// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <IO/Encryption/EncryptedRandomAccessFile.h>
#include <fcntl.h>
#include <unistd.h>

namespace DB
{
void EncryptedRandomAccessFile::close()
{
    file->close();
}

off_t EncryptedRandomAccessFile::seek(off_t offset, int whence)
{
    file_offset = file->seek(offset, whence);
    return file_offset;
}

ssize_t EncryptedRandomAccessFile::read(char * buf, size_t size)
{
    ssize_t bytes_read = file->read(buf, size);
    stream->decrypt(file_offset, buf, bytes_read);
    file_offset += bytes_read;
    return bytes_read;
}

ssize_t EncryptedRandomAccessFile::pread(char * buf, size_t size, off_t offset) const
{
    ssize_t bytes_read = file->pread(buf, size, offset);
    stream->decrypt(offset, buf, bytes_read);
    return bytes_read;
}

} // namespace DB