The Microsoft Excel File Format - OpenOffice.org

10.3 INDEX
10.3 INDEX
BIFF3W BIFF4W BIFF5W BIFF8W
— 020B H ??? ???
2do
This record stores the range of used rows and stream positions of several records of the current sheet. In particular the
position of the first DEFINEDNAME record and XF record is stored (BIFF2-BIFF4) and the position of a specific
record in each Row Block (the first ROW record in BIFF2-BIFF4, and the DBCELL record in BIFF5-BIFF8). This
stream position array also contains stream offsets to empty Row Blocks, they will point to the next extant Row Block.
The number of entries nm in this array can be calculated from the row range given in this record (rf is the index to the
first used row, rl is the index to the first row of unused tail of sheet): nm = (rl – rf – 1) / 32 + 1 (using integer
division).
For details about Row Blocks in a worksheet see ➜4.7.
Record INDEX, BIFF4W:
Offset Size Contents
0 4 Stream position of the first DEFINEDNAME record (➜5.33). The offset is relative to the
starting position of the SHEETHDR record (➜10.4) of the current sheet.
4 2 Index to first used row (rf, 0-based)
6 2 Index to first row of unused tail of sheet (rl, last used row + 1, 0-based)
8 4 Stream position of the first XF record (➜5.115). The offset is relative to the starting
position of the SHEETHDR record (➜10.4) of the current sheet.
12 4∙nm Array of nm stream positions to first ROW record (➜5.88) of each Row Block. The offsets
are relative to the starting position of the SHEETHDR record (➜10.4) of the current sheet.
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