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/** @file
* IPRT - Base64, MIME content transfer encoding.
*/
/*
* Copyright (C) 2009-2025 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_base64_h
#define IPRT_INCLUDED_base64_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/types.h>
RT_C_DECLS_BEGIN
/** @defgroup grp_rt_base64 RTBase64 - Base64, MIME content transfer encoding.
* @ingroup grp_rt
* @{
*/
/** @def RTBASE64_EOL_SIZE
* The size of the end-of-line marker. */
#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
# define RTBASE64_EOL_SIZE (sizeof("\r\n") - 1)
#else
# define RTBASE64_EOL_SIZE (sizeof("\n") - 1)
#endif
/** @name Flags for RTBase64EncodeEx() and RTBase64EncodedLengthEx().
* @{ */
/** Insert line breaks into encoded string.
* The size of the end-of-line marker is that that of the host platform.
*/
#define RTBASE64_FLAGS_EOL_NATIVE UINT32_C(0) /**< Use native newlines. */
#define RTBASE64_FLAGS_NO_LINE_BREAKS UINT32_C(1) /**< No newlines. */
#define RTBASE64_FLAGS_EOL_LF UINT32_C(2) /**< Use UNIX-style newlines. */
#define RTBASE64_FLAGS_EOL_CRLF UINT32_C(3) /**< Use DOS-style newlines. */
#define RTBASE64_FLAGS_EOL_STYLE_MASK UINT32_C(3) /**< End-of-line style mask. */
/** @} */
/**
* Calculates the decoded data size for a Base64 encoded string.
*
* @returns The length in bytes. -1 if the encoding is bad.
*
* @param pszString The Base64 encoded string.
* @param ppszEnd If not NULL, this will point to the first char
* following the Base64 encoded text block. If
* NULL the entire string is assumed to be Base64.
*/
RTDECL(ssize_t) RTBase64DecodedSize(const char *pszString, char **ppszEnd);
/**
* Calculates the decoded data size for a Base64 encoded UTF-16 string.
*
* @returns The length in bytes. -1 if the encoding is bad.
*
* @param pwszString The Base64 encoded UTF-16 string.
* @param ppwszEnd If not NULL, this will point to the first char
* following the Base64 encoded text block. If
* NULL the entire string is assumed to be Base64.
*/
RTDECL(ssize_t) RTBase64DecodedUtf16Size(PCRTUTF16 pwszString, PRTUTF16 *ppwszEnd);
/**
* Calculates the decoded data size for a Base64 encoded string.
*
* @returns The length in bytes. -1 if the encoding is bad.
*
* @param pszString The Base64 encoded string.
* @param cchStringMax The max length to decode, use RTSTR_MAX if the
* length of @a pszString is not known and it is
* really zero terminated.
* @param ppszEnd If not NULL, this will point to the first char
* following the Base64 encoded text block. If
* NULL the entire string is assumed to be Base64.
*/
RTDECL(ssize_t) RTBase64DecodedSizeEx(const char *pszString, size_t cchStringMax, char **ppszEnd);
/**
* Calculates the decoded data size for a Base64 encoded UTF-16 string.
*
* @returns The length in bytes. -1 if the encoding is bad.
*
* @param pwszString The Base64 encoded UTF-16 string.
* @param cwcStringMax The max length to decode in RTUTF16 units, use
* RTSTR_MAX if the length of @a pwszString is not
* known and it is really zero terminated.
* @param ppwszEnd If not NULL, this will point to the first char
* following the Base64 encoded text block. If
* NULL the entire string is assumed to be Base64.
*/
RTDECL(ssize_t) RTBase64DecodedUtf16SizeEx(PCRTUTF16 pwszString, size_t cwcStringMax, PRTUTF16 *ppwszEnd);
/**
* Decodes a Base64 encoded string into the buffer supplied by the caller.
*
* @returns IPRT status code.
* @retval VERR_BUFFER_OVERFLOW if the buffer is too small. pcbActual will not
* be set, nor will ppszEnd.
* @retval VERR_INVALID_BASE64_ENCODING if the encoding is wrong.
*
* @param pszString The Base64 string. Whether the entire string or
* just the start of the string is in Base64 depends
* on whether ppszEnd is specified or not.
* @param pvData Where to store the decoded data.
* @param cbData The size of the output buffer that pvData points to.
* @param pcbActual Where to store the actual number of bytes returned.
* Optional.
