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Edit File : apr_encode.h \| Size : 30.35 KB
/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. / /* * @file apr_encode.h * @brief APR-UTIL Encoding / #ifndef APR_ENCODE_H #define APR_ENCODE_H #include "apr.h" #include "apr_general.h" #ifdef __cplusplus extern "C" { #endif /* * @defgroup APR_Util_Encode Base64/Base64Url/Base32/Base32Hex/Base16 Encoding * @ingroup APR_Util * @{ / /* * RFC4648 and RFC7515 compliant BASE64, BASE64URL, BASE32, BASE32HEX * and BASE16 encode/decode functions. * * The following encodings are supported: * * - Base 64 Encoding * * o Use flag APR_ENCODE_NONE * o https://tools.ietf.org/html/rfc4648#section-4 * * - Base 64 Encoding with URL and Filename Safe Alphabet * * o Use flag APR_ENCODE_URL * o https://tools.ietf.org/html/rfc4648#section-5 * * - Base 64 URL Encoding without Padding * * o Use flag APR_ENCODE_BASE64URL * o https://tools.ietf.org/html/rfc7515#appendix-C * * - Base 32 Encoding * * o Use flag APR_ENCODE_NONE * o https://tools.ietf.org/html/rfc4648#section-6 * * - Base 32 Encoding with Extended Hex Alphabet * * o Use flag APR_ENCODE_BASE32HEX * o https://tools.ietf.org/html/rfc4648#section-7 * * - Base 16 Encoding * * o Use flags APR_ENCODE_NONE/APR_ENCODE_COLON * o https://tools.ietf.org/html/rfc4648#section-8 * * If a non valid character of any kind including whitespace is passed to any * of the decoder functions, APR_BADCH will be returned. In this case decoding * will still take place, but the results can not be trusted. * * If APR_ENCODE_RELAXED is passed to the decoder functions, decoding will be * attempted up until the first non valid character. If this results in an * invalid state in the decoder, such as but not limited to an odd number of * base16 characters, APR_BADCH will still be returned. * * If APR_ENCODE_RELAXED is not passed to a decoder function, the decoding will * be done in constant time regardless of whether the result returns APR_SUCCESS * or APR_BADCH. * * If the dest parameter is NULL, the maximum theoretical buffer size is * returned in the len field, including space for a terminating zero character * if the destination is a string. This value can be used to allocate buffers * of a suitable safe size. * * If the dest parameter is provided, the encoding or decoding will take place, * and the actual number of characters written is returned in the len field, * ignoring any terminating zero. * * Plain strings are not assumed '\0' terminated unless APR_ENCODE_STRING is * provided. * / /* * When passing a string to one of the encode functions, this value can be * passed to indicate a string-valued key, and have the length computed * automatically. / #define APR_ENCODE_STRING (-1) /* * Generate RFC4648 base16/base32/base64. / #define APR_ENCODE_NONE 0 /* * If relaxed, decode up until the first non base16/base32/base64 character. / #define APR_ENCODE_RELAXED 1 /* * Omit the padding character (=) while encoding. / #define APR_ENCODE_NOPADDING 2 /* * Generate RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet / #define APR_ENCODE_URL 4 /* * Generate RFC7515 BASE64URL / #define APR_ENCODE_BASE64URL (APR_ENCODE_NOPADDING \| APR_ENCODE_URL) /* * Generate base32hex encoding instead of base32 encoding / #define APR_ENCODE_BASE32HEX 8 /* * Generate base16 with colons between each token. / #define APR_ENCODE_COLON 16 /* * Generate base16 with lower case characters. / #define APR_ENCODE_LOWER 32 /* * Convert text data to base64. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for encoding. * @param src The original string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_URL, * use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet. * If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding. * @param len If not NULL, outputs the length of the buffer needed for encoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the encoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to encode. / APR_DECLARE(apr_status_t) apr_encode_base64(char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert binary data to base64. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for encoding. * @param src The original buffer, can be NULL if \c dest is NULL. * @param slen The length of the original buffer. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_URL, * use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet. * If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding. * @param len If not NULL, outputs the length of the buffer needed for encoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the encoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is negative, or APR_NOTFOUND * if \c dest is not NULL and \c src is NULL, or APR_ENOSPC if \c dest is NULL * and the source length (based on \c slen or APR_ENCODE_STRING) is too big to * encode. / APR_DECLARE(apr_status_t) apr_encode_base64_binary(char dest, const unsigned char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert text data to base64, and return the results from a pool. * @param p Pool to allocate from. * @param src The original string. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_URL, * use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet. * If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the encoding is not * possible (see apr_encode_base64 errors). / APR_DECLARE(const char )apr_pencode_base64(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len)__attribute__((nonnull(1))); /** * Convert binary data to base64, and return the results from a pool. * @param p Pool to allocate from. * @param src The original buffer. * @param slen The length of the original buffer. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_URL, * use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet. * If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the encoding is not * possible (see apr_encode_base64_binary errors). / APR_DECLARE(const char )apr_pencode_base64_binary(apr_pool_t * p, const unsigned char src, apr_ssize_t slen, int flags, apr_size_t len)__attribute__((nonnull(1))); /** * Convert base64 or base64url with or without padding to text data. