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gunzip: inflate_codes(): add fix from upstream gzip to prevent false CRC error

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Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Joakim Tjernlund 2010-02-08 18:55:15 +01:00 committed by Denys Vlasenko
parent 80f4275629
commit 0866b36900
1 changed files with 4 additions and 1 deletions
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5
archival/libunarchive/decompress_unzip.c
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@ -575,13 +575,16 @@ static NOINLINE int inflate_codes(STATE_PARAM_ONLY)
do {
/* Was: nn -= (e = (e = GUNZIP_WSIZE - ((dd &= GUNZIP_WSIZE - 1) > w ? dd : w)) > nn ? nn : e); */
/* Who wrote THAT?? rewritten as: */
unsigned delta;
dd &= GUNZIP_WSIZE - 1;
e = GUNZIP_WSIZE - (dd > w ? dd : w);
delta = w > dd ? w - dd : dd - w;
if (e > nn) e = nn;
nn -= e;
/* copy to new buffer to prevent possible overwrite */
if (w - dd >= e) { /* (this test assumes unsigned comparison) */
if (delta >= e) {
memcpy(gunzip_window + w, gunzip_window + dd, e);
w += e;
dd += e;