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69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// See the file "COPYING" in the main distribution directory for copyright.
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#pragma once
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#include <string>
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namespace zeek {
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class String;
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class Connection;
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namespace detail {
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// Maybe we should have a base class for generic decoders?
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class Base64Converter {
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public:
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// <conn> is used for error reporting. If it is set to zero (as,
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// e.g., done by the built-in functions decode_base64() and
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// encode_base64()), encoding-errors will go to Reporter instead of
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// Weird. Usage errors go to Reporter in any case. Empty alphabet
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// indicates the default base64 alphabet.
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explicit Base64Converter(Connection* conn, const std::string& alphabet = "");
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~Base64Converter();
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// A note on Decode():
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//
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// The input is specified by <len> and <data> and the output
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// buffer by <blen> and <buf>. If *buf is nil, a buffer of
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// an appropriate size will be new'd and *buf will point
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// to the buffer on return. *blen holds the length of
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// decoded data on return. The function returns the number of
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// input bytes processed, since the decoding will stop when there
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// is not enough output buffer space.
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int Decode(int len, const char* data, int* blen, char** buf);
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void Encode(int len, const unsigned char* data, int* blen, char** buf);
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int Done(int* pblen, char** pbuf);
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bool HasData() const { return base64_group_next != 0; }
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// True if an error has occurred.
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int Errored() const { return errored; }
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const char* ErrorMsg() const { return error_msg; }
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void IllegalEncoding(const char* msg);
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protected:
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char error_msg[256];
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protected:
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static const std::string default_alphabet;
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std::string alphabet;
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static int* InitBase64Table(const std::string& alphabet);
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static int default_base64_table[256];
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char base64_group[4];
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int base64_group_next;
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int base64_padding;
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int base64_after_padding;
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int* base64_table;
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int errored; // if true, we encountered an error - skip further processing
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Connection* conn;
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};
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String* decode_base64(const String* s, const String* a = nullptr, Connection* conn = nullptr);
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String* encode_base64(const String* s, const String* a = nullptr, Connection* conn = nullptr);
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} // namespace detail
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} // namespace zeek
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