/*

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above 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 materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef LIBJIMAGE_OSSUPPORT_HPP

#define LIBJIMAGE_OSSUPPORT_HPP

#ifdef WIN32

#include <Windows.h>

#else

#include <pthread.h>

#endif

class osSupport {

public:

    /**

     * Open a regular file read-only.

     * Return the file descriptor.

     */

    static jint openReadOnly(const char *path);

    /**

     * Close a file descriptor.

     */

    static jint close(jint fd);

    /**

     * Return the size of a regular file.

     */

    static jlong size(const char *path);

    /**

     * Read nBytes at offset into a buffer.

     */

    static jlong read(jint fd, char *buf, jlong nBytes, jlong offset);

    /**

     * Map nBytes at offset into memory and return the address.

     * The system chooses the address.

     */

    static void* map_memory(jint fd, const char *filename, size_t file_offset, size_t bytes);

    /**

     * Unmap nBytes of memory at address.

     */

    static int unmap_memory(void* addr, size_t bytes);

};

/**

 * A CriticalSection to protect a small section of code.

 */

class SimpleCriticalSection {

    friend class SimpleCriticalSectionLock;

private:

    void enter();

    void exit();

public:

    SimpleCriticalSection();

    //~SimpleCriticalSection(); // Cretes a dependency on Solaris on a C++ exit registration

private:

#ifdef WIN32

    CRITICAL_SECTION critical_section;

#else

    pthread_mutex_t mutex;

#endif // WIN32

};

/**

 * SimpleCriticalSectionLock instance.

 * The constructor locks a SimpleCriticalSection and the

 * destructor does the unlock.

 */

class SimpleCriticalSectionLock {

private:

    SimpleCriticalSection *lock;

public:

    SimpleCriticalSectionLock(SimpleCriticalSection *cslock) {

        this->lock = cslock;

        lock->enter();

    }

    ~SimpleCriticalSectionLock() {

        lock->exit();

    }

};

#endif  // LIBJIMAGE_OSSUPPORT_HPP