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#import "XADSWFTagParser.h"
#import "CSFileHandle.h"
#import "CSZlibHandle.h"
NSString *SWFWrongMagicException=@"SWFWrongMagicException";
NSString *SWFNoMoreTagsException=@"SWFNoMoreTagsException";
@implementation XADSWFTagParser
+(XADSWFTagParser *)parserWithHandle:(CSHandle *)handle
{
return [[[XADSWFTagParser alloc] initWithHandle:handle] autorelease];
}
+(XADSWFTagParser *)parserForPath:(NSString *)path
{
CSFileHandle *handle=[CSFileHandle fileHandleForReadingAtPath:path];
return [[[XADSWFTagParser alloc] initWithHandle:handle] autorelease];
}
-(id)initWithHandle:(CSHandle *)handle
{
if((self=[super init]))
{
fh=[handle retain];
}
return self;
}
-(void)dealloc
{
[fh release];
[super dealloc];
}
-(void)parseHeader
{
uint8_t magic[4];
[fh readBytes:4 toBuffer:magic];
version=magic[3];
totallen=[fh readUInt32LE];
if((magic[0]!='F'&&magic[0]!='C')||magic[1]!='W'||magic[2]!='S')
[NSException raise:SWFWrongMagicException format:@"Not a Shockwave Flash file."];
if(magic[0]=='C')
{
CSZlibHandle *zh=[CSZlibHandle zlibHandleWithHandle:fh];
[fh release];
fh=[zh retain];
compressed=YES;
}
else
{
compressed=NO;
}
rect=SWFParseRect(fh);
fps=[fh readUInt16LE];
frames=[fh readUInt16LE];
nexttag=[fh offsetInFile];
currtag=0;
currlen=0;
currframe=0;
}
-(int)version { return version; }
-(BOOL)isCompressed { return compressed; }
-(SWFRect)rect { return rect; }
-(int)frames { return frames; }
-(int)framesPerSecond { return fps; }
-(int)nextTag
{
if(!nexttag) [NSException raise:SWFNoMoreTagsException format:@"No more tags available in the SWF file."];
if(currtag==SWFShowFrameTag) currframe++;
[fh seekToFileOffset:nexttag];
int tagval=[fh readUInt16LE];
currtag=tagval>>6;
if(currtag==0)
{
nexttag=0;
return 0;
}
currlen=tagval&0x3f;
if(currlen==0x3f) currlen=[fh readUInt32LE];
nexttag=[fh offsetInFile]+currlen;
return currtag;
}
-(int)tag { return currtag; }
-(int)tagLength { return currlen; }
-(int)tagBytesLeft { return nexttag-[fh offsetInFile]; }
-(int)frame { return currframe; }
-(double)time { return (double)currframe/((double)fps/256.0); }
-(CSHandle *)handle { return fh; }
-(CSHandle *)tagHandle { return [fh subHandleOfLength:[self tagBytesLeft]]; }
-(NSData *)tagContents { return [fh readDataOfLength:[self tagBytesLeft]]; }
-(void)parseDefineSpriteTag
{
spriteid=[fh readUInt16LE];
subframes=[fh readUInt16LE];
nextsubtag=[fh offsetInFile];
subtag=0;
sublen=0;
subframe=0;
}
-(int)spriteID { return spriteid; }
-(int)subFrames { return subframes; }
-(int)nextSubTag
{
if(!nextsubtag) [NSException raise:SWFNoMoreTagsException format:@"No more subtags available in the SWF file."];
if(subtag==SWFShowFrameTag) subframe++;
[fh seekToFileOffset:nextsubtag];
int tagval=[fh readUInt16LE];
subtag=tagval>>6;
if(subtag==0)
{
nextsubtag=0;
return 0;
}
sublen=tagval&0x3f;
if(sublen==0x3f) sublen=[fh readUInt32LE];
nextsubtag=[fh offsetInFile]+sublen;
return subtag;
}
-(int)subTag { return subtag; }
-(int)subTagLength { return sublen; }
-(int)subTagBytesLeft { return nextsubtag-[fh offsetInFile]; }
-(int)subFrame { return subframe; }
-(double)subTime { return (double)subframe/((double)fps/256.0); }
@end
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