template <typename T> T readType(BufReader* reader, bool inverted) {
// TODO for C++11 to static_assert that T is integral
T t = ConstDataView(static_cast<const char*>(reader->skip(sizeof(T)))).readNative<T>();
if (inverted)
return ~t;
return t;
}
std::string BSONElement::_asCode() const {
switch (type()) {
case mongo::String:
case Code:
return std::string(valuestr(), valuestrsize() - 1);
case CodeWScope:
return std::string(codeWScopeCode(),
ConstDataView(valuestr()).read<LittleEndian<int>>() - 1);
default:
log() << "can't convert type: " << (int)(type()) << " to code" << std::endl;
}
uassert(10062, "not code", 0);
return "";
}
bool TerarkDbRecordStore::findRecord(OperationContext* txn,
const RecordId& id,
RecordData* out) const {
if (id.isNull())
return false;
llong recIdx = id.repr() - 1;
CompositeTable* tab = m_table->m_tab.get();
auto& td = m_table->getMyThreadData();
tab->getValue(recIdx, &td.m_buf, &*td.m_dbCtx);
SharedBuffer bson = td.m_coder.decode(&tab->rowSchema(), td.m_buf);
// size_t bufsize = sizeof(SharedBuffer::Holder) + bson.objsize();
int bufsize = ConstDataView(bson.get()).read<LittleEndian<int>>();
*out = RecordData(bson, bufsize);
return true;
}
void ValidateInterimFileHasData(const boost::filesystem::path& dir, bool hasData) {
char buf[sizeof(std::int32_t)];
auto interimFile = FTDCUtil::getInterimFile(dir);
ASSERT_EQUALS(boost::filesystem::exists(interimFile), hasData);
if (!hasData) {
return;
}
std::fstream stream(interimFile.c_str());
stream.read(&buf[0], sizeof(buf));
ASSERT_EQUALS(4, stream.gcount());
std::uint32_t bsonLength = ConstDataView(buf).read<LittleEndian<std::int32_t>>();
ASSERT_EQUALS(static_cast<bool>(bsonLength), hasData);
}
StatusWith<BSONObj> FTDCFileReader::readDocument() {
if (!_stream.is_open()) {
return {ErrorCodes::FileNotOpen, "open() needs to be called first."};
}
char buf[sizeof(std::int32_t)];
_stream.read(buf, sizeof(buf));
if (sizeof(buf) != _stream.gcount()) {
// Did we read exactly zero bytes and hit the eof?
// Then return an empty document to indicate we are done reading the file.
if (0 == _stream.gcount() && _stream.eof()) {
return BSONObj();
}
return {ErrorCodes::FileStreamFailed,
str::stream() << "Failed to read 4 bytes from file \'" << _file.generic_string()
<< "\'"};
}
std::uint32_t bsonLength = ConstDataView(buf).read<LittleEndian<std::int32_t>>();
// Reads past the end of the file will be caught below
// The interim file sentinel is 8 bytes of zero.
if (bsonLength == 0) {
return BSONObj();
}
// Reads past the end of the file will be caught below
if (bsonLength > _fileSize || bsonLength < BSONObj::kMinBSONLength) {
return {ErrorCodes::InvalidLength,
str::stream() << "Invalid BSON length found in file \'" << _file.generic_string()
<< "\'"};
}
// Read the BSON document
_buffer.resize(bsonLength);
// Stuff the length into the front
memcpy(_buffer.data(), buf, sizeof(std::int32_t));
// Read the length - 4 bytes from the file
std::int32_t readSize = bsonLength - sizeof(std::int32_t);
_stream.read(_buffer.data() + sizeof(std::int32_t), readSize);
if (readSize != _stream.gcount()) {
return {ErrorCodes::FileStreamFailed,
str::stream() << "Failed to read " << readSize << " bytes from file \'"
<< _file.generic_string()
<< "\'"};
}
ConstDataRange cdr(_buffer.data(), _buffer.data() + bsonLength);
// TODO: Validated only validates objects based on a flag which is the default at the moment
auto swl = cdr.read<Validated<BSONObj>>();
if (!swl.isOK()) {
return swl.getStatus();
}
return {swl.getValue().val};
}
BSONObj BSONElement::codeWScopeObject() const {
verify(type() == CodeWScope);
int strSizeWNull = ConstDataView(value() + 4).read<LittleEndian<int>>();
return BSONObj(value() + 4 + 4 + strSizeWNull);
}
