/*

* Copyright (c) 2002-2004 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include "jutils.h"

enum TJavaArrayPanic

{

    EBadOffsetIntoJavaArray,

    EWritingOverEndOfJavaArray,

    EBadOffsetIntoJavaArrayForRead,

    EReadingOverEndOfJavaArray,

};

/**

 * Accesses the Java array and copies its data into the native descriptor.

 * @param aJni The JNI environment.

 * @param aJavaBuffer The Java buffer to copy data from.

 * @param aOffset Start of data in Java buffer to copy. This is assumed to be valid.

 * @param aLength Amount of data to copy. This is assumed to be valid.

 * @param aNativeBuffer Target for data. This is assumed to be long enough.

 * @returns An error code.

 */

TInt ArrayUtils::CopyToNative(JNIEnv& aJni, jbyteArray aJavaBuffer,

                              TInt aOffset, TInt aLength, TDes8& aNativeBuffer)

{

    __ASSERT_DEBUG(aOffset <= aJni.GetArrayLength(aJavaBuffer),

                   User::Panic(_L("ArrayUtils"), EBadOffsetIntoJavaArrayForRead));

    __ASSERT_DEBUG(aLength <= aJni.GetArrayLength(aJavaBuffer) - aOffset,

                   User::Panic(_L("ArrayUtils"), EReadingOverEndOfJavaArray));

    aNativeBuffer.SetLength(aLength);

    TUint8* nativeBufferPtr = const_cast<TUint8*>(aNativeBuffer.Ptr());

    jbyte* jNativeBufferPtr = reinterpret_cast<jbyte*>(nativeBufferPtr);

    aJni.GetByteArrayRegion(aJavaBuffer, aOffset, aLength, jNativeBufferPtr);

    return KErrNone;

}

/**

 * Copies data from the native to the Java array.

 * @return The number of bytes copied.

 */

EXPORT_C TInt ArrayUtils::CopyToJava(JNIEnv& aJni, const TDesC8& aNativeBuffer,

                                     jbyteArray aJavaBuffer, TInt aOffset, TInt aLength)

{

    __ASSERT_DEBUG(aOffset <= aJni.GetArrayLength(aJavaBuffer),

                   User::Panic(_L("ArrayUtils"), EBadOffsetIntoJavaArray));

    __ASSERT_DEBUG(aLength <= aJni.GetArrayLength(aJavaBuffer) - aOffset,

                   User::Panic(_L("ArrayUtils"), EWritingOverEndOfJavaArray));

    TInt nativeBufferLength = aNativeBuffer.Length();

    TInt length = (nativeBufferLength < aLength) ? nativeBufferLength : aLength;

    TUint8* nativeBufferPtr = const_cast<TUint8*>(aNativeBuffer.Ptr());

    jbyte* jNativeBufferPtr = reinterpret_cast<jbyte*>(nativeBufferPtr);

    aJni.SetByteArrayRegion(aJavaBuffer, aOffset, length, jNativeBufferPtr);

    return length;

}

/**

 * Creates a Java array of strings from a native array of descriptors allocated

 * on the heap.

 * @param aJni The JNI environment.

 * @param aNativeArray The array of descriptors.

 * @return The newly created Java array of String objects, or NULL on error.

 */

jobjectArray ArrayUtils::CopyToNewJavaStringArray(JNIEnv& aJni,

        const RPointerArray<HBufC>& aNativeArray)

{

    jclass stringClass = aJni.FindClass("java/lang/String");

    if (stringClass == NULL)

    {

        return NULL;

    }

    TInt count = aNativeArray.Count();

    jobjectArray result = aJni.NewObjectArray(count, stringClass, NULL);

    if (result == NULL)

    {

        return NULL;

    }

    for (int ii = 0; ii< count; ii++)

    {

        jstring javaString = CreateJavaString(aJni, *aNativeArray[ii]);

        if (javaString == NULL)

        {

            aJni.DeleteLocalRef(result);

            return NULL;

        }

        aJni.SetObjectArrayElement(result, ii, javaString);

        aJni.DeleteLocalRef(javaString);

    }

    return result;

}