CGPDFScannerCreate
CGPDFScannerGetContentStream
CGPDFScannerPopArray
CGPDFScannerPopBoolean
CGPDFScannerPopDictionary
CGPDFScannerPopInteger
CGPDFScannerPopName
CGPDFScannerPopNumber
CGPDFScannerPopObject
CGPDFScannerPopStream
CGPDFScannerPopString
CGPDFScannerRelease
CGPDFScannerRetain
CGPDFScannerScan