root/shell/ByteArrayGlue.h

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 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
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
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 *   Adobe AS3 Team
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#ifndef BYTEARRAYGLUE_INCLUDED
#define BYTEARRAYGLUE_INCLUDED

namespace avmshell
{
        class ByteArray : public GlobalMemoryProvider
        {
        public:
                ByteArray();
                ByteArray(const ByteArray &lhs);
                ~ByteArray();

                U8 operator [] (uint32_t index) const;
                U8& operator [] (uint32_t index);
                void Push(U8 value);
                void Push(const U8 *buffer, uint32_t count);
                uint32_t GetLength() const { return m_length; }
                void SetLength(uint32_t newLength);
                bool Grow(uint32_t newCapacity);
                U8 *GetBuffer() const { return m_array; }

        // from GlobalMemoryProvider
        /*virtual*/ bool addSubscriber(GlobalMemorySubscriber* subscriber);
        /*virtual*/ bool removeSubscriber(GlobalMemorySubscriber* subscriber);

        protected:
                // singly linked list of all subscribers to this ByteArray...
                // in practice, there isn't much liklihood of too many
                // subscribers at a time and notifications should be rare
                // hence the slower, simpler, smaller structures and algorithms
 
                // links are removed explicitly via GlobalMemoryUnsubscribe
                // or implicitly when the backing store changes
                struct SubscriberLink : public MMgc::GCObject
                {
                        // weak reference to the subscriber DomainEnv so
                        // multiple DomainEnvs subscribing to the same
                        // ByteArray don't result in a DomainEnv not being
                        // collectable because a ByteArray refers to it and
                        // is referenced by another live DomainEnv
                        MMgc::GCWeakRef* weakSubscriber;
                        // next link
                        SubscriberLink* next;
                };
                SubscriberLink* m_subscriberRoot;
 
                void NotifySubscribers();
                void ThrowMemoryError();

                uint32_t m_capacity;
                uint32_t m_length;
                U8 *m_array;

                enum { kGrowthIncr = 4096 };
        };

        class ByteArrayFile : public ByteArray, public DataInput, public DataOutput
        {
        public:
                ByteArrayFile(Toplevel *toplevel);
                virtual ~ByteArrayFile()
                {
                        m_filePointer = 0; 
                }

                uint32_t GetFilePointer() { return m_filePointer; }
                void Seek(uint32_t filePointer) { m_filePointer = filePointer; }
                void SetLength(uint32_t newLength);
                uint32_t Available();
                void Read(void *buffer, uint32_t count);
                void Write(const void *buffer, uint32_t count);
                
        private:
                uint32_t m_filePointer;
        };
        
        class ByteArrayObject : public ScriptObject
        {
        public:
                ByteArrayObject(VTable *ivtable, ScriptObject *delegate);

                void fill(const void *b, uint32_t len);
        
                void checkNull(void *instance, const char *name);

                uint32_t getLength() { return m_byteArray.GetLength(); }
                void setLength(uint32_t newLength);

                virtual bool hasAtomProperty(Atom name) const;
                virtual void setAtomProperty(Atom name, Atom value);
                virtual Atom getAtomProperty(Atom name) const;
                virtual Atom getUintProperty(uint32_t i) const;
                virtual void setUintProperty(uint32_t i, Atom value);

                void readBytes(ByteArrayObject *bytes, uint32_t offset, uint32_t length);
                void writeBytes(ByteArrayObject *bytes, uint32_t offset, uint32_t length);

                String* _toString();

                // renamed to avoid preprocessor conflict with mozilla's zlib, which #define's compress and uncompress
                void zlib_compress();
                void zlib_uncompress();

                void writeBoolean(bool value);
                void writeByte(int value);
                void writeShort(int value);
                void writeInt(int value);
                void writeUnsignedInt(uint32_t value);
                void writeFloat(double value);
                void writeDouble(double value);
                void writeUTF(String *value);
                void writeUTFBytes(String *value);
        
                bool readBoolean();
                int readByte();
                int readUnsignedByte();
                int readShort();
                int readUnsignedShort();
                int readInt();
                uint32_t readUnsignedInt();
                double readFloat();
                double readDouble();
                String* readUTF();
                String* readUTFBytes(uint32_t length);          
                
                int get_bytesAvailable();
                int get_position();
                void set_position(int offset);
                inline int available() { return get_bytesAvailable(); }
                inline int getFilePointer() { return get_position(); }
                inline void seek(int offset) { set_position(offset); }

                uint32_t get_length();
                void set_length(uint32_t value);

                Stringp get_endian();
                void set_endian(Stringp type);
                
                ByteArray& GetByteArray() { return m_byteArray; }

                void writeFile(Stringp filename);

                /*virtual*/ GlobalMemoryProvider* getGlobalMemoryProvider() { return &m_byteArray; }

        private:
                MMgc::Cleaner c;
                ByteArrayFile m_byteArray;
                
                DECLARE_SLOTS_ByteArrayObject;
        };

        //
        // ByteArrayClass
        //
        
        class ByteArrayClass : public ClassClosure
        {
    public:
                ByteArrayClass(VTable *vtable);

                ScriptObject *createInstance(VTable *ivtable, ScriptObject *delegate);

                ByteArrayObject *readFile(Stringp filename);
                
                DECLARE_SLOTS_ByteArrayClass;
    };
}

#endif /* BYTEARRAYGLUE_INCLUDED */

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