diff options
Diffstat (limited to 'ml/dlib/examples/file_to_code_ex.cpp')
-rw-r--r-- | ml/dlib/examples/file_to_code_ex.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/ml/dlib/examples/file_to_code_ex.cpp b/ml/dlib/examples/file_to_code_ex.cpp new file mode 100644 index 00000000..ce49bde7 --- /dev/null +++ b/ml/dlib/examples/file_to_code_ex.cpp @@ -0,0 +1,111 @@ +// 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; +} + |