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// dump2def.cxx - Written and placed in public domain by Jeffrey Walton
// Create a module definitions file from a dumpbin file.
// dump2def can be used to create a list of exports from
// a static library. Then, the exports can used to build
// a dynamic link library with the same exports.
//
// The workflow for Crypto++ is:
//
// 1. Open a Developer Prompt
// 2. CD to cryptopp/ directory
// 3. nmake /f cryptest.nmake cryptopp.dll
//
// The cryptopp.dll recipe first builds cryptlib.lib. Then it calls
// dumpbin.exe to export all symbols from cryptlib.lib and writes them
// to cryptopp.dump. The recipe then calls dump2def.exe to create a
// module definition file. Finally, the recipe builds cryptopp.dll
// using the module definition file cryptopp.def. The linker creates
// the import lib cryptopp.lib and export cryptopp.exp automatically.
//
// This is only "half the problem solved" for those who wish to use
// a DLL. The program must import the import lib cryptopp.lib. Then
// the program must ensure the library headers export the symbol or
// class with CRYPTOPP_DLL. CRYPTOPP_DLL is only present on some classes
// because the FIPS module only allowed approved algorithms like AES and
// SHA. Other classes like Base64Encoder and HexEncoder lack CRYPTOPP_DLL.
//
// CRYPTOPP_DLL simply adds declspec(dllimport) when CRYPTOPP_IMPORTS is
// defined. The limitation of requiring declspec(dllimport) is imposed by
// Microsoft. Microsoft does not allow a program to "import everything".
//
// If you would like to read more about the FIPS module and the pain it
// causes then see https://www.cryptopp.com/wiki/FIPS_DLL. In fact we
// recommend you delete the CryptDll and DllTest projects from the
// Visual Studio solution file.
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <set>
// Friendly name
#define LIBRARY_NAME "Crypto++ Library"
typedef std::set<std::string> SymbolMap;
void PrintHelpAndExit(int code)
{
std::cout << "dump2def - create a module definitions file from a dumpbin file" << std::endl;
std::cout << " Written and placed in public domain by Jeffrey Walton" << std::endl;
std::cout << std::endl;
std::cout << "Usage: " << std::endl;
std::cout << " dump2def <infile>" << std::endl;
std::cout << " - Create a def file from <infile> and write it to a file with" << std::endl;
std::cout << " the same name as <infile> but using the .def extension" << std::endl;
std::cout << " dump2def <infile> <outfile>" << std::endl;
std::cout << " - Create a def file from <infile> and write it to <outfile>" << std::endl;
std::exit(code);
}
int main(int argc, char* argv[])
{
// ******************** Handle Options ******************** //
// Convenience item
std::vector<std::string> opts;
for (size_t i=0; i<argc; ++i)
opts.push_back(argv[i]);
// Look for help
std::string opt = opts.size() < 3 ? "" : opts[1].substr(0,2);
if (opt == "/h" || opt == "-h" || opt == "/?" || opt == "-?")
PrintHelpAndExit(0);
// Add <outfile> as needed
if (opts.size() == 2)
{
std::string outfile = opts[1];
std::string::size_type pos = outfile.length() < 5 ? std::string::npos : outfile.length() - 5;
if (pos == std::string::npos || outfile.substr(pos) != ".dump")
PrintHelpAndExit(1);
outfile.replace(pos, 5, ".def");
opts.push_back(outfile);
}
// Check or exit
if (opts.size() != 3)
PrintHelpAndExit(1);
// ******************** Read MAP file ******************** //
SymbolMap symbols;
try
{
std::ifstream infile(opts[1].c_str());
std::string::size_type pos;
std::string line;
// Find start of the symbol table
while (std::getline(infile, line))
{
pos = line.find("public symbols");
if (pos == std::string::npos) { continue; }
// Eat the whitespace after the table heading
infile >> std::ws;
break;
}
while (std::getline(infile, line))
{
// End of table
if (line.empty()) { break; }
std::istringstream iss(line);
std::string address, symbol;
iss >> address >> symbol;
symbols.insert(symbol);
}
}
catch (const std::exception& ex)
{
std::cerr << "Unexpected exception:" << std::endl;
std::cerr << ex.what() << std::endl;
std::cerr << std::endl;
PrintHelpAndExit(1);
}
// ******************** Write DEF file ******************** //
try
{
std::ofstream outfile(opts[2].c_str());
// Library name, cryptopp.dll
std::string name = opts[2];
std::string::size_type pos = name.find_last_of(".");
if (pos != std::string::npos)
name.erase(pos);
outfile << "LIBRARY " << name << std::endl;
outfile << "DESCRIPTION \"" << LIBRARY_NAME << "\"" << std::endl;
outfile << "EXPORTS" << std::endl;
outfile << std::endl;
outfile << "\t;; " << symbols.size() << " symbols" << std::endl;
// Symbols from our object files
SymbolMap::const_iterator it = symbols.begin();
for ( ; it != symbols.end(); ++it)
outfile << "\t" << *it << std::endl;
}
catch (const std::exception& ex)
{
std::cerr << "Unexpected exception:" << std::endl;
std::cerr << ex.what() << std::endl;
std::cerr << std::endl;
PrintHelpAndExit(1);
}
return 0;
}
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