/**
 * @file llimagedimentionsinfo.h
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */


#ifndef LL_LLIMAGEDIMENSIONSINFO_H
#define LL_LLIMAGEDIMENSIONSINFO_H

#include "llapr.h"

//-----------------------------------------------------------------------------
// LLImageDimensionsInfo
// helper class to get image dimensions WITHOUT loading image to memore
// usefull when image may be too large...
//-----------------------------------------------------------------------------
class LLImageDimensionsInfo
{
public:
    LLImageDimensionsInfo():
        mData(NULL)
        ,mHeight(0)
        ,mWidth(0)
    {}
    ~LLImageDimensionsInfo()
    {
        clean();
    }

    bool load(const std::string& src_filename,U32 codec);
    S32 getWidth() const { return mWidth;}
    S32 getHeight() const { return mHeight;}

    const std::string& getLastError()
    {
        return mLastError;
    }

    const std::string& getWarningName()
    {
        return mWarning;
    }

protected:

    void clean()
    {
        mInfile.close();
        delete[] mData;
        mData = NULL;
        mWidth = 0;
        mHeight = 0;
    }

    U8* getData()
    {
        return mData;
    }


    void setLastError(const std::string& message, const std::string& filename)
    {
        std::string error = message;
        if (!filename.empty())
            error += std::string(" FILE: ") + filename;
        mLastError = error;
    }


    bool getImageDimensionsBmp();
    bool getImageDimensionsTga();
    bool getImageDimensionsPng();
    bool getImageDimensionsJpeg();

    S32 read_s32()
    {
        char p[4];
        mInfile.read(&p[0],4);
        S32 temp =  (((S32)p[3])       & 0x000000FF) |
                    (((S32)p[2] << 8 ) & 0x0000FF00) |
                    (((S32)p[1] << 16) & 0x00FF0000) |
                    (((S32)p[0] << 24) & 0xFF000000);

        return temp;
    }
    S32 read_reverse_s32()
    {
        char p[4];
        mInfile.read(&p[0],4);
        S32 temp =  (((S32)p[0])       & 0x000000FF) |
                    (((S32)p[1] << 8 ) & 0x0000FF00) |
                    (((S32)p[2] << 16) & 0x00FF0000) |
                    (((S32)p[3] << 24) & 0xFF000000);

        return temp;
    }

    U8 read_byte()
    {
        U8 bt;
        mInfile.read(&bt,1);
        return bt;
    }

    U16 read_short()
    {
        return read_byte() << 8 | read_byte();
    }

    /// Check if the file is not shorter than min_len bytes.
    bool checkFileLength(S32 min_len);

protected:
    LLAPRFile mInfile ;
    std::string mSrcFilename;

    std::string mLastError;
    std::string mWarning;

    U8* mData;

    S32 mWidth;
    S32 mHeight;
};
#endif