/*

File: Atom.m

Author: QuickTime DTS, some code originally from QTComponents

Change History (most recent first): <1> 10/20/04 initial release

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*/

#import "Atom.h"

#import "Utils.h"

@implementation Atom

+ (Atom *)withQTAtomContainer:(QTAtomContainer)inContainer atom:(QTAtom)inAtom

{

    Atom *theAtom;

    QTAtom currChild, nextChild;

    OSErr err;

    if (!inContainer && !inAtom) return nil;

    theAtom = [Atom new]; // [[[self class] alloc] init];

    if (theAtom) {

        theAtom->container = inContainer;

        theAtom->atom = inAtom;

        theAtom->numAtoms =  QTCountChildrenOfType(inContainer, inAtom, 0);

        theAtom->atoms = [NSMutableArray arrayWithCapacity:theAtom->numAtoms];

        [theAtom->atoms retain];

        currChild = 0;

        for(UInt16 i=0; i < theAtom->numAtoms; i++) {

            err = QTNextChildAnyType(inContainer, inAtom, currChild, &nextChild);

            if(err == noErr && nextChild) {

                [theAtom->atoms addObject: [Atom withQTAtomContainer:inContainer atom:nextChild]];

            } else {

                NSLog(@"Error %d getting item %d\n", err, i);

            }

            currChild = nextChild;

        }

    }

    return [theAtom autorelease];

}

- (void)dealloc

{

    [atoms release];

    [super dealloc];

}

- (unsigned)count

{

    return numAtoms;

}

- (NSString *)type

{

    QTAtomType type;

    OSErr err;

    QTAtomID atomId;

    err = QTGetAtomTypeAndID(container, atom, &type, &atomId);

    return OSTypeToNSString(type);

}

- (id)size

{

    SInt32 dataSize;

    Ptr data;

    if (numAtoms > 0) {

        // this atom is not a leaf atom

        return @"-";

    } else {

        OSErr err = QTGetAtomDataPtr(container, atom, &dataSize, &data);

        if (noErr == err) {

            return [NSString stringWithFormat:@"%d", dataSize];

        } else {

            return @"0";

        }

    }

}

- (id)value

{

    if(numAtoms > 0) {

        // this atom is not a leaf atom

        return [NSString stringWithFormat:@"Children: %d", numAtoms];

    } else {

        // this atom is a leaf atom and contains some data

        SInt32 dataSize;

        Ptr data;

        OSErr err;

        QTLockContainer(container);

        err = QTGetAtomDataPtr(container, atom, &dataSize, &data);

        if(err == noErr) {

            NSData *dataObj = [NSData dataWithBytes:data length:dataSize];

            if(*data == dataSize - 1) {

                // looks like a pascal string

                NSString *string;

                //string = [NSString stringWithCString:data+1 length:*data];

                string = PStringToNSString((unsigned char *)data);

                return [NSString stringWithFormat:@" '%@' %@", string, [dataObj description]];

            } else if (dataSize == 4) {

                // a type or number

                NSString *string;

                string = [NSString stringWithCString:data length:4];

                return [NSString stringWithFormat:@" '%@' %d %@", string, *(int *)data, [dataObj description]];

            } else {

                return dataObj;

            }

        } else {

            return [NSString stringWithFormat:@"QTGetAtomDataPtr, err: %d", err];

        }

        QTUnlockContainer(container);

    }

}

- (id)objectAtIndex:(unsigned)index

{

    return [atoms objectAtIndex:index];

}

@end