PlatformUtils.hpp

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 695427 2008-09-15 11:05:36Z borisk $
 */

#if !defined(XERCESC_INCLUDE_GUARD_PLATFORMUTILS_HPP)
#define XERCESC_INCLUDE_GUARD_PLATFORMUTILS_HPP

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

#include <xercesc/util/XMLFileMgr.hpp>
#include <xercesc/util/XMLMutexMgr.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;
#ifdef OS390
    static XMLTransService*     fgTransService2;
#endif

    static PanicHandler*        fgUserPanicHandler;

    static PanicHandler*        fgDefaultPanicHandler;

    static MemoryManager*       fgMemoryManager;

    static XMLFileMgr*          fgFileMgr;
    static XMLMutexMgr*         fgMutexMgr;

    static XMLMutex*            fgAtomicMutex;

    static bool                 fgXMLChBigEndian;




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

    static void Initialize(XMLSize_t initialDOMHeapAllocSize
                         , XMLSize_t maxDOMHeapAllocSize
                         , XMLSize_t maxDOMSubAllocationSize
                         , const char*          const locale = XMLUni::fgXercescDefaultLocale
                         , const char*          const nlsHome = 0
                         ,       PanicHandler*  const panicHandler = 0
                         ,       MemoryManager* const memoryManager = 0);

    static void Terminate();

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



    static XMLFileMgr* makeFileMgr(MemoryManager* const manager);

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

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

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

    static void writeBufferToFile
    (
          FileHandle     const  theFile
        , XMLSize_t             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 XMLMutexMgr* makeMutexMgr(MemoryManager* const manager);

    static void closeMutex(void* const mtxHandle, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    static void lockMutex(void* const mtxHandle);

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

    static void unlockMutex(void* const mtxHandle);




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



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

    static bool isNELRecognized();

    static void strictIANAEncoding(const bool state);

    static bool isStrictIANAEncoding();

    static inline XMLSize_t alignPointerForNewBlockAllocation(XMLSize_t ptrSize);

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


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

    static XMLNetAccessor* makeNetAccessor();

    static XMLTransService* makeTransService();

    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 XMLSize_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 XMLSize_t
XMLPlatformUtils::alignPointerForNewBlockAllocation(XMLSize_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
    static const XMLSize_t alignment = XML_PLATFORM_NEW_BLOCK_ALIGNMENT;
#else
    static const XMLSize_t alignment = (sizeof(void*) >= sizeof(double)) ? sizeof(void*) : sizeof(double);
#endif

    //    Calculate current alignment of pointer
    XMLSize_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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