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for decoding. * @param src The base64 string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the base64 string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, attempt to decode the full base64 string, * and return NULL if any bad character is detected. If APR_ENCODE_RELAXED, * decode until the first non base64/base64url character. * @param len If not NULL, outputs the length of the buffer needed for decoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the decoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source * length (based on \c slen or APR_ENCODE_STRING) is invalid for a base64 * encoding, or APR_BADCH if a non base64 character is present and * APR_ENCODE_RELAXED is not specified. / APR_DECLARE(apr_status_t) apr_decode_base64(char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert base64 or base64url with or without padding to binary data. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for decoding. * @param src The base64 string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the base64 string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, attempt to decode the full base64 string, * and return NULL if any bad character is detected. If APR_ENCODE_RELAXED, * decode until the first non base64/base64url character. * @param len If not NULL, outputs the length of the buffer needed for decoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the decoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source * length (based on \c slen or APR_ENCODE_STRING) is invalid for a base64 * encoding, or APR_BADCH if a non base64 character is present and * APR_ENCODE_RELAXED is not specified. / APR_DECLARE(apr_status_t) apr_decode_base64_binary(unsigned char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert base64 or base64url with or without padding to text data, and * return the results from a pool. * @param p Pool to allocate from. * @param src The base64 string to decode. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, attempt to decode the full original buffer, * and return NULL if any bad character is detected. If APR_ENCODE_RELAXED, * decode until the first non base64/base64url character. * @param len If not NULL, outputs the length of the decoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the decoding is not * possible (see apr_decode_base64_binary errors). / APR_DECLARE(const char )apr_pdecode_base64(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert base64 or base64url with or without padding to binary data, and * return the results from a pool. * @param p Pool to allocate from. * @param src The base64 string to decode. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, attempt to decode the full original buffer, * and return NULL if any bad character is detected. If APR_ENCODE_RELAXED, * decode until the first non base64/base64url character. * @param len If not NULL, outputs the length of the decoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the decoding is not * possible (see apr_decode_base64_binary errors). / APR_DECLARE(const unsigned char )apr_pdecode_base64_binary(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert text data to base32. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for encoding. * @param src The original string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_BASE32HEX, * use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the buffer needed for encoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the encoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to encode. / APR_DECLARE(apr_status_t) apr_encode_base32(char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert binary data to base32. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for encoding. * @param src The original buffer, can be NULL if \c dest is NULL. * @param slen The length of the original buffer. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_BASE32HEX, * use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the buffer needed for encoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the encoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is negative, or APR_NOTFOUND * if \c dest is not NULL and \c src is NULL, or APR_ENOSPC if \c dest is NULL * and the source length (based on \c slen or APR_ENCODE_STRING) is too big to * encode. / APR_DECLARE(apr_status_t) apr_encode_base32_binary(char dest, const unsigned char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert text data to base32, and return the results from a pool. * @param p Pool to allocate from. * @param src The original string. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_BASE32HEX, * use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the encoding is not * possible (see apr_encode_base32 errors). / APR_DECLARE(const char )apr_pencode_base32(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert binary data to base32, and return the results from a pool. * @param p Pool to allocate from. * @param src The original buffer. * @param slen The length of the original buffer. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If * APR_ENCODE_NOPADDING, omit the = padding character. If APR_ENCODE_BASE32HEX, * use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the encoding is not * possible (see apr_encode_base32_binary errors). / APR_DECLARE(const char )apr_pencode_base32_binary(apr_pool_t * p, const unsigned char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert base32 or base32hex with or without padding to text data. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for decoding. * @param src The base32 string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the base32 string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If * APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the buffer needed for decoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the decoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source * length (based on \c slen or APR_ENCODE_STRING) is invalid for a base32 * encoding, or APR_BADCH if a non base32 character is present and * APR_ENCODE_RELAXED is not specified. / APR_DECLARE(apr_status_t) apr_decode_base32(char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert base32 or base32hex with or without padding to binary data. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for decoding. * @param src The base32 string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the base32 string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If * APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the buffer needed for decoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the decoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source * length (based on \c slen or APR_ENCODE_STRING) is invalid for a base32 * encoding, or APR_BADCH if a non base32 character is present and * APR_ENCODE_RELAXED is not specified. / APR_DECLARE(apr_status_t) apr_decode_base32_binary(unsigned char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert base32 or base32hex with or without padding to text data, and * return the results from a pool. * @param p Pool to allocate from. * @param src The base32 string to decode. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If * APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the decoding is not * possible (see apr_decode_base32 errors). / APR_DECLARE(const char )apr_pdecode_base32(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert base32 or base32hex with or without padding to binary data, and * return the results from a pool. * @param p Pool to allocate from. * @param src The base32 string to decode. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If * APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the decoding is not * possible (see apr_decode_base32_binary errors). / APR_DECLARE(const unsigned char )apr_pdecode_base32_binary(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert text data to base16 (hex). * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for encoding. * @param src The original string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, separate each token with a colon. * @param len If not NULL, outputs the length of the buffer needed for encoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the encoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to encode. / APR_DECLARE(apr_status_t) apr_encode_base16(char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert binary data to base16 (hex). * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for encoding. * @param src The original buffer, can be NULL if \c dest is NULL. * @param slen The length of the original buffer. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, separate each token with a colon. * @param len If not NULL, outputs the length of the buffer needed for encoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the encoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is negative, or APR_NOTFOUND * if \c dest is not NULL and \c src is NULL, or APR_ENOSPC if \c dest is NULL * and the source length (based on \c slen or APR_ENCODE_STRING) is too big to * encode. / APR_DECLARE(apr_status_t) apr_encode_base16_binary(char dest, const unsigned char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert text data to base16 (hex), and return the results from a * pool. * @param p Pool to allocate from. * @param src The original string. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, separate each token with a colon. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the encoding is not * possible (see apr_encode_base16 errors). / APR_DECLARE(const char )apr_pencode_base16(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert binary data to base16 (hex), and return the results from a * pool. * @param p Pool to allocate from. * @param src The original buffer. * @param slen The length of the original buffer. * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, separate each token with a colon. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the encoding is not * possible (see apr_encode_base16_binary errors). / APR_DECLARE(const char )apr_pencode_base16_binary(apr_pool_t * p, const unsigned char src, apr_ssize_t slen, int flags, apr_size_t len)__attribute__((nonnull(1))); /** * Convert base16 (hex) to text data. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for decoding. * @param src The base16 string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the base16 string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, allow tokens to be separated with a colon. * @param len If not NULL, outputs the length of the buffer needed for decoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the decoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source * length (based on \c slen or APR_ENCODE_STRING) is invalid for a base16 * encoding, or APR_BADCH if a non base16 character is present and * APR_ENCODE_RELAXED is not specified. / APR_DECLARE(apr_status_t) apr_decode_base16(char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert base16 (hex) to binary data. * @param dest The destination string, can be NULL to output in \c len the * needed buffer length for decoding. * @param src The base16 string, can be NULL if \c dest is NULL and \c slen * is positive or nul. * @param slen The length of the base16 string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, allow tokens to be separated with a colon. * @param len If not NULL, outputs the length of the buffer needed for decoding * (including the trailing NUL) if \c dest is NULL, or the actual length of * the decoding (excluding the trailing NUL) if \c dest is not NULL. * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and * negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or * APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or * APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source * length (based on \c slen or APR_ENCODE_STRING) is invalid for a base16 * encoding, or APR_BADCH if a non base16 character is present and * APR_ENCODE_RELAXED is not specified. / APR_DECLARE(apr_status_t) apr_decode_base16_binary(unsigned char dest, const char src, apr_ssize_t slen, int flags, apr_size_t len); /** * Convert base16 (hex) and return the results from a pool. * @param p Pool to allocate from. * @param src The base16 string to decode. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, allow tokens to be separated with a colon. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the decoding is not * possible (see apr_decode_base16 errors). / APR_DECLARE(const char )apr_pdecode_base16(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** * Convert base16 (hex) to binary data, and return the results from a pool. * @param p Pool to allocate from. * @param src The base16 string to decode. * @param slen The length of the original string, or APR_ENCODE_STRING if * the actual length should be computed based on NUL termination. * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If * APR_ENCODE_COLON, allow tokens to be separated with a colon. * @param len If not NULL, outputs the length of the encoding (excluding the * trailing NUL). * @return A NUL terminated string allocated from the pool on success, * or NULL if src is NULL or allocation failed or the decoding is not * possible (see apr_decode_base16_binary errors). / APR_DECLARE(const unsigned char )apr_pdecode_base16_binary(apr_pool_t * p, const char src, apr_ssize_t slen, int flags, apr_size_t len) __attribute__((nonnull(1))); /** @} / #ifdef __cplusplus } #endif #endif / !APR_ENCODE_H */ Back

