CommonIO.cpp

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/*
        This file is part of cpp-ethereum.

        cpp-ethereum is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        cpp-ethereum is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "CommonIO.h"
#include <iostream>
#include <cstdlib>
#include <fstream>
#include <stdio.h>
#if defined(_WIN32)
#include <windows.h>
#else
#include <termios.h>
#endif
#include <boost/filesystem.hpp>
#include "Exceptions.h"
using namespace std;
using namespace dev;

string dev::memDump(bytes const& _bytes, unsigned _width, bool _html)
{
        stringstream ret;
        if (_html)
                ret << "<pre style=\"font-family: Monospace,Lucida Console,Courier,Courier New,sans-serif; font-size: small\">";
        for (unsigned i = 0; i < _bytes.size(); i += _width)
        {
                ret << hex << setw(4) << setfill('0') << i << " ";
                for (unsigned j = i; j < i + _width; ++j)
                        if (j < _bytes.size())
                                if (_bytes[j] >= 32 && _bytes[j] < 127)
                                        if ((char)_bytes[j] == '<' && _html)
                                                ret << "&lt;";
                                        else if ((char)_bytes[j] == '&' && _html)
                                                ret << "&amp;";
                                        else
                                                ret << (char)_bytes[j];
                                else
                                        ret << '?';
                        else
                                ret << ' ';
                ret << " ";
                for (unsigned j = i; j < i + _width && j < _bytes.size(); ++j)
                        ret << setfill('0') << setw(2) << hex << (unsigned)_bytes[j] << " ";
                ret << "\n";
        }
        if (_html)
                ret << "</pre>";
        return ret.str();
}

template <typename _T>
inline _T contentsGeneric(std::string const& _file)
{
        _T ret;
        size_t const c_elementSize = sizeof(typename _T::value_type);
        std::ifstream is(_file, std::ifstream::binary);
        if (!is)
                return ret;

        // get length of file:
        is.seekg(0, is.end);
        streamoff length = is.tellg();
        if (length == 0)
                return ret; // do not read empty file (MSVC does not like it)
        is.seekg(0, is.beg);

        ret.resize((length + c_elementSize - 1) / c_elementSize);
        is.read(const_cast<char*>(reinterpret_cast<char const*>(ret.data())), length);
        return ret;
}

bytes dev::contents(string const& _file)
{
        return contentsGeneric<bytes>(_file);
}

bytesSec dev::contentsSec(string const& _file)
{
        bytes b = contentsGeneric<bytes>(_file);
        bytesSec ret(b);
        bytesRef(&b).cleanse();
        return ret;
}

string dev::contentsString(string const& _file)
{
        return contentsGeneric<string>(_file);
}

void dev::writeFile(std::string const& _file, bytesConstRef _data, bool _writeDeleteRename)
{
        namespace fs = boost::filesystem;
        if (_writeDeleteRename)
        {
                fs::path tempPath = fs::unique_path(_file + "-%%%%%%");
                writeFile(tempPath.string(), _data, false);
                // will delete _file if it exists
                fs::rename(tempPath, _file);
        }
        else
        {
                // create directory if not existent
                fs::path p(_file);
                if (!fs::exists(p.parent_path()))
                {
                        fs::create_directories(p.parent_path());
                        DEV_IGNORE_EXCEPTIONS(fs::permissions(p.parent_path(), fs::owner_all));
                }

                ofstream s(_file, ios::trunc | ios::binary);
                s.write(reinterpret_cast<char const*>(_data.data()), _data.size());
                if (!s)
                        BOOST_THROW_EXCEPTION(FileError() << errinfo_comment("Could not write to file: " + _file));
                DEV_IGNORE_EXCEPTIONS(fs::permissions(_file, fs::owner_read|fs::owner_write));
        }
}

std::string dev::getPassword(std::string const& _prompt)
{
#if defined(_WIN32)
        cout << _prompt << flush;
        // Get current Console input flags
        HANDLE hStdin;
        DWORD fdwSaveOldMode;
        if ((hStdin = GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE)
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("GetStdHandle"));
        if (!GetConsoleMode(hStdin, &fdwSaveOldMode))
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("GetConsoleMode"));
        // Set console flags to no echo
        if (!SetConsoleMode(hStdin, fdwSaveOldMode & (~ENABLE_ECHO_INPUT)))
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("SetConsoleMode"));
        // Read the string
        std::string ret;
        std::getline(cin, ret);
        // Restore old input mode
        if (!SetConsoleMode(hStdin, fdwSaveOldMode))
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("SetConsoleMode"));
        return ret;
#else
        struct termios oflags;
        struct termios nflags;
        char password[256];

        // disable echo in the terminal
        tcgetattr(fileno(stdin), &oflags);
        nflags = oflags;
        nflags.c_lflag &= ~ECHO;
        nflags.c_lflag |= ECHONL;

        if (tcsetattr(fileno(stdin), TCSANOW, &nflags) != 0)
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("tcsetattr"));

        printf("%s", _prompt.c_str());
        if (!fgets(password, sizeof(password), stdin))
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("fgets"));
        password[strlen(password) - 1] = 0;

        // restore terminal
        if (tcsetattr(fileno(stdin), TCSANOW, &oflags) != 0)
                BOOST_THROW_EXCEPTION(ExternalFunctionFailure("tcsetattr"));


        return password;
#endif
}