/*

     File: DataSource.h

 Abstract: Part of CoreAudio Utility Classes

  Version: 1.1

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*/

#ifndef __DataSource_h__

#define __DataSource_h__

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)

    #include <AudioToolbox/AudioFile.h>

#else

    #include <ConditionalMacros.h>

    #include "AudioFile.h"

#endif

#include <stdlib.h>

#include <stdio.h>

#include <stdexcept>

#include "CAAutoDisposer.h"

//////////////////////////////////////////////////////////////////////////////////////////

class DataSource

{

public:

    DataSource(Boolean inCloseOnDelete);

    virtual ~DataSource();

    virtual OSStatus GetSize32(UInt32& outSize)

    {

        SInt64 size64;

        OSStatus err = GetSize(size64);

        if (err) return err;

        if (size64 > 0x00000000FFFFffffLL) return kAudioFileDoesNotAllow64BitDataSizeError;

        outSize = (UInt32)size64;

        return noErr;

    }

    virtual OSStatus GetSize(SInt64& outSize) =0;

    virtual OSStatus SetSize(SInt64 inSize)=0;

    virtual OSStatus GetPos(SInt64& outPos) const=0; 

    /* non seekable data sources should use fsAtMark for the positionMode (or SEEK_CUR with offset zero, 

        or SEEK_SET with offset equal to the current position in the stream, in other words no seeking from the 

        current position is allowed.)

    */

    virtual OSStatus ReadBytes( UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                void *buffer, 

                                UInt32* actualCount)=0;

    virtual OSStatus WriteBytes(UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                const void *buffer, 

                                UInt32* actualCount)=0;

    virtual void SetCloseOnDelete(Boolean inFlag) { mCloseOnDelete = inFlag; }

    virtual Boolean CanSeek() const=0;

    virtual Boolean CanGetSize() const=0;

    virtual Boolean CanSetSize() const=0;

    virtual Boolean CanRead() const=0;

    virtual Boolean CanWrite() const=0;

protected:

    Boolean mCloseOnDelete;

    /* utility method */

    SInt64 CalcOffset(  UInt16 positionMode, 

                        SInt64 positionOffset,

                        SInt64 currentOffset,

                        SInt64 size);

};

//////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////////////////

/*

    Initialize with a Macintosh file fork ref num as obtained from FSOpenFork.

*/

#if 0

class MacFile_DataSource : public DataSource

{

    FSIORefNum mFileNum;

    SInt8 mPermissions;

public:

    MacFile_DataSource( FSIORefNum inForkRefNum, SInt8 inPermissions, Boolean inCloseOnDelete);

    virtual ~MacFile_DataSource();

    virtual OSStatus GetSize(SInt64& outSize);

    virtual OSStatus GetPos(SInt64& outPos) const; 

    virtual OSStatus SetSize(SInt64 inSize);

    virtual OSStatus ReadBytes( UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                void *buffer, 

                                UInt32* actualCount);

    virtual OSStatus WriteBytes(UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                const void *buffer, 

                                UInt32* actualCount);

    virtual Boolean CanSeek() const { return true; }

    virtual Boolean CanGetSize() const { return true; }

    virtual Boolean CanSetSize() const { return true; }

    virtual Boolean CanRead() const { return mPermissions & kAudioFileReadPermission; }

    virtual Boolean CanWrite() const { return mPermissions & kAudioFileWritePermission; }

};

#endif

class UnixFile_DataSource : public DataSource

{

    int   mFileD;

    SInt8 mPermissions;

    UInt32 mNoCache;

    SInt64 mCachedSize;

    SInt64 mFilePointer;

public:

    UnixFile_DataSource( int inFD, SInt8 inPermissions, Boolean inCloseOnDelete);

    virtual ~UnixFile_DataSource();

    virtual OSStatus GetSize(SInt64& outSize);

    virtual OSStatus GetPos(SInt64& outPos) const; 

    virtual OSStatus SetSize(SInt64 inSize);

    virtual OSStatus ReadBytes( UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                void *buffer, 

                                UInt32* actualCount);

    virtual OSStatus WriteBytes(UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                const void *buffer, 

                                UInt32* actualCount);

    virtual Boolean CanSeek() const { return true; }

    virtual Boolean CanGetSize() const { return true; }

    virtual Boolean CanSetSize() const { return true; }

    virtual Boolean CanRead() const { return mPermissions & kAudioFileReadPermission; }

    virtual Boolean CanWrite() const { return mPermissions & kAudioFileWritePermission; }

private:

    SInt64  UFCurrentOffset (UInt16     positionMode, 

                            SInt64      positionOffset);

};

//////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////////////////

/*

    A wrapper that caches the wrapped source's header.

