negate numbers showing incorrectly when created in openoffice or neooffice

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What steps will reproduce the problem?
1.Create a spreadsheet with negative numbers
-1 -5 -10 -50 -100 -250
2. Save the document as an xls file (97/2000/xp)
3. Read the spreadsheet using php-excell-reader

What is the expected output?
The data should show
-1 -5 -10 -50 -100 -250

What do you see instead?
-1 1073741819 1073741814 1073741774 1073741724 1073741574

Please provide any additional information below.

Debugging this shows that we are in
case SPREADSHEET_EXCEL_READER_TYPE_MULRK:

and that in the call to function _GetIEEE754($rknum) we fall into the case
($rknum & 0x02) != 0)

```

Original issue reported on code.google.com by `npmar...@gmail.com` on 8 Jun 2009 at 6:16

Attachments:
- [sample.xls](https://storage.googleapis.com/google-code-attachments/php-excel-reader/issue-28/comment-0/sample.xls)

Start by reproducing the issue with the attached sample.xls and trace the SPREADSHEET_EXCEL_READER_TYPE_MULRK path into _GetIEEE754($rknum), especially the branch for ($rknum & 0x02) != 0. Done means negative values from the OpenOffice or NeoOffice-generated XLS are read as -1, -5, -10, -50, -100, and -250 rather than large positive numbers.

Written by the indexing model from the issue text.