fdo#53588 Assume cdir being in the last 1k of the file to speed-up search
fdo#53588 Assume cdir being in the last 1k of the file to speed-up search

Change-Id: I25291c52d9f0117c70c48781c2eb575bb6b374ff

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core