Edit File : apr_encode.h | Size : 30.35 KB

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file apr_encode.h
 * @brief APR-UTIL Encoding
 */
#ifndef APR_ENCODE_H
#define APR_ENCODE_H

#include "apr.h"
#include "apr_general.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup APR_Util_Encode Base64/Base64Url/Base32/Base32Hex/Base16 Encoding
 * @ingroup APR_Util
 * @{
 */

/**
 * RFC4648 and RFC7515 compliant BASE64, BASE64URL, BASE32, BASE32HEX
 * and BASE16 encode/decode functions.
 *
 * The following encodings are supported:
 *
 * - Base 64 Encoding
 *
 *   o Use flag APR_ENCODE_NONE
 *   o https://tools.ietf.org/html/rfc4648#section-4
 *
 * - Base 64 Encoding with URL and Filename Safe Alphabet
 *
 *   o Use flag APR_ENCODE_URL
 *   o https://tools.ietf.org/html/rfc4648#section-5
 *
 * - Base 64 URL Encoding without Padding
 *
 *   o Use flag APR_ENCODE_BASE64URL
 *   o https://tools.ietf.org/html/rfc7515#appendix-C
 *
 * - Base 32 Encoding
 *
 *   o Use flag APR_ENCODE_NONE
 *   o https://tools.ietf.org/html/rfc4648#section-6
 *
 * - Base 32 Encoding with Extended Hex Alphabet
 *
 *   o Use flag APR_ENCODE_BASE32HEX
 *   o https://tools.ietf.org/html/rfc4648#section-7
 *
 * - Base 16 Encoding
 *
 *   o Use flags APR_ENCODE_NONE/APR_ENCODE_COLON
 *   o https://tools.ietf.org/html/rfc4648#section-8
 *
 * If a non valid character of any kind including whitespace is passed to any
 * of the decoder functions, APR_BADCH will be returned. In this case decoding
 * will still take place, but the results can not be trusted.
 *
 * If APR_ENCODE_RELAXED is passed to the decoder functions, decoding will be
 * attempted up until the first non valid character. If this results in an
 * invalid state in the decoder, such as but not limited to an odd number of
 * base16 characters, APR_BADCH will still be returned.
 *
 * If APR_ENCODE_RELAXED is not passed to a decoder function, the decoding will
 * be done in constant time regardless of whether the result returns APR_SUCCESS
 * or APR_BADCH.
 *
 * If the dest parameter is NULL, the maximum theoretical buffer size is
 * returned in the len field, including space for a terminating zero character
 * if the destination is a string. This value can be used to allocate buffers
 * of a suitable safe size.
 *
 * If the dest parameter is provided, the encoding or decoding will take place,
 * and the actual number of characters written is returned in the len field,
 * ignoring any terminating zero.
 *
 * Plain strings are not assumed '\0' terminated unless APR_ENCODE_STRING is
 * provided.
 *
 */

/**
 * When passing a string to one of the encode functions, this value can be
 * passed to indicate a string-valued key, and have the length computed
 * automatically.
 */
#define APR_ENCODE_STRING      (-1)

