/******************************************************************************
 *
 * Project:  Hierarchical Data Format Release 5 (HDF5)
 * Purpose:  HDF5 convenience functions.
 * Author:   Frank Warmerdam <warmerdam@pobox.com>
 *
 ******************************************************************************
 * Copyright (c) 2009, Frank Warmerdam <warmerdam@pobox.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "gh5_convenience.h"

CPL_CVSID("$Id: gh5_convenience.cpp 37927 2017-04-09 05:09:10Z goatbar $");

/************************************************************************/
/*                    GH5_FetchAttribute(CPLString)                     */
/************************************************************************/

bool GH5_FetchAttribute( hid_t loc_id, const char *pszAttrName,
                         CPLString &osResult, bool bReportError )

{
    hid_t hAttr = H5Aopen_name(loc_id, pszAttrName);

    osResult.clear();

    if( hAttr < 0 )
    {
        if( bReportError )
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Attempt to read attribute %s failed, not found.",
                     pszAttrName);
        return false;
    }

    hid_t hAttrTypeID = H5Aget_type(hAttr);
    hid_t hAttrNativeType = H5Tget_native_type(hAttrTypeID, H5T_DIR_DEFAULT);

    bool retVal = false;
    if( H5Tget_class(hAttrNativeType) == H5T_STRING )
    {
        const size_t nAttrSize = H5Tget_size(hAttrTypeID);
        char *pachBuffer = static_cast<char *>(CPLCalloc(nAttrSize + 1, 1));
        H5Aread(hAttr, hAttrNativeType, pachBuffer);

        osResult = pachBuffer;
        CPLFree(pachBuffer);

        retVal = true;
    }
    else
    {
        if( bReportError )
            CPLError(
                CE_Failure, CPLE_AppDefined,
                "Attribute %s of unsupported type for conversion to string.",
                pszAttrName);

        retVal = false;
    }

    H5Tclose(hAttrNativeType);
    H5Tclose(hAttrTypeID);
    H5Aclose(hAttr);
    return retVal;
}

/************************************************************************/
/*                      GH5_FetchAttribute(double)                      */
/************************************************************************/

bool GH5_FetchAttribute( hid_t loc_id, const char *pszAttrName,
                         double &dfResult, bool bReportError )

{
    const hid_t hAttr = H5Aopen_name(loc_id, pszAttrName);

    dfResult = 0.0;
    if( hAttr < 0 )
    {
        if( bReportError )
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Attempt to read attribute %s failed, not found.",
                     pszAttrName);
        return false;
    }

    hid_t hAttrTypeID = H5Aget_type(hAttr);
    hid_t hAttrNativeType = H5Tget_native_type(hAttrTypeID, H5T_DIR_DEFAULT);

    // Confirm that we have a single element value.
    hid_t hAttrSpace = H5Aget_space(hAttr);
    hsize_t anSize[64] = {};
    int nAttrDims = H5Sget_simple_extent_dims(hAttrSpace, anSize, NULL);

    int i, nAttrElements = 1;

    for( i = 0; i < nAttrDims; i++ )
    {
        nAttrElements *= (int)anSize[i];
    }

    if( nAttrElements != 1 )
    {
        if( bReportError )
            CPLError(CE_Failure, CPLE_AppDefined,
                     "Attempt to read attribute %s failed, count=%d, not 1.",
                     pszAttrName, nAttrElements);

        H5Sclose(hAttrSpace);
        H5Tclose(hAttrNativeType);
        H5Tclose(hAttrTypeID);
        H5Aclose(hAttr);
        return false;
    }

    // Read the value.
    void *buf = CPLMalloc(H5Tget_size(hAttrNativeType));
    H5Aread(hAttr, hAttrNativeType, buf);

    // Translate to double.
    if( H5Tequal(H5T_NATIVE_INT, hAttrNativeType) )
        dfResult = *((int *)buf);
    else if( H5Tequal(H5T_NATIVE_FLOAT,    hAttrNativeType) )
        dfResult = *((float *)buf);
    else if( H5Tequal(H5T_NATIVE_DOUBLE,    hAttrNativeType) )
        dfResult = *((double *)buf);
    else
    {
        if( bReportError )
            CPLError(
                CE_Failure, CPLE_AppDefined,
                "Attribute %s of unsupported type for conversion to double.",
                pszAttrName);
        CPLFree(buf);

        H5Sclose(hAttrSpace);
        H5Tclose(hAttrNativeType);
        H5Tclose(hAttrTypeID);
        H5Aclose(hAttr);

        return false;
    }

    CPLFree(buf);

    H5Sclose(hAttrSpace);
    H5Tclose(hAttrNativeType);
    H5Tclose(hAttrTypeID);
    H5Aclose(hAttr);
    return true;
}

/************************************************************************/
/*                          GH5_GetDataType()                           */
/*                                                                      */
/*      Transform HDF5 datatype to GDAL datatype                        */
/************************************************************************/
GDALDataType GH5_GetDataType(hid_t TypeID)
{
    if( H5Tequal(H5T_NATIVE_CHAR,        TypeID) )
        return GDT_Byte;
    else if( H5Tequal(H5T_NATIVE_SCHAR,  TypeID) )
        return GDT_Byte;
    else if( H5Tequal(H5T_NATIVE_UCHAR,  TypeID) )
        return GDT_Byte;
    else if( H5Tequal(H5T_NATIVE_SHORT,  TypeID) )
        return GDT_Int16;
    else if( H5Tequal(H5T_NATIVE_USHORT, TypeID) )
        return GDT_UInt16;
    else if( H5Tequal(H5T_NATIVE_INT,    TypeID) )
        return GDT_Int32;
    else if( H5Tequal(H5T_NATIVE_UINT,   TypeID) )
        return GDT_UInt32;
    else if( H5Tequal(H5T_NATIVE_LONG,   TypeID) )
    {
        if( sizeof(long) == 4 )
            return GDT_Int32;
        else
            return GDT_Unknown;
    }
    else if( H5Tequal(H5T_NATIVE_ULONG,  TypeID) )
    {
        if( sizeof(unsigned long) == 4 )
            return GDT_UInt32;
        else
            return GDT_Unknown;
    }
    else if( H5Tequal(H5T_NATIVE_FLOAT,  TypeID) )
        return GDT_Float32;
    else if( H5Tequal(H5T_NATIVE_DOUBLE, TypeID) )
        return GDT_Float64;
    else if( H5Tequal(H5T_NATIVE_LLONG,  TypeID) )
        return GDT_Unknown;
    else if( H5Tequal(H5T_NATIVE_ULLONG, TypeID) )
        return GDT_Unknown;
    else if( H5Tequal(H5T_NATIVE_DOUBLE, TypeID) )
        return GDT_Unknown;

    return GDT_Unknown;
}
