105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
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//*********************************************************************
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//* C_Base64 - a simple base64 encoder and decoder.
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//*
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//* Copyright (c) 1999, Bob Withers - bwit@pobox.com
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//*
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//* This code may be freely used for any purpose, either personal
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//* or commercial, provided the authors copyright notice remains
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//* intact.
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//*********************************************************************
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#ifndef WEBRTC_BASE_BASE64_H__
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#define WEBRTC_BASE_BASE64_H__
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#include <string>
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#include <vector>
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namespace rtc {
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class Base64
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{
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public:
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enum DecodeOption {
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DO_PARSE_STRICT = 1, // Parse only base64 characters
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DO_PARSE_WHITE = 2, // Parse only base64 and whitespace characters
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DO_PARSE_ANY = 3, // Parse all characters
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DO_PARSE_MASK = 3,
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DO_PAD_YES = 4, // Padding is required
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DO_PAD_ANY = 8, // Padding is optional
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DO_PAD_NO = 12, // Padding is disallowed
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DO_PAD_MASK = 12,
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DO_TERM_BUFFER = 16, // Must termiante at end of buffer
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DO_TERM_CHAR = 32, // May terminate at any character boundary
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DO_TERM_ANY = 48, // May terminate at a sub-character bit offset
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DO_TERM_MASK = 48,
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// Strictest interpretation
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DO_STRICT = DO_PARSE_STRICT | DO_PAD_YES | DO_TERM_BUFFER,
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DO_LAX = DO_PARSE_ANY | DO_PAD_ANY | DO_TERM_CHAR,
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};
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typedef int DecodeFlags;
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static bool IsBase64Char(char ch);
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// Get the char next to the |ch| from the Base64Table.
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// If the |ch| is the last one in the Base64Table then returns
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// the first one from the table.
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// Expects the |ch| be a base64 char.
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// The result will be saved in |next_ch|.
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// Returns true on success.
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static bool GetNextBase64Char(char ch, char* next_ch);
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// Determines whether the given string consists entirely of valid base64
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// encoded characters.
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static bool IsBase64Encoded(const std::string& str);
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static void EncodeFromArray(const void* data, size_t len,
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std::string* result);
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static bool DecodeFromArray(const char* data, size_t len, DecodeFlags flags,
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std::string* result, size_t* data_used);
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static bool DecodeFromArray(const char* data, size_t len, DecodeFlags flags,
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std::vector<char>* result, size_t* data_used);
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// Convenience Methods
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static inline std::string Encode(const std::string& data) {
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std::string result;
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EncodeFromArray(data.data(), data.size(), &result);
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return result;
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}
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static inline std::string Decode(const std::string& data, DecodeFlags flags) {
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std::string result;
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DecodeFromArray(data.data(), data.size(), flags, &result, NULL);
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return result;
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}
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static inline bool Decode(const std::string& data, DecodeFlags flags,
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std::string* result, size_t* data_used)
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{
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return DecodeFromArray(data.data(), data.size(), flags, result, data_used);
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}
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static inline bool Decode(const std::string& data, DecodeFlags flags,
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std::vector<char>* result, size_t* data_used)
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{
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return DecodeFromArray(data.data(), data.size(), flags, result, data_used);
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}
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private:
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static const char Base64Table[];
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static const unsigned char DecodeTable[];
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static size_t GetNextQuantum(DecodeFlags parse_flags, bool illegal_pads,
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const char* data, size_t len, size_t* dpos,
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unsigned char qbuf[4], bool* padded);
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template<typename T>
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static bool DecodeFromArrayTemplate(const char* data, size_t len,
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DecodeFlags flags, T* result,
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size_t* data_used);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_BASE64_H__
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