* @param ppszEnd Indicates that the string may contain other stuff
* after the Base64 encoded data when not NULL. Will
* be set to point to the first char that's not part of
* the encoding. If NULL the entire string must be part
* of the Base64 encoded data.
*/
RTDECL(int) RTBase64Decode(const char *pszString, void *pvData, size_t cbData, size_t *pcbActual, char **ppszEnd);
/**
* Decodes a Base64 encoded UTF-16 string into the buffer supplied by the
* caller.
*
* @returns IPRT status code.
* @retval VERR_BUFFER_OVERFLOW if the buffer is too small. pcbActual will not
* be set, nor will ppszEnd.
* @retval VERR_INVALID_BASE64_ENCODING if the encoding is wrong.
*
* @param pwszString The Base64 UTF-16 string. Whether the entire string
* or just the start of the string is in Base64 depends
* on whether ppwszEnd is specified or not.
* @param pvData Where to store the decoded data.
* @param cbData The size of the output buffer that pvData points to.
* @param pcbActual Where to store the actual number of bytes returned.
* Optional.
* @param ppwszEnd Indicates that the string may contain other stuff
* after the Base64 encoded data when not NULL. Will
* be set to point to the first char that's not part of
* the encoding. If NULL the entire string must be part
* of the Base64 encoded data.
*/
RTDECL(int) RTBase64DecodeUtf16(PCRTUTF16 pwszString, void *pvData, size_t cbData, size_t *pcbActual, PRTUTF16 *ppwszEnd);
/**
* Decodes a Base64 encoded string into the buffer supplied by the caller.
*
* @returns IPRT status code.
* @retval VERR_BUFFER_OVERFLOW if the buffer is too small. pcbActual will not
* be set, nor will ppszEnd.
* @retval VERR_INVALID_BASE64_ENCODING if the encoding is wrong.
*
* @param pszString The Base64 string. Whether the entire string or
* just the start of the string is in Base64 depends
* on whether ppszEnd is specified or not.
* @param cchStringMax The max length to decode, use RTSTR_MAX if the
* length of @a pszString is not known and it is
* really zero terminated.
* @param pvData Where to store the decoded data.
* @param cbData The size of the output buffer that pvData points to.
* @param pcbActual Where to store the actual number of bytes returned.
* Optional.
* @param ppszEnd Indicates that the string may contain other stuff
* after the Base64 encoded data when not NULL. Will
* be set to point to the first char that's not part of
* the encoding. If NULL the entire string must be part
* of the Base64 encoded data.
*/
RTDECL(int) RTBase64DecodeEx(const char *pszString, size_t cchStringMax, void *pvData, size_t cbData,
size_t *pcbActual, char **ppszEnd);
/**
* Decodes a Base64 encoded UTF-16 string into the buffer supplied by the
* caller.
*
* @returns IPRT status code.
* @retval VERR_BUFFER_OVERFLOW if the buffer is too small. pcbActual will not
* be set, nor will ppszEnd.
* @retval VERR_INVALID_BASE64_ENCODING if the encoding is wrong.
*
* @param pwszString The Base64 UTF-16 string. Whether the entire string
* or just the start of the string is in Base64 depends
* on whether ppszEnd is specified or not.
* @param cwcStringMax The max length to decode in RTUTF16 units, use
* RTSTR_MAX if the length of @a pwszString is not
* known and it is really zero terminated.
* @param pvData Where to store the decoded data.
* @param cbData The size of the output buffer that pvData points to.
* @param pcbActual Where to store the actual number of bytes returned.
* Optional.
* @param ppwszEnd Indicates that the string may contain other stuff
* after the Base64 encoded data when not NULL. Will
* be set to point to the first char that's not part of
* the encoding. If NULL the entire string must be part
* of the Base64 encoded data.
*/
RTDECL(int) RTBase64DecodeUtf16Ex(PCRTUTF16 pwszString, size_t cwcStringMax, void *pvData, size_t cbData,
size_t *pcbActual, PRTUTF16 *ppwszEnd);
/**
* Calculates the length of the Base64 encoding of a given number of bytes of
* data produced by RTBase64Encode().
*
* @returns The Base64 string length, excluding the terminator.
* @param cbData The number of bytes to encode.
*/
RTDECL(size_t) RTBase64EncodedLength(size_t cbData);
/**
* Calculates the UTF-16 length of the Base64 encoding of a given number of
* bytes of data produced by RTBase64EncodeUtf16().
*
* @returns The Base64 UTF-16 string length (in RTUTF16 units), excluding the
* terminator.
* @param cbData The number of bytes to encode.
