146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* $Id$
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*
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision$
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*/
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#include <jni.h>
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#include <windows.h>
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#include "org_lwjgl_opengl_WindowsRegistry.h"
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#include "common_tools.h"
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/*
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* Return a string containing the queried value, or NULL of the method fails.
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* In that case, a java exception is thrown.
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*/
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static jstring queryRegistrationKey(JNIEnv *env, HKEY root_key, LPCTSTR subkey, LPCTSTR value) {
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DWORD buf_size = 1;
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char *result;
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HKEY hKey;
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LONG lRet;
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jstring java_result;
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if(RegOpenKeyEx(root_key,
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TEXT(subkey),
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0,
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KEY_QUERY_VALUE,
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&hKey) != ERROR_SUCCESS) {
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throwException(env, "Failed to open registry key");
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return NULL;
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}
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result = (char *)malloc(buf_size);
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if (result == NULL) {
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RegCloseKey(hKey);
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throwException(env, "Failed to allocate buffer");
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return NULL;
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}
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while (1) {
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lRet = RegQueryValueEx(hKey,
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TEXT(value),
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NULL,
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NULL,
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(LPBYTE)result,
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&buf_size);
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if (lRet != ERROR_SUCCESS && lRet != ERROR_MORE_DATA) {
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RegCloseKey(hKey);
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free(result);
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throwException(env, "Failed query key value");
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return NULL;
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}
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if (lRet == ERROR_SUCCESS) {
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RegCloseKey(hKey);
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// make sure the result has a terminating null
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buf_size += 1;
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result = (char *)realloc(result, buf_size);
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if (result == NULL) {
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throwException(env, "Failed to resize buffer");
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return NULL;
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}
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result[buf_size - 1] = '\0';
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java_result = NewStringNativeWithLength(env, result, (jsize)strlen(result));
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free(result);
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return java_result;
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}
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result = (char *)realloc(result, buf_size);
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if (result == NULL) {
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RegCloseKey(hKey);
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throwException(env, "Failed to resize buffer");
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return NULL;
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}
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}
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}
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static HKEY enumToRootKey(jint root_key_enum) {
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switch (root_key_enum) {
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case org_lwjgl_opengl_WindowsRegistry_HKEY_CLASSES_ROOT:
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return HKEY_CLASSES_ROOT;
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case org_lwjgl_opengl_WindowsRegistry_HKEY_CURRENT_USER:
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return HKEY_CURRENT_USER;
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case org_lwjgl_opengl_WindowsRegistry_HKEY_LOCAL_MACHINE:
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return HKEY_LOCAL_MACHINE;
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case org_lwjgl_opengl_WindowsRegistry_HKEY_USERS:
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return HKEY_USERS;
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default:
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return 0;
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}
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}
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JNIEXPORT jstring JNICALL Java_org_lwjgl_opengl_WindowsRegistry_nQueryRegistrationKey (JNIEnv *env, jclass unused, jint root_key, jstring subkey, jstring value) {
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HKEY root = enumToRootKey(root_key);
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char *subkey_native;
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char *value_native;
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jstring result;
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subkey_native = GetStringNativeChars(env, subkey);
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if (subkey_native == NULL) {
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throwException(env, "Failed to fetch the native string");
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return NULL;
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}
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value_native = GetStringNativeChars(env, value);
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if (value_native == NULL) {
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free(subkey_native);
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throwException(env, "Failed to fetch the native string");
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return NULL;
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}
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result = queryRegistrationKey(env, root, subkey_native, value_native);
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free(subkey_native);
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free(value_native);
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return result;
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}
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