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[lbendlin]

For what it's worth, here is the code to unpack the physical zip file into a NSData structure. Caveat: will only work correctly if the ZIP contains one file.

-(NSData*) UnzipFileToData {
	NSMutableData* data = [[NSMutableData alloc] init];
	int ret = unzGoToFirstFile( _unzFile );
	unsigned char		buffer[4096] = {0};
	if( ret!=UNZ_OK )
	{
		[self OutputErrorMessage:@"Failed to go to first file"];
		return data;
	}
	
	ret = unzOpenCurrentFile( _unzFile );
	if( ret!=UNZ_OK )
	{
		[self OutputErrorMessage:@"Error opening file"];
		return data;
	}
	// reading data and write to data object
	int read = 1 ;
	while( read > 0 )
	{
		read=unzReadCurrentFile(_unzFile, buffer, 4096);
		if( read > 0 )
		{
			[data appendBytes:buffer length:read];
		}
		else if( read<0 )
		{
			[self OutputErrorMessage:@"Failed to reading zip file"];
			break;
		}
		else 
			break;				
	}
	unzCloseCurrentFile( _unzFile );
	ret = unzGoToNextFile( _unzFile );
	return data;
}