PlatformUtils.hpp

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/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Id: PlatformUtils.hpp 180016 2005-06-04 19:49:30Z jberry $
 */


#if !defined(PLATFORMUTILS_HPP)
#define PLATFORMUTILS_HPP

#include <xercesc/util/XMLException.hpp>
#include <xercesc/util/PanicHandler.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class XMLMsgLoader;
class XMLNetAccessor;
class XMLTransService;
class MemoryManager;
class XMLMutex;

//
//  For internal use only
//
//  This class provides a simple abstract API via which lazily evaluated
//  data can be cleaned up.
//
class XMLUTIL_EXPORT XMLDeleter
{
public :
    virtual ~XMLDeleter();

protected :
    XMLDeleter();

private :
    XMLDeleter(const XMLDeleter&);
    XMLDeleter& operator=(const XMLDeleter&);
};


class XMLUTIL_EXPORT XMLPlatformUtils
{
public :


    static XMLNetAccessor*      fgNetAccessor;

    static XMLTransService*     fgTransService;

    static PanicHandler*        fgUserPanicHandler;
    
    static PanicHandler*        fgDefaultPanicHandler;

    static MemoryManager*       fgMemoryManager;
    
    static MemoryManager*       fgArrayMemoryManager;

    static XMLMutex*            fgAtomicMutex;
    



    static void Initialize(const char*          const locale = XMLUni::fgXercescDefaultLocale
                         , const char*          const nlsHome = 0
                         ,       PanicHandler*  const panicHandler = 0
                         ,       MemoryManager* const memoryManager = 0
                         ,       bool                 toInitStatics = false);

    static void Terminate();

    static void panic
    (
        const   PanicHandler::PanicReasons    reason
    );
    


    static unsigned int curFilePos(FileHandle theFile
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static void closeFile(FileHandle theFile
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static unsigned int fileSize(FileHandle theFile
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static FileHandle openFile(const char* const fileName
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static FileHandle openFile(const XMLCh* const fileName
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static FileHandle openFileToWrite(const char* const fileName
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static FileHandle openFileToWrite(const XMLCh* const fileName
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static FileHandle openStdInHandle(MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static unsigned int readFileBuffer
    (
                FileHandle      theFile
        , const unsigned int    toRead
        ,       XMLByte* const  toFill
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager
    );

    static void writeBufferToFile
    (
          FileHandle     const  theFile
        , long                  toWrite
        , const XMLByte* const  toFlush
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager
    );

    static void resetFile(FileHandle theFile
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);



    static XMLCh* getFullPath
    (
        const XMLCh* const srcPath
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );

    static XMLCh* getCurrentDirectory
    (
        MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );

    static inline bool isAnySlash(XMLCh c);
    
    static void   removeDotSlash(XMLCh* const srcPath
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    static void   removeDotDotSlash(XMLCh* const srcPath
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    static bool isRelative(const XMLCh* const toCheck
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
        );

    static XMLCh* weavePaths
    (
        const   XMLCh* const    basePath
        , const XMLCh* const    relativePath
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );


    static unsigned long getCurrentMillis();


    static void closeMutex(void* const mtxHandle);

    static void lockMutex(void* const mtxHandle);

    static void* makeMutex(MemoryManager* manager = XMLPlatformUtils::fgMemoryManager);

    static void unlockMutex(void* const mtxHandle);




    static XMLMsgLoader* loadMsgSet(const XMLCh* const msgDomain);



    static void* compareAndSwap
    (
                void**      toFill
        , const void* const newValue
        , const void* const toCompare
    );




    static int atomicIncrement(int& location);

    static int atomicDecrement(int& location);


    static void recognizeNEL(bool state
        , MemoryManager* const manager  = XMLPlatformUtils::fgMemoryManager);

    static bool isNELRecognized();

    static void strictIANAEncoding(const bool state);

    static bool isStrictIANAEncoding();
                
        static inline size_t alignPointerForNewBlockAllocation(size_t ptrSize);

private :
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    XMLPlatformUtils();


    static XMLMsgLoader* loadAMsgSet(const XMLCh* const msgDomain);

    static XMLNetAccessor* makeNetAccessor();

    static XMLTransService* makeTransService();

    static void platformInit();

    static void platformTerm();

    static int  searchSlashDotDotSlash(XMLCh* const srcPath);



    static bool fgMemMgrAdopted;

};


MakeXMLException(XMLPlatformUtilsException, XMLUTIL_EXPORT)


// ---------------------------------------------------------------------------
//  XMLPlatformUtils: alignPointerForNewBlockAllocation
// ---------------------------------------------------------------------------
//  Calculate alignment required by platform for a new
//      block allocation. We use this in our custom allocators
//      to ensure that returned blocks are properly aligned.
//  Note that, although this will take a pointer and return the position
//  at which it should be placed for correct alignment, in our code
//  we normally use size_t parameters to discover what the alignment
//  of header blocks should be.  Thus, if this is to be
//  used for the former purpose, to make compilers happy
//  some casting will be necessary - neilg.
//
//  Note: XML_PLATFORM_NEW_BLOCK_ALIGNMENT may be specified on a
//        per-architecture basis to dictate the alignment requirements
//        of the architecture. In the absense of this specification,
//        this routine guesses at the correct alignment value.
//
//        A XML_PLATFORM_NEW_BLOCK_ALIGNMENT value of zero is illegal.
//        If a platform requires absolutely no alignment, a value
//        of 1 should be specified ("align pointers on 1 byte boundaries").
//
inline size_t
XMLPlatformUtils::alignPointerForNewBlockAllocation(size_t ptrSize)
{
        //      Macro XML_PLATFORM_NEW_BLOCK_ALIGNMENT may be defined
        //      as needed to dictate alignment requirements on a
        //      per-architecture basis. In the absense of that we
        //      take an educated guess.
        #ifdef XML_PLATFORM_NEW_BLOCK_ALIGNMENT
                size_t alignment = XML_PLATFORM_NEW_BLOCK_ALIGNMENT;
        #else
                size_t alignment = (sizeof(void*) >= sizeof(double)) ? sizeof(void*) : sizeof(double);
        #endif
        
        //      Calculate current alignment of pointer
        size_t current = ptrSize % alignment;
        
        //      Adjust pointer alignment as needed
        return (current == 0)
                 ? ptrSize
                 : (ptrSize + alignment - current);
}



// ---------------------------------------------------------------------------
//  XMLDeleter: Public Destructor
// ---------------------------------------------------------------------------
inline XMLDeleter::~XMLDeleter()
{
}

// ---------------------------------------------------------------------------
//  XMLDeleter: Hidden constructors and operators
// ---------------------------------------------------------------------------
inline XMLDeleter::XMLDeleter()
{
}

XERCES_CPP_NAMESPACE_END

#endif

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