src/platform_windows.cpp
author vb
Sun, 08 Feb 2015 15:18:48 -0500
changeset 55 0569864cb34e
parent 54 8f6b3a6b77a8
child 59 88429085f8da
permissions -rw-r--r--
unittest in main Makefile
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// Windows platform specifica
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#define WIN32_LEAN_AND_MEAN
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#ifndef UNICODE
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#define UNICODE
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#endif
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#define _WIN32_WINNT 0x0600
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#include <windows.h>
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#define _CRT_RAND_S
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#include <stdlib.h>
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#include <assert.h>
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#include <string>
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#include <stdexcept>
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#include "platform_windows.h"
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#ifndef WC_ERR_INVALID_CHARS
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#define WC_ERR_INVALID_CHARS      0x00000080  // error for invalid chars
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#endif
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using namespace std;
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static string utf8_string(wstring wstr) {
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    string result;
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    if (wstr.length()) {
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        int size = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS,
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                wstr.c_str(), -1, NULL, 0, NULL, NULL);
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        assert(size);
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        if (size) {
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            char *buf = new char[size];
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            WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, wstr.c_str(),
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                    -1, buf, size, NULL, NULL);
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            result = buf;
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            delete[] buf;
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        } else
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            throw out_of_range("input wstring is not valid"
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                    " while converting UTF-16 to UTF-8.");
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    }
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    return result;
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}
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static wstring utf16_string(string str) {
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    wstring result;
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    if (str.length()) {
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        int size = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
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                str.c_str(), -1, NULL, 0);
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        assert(size);
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        if (size) {
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            wchar_t * buf = new wchar_t[size];
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            MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.c_str(), -1,
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                    buf, size);
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            result = buf;
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            delete[] buf;
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        } else
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            throw out_of_range("input string is not valid"
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                    " while converting UTF-8 to UTF-16.");
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    }
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    return result;
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}
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static bool readRegistryString(
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        HKEY hKey, LPCTSTR lpSubKey, LPCTSTR lpValueName, LPTSTR lpResult,
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        DWORD dwSize, LPCTSTR lpDefault
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    )
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{
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    assert(lpResult);
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	HKEY theKey;
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	DWORD type;
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	DWORD bytesCopied = dwSize;
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	HRESULT result;
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	result = RegOpenKeyEx(hKey, lpSubKey, 0, KEY_READ, &theKey);
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	if (result != ERROR_SUCCESS) {
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		if (lpDefault) {
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			wcsncpy_s(lpResult, dwSize, lpDefault, _TRUNCATE);
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			return true;
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		}
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		else
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			return false;
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	}
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	result = RegQueryValueEx(theKey, lpValueName, NULL, &type,
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            (LPBYTE) lpResult, &bytesCopied);
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    if (result != ERROR_SUCCESS || (type != REG_EXPAND_SZ && type != REG_SZ)) {
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		if (lpDefault) {
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			wcsncpy_s(lpResult, dwSize, lpDefault, _TRUNCATE);
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			RegCloseKey(theKey);
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			return true;
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		}
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		else {
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			RegCloseKey(theKey);
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			return false;
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		}
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	}
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	RegCloseKey(theKey);
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	return true;
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}
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static const DWORD PATH_BUF_SIZE = 32768;
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static inline string managementPath(const char *file_path, const char *file_name)
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{
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    string path;
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	static TCHAR tPath[PATH_BUF_SIZE];
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    DWORD length = ExpandEnvironmentStringsW(utf16_string(file_path).c_str(),
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            tPath, PATH_BUF_SIZE);
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	assert(length);
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    if (length == 0)
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        throw bad_alloc(); // BUG: there are other errors possible beside out of memory
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	CreateDirectory(tPath, NULL);
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	DWORD error = GetLastError();
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	assert(error == 0 || error == ERROR_ALREADY_EXISTS);
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	path = utf8_string(tPath);
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	path += "\\";
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	path += file_name;
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	return path;
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}
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extern "C" {
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void *dlopen(const char *filename, int flag) {
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	static TCHAR path[PATH_BUF_SIZE];
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    assert(filename);
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	assert(flag == RTLD_LAZY); // only lazy binding is implemented
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    bool result = readRegistryString(HKEY_LOCAL_MACHINE,
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            TEXT("SOFTWARE\\GNU\\GnuPG"), TEXT("Install Directory"), path,
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            PATH_BUF_SIZE, NULL);
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	assert(result);
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	if (!result)
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		return NULL;
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    SetDllDirectory(TEXT(""));
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    BOOL _result = SetDllDirectory(path);
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    assert(_result != 0);
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    if (_result == 0)
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        return NULL;
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	HMODULE module = LoadLibrary(utf16_string(filename).c_str());
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    SetDllDirectory(NULL);
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	if (module == NULL)
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		return NULL;
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	else
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		return (void *) module;
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}
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int dlclose(void *handle) {
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	if (FreeLibrary((HMODULE) handle))
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		return 0;
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	else
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		return 1;
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}
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void *dlsym(void *handle, const char *symbol) {
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	return (void *) (intptr_t) GetProcAddress((HMODULE) handle, symbol);
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}
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const char *windoze_local_db(void) {
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	static string path;
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	if (path.length() == 0)
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        path = managementPath("%LOCALAPPDATA%\\pEp", "management.db");
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    return path.c_str();
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}
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const char *windoze_system_db(void) {
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	static string path;
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	if (path.length() == 0)
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		path = managementPath("%ALLUSERSPROFILE%\\pEp", "system.db");
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    return path.c_str();
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}
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const char *gpg_conf(void)
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{
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    static string path;
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    if (path.length() == 0)
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        path = managementPath("%APPDATA%\\gnupg", "gpg.conf");
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    return path.c_str();
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}
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long random(void)
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{
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    unsigned int r;
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    errno_t e;
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    assert(sizeof(unsigned int) == sizeof(long)); // this is Windoze
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    do {
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        e = rand_s(&r);
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    } while (e);
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    return (long) (r & ((1<<31)-1));
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}
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} // "C"