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bug#33133: 26.1.50; zlib-decompress-region too rigid
From: |
Noam Postavsky |
Subject: |
bug#33133: 26.1.50; zlib-decompress-region too rigid |
Date: |
Tue, 23 Oct 2018 20:26:59 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Katsumi Yamaoka <yamaoka@jpl.org> writes:
> Whereas `gzip -d' does, zlib-decompress-region doesn't decompress
> corrupted data of a certain kind. For instance, visiting
>
> https://www.gutenberg.org/no-such-page-exists
>
> using eww shows raw gzipped data. The data extracted is attached.
> As for `gzip -d', it says "unexpected end of file" in stderr.
> If there is no prospect to improve zlib-decompress-region, how
> about this workaround?
We could have zlib-decompress-region ignore unexpected eof as well,
e.g., the below (though it should obviously be enhanced to depend on a
new parameter):
--- i/src/decompress.c
+++ w/src/decompress.c
@@ -206,7 +206,7 @@ DEFUN ("zlib-decompress-region", Fzlib_decompress_region,
}
while (inflate_status == Z_OK);
- if (inflate_status != Z_STREAM_END)
+ if (inflate_status != Z_STREAM_END && inflate_status != Z_BUF_ERROR)
return unbind_to (count, Qnil);
unwind_data.start = 0;