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58 lines
2.4 KiB
Bash
Executable File
58 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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# Ensure that reference compressed files are still decompressible, and
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# that their corresponding inputs still compress to precisely the same bytes.
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# For a "normal" compression program, one must not require that the encoded
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# bytes remain the same. The compression algorithm may change. What normally
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# matters is solely that the decompressed result is the same as the input
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# to the compressor. However, here, with gzip's current moribund state,
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# it is fine to require that. In particular, this test ensures that
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# a CRC-perf change doesn't accidentally cause trouble. It's not enough
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# that gzip decompress files the compressor has just created: it must
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# continue to decompress old compressed outputs, too.
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# Copyright 2024-2026 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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# limit so don't run it by default.
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. "${srcdir=.}/init.sh"; path_prepend_ ..
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od -An -tx1 </dev/null || skip_ "od does not support -An and -tx1"
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fail=0
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cat <<EOF > exp || framework_failure_
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: 1f 8b 08 00 00 00 00 00 00 03 03 00 00 00 00 00 00 00 00 00
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a: 1f 8b 08 00 00 00 00 00 00 03 4b 04 00 43 be b7 e8 01 00 00 00
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b: 1f 8b 08 00 00 00 00 00 00 03 4b 02 00 f9 ef be 71 01 00 00 00
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c: 1f 8b 08 00 00 00 00 00 00 03 4b 06 00 6f df b9 06 01 00 00 00
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yyy: 1f 8b 08 00 00 00 00 00 00 03 ab ac ac 04 00 ea 81 45 73 03 00 00 00
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zzzzzzzzzzz: 1f 8b 08 00 00 00 00 00 00 03 ab aa 82 03 00 55 97 5b a7 0b 00 00 00
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EOF
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# Ensure that compressing these simple strings always produces the same bytes.
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for i in '' a b c yyy zzzzzzzzzzz; do
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echo $i: $(printf %s "$i" | gzip | od -An -tx1)
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done > out || framework_failure_
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compare exp out || fail=1
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# Each output stream must inflate the original input.
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for i in '' a b c yyy zzzzzzzzzzz; do
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in=$(printf %s "$i" | gzip | gzip -d)
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test "$i" = "$in" || fail=1
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done
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Exit $fail
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