/**
 * Generate RFC4648 base16/base32/base64.
 */
#define APR_ENCODE_NONE 0

/**
 * If relaxed, decode up until the first non base16/base32/base64 character.
 */
#define APR_ENCODE_RELAXED 1

/**
 * Omit the padding character (=) while encoding.
 */
#define APR_ENCODE_NOPADDING 2

/**
 * Generate RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet
 */
#define APR_ENCODE_URL 4

/**
 * Generate RFC7515 BASE64URL
 */
#define APR_ENCODE_BASE64URL (APR_ENCODE_NOPADDING | APR_ENCODE_URL)

/**
 * Generate base32hex encoding instead of base32 encoding
 */
#define APR_ENCODE_BASE32HEX 8

/**
 * Generate base16 with colons between each token.
 */
#define APR_ENCODE_COLON 16

/**
 * Generate base16 with lower case characters.
 */
#define APR_ENCODE_LOWER 32

/**
 * Convert text data to base64.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for encoding.
 * @param src The original string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_URL,
 *  use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet.
 *  If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding.
 * @param len If not NULL, outputs the length of the buffer needed for encoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the encoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to encode.
 */
APR_DECLARE(apr_status_t) apr_encode_base64(char *dest, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert binary data to base64.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for encoding.
 * @param src The original buffer, can be NULL if \c dest is NULL.
 * @param slen The length of the original buffer.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_URL,
 *  use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet.
 *  If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding.
 * @param len If not NULL, outputs the length of the buffer needed for encoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the encoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is negative, or APR_NOTFOUND
 *  if \c dest is not NULL and \c src is NULL, or APR_ENOSPC if \c dest is NULL
 *  and the source length (based on \c slen or APR_ENCODE_STRING) is too big to
 *  encode.
 */
APR_DECLARE(apr_status_t) apr_encode_base64_binary(char *dest, const unsigned char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert text data to base64, and return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The original string.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_URL,
 *  use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet.
 *  If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the encoding is not
 *  possible (see apr_encode_base64 errors).
 */
APR_DECLARE(const char *)apr_pencode_base64(apr_pool_t * p, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)__attribute__((nonnull(1)));

/**
 * Convert binary data to base64, and return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The original buffer.
 * @param slen The length of the original buffer.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 64 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_URL,
 *  use RFC4648 Base 64 Encoding with URL and Filename Safe Alphabet.
 *  If APR_ENCODE_BASE64URL, use RFC7515 base64url Encoding.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the encoding is not
 *  possible (see apr_encode_base64_binary errors).
 */
APR_DECLARE(const char *)apr_pencode_base64_binary(apr_pool_t * p, const unsigned char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)__attribute__((nonnull(1)));

