rifffile.h

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// $Id: rifffile.h 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
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----------------------------------

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=================================XARAHEADEREND============================
 */
// Handling RIFF files (used by CDR importer)

#ifndef INC_RIFFFILE
#define INC_RIFFFILE

#include "riffform.h"
//#include "list.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "ccfile.h" - in camtypes.h [AUTOMATICALLY REMOVED]

typedef enum {
    RIFFOBJECTTYPE_NONE,            // initial condition
    RIFFOBJECTTYPE_CHUNK,
    RIFFOBJECTTYPE_LISTSTART,
    RIFFOBJECTTYPE_LISTEND,
    RIFFOBJECTTYPE_FILEEND
} RIFFObjectType;

// a class for storeing level information
class RIFFFileLevel : public ListItem
{
friend class RIFFFile;

protected:
    INT32 Start;        // the offset in the file at which this object starts
    INT32 End;      // where it ends
    FOURCC Type;    // and the type of this list
};

/********************************************************************************************

>   class RIFFFile : public CC_CLASS_MEMDUMP

    Author:     Ben_Summers (Xara Group Ltd) <camelotdev@xara.com>  
    Created:    21 03 95    
    Purpose:    Nice class for reading RIFF files, takes a CCFile in the Init() routine
                to get it's data from.
                This doesn't view a RIFF file quite how they're actually stored on the disc.
                It's viewed as a series of Objects. These objects can be
                    Chunks
                    Start of lists
                    End of lists
                    End of file
                An object inside a list has a higher level than the list and chunks just
                before the list.
                You ask for the next object with NextObject(). This reads in the details
                about the next object in the file, which you can then read with the Get
                functions.
                You can get at the data with GetChunkData - this will error if the last
                object is not a chunk. This function reads the data into a block you give it.
                Alternatively, use AquireChunkData which will read it into a block maintained
                by this class.
                Data is not read unless it has to be.
                RepeatCurrent() will repeat the current object, giving one level of rewind.
                Useful for reading files with naff structures.
                SkipToListEnd() will skip to the end of the list of the level given.
                
                It's recommended that you have a quite shufty at the documentation in the
                MSDN about RIFF files.  

********************************************************************************************/

class RIFFFile : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(RIFFFile);

public:
    RIFFFile();
    ~RIFFFile();

    FOURCC Init(CCLexFile *File, BOOL NoHeader = FALSE);
    BOOL NextObject(void);
    BOOL GetChunkData(ADDR Block, INT32 Size);
    BOOL GetChunkData(ADDR Block, INT32 Size, INT32 Offset);
    BOOL AquireChunkData(void);
    BOOL SkipToListEnd(UINT32 Level);
    BOOL RepeatCurrent(void);
    BOOL GetListContents(ADDR *Block, INT32 *Size);
    BOOL AquireListContents(INT32 *ListSize);

    // checks to see if a start of a file is a RIFF file. Returns the form type if it's
    // a valid RIFF header, or 0 if not
    static FOURCC CheckRIFFHeader(ADDR Header, DWORD FileSize);

    static BOOL FindChunkWithinListContents(ADDR ListContents, INT32 ListSize, FOURCC Type, INT32 Entry, ADDR *Chunk, INT32 *ChunkSize);

    RIFFObjectType GetObjType(void) {return ObjType;}
    FOURCC GetObjChunkType(void) {return ObjChunkType;}
    INT32 GetObjSize(void) {return ObjSize;}
    UINT32 GetObjLevel(void) {return ObjLevel;}
    ADDR GetAquiredData(void) {return AquiredData;}

    INT32 ProgressLimit(void) {return Size;}            // the last value progress will return
    INT32 ProgressNow(void) {return Location;}      // the current position for the progress bar

private:
    CCLexFile *File;            // the file the RIFF file comes from

    RIFFObjectType ObjType;     // object type of current object
    FOURCC ObjChunkType;        // type of current chunk (or type of list)
    INT32 ObjSize;              // size in bytes of current chunk
    UINT32 ObjLevel;                // level of object
    INT32 ObjLocation;          // location of start of the current object

    UINT32 CurrentLevel;            // level we're currently at

    INT32 Location;             // current location within the file
    INT32 Size;                 // size of the file

    BOOL GotData;               // Have we already got the data for this object?
                                // this is set even if it's only partially got

    INT32 AlignedObjectSize;        // the size of this object aligned to the actual
                                // size it takes up in the file

    List Levels;                // list of information about the levels we're on
                                // the tail tells us about the current level...
                                // items are deleted and created as we process the file

    BOOL RepeatObject;          // repeat the current object on the next NextObject()
    BOOL Error;                 // had an error

    BYTE *AquiredData;          // pointer to aquired data
    INT32 AquiredDataSize;      // size of aquired data block

private:
    BOOL EnsureAquiredSizeIsAtLeast(INT32 Size);
};

#endif  // INC_RIFFFILE

---