReadLimit(unsigned int _limit) {
if (0xffffffff == _limit) {
limit = end;
return;
}
limit = buffer + _limit;
if (limit > end) {
throw new ImportErrorException("StreamReader: Invalid read limit");
}
}
// ---------------------------------------------------------------------
/** Get the current read limit in bytes. Reading over this limit
* accidentially raises an exception. */
int GetReadLimit() const {
return (unsigned int)(limit - buffer);
}
// ---------------------------------------------------------------------
/** Skip to the read limit in bytes. Reading over this limit
* accidentially raises an exception. */
void SkipToReadLimit() {
current = limit;
}
// ---------------------------------------------------------------------
/** overload operator>> and allow chaining of >> ops. */
template <typename T>
StreamReader& operator >> (T& f) {
f = Get<T>();
return *this;
}
private:
template <typename T, bool doit>
struct ByteSwapper {
void operator() (T* inout) {
ByteSwap::Swap(inout);
}
};
template <typename T>
struct ByteSwapper<T,false> {
void operator() (T*) {
}
};
// ---------------------------------------------------------------------
/** Generic read method. ByteSwap::Swap(T*) *must* be defined */
template <typename T>
T Get() {
if (current + sizeof(T) > limit) {
throw new ImportErrorException("End of file or stream limit was reached");
}
T f = *((const T*)current);
ByteSwapper<T,(SwapEndianess && sizeof(T)>1)> swapper;
swapper(&f);
current += sizeof(T);
return f;
}
IOStream* stream;
int8_t *buffer, *current, *end, *limit;
};
// --------------------------------------------------------------------------------------------
#ifdef AI_BUILD_BIG_ENDIAN
typedef StreamReader<true> StreamReaderLE;
typedef StreamReader<false> StreamReaderBE;
#else
typedef StreamReader<true> StreamReaderBE;
typedef StreamReader<false> StreamReaderLE;
#endif
} // end namespace Assimp
#endif // !! AI_STREAMREADER_H_INCLUDED