Show org_lwjgl_d3d_WindowsRegistry.c syntax highlighted
/*
* Copyright (c) 2002-2004 LWJGL Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'LWJGL' nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* $Id: org_lwjgl_d3d_WindowsRegistry.c 2775 2007-04-19 22:21:04Z matzon $
*
* @author elias_naur <elias_naur@users.sourceforge.net>
* @version $Revision: 2775 $
*/
#include <jni.h>
#include <windows.h>
#include "org_lwjgl_d3d_WindowsRegistry.h"
#include "common_tools.h"
/*
* Return a string containing the queried value, or NULL of the method fails.
* In that case, a java exception is thrown.
*/
static jstring queryRegistrationKey(JNIEnv *env, HKEY root_key, LPCTSTR subkey, LPCTSTR value) {
DWORD buf_size = 1;
char *result;
HKEY hKey;
LONG lRet;
jstring java_result;
if(RegOpenKeyEx(root_key,
TEXT(subkey),
0,
KEY_QUERY_VALUE,
&hKey) != ERROR_SUCCESS) {
throwException(env, "Failed to open registry key");
return NULL;
}
result = (char *)malloc(buf_size);
if (result == NULL) {
RegCloseKey(hKey);
throwException(env, "Failed to allocate buffer");
return NULL;
}
while (1) {
lRet = RegQueryValueEx(hKey,
TEXT(value),
NULL,
NULL,
(LPBYTE)result,
&buf_size);
if (lRet != ERROR_SUCCESS && lRet != ERROR_MORE_DATA) {
RegCloseKey(hKey);
free(result);
throwException(env, "Failed query key value");
return NULL;
}
if (lRet == ERROR_SUCCESS) {
RegCloseKey(hKey);
// make sure the result has a terminating null
buf_size += 1;
result = (char *)realloc(result, buf_size);
if (result == NULL) {
throwException(env, "Failed to resize buffer");
return NULL;
}
result[buf_size - 1] = '\0';
java_result = NewStringNativeWithLength(env, result, strlen(result));
free(result);
return java_result;
}
result = (char *)realloc(result, buf_size);
if (result == NULL) {
RegCloseKey(hKey);
throwException(env, "Failed to resize buffer");
return NULL;
}
}
}
static HKEY enumToRootKey(jint root_key_enum) {
switch (root_key_enum) {
case org_lwjgl_d3d_WindowsRegistry_HKEY_CLASSES_ROOT:
return HKEY_CLASSES_ROOT;
case org_lwjgl_d3d_WindowsRegistry_HKEY_CURRENT_USER:
return HKEY_CURRENT_USER;
case org_lwjgl_d3d_WindowsRegistry_HKEY_LOCAL_MACHINE:
return HKEY_LOCAL_MACHINE;
case org_lwjgl_d3d_WindowsRegistry_HKEY_USERS:
return HKEY_USERS;
default:
return 0;
}
}
JNIEXPORT jstring JNICALL Java_org_lwjgl_d3d_WindowsRegistry_nQueryRegistrationKey (JNIEnv *env, jclass unused, jint root_key, jstring subkey, jstring value) {
HKEY root = enumToRootKey(root_key);
char *subkey_native;
char *value_native;
jstring result;
subkey_native = GetStringNativeChars(env, subkey);
if (subkey_native == NULL) {
throwException(env, "Failed to fetch the native string");
return NULL;
}
value_native = GetStringNativeChars(env, value);
if (value_native == NULL) {
free(subkey_native);
throwException(env, "Failed to fetch the native string");
return NULL;
}
result = queryRegistrationKey(env, root, subkey_native, value_native);
free(subkey_native);
free(value_native);
return result;
}
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