Indicates the length, in bytes, of the not compressed custom header in the resource associated with the data stream.
property CustomHeaderSize: Integer;
Read CustomHeaderSize to determine the number of bytes in the custom not compressed header. This custom header could be used to store user information that will not be compressed or encrypted.
This property is read-only.
The header is started from ECLStreamHeaderSize bytes of the beginning.
In case you don't use ECL stream, to get this size directly from the resource, read 4 bytes starting from CustomHeaderSizeOffset offset from the beginning of the resource data.