| 1 | /* $Id: base64.h 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Base64, MIME content transfer encoding, internal header.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 | #ifndef IPRT_INCLUDED_SRC_common_string_base64_h
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| 38 | #define IPRT_INCLUDED_SRC_common_string_base64_h
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| 39 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 40 | # pragma once
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| 41 | #endif
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| 42 |
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| 43 |
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| 44 | /*********************************************************************************************************************************
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| 45 | * Defined Constants And Macros *
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| 46 | *********************************************************************************************************************************/
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| 47 | /** The line length used for encoding. */
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| 48 | #define RTBASE64_LINE_LEN 64
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| 49 |
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| 50 | /** @name Special g_au8rtBase64CharToVal values
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| 51 | * @{ */
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| 52 | #define BASE64_SPACE 0xc0
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| 53 | #define BASE64_PAD 0xe0
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| 54 | #define BASE64_NULL 0xfe
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| 55 | #define BASE64_INVALID 0xff
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| 56 | /** @} */
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| 57 |
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| 58 |
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| 59 | /*********************************************************************************************************************************
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| 60 | * Global Variables *
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| 61 | *********************************************************************************************************************************/
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| 62 | extern DECL_HIDDEN_DATA(const uint8_t) g_au8rtBase64CharToVal[256];
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| 63 | extern DECL_HIDDEN_DATA(const char) g_szrtBase64ValToChar[64+1];
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| 64 | extern DECL_HIDDEN_DATA(const size_t) g_acchrtBase64EolStyles[RTBASE64_FLAGS_EOL_STYLE_MASK + 1];
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| 65 | extern DECL_HIDDEN_DATA(const char) g_aachrtBase64EolStyles[RTBASE64_FLAGS_EOL_STYLE_MASK + 1][2];
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| 66 |
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| 67 |
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| 68 | /*********************************************************************************************************************************
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| 69 | * Internal Functions *
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| 70 | *********************************************************************************************************************************/
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| 71 | #ifdef RT_STRICT
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| 72 | DECLHIDDEN(void) rtBase64Sanity(void);
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| 73 | #endif
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| 74 |
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| 75 |
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| 76 | /**
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| 77 | * Recalcs 6-bit to 8-bit and adjust for padding.
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| 78 | */
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| 79 | DECLINLINE(ssize_t) rtBase64DecodedSizeRecalc(uint32_t c6Bits, unsigned cbPad)
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| 80 | {
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| 81 | size_t cb;
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| 82 | if (c6Bits * 3 / 3 == c6Bits)
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| 83 | {
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| 84 | if ((c6Bits * 3 % 4) != 0)
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| 85 | return -1;
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| 86 | cb = c6Bits * 3 / 4;
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| 87 | }
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| 88 | else
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| 89 | {
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| 90 | if ((c6Bits * (uint64_t)3 % 4) != 0)
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| 91 | return -1;
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| 92 | cb = c6Bits * (uint64_t)3 / 4;
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| 93 | }
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| 94 |
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| 95 | if (cb < cbPad)
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| 96 | return -1;
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| 97 | cb -= cbPad;
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| 98 | return cb;
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| 99 | }
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| 100 |
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| 101 | #endif /* !IPRT_INCLUDED_SRC_common_string_base64_h */
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