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#include <IO/WriteBufferFromEncryptedFile.h>
#if USE_SSL
namespace DB
{
WriteBufferFromEncryptedFile::WriteBufferFromEncryptedFile(
size_t buffer_size_,
std::unique_ptr<WriteBufferFromFileBase> out_,
const String & key_,
const FileEncryption::Header & header_,
size_t old_file_size)
: WriteBufferDecorator<WriteBufferFromFileBase>(std::move(out_), buffer_size_, nullptr, 0)
, header(header_)
, flush_header(!old_file_size)
, encryptor(header.algorithm, key_, header.init_vector)
{
encryptor.setOffset(old_file_size);
}
WriteBufferFromEncryptedFile::~WriteBufferFromEncryptedFile()
{
finalize();
}
void WriteBufferFromEncryptedFile::finalizeBefore()
{
/// If buffer has pending data - write it.
next();
/// Note that if there is no data to write an empty file will be written, even without the initialization vector
/// (see nextImpl(): it writes the initialization vector only if there is some data ready to write).
/// That's fine because DiskEncrypted allows files without initialization vectors when they're empty.
}
void WriteBufferFromEncryptedFile::sync()
{
/// If buffer has pending data - write it.
next();
out->sync();
}
void WriteBufferFromEncryptedFile::nextImpl()
{
if (!offset())
return;
if (flush_header)
{
header.write(*out);
flush_header = false;
}
encryptor.encrypt(working_buffer.begin(), offset(), *out);
}
}
#endif
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