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Diffstat (limited to '')
| -rw-r--r-- | include/iprt/base64.h | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/include/iprt/base64.h b/include/iprt/base64.h new file mode 100644 index 00000000..c9d28ab7 --- /dev/null +++ b/include/iprt/base64.h @@ -0,0 +1,197 @@ +/** @file + * IPRT - Base64, MIME content transfer encoding. + */ + +/* + * Copyright (C) 2009-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + +#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_NO_LINE_BREAKS RT_BIT_32(0) +/** @} */ + + +/** + * 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 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); + +/** + * 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 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); + + +/** + * Calculates the length of the Base64 encoding of a given number of bytes of + * data produced by RTBase64Encode(). + * + * @returns The Base64 string length. + * @param cbData The number of bytes to encode. + */ +RTDECL(size_t) RTBase64EncodedLength(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. + * @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); + +/** + * 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 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. + */ +RTDECL(int) RTBase64EncodeEx(const void *pvData, size_t cbData, uint32_t fFlags, + char *pszBuf, size_t cbBuf, size_t *pcchActual); + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_base64_h */ + |