/**
 * Convert base64 or base64url with or without padding to text data.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for decoding.
 * @param src The base64 string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the base64 string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, attempt to decode the full base64 string,
 *  and return NULL if any bad character is detected. If APR_ENCODE_RELAXED,
 *  decode until the first non base64/base64url character.
 * @param len If not NULL, outputs the length of the buffer needed for decoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the decoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source
 *  length (based on \c slen or APR_ENCODE_STRING) is invalid for a base64
 *  encoding, or APR_BADCH if a non base64 character is present and
 *  APR_ENCODE_RELAXED is not specified.
 */
APR_DECLARE(apr_status_t) apr_decode_base64(char *dest, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert base64 or base64url with or without padding to binary data.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for decoding.
 * @param src The base64 string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the base64 string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, attempt to decode the full base64 string,
 *  and return NULL if any bad character is detected. If APR_ENCODE_RELAXED,
 *  decode until the first non base64/base64url character.
 * @param len If not NULL, outputs the length of the buffer needed for decoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the decoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source
 *  length (based on \c slen or APR_ENCODE_STRING) is invalid for a base64
 *  encoding, or APR_BADCH if a non base64 character is present and
 *  APR_ENCODE_RELAXED is not specified.
 */
APR_DECLARE(apr_status_t) apr_decode_base64_binary(unsigned char *dest,
        const char *src, apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert base64 or base64url with or without padding to text data, and
 * return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The base64 string to decode.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, attempt to decode the full original buffer,
 *  and return NULL if any bad character is detected. If APR_ENCODE_RELAXED,
 *  decode until the first non base64/base64url character.
 * @param len If not NULL, outputs the length of the decoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the decoding is not
 *  possible (see apr_decode_base64_binary errors).
 */
APR_DECLARE(const char *)apr_pdecode_base64(apr_pool_t * p, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert base64 or base64url with or without padding to binary data, and
 * return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The base64 string to decode.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, attempt to decode the full original buffer,
 *  and return NULL if any bad character is detected. If APR_ENCODE_RELAXED,
 *  decode until the first non base64/base64url character.
 * @param len If not NULL, outputs the length of the decoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the decoding is not
 *  possible (see apr_decode_base64_binary errors).
 */
APR_DECLARE(const unsigned char *)apr_pdecode_base64_binary(apr_pool_t * p,
        const char *src, apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert text data to base32.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for encoding.
 * @param src The original string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_BASE32HEX,
 *  use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the buffer needed for encoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the encoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to encode.
 */
APR_DECLARE(apr_status_t) apr_encode_base32(char *dest, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert binary data to base32.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for encoding.
 * @param src The original buffer, can be NULL if \c dest is NULL.
 * @param slen The length of the original buffer.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_BASE32HEX,
 *  use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the buffer needed for encoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the encoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is negative, or APR_NOTFOUND
 *  if \c dest is not NULL and \c src is NULL, or APR_ENOSPC if \c dest is NULL
 *  and the source length (based on \c slen or APR_ENCODE_STRING) is too big to
 *  encode.
 */
APR_DECLARE(apr_status_t) apr_encode_base32_binary(char *dest, const unsigned char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert text data to base32, and return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The original string.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_BASE32HEX,
 *  use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the encoding is not
 *  possible (see apr_encode_base32 errors).
 */
APR_DECLARE(const char *)apr_pencode_base32(apr_pool_t * p, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert binary data to base32, and return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The original buffer.
 * @param slen The length of the original buffer.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_NOPADDING, omit the = padding character.	If APR_ENCODE_BASE32HEX,
 *  use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the encoding is not
 *  possible (see apr_encode_base32_binary errors).
 */
APR_DECLARE(const char *)apr_pencode_base32_binary(apr_pool_t * p, const unsigned char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert base32 or base32hex with or without padding to text data.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for decoding.
 * @param src The base32 string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the base32 string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the buffer needed for decoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the decoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source
 *  length (based on \c slen or APR_ENCODE_STRING) is invalid for a base32
 *  encoding, or APR_BADCH if a non base32 character is present and
 *  APR_ENCODE_RELAXED is not specified.
 */
APR_DECLARE(apr_status_t) apr_decode_base32(char *dest, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert base32 or base32hex with or without padding to binary data.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for decoding.
 * @param src The base32 string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the base32 string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the buffer needed for decoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the decoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source
 *  length (based on \c slen or APR_ENCODE_STRING) is invalid for a base32
 *  encoding, or APR_BADCH if a non base32 character is present and
 *  APR_ENCODE_RELAXED is not specified.
 */
APR_DECLARE(apr_status_t) apr_decode_base32_binary(unsigned char *dest,
        const char *src, apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert base32 or base32hex with or without padding to text data, and
 * return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The base32 string to decode.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the decoding is not
 *  possible (see apr_decode_base32 errors).
 */
APR_DECLARE(const char *)apr_pdecode_base32(apr_pool_t * p, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert base32 or base32hex with or without padding to binary data, and
 * return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The base32 string to decode.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 32 Encoding. If
 *  APR_ENCODE_BASE32HEX, use RFC4648 base32hex Encoding.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the decoding is not
 *  possible (see apr_decode_base32_binary errors).
 */
APR_DECLARE(const unsigned char *)apr_pdecode_base32_binary(apr_pool_t * p,
        const char *src, apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert text data to base16 (hex).
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for encoding.
 * @param src The original string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, separate each token with a colon.
 * @param len If not NULL, outputs the length of the buffer needed for encoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the encoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to encode.
 */
APR_DECLARE(apr_status_t) apr_encode_base16(char *dest, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert binary data to base16 (hex).
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for encoding.
 * @param src The original buffer, can be NULL if \c dest is NULL.
 * @param slen The length of the original buffer.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, separate each token with a colon.
 * @param len If not NULL, outputs the length of the buffer needed for encoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the encoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is negative, or APR_NOTFOUND
 *  if \c dest is not NULL and \c src is NULL, or APR_ENOSPC if \c dest is NULL
 *  and the source length (based on \c slen or APR_ENCODE_STRING) is too big to
 *  encode.
 */
APR_DECLARE(apr_status_t) apr_encode_base16_binary(char *dest,
        const unsigned char *src, apr_ssize_t slen, int flags,
        apr_size_t * len);