*/

class Cached_DataSource : public DataSource

{

    DataSource* mDataSource;

    CAAutoFree<UInt8> mHeaderCache;

    UInt32 mHeaderCacheSize;

    CAAutoFree<UInt8> mBodyCache;

    UInt32 mBodyCacheSize;

    UInt32 mBodyCacheCurSize;

    SInt64 mBodyCacheOffset;

    SInt64 mOffset;

    Boolean mOwnDataSource;

public:

    Cached_DataSource(DataSource* inDataSource, UInt32 inHeaderCacheSize = 4096, UInt32 inBodyCacheSize = 32768, Boolean inOwnDataSource = true)

                    : DataSource(false), 

                    mDataSource(inDataSource), mHeaderCacheSize(inHeaderCacheSize), 

                    mBodyCacheSize(inBodyCacheSize), mBodyCacheCurSize(0), mBodyCacheOffset(-1), 

                    mOffset(0),

                    mOwnDataSource(inOwnDataSource)

                {

                }

    virtual ~Cached_DataSource()

                {

                    if (mOwnDataSource) delete mDataSource;

                }

    virtual OSStatus GetSize(SInt64& outSize) { return mDataSource->GetSize(outSize); }

    virtual OSStatus GetPos(SInt64& outPos) const { return mDataSource->GetPos(outPos); } 

    virtual OSStatus SetSize(SInt64 inSize) { return mDataSource->SetSize(inSize); }

    virtual OSStatus ReadBytes(     UInt16 positionMode, 

                                    SInt64 positionOffset, 

                                    UInt32 requestCount, 

                                    void *buffer, 

                                    UInt32* actualCount);

    virtual OSStatus WriteBytes(    UInt16 positionMode, 

                                    SInt64 positionOffset, 

                                    UInt32 requestCount, 

                                    const void *buffer, 

                                    UInt32* actualCount);

    OSStatus ReadFromHeaderCache(   SInt64 offset, 

                                    UInt32 requestCount,

                                    void *buffer, 

                                    UInt32* actualCount);

    virtual Boolean CanSeek() const { return mDataSource->CanSeek(); }

    virtual Boolean CanGetSize() const { return mDataSource->CanGetSize(); }

    virtual Boolean CanSetSize() const { return mDataSource->CanSetSize(); }

    virtual Boolean CanRead() const { return mDataSource->CanRead(); }

    virtual Boolean CanWrite() const { return mDataSource->CanWrite(); }

};

//////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////////////////

/* This class calls user supplied routines on demand. */

class Seekable_DataSource : public DataSource

{

    void * mClientData;

    SInt64 mOffset;

    AudioFile_ReadProc mReadFunc;

    AudioFile_WriteProc mWriteFunc;

    AudioFile_GetSizeProc mSizeFunc;

    AudioFile_SetSizeProc mSetSizeFunc;

public:

    Seekable_DataSource(    void *                              inClientData,

                            AudioFile_ReadProc                  inReadFunc, 

                            AudioFile_WriteProc                 inWriteFunc, 

                            AudioFile_GetSizeProc               inGetSizeFunc,

                            AudioFile_SetSizeProc               inSetSizeFunc

                    );

    virtual ~Seekable_DataSource();

    virtual OSStatus GetSize(SInt64& outSize);

    virtual OSStatus GetPos(SInt64& outPos) const { outPos = mOffset; return noErr; }; 

    virtual OSStatus SetSize(SInt64 inSize);

    virtual OSStatus ReadBytes( UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                void *buffer, 

                                UInt32* actualCount);

    virtual OSStatus WriteBytes(UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                const void *buffer, 

                                UInt32* actualCount);

    virtual Boolean CanSeek() const { return true; }

    virtual Boolean CanGetSize() const { return mSizeFunc != 0; }

    virtual Boolean CanSetSize() const { return mSetSizeFunc != 0; }

    virtual Boolean CanRead() const { return mReadFunc != 0; }

    virtual Boolean CanWrite() const { return mWriteFunc != 0; }

};

//////////////////////////////////////////////////////////////////////////////////////////

class Buffer_DataSource : public DataSource

{

    UInt32 mDataByteSize;

    const char * mData;

    SInt64 mStartOffset;

    SInt64 mOffset;

public:

    Buffer_DataSource(  UInt32          inDataByteSize,

                        const void *    inData,

                        SInt64          inStartOffset = 0

                    ) : DataSource(false), mDataByteSize(inDataByteSize), mData((const char*)inData), mStartOffset(inStartOffset), mOffset(mStartOffset) {}

    virtual ~Buffer_DataSource() {}

    virtual OSStatus GetSize(SInt64& outSize) { outSize = mDataByteSize + mStartOffset; return noErr; }

    virtual OSStatus GetPos(SInt64& outPos) const { outPos = mOffset; return noErr; }; 

    virtual OSStatus SetSize(SInt64 inSize) { throw std::runtime_error("not writable"); }

    virtual OSStatus ReadBytes( UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                void *buffer, 

                                UInt32* actualCount);

    virtual OSStatus WriteBytes(UInt16 positionMode, 

                                SInt64 positionOffset, 

                                UInt32 requestCount, 

                                const void *buffer, 

                                UInt32* actualCount) { throw std::runtime_error("not writable"); }

    virtual Boolean CanSeek() const { return true; }

    virtual Boolean CanGetSize() const { return true; }

    virtual Boolean CanSetSize() const { return false; }

    virtual Boolean CanRead() const { return true; }

    virtual Boolean CanWrite() const { return false; }

};

//////////////////////////////////////////////////////////////////////////////////////////

#endif