mirror of https://github.com/davisking/dlib.git
112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
// 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;
|
|
}
|
|
|