/**
 * Convert text data to base16 (hex), and return the results from a
 * pool.
 * @param p Pool to allocate from.
 * @param src The original string.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, separate each token with a colon.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the encoding is not
 *  possible (see apr_encode_base16 errors).
 */
APR_DECLARE(const char *)apr_pencode_base16(apr_pool_t * p, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert binary data to base16 (hex), and return the results from a
 * pool.
 * @param p Pool to allocate from.
 * @param src The original buffer.
 * @param slen The length of the original buffer.
 * @param flags If APR_ENCODE_NONE, emit RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, separate each token with a colon.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the encoding is not
 *  possible (see apr_encode_base16_binary errors).
 */
APR_DECLARE(const char *)apr_pencode_base16_binary(apr_pool_t * p,
        const unsigned char *src, apr_ssize_t slen,
        int flags, apr_size_t * len)__attribute__((nonnull(1)));

/**
 * Convert base16 (hex) to text data.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for decoding.
 * @param src The base16 string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the base16 string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, allow tokens to be separated with a colon.
 * @param len If not NULL, outputs the length of the buffer needed for decoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the decoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source
 *  length (based on \c slen or APR_ENCODE_STRING) is invalid for a base16
 *  encoding, or APR_BADCH if a non base16 character is present and
 *  APR_ENCODE_RELAXED is not specified.
 */
APR_DECLARE(apr_status_t) apr_decode_base16(char *dest, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert base16 (hex) to binary data.
 * @param dest The destination string, can be NULL to output in \c len the
 *  needed buffer length for decoding.
 * @param src The base16 string, can be NULL if \c dest is NULL and \c slen
 *  is positive or nul.
 * @param slen The length of the base16 string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, allow tokens to be separated with a colon.
 * @param len If not NULL, outputs the length of the buffer needed for decoding
 *  (including the trailing NUL) if \c dest is NULL, or the actual length of
 *  the decoding (excluding the trailing NUL) if \c dest is not NULL.
 * @return APR_SUCCESS, or APR_EINVAL if \c slen is not APR_ENCODE_STRING and
 *  negative, or APR_NOTFOUND if \c dest is not NULL and \c src is NULL, or
 *  APR_ENOSPC if \c dest is NULL and the source length (based on \c slen or
 *  APR_ENCODE_STRING) is too big to decode, or APR_EINCOMPLETE if the source
 *  length (based on \c slen or APR_ENCODE_STRING) is invalid for a base16
 *  encoding, or APR_BADCH if a non base16 character is present and
 *  APR_ENCODE_RELAXED is not specified.
 */
APR_DECLARE(apr_status_t) apr_decode_base16_binary(unsigned char *dest,
        const char *src, apr_ssize_t slen, int flags, apr_size_t * len);

/**
 * Convert base16 (hex) and return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The base16 string to decode.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, allow tokens to be separated with a colon.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the decoding is not
 *  possible (see apr_decode_base16 errors).
 */
APR_DECLARE(const char *)apr_pdecode_base16(apr_pool_t * p, const char *src,
        apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/**
 * Convert base16 (hex) to binary data, and return the results from a pool.
 * @param p Pool to allocate from.
 * @param src The base16 string to decode.
 * @param slen The length of the original string, or APR_ENCODE_STRING if
 *  the actual length should be computed based on NUL termination.
 * @param flags If APR_ENCODE_NONE, parse RFC4648 Base 16 Encoding. If
 *  APR_ENCODE_COLON, allow tokens to be separated with a colon.
 * @param len If not NULL, outputs the length of the encoding (excluding the
 *  trailing NUL).
 * @return A NUL terminated string allocated from the pool on success,
 *  or NULL if src is NULL or allocation failed or the decoding is not
 *  possible (see apr_decode_base16_binary errors).
 */
APR_DECLARE(const unsigned char *)apr_pdecode_base16_binary(apr_pool_t * p,
        const char *src, apr_ssize_t slen, int flags, apr_size_t * len)
        __attribute__((nonnull(1)));

/** @} */
#ifdef __cplusplus
}
#endif

#endif                          /* !APR_ENCODE_H */

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