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don't return uninitialized memory from bdiff.blocks()...
don't return uninitialized memory from bdiff.blocks() bdiff.blocks() returns a dummy match at the end of both files; the length of that chunk is never set, so it will sometimes contain random heap garbage. There are apparently workarounds for this elsewhere: # bdiff sometimes gives huge matches past eof, this check eats them,

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test-encode
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#!/bin/sh
hg init
cat > .hg/hgrc <<EOF
[encode]
*.gz = gunzip
[decode]
*.gz = gzip
EOF
echo "this is a test" | gzip > a.gz
hg add a.gz
hg ci -m "test" -d "1000000 0"
echo %% no changes
hg status
touch a.gz
echo %% no changes
hg status
echo %% uncompressed contents in repo
hg debugdata .hg/store/data/a.gz.d 0
echo %% uncompress our working dir copy
gunzip < a.gz
rm a.gz
hg co
echo %% uncompress our new working dir copy
gunzip < a.gz