void searchCurrentJavaRegistry()

in src/main/cpp/launcher/windows/src/JavaUtils.c [391:489]
85 lines of code
18 McCabe index (conditional complexity)

void searchCurrentJavaRegistry(LauncherProperties * props, BOOL access64key) {
    DWORD i=0;
    WCHAR ** keys = JAVA_REGISTRY_KEYS;
    DWORD k=0;
    WCHAR * buffer = newpWCHAR(MAX_LEN_VALUE_NAME);
    HKEY rootKeys [2] = {HKEY_LOCAL_MACHINE, HKEY_CURRENT_USER};
    DWORD rootKeysNumber = sizeof(rootKeys)/sizeof(HKEY);
    DWORD keysNumber = sizeof(JAVA_REGISTRY_KEYS)/sizeof(WCHAR*);
    
    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "Search java in CurrentVersion values...", 1);
    
    
    for ( k = 0; k < rootKeysNumber; k++) {
        for(i=0; i < keysNumber;i++) {
            if(isTerminated(props)) {
                return;
            }
            else {
                
                WCHAR * value = getStringValue(rootKeys[k], keys[i], CURRENT_VERSION, access64key);
                if(value!=NULL) {
                    WCHAR *javaHome = getStringValuePC(rootKeys[k], keys[i], value, JAVA_HOME, access64key);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "... ", 0);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, (rootKeys[k]==HKEY_LOCAL_MACHINE) ? "HKEY_LOCAL_MACHINE" : "HKEY_CURRENT_USER", 0);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "\\", 0);
                    writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, keys[i], 0);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "\\", 0);
                    writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, CURRENT_VERSION, 0);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "->", 0);
                    writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, value, 0);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "[", 0);
                    writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, JAVA_HOME, 0);
                    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "] = ", 0);
                    writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, javaHome, 1);
                    
                    FREE(value);
                    trySetCompatibleJava(javaHome, props);
                    FREE(javaHome);
                    if(props->java!=NULL) {
                        FREE(buffer);
                        return;
                    }
                }
            }
        }
    }
    
    
    // we found no CurrentVersion java... just search for other possible keys
    writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "Search java in other values...", 1);
    
    
    for(k=0;k<rootKeysNumber;k++) {
        for(i=0;i<keysNumber;i++) {
            HKEY  hkey = 0;
            DWORD   index  = 0 ;
            if (RegOpenKeyExW(rootKeys[k], keys[i], 0, KEY_READ | ((access64key && IsWow64) ? KEY_WOW64_64KEY : 0), &hkey) == ERROR_SUCCESS) {
                DWORD number = 0;
                if (RegQueryInfoKeyW(hkey, NULL, NULL, NULL, &number, NULL, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) {
                    DWORD err = 0;
                    do {
                        
                        DWORD size = MAX_LEN_VALUE_NAME;
                        buffer[0]  = 0;
                        err = RegEnumKeyExW(hkey, index, buffer, &size, NULL, NULL, NULL, NULL);
                        if (err == ERROR_SUCCESS) {
                            WCHAR  * javaHome = getJavaHomeValue(keys[i], buffer, access64key);
                            
                            writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, (rootKeys[k]==HKEY_LOCAL_MACHINE) ? "HKEY_LOCAL_MACHINE" : "HKEY_CURRENT_USER", 0);
                            writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "\\", 0);
                            writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, keys[i], 0);
                            writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "\\", 0);
                            writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, buffer, 0);
                            writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "[", 0);
                            writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, JAVA_HOME, 0);
                            writeMessageA(props, OUTPUT_LEVEL_NORMAL, 0, "] = ", 0);
                            writeMessageW(props, OUTPUT_LEVEL_NORMAL, 0, javaHome, 1);
                            
                            trySetCompatibleJava(javaHome, props);
                            FREE(javaHome);
                            if(props->java!=NULL) {
                                i = keysNumber; // to the end of cycles
                                k = rootKeysNumber;
                                break;
                            }
                            
                        }
                        index++;
                    } while (err == ERROR_SUCCESS);
                }
            }
            if (hkey != 0) {
                RegCloseKey(hkey);
            }
        }
    }
    FREE(buffer);
    return;
}