use null terminated string for userinfo

Sources/KSCrashRecording/KSCrash.m

@@ -170,8 +170,9 @@ - (void)setUserInfo:(NSDictionary *)userInfo
         }
     }
 
-    const char *userInfoCString = userInfoJSON ? [userInfoJSON bytes] : NULL;
-    kscrash_setUserInfoJSON(userInfoCString);
+    NSString *userInfoString =
+        userInfoJSON ? [[NSString alloc] initWithData:userInfoJSON encoding:NSUTF8StringEncoding] : nil;
+    kscrash_setUserInfoJSON(userInfoString.UTF8String);
 }
 
 - (BOOL)reportsMemoryTerminations
@@ -320,16 +321,6 @@ -(TYPE)NAME { return kscrashstate_currentState()->NAME; }
 #pragma mark - Utility -
 // ============================================================================
 
-- (NSMutableData *)nullTerminated:(NSData *)data
-{
-    if (data == nil) {
-        return NULL;
-    }
-    NSMutableData *mutable = [NSMutableData dataWithData:data];
-    [mutable appendBytes:"\0" length:1];
-    return mutable;
-}
-
 + (NSError *)errorForInstallErrorCode:(KSCrashInstallErrorCode)errorCode
 {
     NSString *errorDescription;

Tests/KSCrashRecordingTests/KSCrash_Tests.m

@@ -0,0 +1,51 @@
+//
+//  KSCrash_Tests.m
+//
+//  Created by Aliaksei Nestsiarovich on 11.11.2024.
+//
+//  Copyright (c) 2012 Karl Stenerud. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall remain in place
+// in this source code.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+#import <XCTest/XCTest.h>
+
+#import "KSCrash.h"
+
+@interface KSCrash_Tests : XCTestCase
+@end
+
+@implementation KSCrash_Tests
+
+- (void)testUserInfo
+{
+    NSDictionary *userInfo = @{ @"key1" : @"value1", @"key2" : @123 };
+    [[KSCrash sharedInstance] setUserInfo:userInfo];
+
+    XCTAssertEqualObjects([[KSCrash sharedInstance] userInfo], userInfo);
+}
+
+- (void)testUserInfoIfNul
+{
+    [[KSCrash sharedInstance] setUserInfo:nil];
+
+    XCTAssertNil([[KSCrash sharedInstance] userInfo]);
+}
+
+@end