2.11.8 RoundTripAnimationHashAtom
Referenced by: RoundTripMainMasterRecord, RoundTripSlideRecord
An atom record that specifies a checksum for animation data.
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rh |
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animationChecksum |
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rh (8 bytes): A RecordHeader structure (section 2.3.1) that specifies the header for this record. Sub-fields are further specified in the following table.
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Field
Meaning
rh.recVer
MUST be 0x0.
rh.recInstance
MUST be 0x000.
rh.recType
MUST be an RT_RoundTripAnimationHashAtom12Atom.
rh.recLen
MUST be 0x00000004.
animationChecksum (4 bytes): An unsigned integer that specifies the checksum of the animation data.
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Let corresponding slide be specified as the SlideContainer record (section 2.5.1) that contains this RoundTripAnimationHashAtom record.
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The data used to calculate the checksum is all fields in the VisualSoundAtom record contained within the corresponding slide, computed sequentially in 4-byte pieces. The other input to the checksum calculation is all of the bytes of the spid field of the OfficeArtFSP record ([MS-ODRAW] section 2.2.40) that specify the shape identifier of each shape on the corresponding slide. The checksum value is a cyclic redundancy check (CRC) logical exclusive or (XOR) hash of each consecutive 4-byte sequence in the specified data.