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basenc: Fix basenc.pl GNU-compat tests pass (#9203)

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* fix(basenc): align base32 decode with GNU

* Add GNU-style basenc base32 tests

* Expand basenc base32 tests and simplify failures

Adds the GNU-style auto-padding/truncated cases to
tests/by-util/test_basenc.rs and rewrites the failure assertions to use
the chained fails().stdout_*(…).stderr_is(…) style for clarity.

* Restore GNU expectations for b32h_5 and b32h_6

Updates util/build-gnu.sh to stop forcing those two basenc tests to
expect empty stdout, so the GNU suite again checks for the leaked five
bytes before failure.

* Allow base32 decoder to auto-pad truncated blocks

Introduce PadResult, trim/pad incomplete base32 chunks, emit decoded
prefixes, and still return error: invalid input in line with GNU basenc.
This commit is contained in:
karanabe
2025-11-10 19:13:51 +01:00
committed by GitHub
parent eb223ba8b1
commit 364d9e9dff
4 changed files with 276 additions and 80 deletions
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util/build-gnu.sh
+1 -1
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@@ -268,7 +268,7 @@ sed -i -e "s|invalid suffix in --pages argument|invalid --pages argument|" \
# When decoding an invalid base32/64 string, gnu writes everything it was able to decode until
# it hit the decode error, while we don't write anything if the input is invalid.
sed -i "s/\(baddecode.*OUT=>\"\).*\"/\1\"/g" tests/basenc/base64.pl
sed -i "s/\(\(b2[ml]_[69]\|b32h_[56]\|z85_8\|z85_35\).*OUT=>\)[^}]*\(.*\)/\1\"\"\3/g" tests/basenc/basenc.pl
sed -i "s/\(\(b2[ml]_[69]\|z85_8\|z85_35\).*OUT=>\)[^}]*\(.*\)/\1\"\"\3/g" tests/basenc/basenc.pl
# add "error: " to the expected error message
sed -i "s/\$prog: invalid input/\$prog: error: invalid input/g" tests/basenc/basenc.pl