| 1 | /* $Id: base64.h 84294 2020-05-13 16:25:00Z 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) 2009-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.215389.xyz. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Defined Constants And Macros *
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| 30 | *********************************************************************************************************************************/
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| 31 | /** The line length used for encoding. */
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| 32 | #define RTBASE64_LINE_LEN 64
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| 33 |
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| 34 | /** @name Special g_au8RTBase64CharToVal values
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| 35 | * @{ */
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| 36 | #define BASE64_SPACE 0xc0
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| 37 | #define BASE64_PAD 0xe0
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| 38 | #define BASE64_INVALID 0xff
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| 39 | /** @} */
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| 40 |
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| 41 |
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| 42 | /*********************************************************************************************************************************
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| 43 | * Global Variables *
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| 44 | *********************************************************************************************************************************/
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| 45 | extern DECLHIDDEN(const uint8_t) g_au8RTBase64CharToVal[256];
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| 46 | extern DECLHIDDEN(const char) g_szRTBase64ValToChar[64+1];
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| 47 | extern DECLHIDDEN(const size_t) g_acchRTBase64EolStyles[RTBASE64_FLAGS_EOL_STYLE_MASK + 1];
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| 48 | extern DECLHIDDEN(const char) g_aachRTBase64EolStyles[RTBASE64_FLAGS_EOL_STYLE_MASK + 1][2];
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| 49 |
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| 50 |
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| 51 | /*********************************************************************************************************************************
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| 52 | * Internal Functions *
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| 53 | *********************************************************************************************************************************/
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| 54 | #ifdef RT_STRICT
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| 55 | DECLHIDDEN(void) rtBase64Sanity(void);
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| 56 | #endif
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| 57 |
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| 58 |
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| 59 | /**
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| 60 | * Recalcs 6-bit to 8-bit and adjust for padding.
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| 61 | */
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| 62 | DECLINLINE(ssize_t) rtBase64DecodedSizeRecalc(uint32_t c6Bits, unsigned cbPad)
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| 63 | {
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| 64 | size_t cb;
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| 65 | if (c6Bits * 3 / 3 == c6Bits)
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| 66 | {
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| 67 | if ((c6Bits * 3 % 4) != 0)
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| 68 | return -1;
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| 69 | cb = c6Bits * 3 / 4;
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| 70 | }
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| 71 | else
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| 72 | {
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| 73 | if ((c6Bits * (uint64_t)3 % 4) != 0)
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| 74 | return -1;
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| 75 | cb = c6Bits * (uint64_t)3 / 4;
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| 76 | }
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| 77 |
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| 78 | if (cb < cbPad)
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| 79 | return -1;
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| 80 | cb -= cbPad;
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| 81 | return cb;
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| 82 | }
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| 83 |
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