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express: Fix reading zip file with comment at the end

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This commit is contained in:
rdb 2021-01-04 12:32:34 +01:00
parent f8039c0bc8
commit c52ea9a8df
1 changed files with 10 additions and 1 deletions
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11
panda/src/express/zipArchive.cxx
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@ -1222,11 +1222,14 @@ read_index() {
// Seek backwards until we have found the the end-of-directory record.
StreamReader reader(read, false);
while (comment_length <= 0xffff && fpos >= 20) {
//nassertr(fpos == read->tellg(), false);
if (reader.get_uint16() == comment_length) {
// This field references the distance to the end of the .zip file, so it
// could be the comment length field at the end of the record. Skip to the
// beginning of the record to see if the signature matches.
read->seekg(-22, std::ios::cur);
if (reader.get_uint32() == 0x06054b50) {
// Yes, got it.
eocd_offset = read->tellg() - (std::streamoff)4;
@ -1242,10 +1245,16 @@ read_index() {
found = true;
break;
}
// No, skip back to where we were and continue scanning for comments.
comment_length += 2;
read->seekg(22 - 4 - 4, std::ios::cur);
fpos -= 2;
continue;
}
comment_length += 2;
read->seekg(-2, std::ios::cur);
read->seekg(-4, std::ios::cur);
fpos -= 2;
}