95 lines
2.5 KiB
C++
Executable File
95 lines
2.5 KiB
C++
Executable File
/*
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base64.cc - c++ source to a base64 reference encoder and decoder
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This is part of the libb64 project, and has been placed in the public domain.
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For details, see http://sourceforge.net/projects/libb64
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*/
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#include <b64/encode.h>
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#include <b64/decode.h>
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#include <iostream>
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#include <fstream>
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#include <string>
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#include <stdlib.h>
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// Function which prints the usage of this executable
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void usage()
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{
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std::cerr<< \
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"base64: Encodes and Decodes files using base64\n" \
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"Usage: base64 [-e|-d] [input] [output]\n" \
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" Where [-e] will encode the input file into the output file,\n" \
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" [-d] will decode the input file into the output file, and\n" \
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" [input] and [output] are the input and output files, respectively.\n";
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}
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// Function which prints the usage of this executable, plus a short message
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void usage(const std::string& message)
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{
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usage();
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std::cerr<<"Incorrect invocation of base64:\n";
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std::cerr<<message<<std::endl;
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}
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int main(int argc, char** argv)
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{
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// Quick check for valid arguments
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if (argc == 1)
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{
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usage();
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exit(-1);
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}
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if (argc != 4)
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{
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usage("Wrong number of arguments!");
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exit(-1);
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}
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// So far so good; try to open the input file
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std::string input = argv[2];
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// Note that we have to open the input in binary mode.
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// This is due to some operating systems not using binary mode by default.
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// Since we will most likely be dealing with binary files when encoding, we
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// have to be able to deal with zeros (and other invalid chars) in the input stream.
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std::ifstream instream(input.c_str(), std::ios_base::in | std::ios_base::binary);
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if (!instream.is_open())
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{
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usage("Could not open input file!");
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exit(-1);
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}
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// Now try to open the output file
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std::string output = argv[3];
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// Again, note that we have to open the ouput in binary mode.
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// Similiarly, we will most likely need to deal with zeros in the output stream when we
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// are decoding, and the output stream has to be able to use these invalid text chars.
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std::ofstream outstream(output.c_str(), std::ios_base::out | std::ios_base::binary);
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if (!outstream.is_open())
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{
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usage("Could not open output file!");
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exit(-1);
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}
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// determine whether we need to encode or decode:
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std::string choice = argv[1];
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if (choice == "-d")
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{
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base64::decoder D;
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D.decode(instream, outstream);
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}
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else if (choice == "-e")
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{
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base64::encoder E;
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E.encode(instream, outstream);
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}
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else
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{
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std::cout<<"["<<choice<<"]"<<std::endl;
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usage("Please specify -d or -e as first argument!");
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}
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return 0;
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}
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