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