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// :mode=c++:
/*
decode.h - c++ wrapper for a base64 decoding algorithm
This is part of the libb64 project, and has been placed in the public domain.
For details, see http://sourceforge.net/projects/libb64
*/
#ifndef BASE64_DECODE_H
#define BASE64_DECODE_H
#include <iostream>
namespace base64
{
extern "C"
{
#include "cdecode.h"
}
struct decoder
{
base64_decodestate _state;
int _buffersize;
decoder(int buffersize_in = 4096)
: _buffersize(buffersize_in)
{}
int decode(char value_in)
{
return base64_decode_value(value_in);
}
int decode(const char* code_in, const int length_in, char* plaintext_out)
{
return base64_decode_block(code_in, length_in, plaintext_out, &_state);
}
std::string decode(const std::string& input)
{
base64_init_decodestate(&_state);
char* output = new char[2*input.size()];
int outlength = decode(input.c_str(), input.size(),
output);
std::string output_string(output, outlength);
base64_init_decodestate(&_state);
delete [] output;
return output_string;
}
void decode(std::istream& istream_in, std::ostream& ostream_in)
{
base64_init_decodestate(&_state);
//
const int N = _buffersize;
char* code = new char[N];
char* plaintext = new char[N];
int codelength;
int plainlength;
do
{
istream_in.read((char*)code, N);
codelength = istream_in.gcount();
plainlength = decode(code, codelength, plaintext);
ostream_in.write((const char*)plaintext, plainlength);
}
while (istream_in.good() && codelength > 0);
//
base64_init_decodestate(&_state);
delete [] code;
delete [] plaintext;
}
};
} // namespace base64
#endif // BASE64_DECODE_H
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