mirror of https://github.com/davisking/dlib.git
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
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/*
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This is an example illustrating the use of the compress_stream and
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base64 components from the dlib C++ Library.
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It reads in a file from the disk and compresses it in an in memory buffer and
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then converts that buffer into base64 text. The final step is to output to
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the screen some C++ code that contains this base64 encoded text and can decompress
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it back into its original form.
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*/
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#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <string>
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#include <cstdlib>
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#include "dlib/compress_stream.h"
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#include "dlib/base64.h"
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using namespace std;
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using namespace dlib;
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int main(int argc, char** argv)
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{
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if (argc != 2)
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{
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cout << "You must give a file name as the argument to this program.\n" << endl;
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cout << "This program reads in a file from the disk and compresses\n"
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<< "it in an in memory buffer and then converts that buffer \n"
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<< "into base64 text. The final step is to output to the screen\n"
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<< "some C++ code that contains this base64 encoded text and can\n"
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<< "decompress it back into its original form.\n" << endl;
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return EXIT_FAILURE;
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}
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// open the file the user specified on the command line
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ifstream fin(argv[1], ios::binary);
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if (!fin) {
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cout << "can't open file " << argv[1] << endl;
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return EXIT_FAILURE;
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}
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ostringstream sout;
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istringstream sin;
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// this is the object we will use to do the base64 encoding
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base64::kernel_1a base64_coder;
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// this is the object we will use to do the data compression
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compress_stream::kernel_1ea compressor;
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// compress the contents of the file and store the results in the string stream sout
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compressor.compress(fin,sout);
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sin.str(sout.str());
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sout.clear();
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sout.str("");
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// now base64 encode the compressed data
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base64_coder.encode(sin,sout);
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sin.clear();
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sin.str(sout.str());
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sout.str("");
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// the following is a little funny looking but all it does is output some C++ code
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// that contains the compressed/base64 data and the C++ code that can decode it back
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// into its original form.
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sout << "#include <sstream>\n";
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sout << "#include <dlib/compress_stream.h>\n";
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sout << "#include <dlib/base64.h>\n";
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sout << "\n";
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sout << "// This function returns the contents of the file '" << argv[1] << "'\n";
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sout << "const std::string get_decoded_string()\n";
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sout << "{\n";
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sout << " dlib::base64::kernel_1a base64_coder;\n";
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sout << " dlib::compress_stream::kernel_1ea compressor;\n";
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sout << " std::ostringstream sout;\n";
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sout << " std::istringstream sin;\n\n";
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sout << " // The base64 encoded data from the file '" << argv[1] << "' we want to decode and return.\n";
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string temp;
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getline(sin,temp);
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while (sin && temp.size() > 0)
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{
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sout << " sout << \"" << temp << "\";\n";
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getline(sin,temp);
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}
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sout << "\n";
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sout << " // Put the data into the istream sin\n";
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sout << " sin.str(sout.str());\n";
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sout << " sout.str(\"\");\n\n";
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sout << " // Decode the base64 text into its compressed binary form\n";
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sout << " base64_coder.decode(sin,sout);\n";
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sout << " sin.clear();\n";
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sout << " sin.str(sout.str());\n";
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sout << " sout.str(\"\");\n\n";
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sout << " // Decompress the data into its original form\n";
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sout << " compressor.decompress(sin,sout);\n\n";
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sout << " // Return the decoded and decompressed data\n";
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sout << " return sout.str();\n";
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sout << "}\n";
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// finally output our encoded data and its C++ code to the screen
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cout << sout.str() << endl;
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}
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