6.1 EED

“Extended Entity Data” (EED) may be optionally attached to each object. They consist of a handle to the registered APPID, and a list of typed data. Each block is preceded with a size, the processing stops with size 0.

Internally libredwg stores each eed line as an array of num_eed structs. If the size > 0, then new block starts with a handle, an optional raw string (when reading from a DWG), and a number of typed data entries. Only the first eed struct of each block has a size, all subsequent eed structs have size 0.

Example:

  EED[0] size: 109 [BS]
  EED[0] handle: 5.2.762
  EED[0] code: 70 [RC] short: 2 [RS]
  EED[1] code: 70 [RC] short: 0 [RS]
  EED[2] code: 70 [RC] short: 0 [RS]
  EED[3] code: 11 [RC] 3dpoint: (0.000000, 0.000000, 0.000000) [3RD]
  EED[4] code: 11 [RC] 3dpoint: (1.000000, 0.000000, 0.000000) [3RD]
  EED[5] code: 11 [RC] 3dpoint: (0.000000, 1.000000, 0.000000) [3RD]
  EED[6] code: 11 [RC] 3dpoint: (0.000000, 0.000000, 1.000000) [3RD]
  EED[7] size: 6 [BS]
  EED[7] handle: 5.2.763
  EED[7] code: 70 [RC] short: 0 [RS]
  EED[8] code: 70 [RC] short: 0 [RS]
  EED[9] size: 23 [BS]
  EED[9] handle: 5.1.12
  EED[9] code: 0 [RC] string: "RTMaterial" len=10 cp=30
  EED[10] code: 5 [RC] entity: 0x6507000000000000 [RLL]
  - size: 0 [BS]

These 10 num_eed structs consist of 3 blocks with 3 size and handle entries. EED[0] starts with size 109, the handle pointing to object 762, 3 shorts and 4 points. The next block at EED[7] has size 6, the handle pointing to object 763 and 2 shorts. The last block at EED[9] has size 9, the handle pointing to object 12 (the APPID.ACAD application) and a string and an entity reference. The size is calculated by the needed room for all data code + values, without the handle. E.g. EED[7] size: 6 is 1 + 2 for EED[7] RC + RS, and 1 + 2 for EED[8] RC + RS.

Each data block consists of a RC code, and a variable value. A string may be a an old pre-r2007 ASCII string with a RC length (max 255 chars), a codepage and the string. Or a r2007+ wide string with a RS length (max 32767 chars) and a UCS-2 wide string.

decode stores both, the raw data, and the structured data. in_dxf just the data. encode prefers raw over the data.