assimp.assimp/code/DefaultIOSystem.cpp

/*
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Open Asset Import Library (assimp)
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  following disclaimer.

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/** @file Default implementation of IOSystem using the standard C file functions */

#include "DefaultIOSystem.h"
#include "DefaultIOStream.h"
#include "StringComparison.h"

#include "../include/assimp/DefaultLogger.hpp"
#include "../include/assimp/ai_assert.h"
#include <stdlib.h>


#ifdef __unix__
#include <sys/param.h>
#include <stdlib.h>
#endif

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Constructor. 
DefaultIOSystem::DefaultIOSystem()
{
	// nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Destructor. 
DefaultIOSystem::~DefaultIOSystem()
{
	// nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Tests for the existence of a file at the given path.
bool DefaultIOSystem::Exists( const char* pFile) const
{
	FILE* file = ::fopen( pFile, "rb");
	if( !file)
		return false;

	::fclose( file);
	return true;
}

// ------------------------------------------------------------------------------------------------
// Open a new file with a given path.
IOStream* DefaultIOSystem::Open( const char* strFile, const char* strMode)
{
	ai_assert(NULL != strFile);
	ai_assert(NULL != strMode);

	FILE* file = ::fopen( strFile, strMode);
	if( NULL == file) 
		return NULL;

	return new DefaultIOStream(file, (std::string) strFile);
}

// ------------------------------------------------------------------------------------------------
// Closes the given file and releases all resources associated with it.
void DefaultIOSystem::Close( IOStream* pFile)
{
	delete pFile;
}

// ------------------------------------------------------------------------------------------------
// Returns the operation specific directory separator
char DefaultIOSystem::getOsSeparator() const
{
#ifndef _WIN32
	return '/';
#else
	return '\\';
#endif
}

// ------------------------------------------------------------------------------------------------
// IOSystem default implementation (ComparePaths isn't a pure virtual function)
bool IOSystem::ComparePaths (const char* one, const char* second) const
{
	return !ASSIMP_stricmp(one,second);
}

// maximum path length
// XXX http://insanecoding.blogspot.com/2007/11/pathmax-simply-isnt.html 
#ifdef PATH_MAX
#	define PATHLIMIT PATH_MAX
#else
#	define PATHLIMIT 4096
#endif

// ------------------------------------------------------------------------------------------------
// Convert a relative path into an absolute path
inline void MakeAbsolutePath (const char* in, char* _out)
{
	ai_assert(in && _out);
	char* ret;
#ifdef _WIN32
	ret = ::_fullpath(_out, in,PATHLIMIT);
#else
    	// use realpath
    	ret = realpath(in, _out);
#endif  
	if(!ret) {
		// preserve the input path, maybe someone else is able to fix
		// the path before it is accessed (e.g. our file system filter)
		DefaultLogger::get()->warn("Invalid path: "+std::string(in));
		strcpy(_out,in);
	}  
}

// ------------------------------------------------------------------------------------------------
// DefaultIOSystem's more specialized implementation
bool DefaultIOSystem::ComparePaths (const char* one, const char* second) const
{
	// chances are quite good both paths are formatted identically,
	// so we can hopefully return here already
	if( !ASSIMP_stricmp(one,second) )
		return true;

	char temp1[PATHLIMIT];
	char temp2[PATHLIMIT];
	
	MakeAbsolutePath (one, temp1);
	MakeAbsolutePath (second, temp2);

	return !ASSIMP_stricmp(temp1,temp2);
}


std::string DefaultIOSystem::fileName(std::string path)
{
	std::string ret = path;
	std::size_t last = ret.find_last_of("\\/");
	if (last != std::string::npos) ret = ret.substr(last + 1);
	return ret;
}


std::string DefaultIOSystem::completeBaseName(std::string path)
{
	std::string ret = fileName(path);
	std::size_t pos = ret.find_last_of('.');
	if(pos != ret.npos) ret = ret.substr(0, pos);
	return ret;
}


std::string DefaultIOSystem::absolutePath(std::string path)
{
	std::string ret = path;
	std::size_t last = ret.find_last_of("\\/");
	if (last != std::string::npos) ret = ret.substr(0, last);
	return ret;
}

#undef PATHLIMIT