/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   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 .

 */

#ifndef INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX

#define INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX

#include <com/sun/star/uno/Sequence.h>

class MemoryByteGrabber final

{

    const sal_Int8 *mpBuffer;

    sal_Int32 mnCurrent, mnEnd;

public:

    MemoryByteGrabber ( const css::uno::Sequence < sal_Int8 > & rBuffer )

    : mpBuffer ( rBuffer.getConstArray() )

    , mnCurrent ( 0 )

    , mnEnd ( rBuffer.getLength() )

    {

    }

    MemoryByteGrabber ( const sal_Int8* pBuffer, sal_Int32 nBufLen )

    : mpBuffer ( pBuffer )

    , mnCurrent ( 0 )

    , mnEnd ( nBufLen )

    {

    }

    MemoryByteGrabber(css::uno::Sequence<sal_Int8> &&) = delete;

    const sal_Int8 * getCurrentPos () const { return mpBuffer + mnCurrent; }

    sal_Int32 remainingSize() const { return mnEnd - mnCurrent; }

    // XInputStream chained

    /// @throws css::io::NotConnectedException

    /// @throws css::io::BufferSizeExceededException

    /// @throws css::io::IOException

    /// @throws css::uno::RuntimeException

    void skipBytes( sal_Int32 nBytesToSkip )

    {

        mnCurrent += nBytesToSkip;

    }

    sal_Int8 ReadUInt8()

    {

        if (mnCurrent + 1 > mnEnd)

            return 0;

        sal_uInt8 nInt8 = mpBuffer[mnCurrent++];

        return nInt8;

    }

    // XSeekable chained...

    sal_Int16 ReadInt16()

    {

        if (mnCurrent + 2 > mnEnd )

            return 0;

        sal_Int16 nInt16  =   mpBuffer[mnCurrent++] & 0xFF;

        nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;

        return nInt16;

    }

    sal_Int16 ReadUInt16()

    {

        if (mnCurrent + 2 > mnEnd )

            return 0;

        sal_uInt16 nInt16  =  mpBuffer[mnCurrent++] & 0xFF;

        nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;

        return nInt16;

    }

    sal_Int32 ReadInt32()

    {

        if (mnCurrent + 4 > mnEnd )

            return 0;

        sal_Int32 nInt32  =   mpBuffer[mnCurrent++] & 0xFF;

        nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;

        nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;

        nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;

        return nInt32;

    }

    sal_uInt32 ReadUInt32()

    {

        if (mnCurrent + 4 > mnEnd )

            return 0;

        sal_uInt32 nInt32  =   mpBuffer [mnCurrent++] & 0xFF;

        nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;

        nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;

        nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;

        return nInt32;

    }

    sal_uInt64 ReadUInt64()

    {

        if (mnCurrent + 8 > mnEnd)

            return 0;

        sal_uInt64 nInt64 = mpBuffer[mnCurrent++] & 0xFF;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 8;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 16;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 24;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 32;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 40;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 48;

        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 56;

        return nInt64;

    }

};

#endif

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */