assimp/code/DefaultIOSystem.cpp

/*
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Open Asset Import Library (assimp)
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Copyright (c) 2006-2018, assimp team



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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/
/** @file Default implementation of IOSystem using the standard C file functions */

#include <assimp/StringComparison.h>

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

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

#ifdef _WIN32
#include <windows.h>
#endif

using namespace Assimp;

// 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

// ------------------------------------------------------------------------------------------------
// Tests for the existence of a file at the given path.
bool DefaultIOSystem::Exists( const char* pFile) const
{
#ifdef _WIN32
    wchar_t fileName16[PATHLIMIT];

    bool isUnicode = IsTextUnicode(pFile, static_cast<int>(strlen(pFile)), NULL);
    if (isUnicode) {

        MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, pFile, -1, fileName16, PATHLIMIT);
        struct _stat64 filestat;
        if (0 != _wstat64(fileName16, &filestat)) {
            return false;
        }
    } else {
        FILE* file = ::fopen(pFile, "rb");
        if (!file)
            return false;

        ::fclose(file);
    }
#else
    FILE* file = ::fopen( pFile, "rb");
    if( !file)
        return false;

    ::fclose( file);
#endif
    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;
#ifdef _WIN32
    wchar_t fileName16[PATHLIMIT];
    bool isUnicode = IsTextUnicode(strFile, static_cast<int>(strlen(strFile)), NULL );
    if (isUnicode) {
        MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, strFile, -1, fileName16, PATHLIMIT);
        std::string mode8(strMode);
        file = ::_wfopen(fileName16, std::wstring(mode8.begin(), mode8.end()).c_str());
    } else {
        file = ::fopen(strFile, strMode);
    }
#else
    file = ::fopen(strFile, strMode);
#endif
    if (nullptr == file)
        return nullptr;

    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);
}

// ------------------------------------------------------------------------------------------------
// Convert a relative path into an absolute path
inline static void MakeAbsolutePath (const char* in, char* _out)
{
    ai_assert(in && _out);
#if defined( _MSC_VER ) || defined( __MINGW32__ )
    bool isUnicode = IsTextUnicode(in, static_cast<int>(strlen(in)), NULL);
    if (isUnicode) {
        wchar_t out16[PATHLIMIT];
        wchar_t in16[PATHLIMIT];
        MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, in, -1, out16, PATHLIMIT);
        wchar_t* ret = ::_wfullpath(out16, in16, PATHLIMIT);
        if (ret) {
            WideCharToMultiByte(CP_UTF8, MB_PRECOMPOSED, out16, -1, _out, PATHLIMIT, nullptr, nullptr);
        }
        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);
        }

    } else {
        char* ret = :: _fullpath(_out, in, PATHLIMIT);
        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);
        }
    }
#else
    // use realpath
    char* ret = realpath(in, _out);
    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);
    }
#endif
}

// ------------------------------------------------------------------------------------------------
// 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( const 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( const 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( const 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