OCAD 11 Dateiformat
This is a description of the file format of OCAD 11 files.
Be aware that this is an internal format and may change in future versions.
Data types used
OCAD is written in 32-bit Delphi and this description uses the names for the data types as they appear in Delphi. However the same data types are available in other development systems like C++.
|Integer||32-bit signed integer|
|SmallInt||16-bit signed integer|
|Word||16-bit unsigned integer|
Pascal-style string. The first byte contains the number of characters followed by the characters. The string is not zero-terminated. The maximum number of characters is x. It occupies x + 1 bytes in the file.
|Double||64-bit floating point number|
|TDPoly||A special data type (64-bit) used for all coordinates and text. It is defined as
TDPoly = record
The lowest 8 Bits are used to mark special points:
Marks for the x-coordinate:
Marks for y-coordinate:
The upper 24 bits contain the coordinate value measured in units of 0.01 mm.
Note: all file positions are in bytes starting from the beginning of the file.
OCAD files start with a file header.
|TFileHeader = record||// Size = 48 Byte|
|OCADMark: SmallInt;||// 3245 (hex 0cad)|
|FileType: Byte;||File type (0: normal map, 1: course setting project)|
|FileStatus: Byte;||// Not used|
|Version: SmallInt;||// 11|
|Subversion: Byte;||number of subversion (0 for 11.00, 1 for 11.1 etc.)|
|SubSubversion: Byte;||number of subsubversion (0 for 11.0.0, 1 for 11.0.1)|
|FirstSymbolIndexBlock: integer;||file position of the first symbol index block|
|ObjectIndexBlk: integer;||file position of object index block -> TObjectIndexBlock // max 65536 * 256 objects|