*/
RTDECL(size_t) RTBase64EncodedUtf16Length(size_t cbData);
/**
* Calculates the length of the Base64 encoding of a given number of bytes of
* data produced by RTBase64EncodeEx() with the same @a fFlags.
*
* @returns The Base64 string length, excluding the terminator.
* @param cbData The number of bytes to encode.
* @param fFlags Flags, any combination of the RTBASE64_FLAGS \#defines.
*/
RTDECL(size_t) RTBase64EncodedLengthEx(size_t cbData, uint32_t fFlags);
/**
* Calculates the UTF-16 length of the Base64 encoding of a given number of
* bytes of data produced by RTBase64EncodeUtf16Ex() with the same @a fFlags.
*
* @returns The Base64 UTF-16 string length (in RTUTF16 units), excluding the
* terminator.
* @param cbData The number of bytes to encode.
* @param fFlags Flags, any combination of the RTBASE64_FLAGS \#defines.
*/
RTDECL(size_t) RTBase64EncodedUtf16LengthEx(size_t cbData, uint32_t fFlags);
/**
* Encodes the specifed data into a Base64 string, the caller supplies the
* output buffer.
*
* This is equivalent to calling RTBase64EncodeEx() with no flags.
*
* @returns IRPT status code.
* @retval VERR_BUFFER_OVERFLOW if the output buffer is too small. The buffer
* may contain an invalid Base64 string.
*
* @param pvData The data to encode.
* @param cbData The number of bytes to encode.
* @param pszBuf Where to put the Base64 string.
* @param cbBuf The size of the output buffer, including the terminator.
* @param pcchActual The actual number of characters returned.
*/
RTDECL(int) RTBase64Encode(const void *pvData, size_t cbData, char *pszBuf, size_t cbBuf, size_t *pcchActual);
/**
* Encodes the specifed data into a Base64 UTF-16 string, the caller supplies
* the output buffer.
*
* This is equivalent to calling RTBase64EncodeUtf16Ex() with no flags.
*
* @returns IRPT status code.
* @retval VERR_BUFFER_OVERFLOW if the output buffer is too small. The buffer
* may contain an invalid Base64 string.
*
* @param pvData The data to encode.
* @param cbData The number of bytes to encode.
* @param pwszBuf Where to put the Base64 UTF-16 string.
* @param cwcBuf The size of the output buffer in RTUTF16 units,
* including the terminator.
* @param pcwcActual The actual number of characters returned (excluding the
* terminator). Optional.
*/
RTDECL(int) RTBase64EncodeUtf16(const void *pvData, size_t cbData, PRTUTF16 pwszBuf, size_t cwcBuf, size_t *pcwcActual);
/**
* Encodes the specifed data into a Base64 string, the caller supplies the
* output buffer.
*
* @returns IRPT status code.
* @retval VERR_BUFFER_OVERFLOW if the output buffer is too small. The buffer
* may contain an invalid Base64 string.
*
* @param pvData The data to encode.
* @param cbData The number of bytes to encode.
* @param fFlags Flags, any combination of the RTBASE64_FLAGS \#defines.
* @param pszBuf Where to put the Base64 string.
* @param cbBuf The size of the output buffer, including the terminator.
* @param pcchActual The actual number of characters returned (excluding the
* terminator). Optional.
*/
RTDECL(int) RTBase64EncodeEx(const void *pvData, size_t cbData, uint32_t fFlags,
char *pszBuf, size_t cbBuf, size_t *pcchActual);
/**
* Encodes the specifed data into a Base64 UTF-16 string, the caller supplies
* the output buffer.
*
* @returns IRPT status code.
* @retval VERR_BUFFER_OVERFLOW if the output buffer is too small. The buffer
* may contain an invalid Base64 string.
*
* @param pvData The data to encode.
* @param cbData The number of bytes to encode.
* @param fFlags Flags, any combination of the RTBASE64_FLAGS \#defines.
* @param pwszBuf Where to put the Base64 UTF-16 string.
* @param cwcBuf The size of the output buffer in RTUTF16 units,
* including the terminator.
* @param pcwcActual The actual number of characters returned (excluding the
* terminator). Optional.
*/
RTDECL(int) RTBase64EncodeUtf16Ex(const void *pvData, size_t cbData, uint32_t fFlags,
PRTUTF16 pwszBuf, size_t cwcBuf, size_t *pcwcActual);
/** @} */
RT_C_DECLS_END
#endif /* !IPRT_INCLUDED_base64_h */
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