On 03/24/05 02:20, Mathias Bauer wrote:
Brian Raymond wrote:
I haven't looked at the code myself but I imagine it's using file header
data to determine what it is. Similar in general concept to UNIX file's
magic number tests.
That might be wrong but it's an educated guess :).
That's nearly correct.
MS documents have a "storage" based file format. Storages are also used
for the old binary StarOffice files and for WordPerfect documents.
A storage organizes its content in a way comparable to a zip tool, but
mostly without compression (IIRC only Powerpoint stores some streams in
a compressed mode). If you have a program to open such a storage it will
show you the subfolders and streams inside it like f.e. WinZip does it
for zip files.
OOo recognizes the particular format represented by such a storage by
searching for some known stream names that are typical for the format.
Storages also have a stream that contains a format descriptor, that
theoretically can be used for a detection (and is used for StarOffice
binary formats!), but the MS formats have shown that this is not
reliable for them, so we mostly ignore this desciptor and check only for
the stream names.
Best regards,
Mathias
If I wanted to see the code that checks the storage section to get the
stream names, where would be a good place to start?
Thanks in advance
Jimmy
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