IOSystem.hpp

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/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------
 
Copyright (c) 2006-2020, assimp team
 
 
 
All rights reserved.
 
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with or without modification, are permitted provided that the following
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  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
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  derived from this software without specific prior
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*/
 
#pragma once
#ifndef AI_IOSYSTEM_H_INC
#define AI_IOSYSTEM_H_INC
 
#ifdef __GNUC__
#   pragma GCC system_header
#endif
 
#ifndef __cplusplus
#   error This header requires C++ to be used. aiFileIO.h is the \
    corresponding C interface.
#endif
 
#include "types.h"
 
#ifdef _WIN32
#   include <direct.h>  
#   include <stdlib.h>  
#   include <stdio.h>  
#else
#   include <sys/stat.h>
#   include <sys/types.h>
#   include <unistd.h>
#endif // _WIN32
 
#include <vector>
 
namespace Assimp    {
 
    class IOStream;
 
// ---------------------------------------------------------------------------
class ASSIMP_API IOSystem
#ifndef SWIG
    : public Intern::AllocateFromAssimpHeap
#endif
{
public:
 
    // -------------------------------------------------------------------
    IOSystem() AI_NO_EXCEPT;
 
    // -------------------------------------------------------------------
    virtual ~IOSystem();
 
    // -------------------------------------------------------------------
    AI_FORCE_INLINE bool Exists( const std::string& pFile) const;
 
    // -------------------------------------------------------------------
    virtual bool Exists( const char* pFile) const = 0;
 
    // -------------------------------------------------------------------
    virtual char getOsSeparator() const = 0;
 
    // -------------------------------------------------------------------
    virtual IOStream* Open(const char* pFile,
        const char* pMode = "rb") = 0;
 
    // -------------------------------------------------------------------
    inline IOStream* Open(const std::string& pFile,
        const std::string& pMode = std::string("rb"));
 
    // -------------------------------------------------------------------
    virtual void Close( IOStream* pFile) = 0;
 
    // -------------------------------------------------------------------
    virtual bool ComparePaths (const char* one,
        const char* second) const;
 
    // -------------------------------------------------------------------
    inline bool ComparePaths (const std::string& one,
        const std::string& second) const;
 
    // -------------------------------------------------------------------
    virtual bool PushDirectory( const std::string &path );
 
    // -------------------------------------------------------------------
    virtual const std::string &CurrentDirectory() const;
 
    // -------------------------------------------------------------------
    virtual size_t StackSize() const;
 
    // -------------------------------------------------------------------
    virtual bool PopDirectory();
 
    // -------------------------------------------------------------------
    virtual bool CreateDirectory( const std::string &path );
 
    // -------------------------------------------------------------------
    virtual bool ChangeDirectory( const std::string &path );
 
    virtual bool DeleteFile( const std::string &file );
 
private:
    std::vector<std::string> m_pathStack;
};
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
IOSystem::IOSystem() AI_NO_EXCEPT
: m_pathStack() {
    // empty
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
IOSystem::~IOSystem() {
    // empty
}
 
// ----------------------------------------------------------------------------
// For compatibility, the interface of some functions taking a std::string was
// changed to const char* to avoid crashes between binary incompatible STL
// versions. This code her is inlined,  so it shouldn't cause any problems.
// ----------------------------------------------------------------------------
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
IOStream* IOSystem::Open(const std::string& pFile, const std::string& pMode) {
    // NOTE:
    // For compatibility, interface was changed to const char* to
    // avoid crashes between binary incompatible STL versions
    return Open(pFile.c_str(),pMode.c_str());
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::Exists( const std::string& pFile) const {
    // NOTE:
    // For compatibility, interface was changed to const char* to
    // avoid crashes between binary incompatible STL versions
    return Exists(pFile.c_str());
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::ComparePaths (const std::string& one, const std::string& second) const {
    // NOTE:
    // For compatibility, interface was changed to const char* to
    // avoid crashes between binary incompatible STL versions
    return ComparePaths(one.c_str(),second.c_str());
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::PushDirectory( const std::string &path ) {
    if ( path.empty() ) {
        return false;
    }
 
    m_pathStack.push_back( path );
 
    return true;
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
const std::string &IOSystem::CurrentDirectory() const {
    if ( m_pathStack.empty() ) {
        static const std::string Dummy("");
        return Dummy;
    }
    return m_pathStack[ m_pathStack.size()-1 ];
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
size_t IOSystem::StackSize() const {
    return m_pathStack.size();
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::PopDirectory() {
    if ( m_pathStack.empty() ) {
        return false;
    }
 
    m_pathStack.pop_back();
 
    return true;
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::CreateDirectory( const std::string &path ) {
    if ( path.empty() ) {
        return false;
    }
 
#ifdef _WIN32
    return 0 != ::_mkdir( path.c_str() );
#else
    return 0 != ::mkdir( path.c_str(), 0777 );
#endif // _WIN32
}
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::ChangeDirectory( const std::string &path ) {
    if ( path.empty() ) {
        return false;
    }
 
#ifdef _WIN32
    return 0 != ::_chdir( path.c_str() );
#else
    return 0 != ::chdir( path.c_str() );
#endif // _WIN32
}
 
 
// ----------------------------------------------------------------------------
AI_FORCE_INLINE
bool IOSystem::DeleteFile( const std::string &file ) {
    if ( file.empty() ) {
        return false;
    }
    const int retCode( ::remove( file.c_str() ) );
    return ( 0 == retCode );
}
} 
 
#endif //AI_IOSYSTEM_H_INC