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archive/zip: add FileHeader.NonUTF8 field
The NonUTF8 field provides users with a way to explictly tell the ZIP writer to avoid setting the UTF-8 flag. This is necessary because many readers: 1) (Still) do not support UTF-8 2) And use the local system encoding instead Thus, even though character encodings other than CP-437 and UTF-8 are not officially supported by the ZIP specification, pragmatically the world has permitted use of them. When a non-standard encoding is used, it is the user's responsibility to ensure that the target system is expecting the encoding used (e.g., producing a ZIP file you know is used on a Chinese version of Windows). We adjust the detectUTF8 function to account for Shift-JIS and EUC-KR not being identical to ASCII for two characters. We don't need an API for users to explicitly specify that they are encoding with UTF-8 since all single byte characters are compatible with all other common encodings (Windows-1256, Windows-1252, Windows-1251, Windows-1250, IEC-8859, EUC-KR, KOI8-R, Latin-1, Shift-JIS, GB-2312, GBK) except for the non-printable characters and the backslash character (all of which are invalid characters in a path name anyways). Fixes #10741 Change-Id: I9004542d1d522c9137973f1b6e2b623fa54dfd66 Reviewed-on: https://go-review.googlesource.com/75592 Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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