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/* $Id: EBMLWriter.h $ */
/** @file
* EBMLWriter.h - EBML writer.
*/
/*
* Copyright (C) 2013-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#ifndef MAIN_INCLUDED_EBMLWriter_h
#define MAIN_INCLUDED_EBMLWriter_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <stack>
#include <iprt/critsect.h>
#include <iprt/file.h>
#include <VBox/com/string.h>
/** No flags set. */
#define VBOX_EBMLWRITER_FLAG_NONE 0
/** The file handle was inherited. */
#define VBOX_EBMLWRITER_FLAG_HANDLE_INHERITED RT_BIT(0)
class EBMLWriter
{
public:
typedef uint32_t EbmlClassId;
private:
struct EbmlSubElement
{
uint64_t offset;
EbmlClassId classId;
EbmlSubElement(uint64_t offs, EbmlClassId cid) : offset(offs), classId(cid) {}
};
/** Stack of EBML sub elements. */
std::stack<EbmlSubElement> m_Elements;
/** The file's handle. */
RTFILE m_hFile;
/** The file's name (path). */
com::Utf8Str m_strFile;
/** Flags. */
uint32_t m_fFlags;
public:
EBMLWriter(void)
: m_hFile(NIL_RTFILE)
, m_fFlags(VBOX_EBMLWRITER_FLAG_NONE) { }
virtual ~EBMLWriter(void) { close(); }
public:
int createEx(const char *a_pszFile, PRTFILE phFile);
int create(const char *a_pszFile, uint64_t fOpen);
void close(void);
/** Returns the file name. */
const com::Utf8Str& getFileName(void) { return m_strFile; }
/** Returns file size. */
uint64_t getFileSize(void) { return RTFileTell(m_hFile); }
/** Get reference to file descriptor */
inline const RTFILE &getFile(void) { return m_hFile; }
/** Returns available space on storage. */
uint64_t getAvailableSpace(void);
/**
* Returns whether the file is open or not.
*
* @returns True if open, false if not.
*/
bool isOpen(void) { return RTFileIsValid(m_hFile); }
public:
EBMLWriter &subStart(EbmlClassId classId);
EBMLWriter &subEnd(EbmlClassId classId);
EBMLWriter &serializeString(EbmlClassId classId, const char *str);
EBMLWriter &serializeUnsignedInteger(EbmlClassId classId, uint64_t parm, size_t size = 0);
EBMLWriter &serializeFloat(EbmlClassId classId, float value);
EBMLWriter &serializeData(EbmlClassId classId, const void *pvData, size_t cbData);
int write(const void *data, size_t size);
void writeUnsignedInteger(uint64_t value, size_t size = sizeof(uint64_t));
void writeClassId(EbmlClassId parm);
void writeSize(uint64_t parm);
static inline size_t getSizeOfUInt(uint64_t arg);
private:
void operator=(const EBMLWriter &);
};
#endif /* !MAIN_INCLUDED_EBMLWriter_h */
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