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fast-import: export correctly marks larger than 2^20-1 

dump_marks_helper() has a bug when dumping marks larger than 2^20-1,
i.e., when the sparse array has more than two levels.  The bug was
that the 'base' counter was being shifted by 20 bits at level 3, and
then again by 10 bits at level 2, rather than a total shift of 20 bits
in this argument to the recursive call:

  (base + k) << m->shift

There are two ways to fix this correctly, the elegant:

  (base + k) << 10

and the one I chose due to edit distance:

  base + (k << m->shift)

Signed-off-by: Raja R Harinath <harinath@hurrynot.org>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Raja R Harinath 2010-07-13 17:21:48 +05:30 committed by Junio C Hamano
parent 5536934239
commit 7e7db5e452
2 changed files with 58 additions and 1 deletions
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2
fast-import.c
View File

@ -1666,7 +1666,7 @@ static void dump_marks_helper(FILE *f,
if (m->shift) {
for (k = 0; k < 1024; k++) {
if (m->data.sets[k])
dump_marks_helper(f, (base + k) << m->shift,
dump_marks_helper(f, base + (k << m->shift),
m->data.sets[k]);
}
} else {

57
t/t9300-fast-import.sh
View File

@ -166,6 +166,63 @@ test_expect_success \
test `git rev-parse --verify master:file2` \
= `git rev-parse --verify verify--import-marks:copy-of-file2`'
test_tick
mt=$(git hash-object --stdin < /dev/null)
: >input.blob
: >marks.exp
: >tree.exp
cat >input.commit <<EOF
commit refs/heads/verify--dump-marks
committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
data <<COMMIT
test the sparse array dumping routines with exponentially growing marks
COMMIT
EOF
i=0
l=4
m=6
n=7
while test "$i" -lt 27; do
cat >>input.blob <<EOF
blob
mark :$l
data 0
blob
mark :$m
data 0
blob
mark :$n
data 0
EOF
echo "M 100644 :$l l$i" >>input.commit
echo "M 100644 :$m m$i" >>input.commit
echo "M 100644 :$n n$i" >>input.commit
echo ":$l $mt" >>marks.exp
echo ":$m $mt" >>marks.exp
echo ":$n $mt" >>marks.exp
printf "100644 blob $mt\tl$i\n" >>tree.exp
printf "100644 blob $mt\tm$i\n" >>tree.exp
printf "100644 blob $mt\tn$i\n" >>tree.exp
l=$(($l + $l))
m=$(($m + $m))
n=$(($l + $n))
i=$((1 + $i))
done
sort tree.exp > tree.exp_s
test_expect_success 'A: export marks with large values' '
cat input.blob input.commit | git fast-import --export-marks=marks.large &&
git ls-tree refs/heads/verify--dump-marks >tree.out &&
test_cmp tree.exp_s tree.out &&
test_cmp marks.exp marks.large'
###
### series B
###