Rework EscherRecordHolder parsing

Modify the parsing done by EscherRecordHolder to be more deterministic. The format of the OfficeArtContent structure, which the EscherRecordHolder represents, is well defined in the MS-DOC spec. A clear class structure makes it easier to reason about the availability of data.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1887008 13f79535-47bb-0310-9956-ffa450edef68
1 file changed