tree 25ab0e37d343ffe72d273e1f128c602096c034c3
parent 06b378903d9f843123ceda346db98ee8fdb7fe49
author Brian Cairns <bcairns@google.com> 1709146488 -0800
committer Brian Cairns <bcairns@google.com> 1709147643 -0800

Eliminate use of IBM437 encoding in EPPlus.

IBM437 is the standard character encoding used by MS-DOS, and is the
de-facto "default" encoding for filenames in ZIP files. It is ASCII
compatible for all 7-bit ASCII characters.

Unfortunately, .NET Core does not support IBM437 by default; it
requires an additional NuGet package and a static method call to
register the obsolete encodings. We do not do this consistently, nor
does EPPlus.

Fortunately, we are only parsing OOXML packages (which are specialized
ZIP files), not general-purpose ZIP files. The OOXML standard
(ECMA-376) part 2 section 7.3.4 states that every non-ASCII character
in an OOXML part name (ZIP filename) must be percent encoded.
Therefore, file names in OOXML packages (ZIP files) only contain ASCII
characters and support for IBM437 is not required.

Change-Id: Ic652ded98476aaa662fefb3ec9ed4b73ec195315