1#ifndef CRYPTOPP_BASECODE_H
2#define CRYPTOPP_BASECODE_H
3
4#include "filters.h"
5#include "algparam.h"
6#include "argnames.h"
7
8NAMESPACE_BEGIN(CryptoPP)
9
10//! base n encoder, where n is a power of 2
11class CRYPTOPP_DLL BaseN_Encoder : public Unflushable<Filter>
12{
13public:
14	BaseN_Encoder(BufferedTransformation *attachment=NULL)
15		{Detach(attachment);}
16
17	BaseN_Encoder(const byte *alphabet, int log2base, BufferedTransformation *attachment=NULL, int padding=-1)
18	{
19		Detach(attachment);
20		IsolatedInitialize(MakeParameters(Name::EncodingLookupArray(), alphabet)
21			(Name::Log2Base(), log2base)
22			(Name::Pad(), padding != -1)
23			(Name::PaddingByte(), byte(padding)));
24	}
25
26	void IsolatedInitialize(const NameValuePairs &parameters);
27	size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);
28
29private:
30	const byte *m_alphabet;
31	int m_padding, m_bitsPerChar, m_outputBlockSize;
32	int m_bytePos, m_bitPos;
33	SecByteBlock m_outBuf;
34};
35
36//! base n decoder, where n is a power of 2
37class CRYPTOPP_DLL BaseN_Decoder : public Unflushable<Filter>
38{
39public:
40	BaseN_Decoder(BufferedTransformation *attachment=NULL)
41		{Detach(attachment);}
42
43	BaseN_Decoder(const int *lookup, int log2base, BufferedTransformation *attachment=NULL)
44	{
45		Detach(attachment);
46		IsolatedInitialize(MakeParameters(Name::DecodingLookupArray(), lookup)(Name::Log2Base(), log2base));
47	}
48
49	void IsolatedInitialize(const NameValuePairs &parameters);
50	size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);
51
52	static void CRYPTOPP_API InitializeDecodingLookupArray(int *lookup, const byte *alphabet, unsigned int base, bool caseInsensitive);
53
54private:
55	const int *m_lookup;
56	int m_padding, m_bitsPerChar, m_outputBlockSize;
57	int m_bytePos, m_bitPos;
58	SecByteBlock m_outBuf;
59};
60
61//! filter that breaks input stream into groups of fixed size
62class CRYPTOPP_DLL Grouper : public Bufferless<Filter>
63{
64public:
65	Grouper(BufferedTransformation *attachment=NULL)
66		{Detach(attachment);}
67
68	Grouper(int groupSize, const std::string &separator, const std::string &terminator, BufferedTransformation *attachment=NULL)
69	{
70		Detach(attachment);
71		IsolatedInitialize(MakeParameters(Name::GroupSize(), groupSize)
72			(Name::Separator(), ConstByteArrayParameter(separator))
73			(Name::Terminator(), ConstByteArrayParameter(terminator)));
74	}
75
76	void IsolatedInitialize(const NameValuePairs &parameters);
77	size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);
78
79private:
80	SecByteBlock m_separator, m_terminator;
81	size_t m_groupSize, m_counter;
82};
83
84NAMESPACE_END
85
86#endif
87