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| • HEADER_ | All Header variables | |
| • OBJECTS_ | All Entities and Objects | |
| • CLASSES | The dynamically loaded class types | |
| • HANDLES | The sorted handle map (relative handle and size) of all objects | |
| • R2004_Header | R2004 Section meta-data to find the INFO and SYSTEM_MAP | |
| • UNKNOWN | Unknown Section | |
| • SummaryInfo | Some dwg meta-data | |
| • Preview | The Thumbnail BMP or WMF data | |
| • VBAProject | VBA Section | |
| • AppInfo | Which product and version exactly created that DWG | |
| • AppInfoHistory | AppInfoHistory Section | |
| • FileDepList | Features and File Dependencies. Image files, fonts, xrefs, plotconfigs. | |
| • AcDS | The AcDsPrototype_1b DataStorage, used mostly for binary ACIS blobs | |
| • RevHistory | Revision History | |
| • Security | Password Info | |
| • ObjFreeSpace | Some Objects meta-data | |
| • Template | Contains one Measurement Header variable. | |
| • AuxHeader | In case the original Header gets lost | |
| • Signature | Signature Section | |
| • INFO | The info of all used sections | |
| • SYSTEM_MAP | The map of all used sections and its chunked pages |
The r2000 format (used for r13-r2000) knows the following 6 sections:
HEADER CLASSES HANDLES 2NDHEADER MEASUREMENT AUXHEADER (only r2000)
The r2004 and r2007 format (used for r2004-r2018) knows the following sections:
R2004_Header UNKNOWN SUMMARYINFO PREVIEW VBAPROJECT APPINFO APPINFOHISTORY FILEDEPLIST ACDS REVHISTORY SECURITY OBJECTS OBJFREESPACE TEMPLATE HANDLES CLASSES AUXHEADER HEADER SIGNATURE INFO SYSTEM_MAP
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