root/shell/DataIO.h

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INCLUDED FROM


/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
 * Portions created by the Initial Developer are Copyright (C) 2004-2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Adobe AS3 Team
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */


#ifndef DATAIO_INCLUDED
#define DATAIO_INCLUDED

namespace avmshell
{
        template <class T>
        inline void CoreSwap(T& a, T& b)
        {
                T t = a;
                a = b;
                b = t;
        }

        inline void FlipU16(uint16_t& value)
        {
                uint8_t *pa = (uint8_t*)&(value);
                CoreSwap(pa[0], pa[1]);
        }

        inline void FlipU64(uint64_t& value)
        {
                uint8_t *pa = (uint8_t*)&(value);
                CoreSwap(pa[0], pa[7]);
                CoreSwap(pa[1], pa[6]);
                CoreSwap(pa[2], pa[5]);
                CoreSwap(pa[3], pa[4]);
        }

        inline void FlipU32(uint32_t& value)
        {
                uint8_t *pa = (uint8_t *)&(value);
                CoreSwap(pa[0], pa[3]);
                CoreSwap(pa[1], pa[2]);
        }

        enum ObjectEncoding {
                kAMF0 = 0,
                kAMF3 = 3,
                kEncodeDefault = kAMF3  
        };

        enum Endian
        {
                kBigEndian    = 0,
                kLittleEndian = 1
        };

        class DataIOBase
        {
        public:
                DataIOBase() { m_endian = kBigEndian; }

                virtual ~DataIOBase()
                { 
                        m_endian = kBigEndian;
                }
                
                
                Endian GetEndian() const { return m_endian; }
                void SetEndian(Endian endian) { m_endian = endian; }

                void ConvertU16(uint16_t& value)
                {
                        if (GetEndian() != GetNativeEndian())
                        {
                                FlipU16(value);
                        }
                }
                
                void ConvertU32(uint32_t& value)
                {
                        if (GetEndian() != GetNativeEndian())
                        {
                                FlipU32(value);
                        }
                }
                
                void ConvertU64(uint64_t& value)
                {
                        if (GetEndian() != GetNativeEndian())
                        {
                                FlipU64(value);
                        }
                }                       

                Endian GetNativeEndian() const
                {
                        #if defined(AVMPLUS_LITTLE_ENDIAN)
                        return kLittleEndian;
                        #elif defined(AVMPLUS_BIG_ENDIAN)
                        return kBigEndian;
                        #else
                        #error
                        #endif
                }
                        
        private:
                Endian m_endian;
        };
                
        typedef unsigned char U8;

        class DataInput : virtual public DataIOBase
        {
        public:
                DataInput(Toplevel *toplevel) : m_toplevel(toplevel) {}
                                
                virtual uint32_t Available() = 0;
                virtual void Read(void *buffer, uint32_t count) = 0;
                
                bool ReadBoolean();
                U8 ReadU8();
                unsigned short ReadU16();
                uint32_t ReadU32();
                float ReadFloat();
                double ReadDouble();
                String* ReadUTF();
                String* ReadUTFBytes(uint32_t length);
                void ReadByteArray(ByteArray& buffer, uint32_t offset, uint32_t count);

        protected:
                Toplevel* const m_toplevel;

                void ThrowEOFError();
                void ThrowMemoryError();
                void CheckEOF(uint32_t count);
        };

        class DataOutput : virtual public DataIOBase
        {
        public:
                DataOutput(Toplevel *toplevel) : m_toplevel(toplevel) { }

                virtual void Write(const void *buffer, uint32_t count) = 0;

                void WriteBoolean(bool value);
                void WriteU8(U8 value);
                void WriteU16(unsigned short value);
                void WriteU32(uint32_t value);
                void WriteFloat(float value);
                void WriteDouble(double value);
                void WriteUTF(String *str);
                void WriteUTFBytes(String *str);
                void WriteByteArray(ByteArray& buffer, uint32_t offset, uint32_t count);

        protected:
                Toplevel* const m_toplevel;

                void ThrowRangeError();

        };
}       

#endif /* DATAIO_INCLUDED */

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