ZipLocalFileHeader::ZipLocalFileHeader(std::istream& inp, bool assumeHeaderRead, ParseCallback& callback):
_forceZip64(false),
_rawHeader(),
_startPos(inp.tellg()),
_endPos(-1),
_fileName(),
_lastModifiedAt(),
_extraField(),
_crc32(0),
_compressedSize(0),
_uncompressedSize(0)
{
poco_assert_dbg( (EXTRA_FIELD_POS+EXTRA_FIELD_LENGTH) == FULLHEADER_SIZE);
if (assumeHeaderRead)
_startPos -= ZipCommon::HEADER_SIZE;
parse(inp, assumeHeaderRead);
bool ok = callback.handleZipEntry(inp, *this);
if (ok)
{
if (searchCRCAndSizesAfterData())
{
char header[ZipCommon::HEADER_SIZE]={'\x00', '\x00', '\x00', '\x00'};
inp.read(header, ZipCommon::HEADER_SIZE);
if (std::memcmp(header, ZipDataInfo64::HEADER, sizeof(header)) == 0)
{
ZipDataInfo64 nfo(inp, true);
setCRC(nfo.getCRC32());
setCompressedSize(nfo.getCompressedSize());
setUncompressedSize(nfo.getUncompressedSize());
}
else
{
ZipDataInfo nfo(inp, true);
setCRC(nfo.getCRC32());
setCompressedSize(nfo.getCompressedSize());
setUncompressedSize(nfo.getUncompressedSize());
}
}
}
else
{
poco_assert_dbg(!searchCRCAndSizesAfterData());
ZipUtil::sync(inp);
}
_endPos = _startPos + getHeaderSize() + _compressedSize; // exclude the data block!
}
int ZipStreamBuf::readFromDevice(char* buffer, std::streamsize length)
{
if (!_ptrBuf) return 0; // directory entry
_ptrBuf->read(buffer, length);
int cnt = _ptrBuf->gcount();
if (cnt > 0)
{
_crc32.update(buffer, cnt);
}
else
{
if (_crc32.checksum() != _expectedCrc32)
{
if (_checkCRC)
throw ZipException("CRC failure");
else
{
// the CRC value is written directly after the data block
// parse it directly from the input stream
ZipDataInfo nfo(*_pIstr, false);
// now push back the header to the stream, so that the ZipLocalFileHeader can read it
Poco::Int32 size = static_cast<Poco::Int32>(nfo.getFullHeaderSize());
_expectedCrc32 = nfo.getCRC32();
const char* rawHeader = nfo.getRawHeader();
for (Poco::Int32 i = size-1; i >= 0; --i)
_pIstr->putback(rawHeader[i]);
if (!crcValid())
throw ZipException("CRC failure");
}
}
}
return cnt;
}
void ZipArchive::parse(std::istream& in, ParseCallback& pc)
{
// read 4 bytes
while (in.good() && !in.eof())
{
char header[ZipCommon::HEADER_SIZE]={'\x00', '\x00', '\x00', '\x00'};
in.read(header, ZipCommon::HEADER_SIZE);
if (in.eof())
return;
if (std::memcmp(header, ZipLocalFileHeader::HEADER, ZipCommon::HEADER_SIZE) == 0)
{
ZipLocalFileHeader entry(in, true, pc);
poco_assert (_entries.insert(std::make_pair(entry.getFileName(), entry)).second);
}
else if (std::memcmp(header, ZipFileInfo::HEADER, ZipCommon::HEADER_SIZE) == 0)
{
ZipFileInfo info(in, true);
FileHeaders::iterator it = _entries.find(info.getFileName());
if (it != _entries.end())
{
it->second.setStartPos(info.getRelativeOffsetOfLocalHeader());
}
poco_assert (_infos.insert(std::make_pair(info.getFileName(), info)).second);
}
else if (std::memcmp(header, ZipArchiveInfo::HEADER, ZipCommon::HEADER_SIZE) == 0)
{
ZipArchiveInfo nfo(in, true);
poco_assert (_disks.insert(std::make_pair(nfo.getDiskNumber(), nfo)).second);
}
else
{
if (_disks.empty())
throw Poco::IllegalStateException("Illegal header in zip file");
else
throw Poco::IllegalStateException("Garbage after directory header");
}
}
}
bool MakeJunction(const string& target, const string& junkpath, mgr_file::Attrs* attrs) {
if (mgr_file::Exists(junkpath))
return false;
if (!mgr_file::Exists(target))
return false;
mgr_file::Info nfo(target);
if (!nfo.IsDir())
return false;
mgr_file::MkDir(junkpath, attrs);
str::u16string tgt(target);
str::u16string junk(junkpath);
ResHandle hLink(OpenLinkHandle(str::u16string(junkpath).c_str(), GENERIC_WRITE));
if ((bool)hLink) {
str::u16string SubstituteName("\\??\\" + target);
REPARSE_BUF rdb;
rdb->ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
rdb.fill(tgt.c_str(), tgt.size(), SubstituteName.c_str(), SubstituteName.size());
if (rdb.set(junk.c_str())) {
return true;
}
}
mgr_file::Remove(junkpath);
return false;
}