2014-05-23 15:50 GMT-03:00 Craig Peterson <cr...@scootersoftware.com>:
> > Nice. I can do it, opening a new issue in bugtracker. > > Filename encoding in zip files is poorly defined. The current > APPNOTE.txt says that the only valid encoding is OEM 437, with UTF-8 if > a bit is set in the header, but those were recent additions, and in > practice Windows applications will generally use either the OEM or ANSI > codepage of the current system locale, and files generated on Unix will > be UTF-8 but won't have the language encoding bit set. > > Abbrevia's zip encoding/decoding tries to handle the issue in as > compatible a manner as possible. It stores the original filenames as > OEM/ANSI based on the current system, and stores a UTF-8 copy in an > extended header so there's a known way to decode it when changing > locales. When reading it has to use lookup tables to guess if the > filenames are likely OEM or ANSI. On Unicode-enabled Delphi releases > it's fully Unicode enabled; on FreePascal and older Delphi releases it > only supports ANSI filenames but still does proper encoding/decoding. > > The relevant code is in AbZipTyp.pas in TAbZipItem.SetFilename and > TAbZipItem.LoadFromStream if you want a reference. It's under the MPL, > but I'm the original author and I'm happy to relicense it if someone > else wants to incorporate the code into paszlib. > > > https://sourceforge.net/p/tpabbrevia/code/HEAD/tree/trunk/source/AbZipTyp.pas > > -- > Craig Peterson > Scooter Software Very nice. I have a question. Adding this extended header, can I open/uncompress the zip file normally in programs like 7z and WinRAR? -- Silvio Clécio My public projects - github.com/silvioprog
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