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/* $Id: base64.h $ */
/** @file
* IPRT - Base64, MIME content transfer encoding, internal header.
*/
/*
* Copyright (C) 2009-2023 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>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_SRC_common_string_base64_h
#define IPRT_INCLUDED_SRC_common_string_base64_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
/** The line length used for encoding. */
#define RTBASE64_LINE_LEN 64
/** @name Special g_au8rtBase64CharToVal values
* @{ */
#define BASE64_SPACE 0xc0
#define BASE64_PAD 0xe0
#define BASE64_NULL 0xfe
#define BASE64_INVALID 0xff
/** @} */
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
extern DECL_HIDDEN_DATA(const uint8_t) g_au8rtBase64CharToVal[256];
extern DECL_HIDDEN_DATA(const char) g_szrtBase64ValToChar[64+1];
extern DECL_HIDDEN_DATA(const size_t) g_acchrtBase64EolStyles[RTBASE64_FLAGS_EOL_STYLE_MASK + 1];
extern DECL_HIDDEN_DATA(const char) g_aachrtBase64EolStyles[RTBASE64_FLAGS_EOL_STYLE_MASK + 1][2];
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
#ifdef RT_STRICT
DECLHIDDEN(void) rtBase64Sanity(void);
#endif
/**
* Recalcs 6-bit to 8-bit and adjust for padding.
*/
DECLINLINE(ssize_t) rtBase64DecodedSizeRecalc(uint32_t c6Bits, unsigned cbPad)
{
size_t cb;
if (c6Bits * 3 / 3 == c6Bits)
{
if ((c6Bits * 3 % 4) != 0)
return -1;
cb = c6Bits * 3 / 4;
}
else
{
if ((c6Bits * (uint64_t)3 % 4) != 0)
return -1;
cb = c6Bits * (uint64_t)3 / 4;
}
if (cb < cbPad)
return -1;
cb -= cbPad;
return cb;
}
#endif /* !IPRT_INCLUDED_SRC_common_string_base64_h */
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