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//*********************************************************************
//* C_Base64 - a simple base64 encoder and decoder.
//*
//* Copyright (c) 1999, Bob Withers - bwit@pobox.com
//*
//* This code may be freely used for any purpose, either personal
//* or commercial, provided the authors copyright notice remains
//* intact.
//*********************************************************************
#ifndef TALK_BASE_BASE64_H__
#define TALK_BASE_BASE64_H__
#include <string>
#include <vector>
namespace talk_base {
class Base64
{
public:
enum DecodeOption {
DO_PARSE_STRICT = 1, // Parse only base64 characters
DO_PARSE_WHITE = 2, // Parse only base64 and whitespace characters
DO_PARSE_ANY = 3, // Parse all characters
DO_PARSE_MASK = 3,
DO_PAD_YES = 4, // Padding is required
DO_PAD_ANY = 8, // Padding is optional
DO_PAD_NO = 12, // Padding is disallowed
DO_PAD_MASK = 12,
DO_TERM_BUFFER = 16, // Must termiante at end of buffer
DO_TERM_CHAR = 32, // May terminate at any character boundary
DO_TERM_ANY = 48, // May terminate at a sub-character bit offset
DO_TERM_MASK = 48,
// Strictest interpretation
DO_STRICT = DO_PARSE_STRICT | DO_PAD_YES | DO_TERM_BUFFER,
DO_LAX = DO_PARSE_ANY | DO_PAD_ANY | DO_TERM_CHAR,
};
typedef int DecodeFlags;
static bool IsBase64Char(char ch);
// Determines whether the given string consists entirely of valid base64
// encoded characters.
static bool IsBase64Encoded(const std::string& str);
static void EncodeFromArray(const void* data, size_t len,
std::string* result);
static bool DecodeFromArray(const char* data, size_t len, DecodeFlags flags,
std::string* result, size_t* data_used);
static bool DecodeFromArray(const char* data, size_t len, DecodeFlags flags,
std::vector<char>* result, size_t* data_used);
// Convenience Methods
static inline std::string Encode(const std::string& data) {
std::string result;
EncodeFromArray(data.data(), data.size(), &result);
return result;
}
static inline std::string Decode(const std::string& data, DecodeFlags flags) {
std::string result;
DecodeFromArray(data.data(), data.size(), flags, &result, NULL);
return result;
}
static inline bool Decode(const std::string& data, DecodeFlags flags,
std::string* result, size_t* data_used)
{
return DecodeFromArray(data.data(), data.size(), flags, result, data_used);
}
static inline bool Decode(const std::string& data, DecodeFlags flags,
std::vector<char>* result, size_t* data_used)
{
return DecodeFromArray(data.data(), data.size(), flags, result, data_used);
}
private:
static const std::string Base64Table;
static const unsigned char DecodeTable[];
static size_t GetNextQuantum(DecodeFlags parse_flags, bool illegal_pads,
const char* data, size_t len, size_t* dpos,
unsigned char qbuf[4], bool* padded);
template<typename T>
static bool DecodeFromArrayTemplate(const char* data, size_t len,
DecodeFlags flags, T* result,
size_t* data_used);
};
} // namespace talk_base
#endif // TALK_BASE_BASE64_H__
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