firebase-ios-sdk/Crashlytics/Shared/FIRCLSUUID.m

// Copyright 2019 Google
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import "Crashlytics/Shared/FIRCLSUUID.h"

#import "Crashlytics/Shared/FIRCLSByteUtility.h"

/// Use an enum to define a true compile-time integer constant. This prevents
/// warning below where the constant is used to declare the size of an array.
enum {
  /// The buffer size needed to hold the hexadecimal string representation of a
  /// 16-byte UUID. This accounts for 32 characters (2 for each byte) plus one
  /// byte for the null terminator.
  FIRCLSUUIDStringLength = (16 * 2) + 1
};

#pragma mark Public methods

NSString *FIRCLSGenerateUUID(void) {
  NSString *string;

  CFUUIDRef uuid = CFUUIDCreate(kCFAllocatorDefault);
  string = CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, uuid));
  CFRelease(uuid);

  return string;
}

NSString *FIRCLSUUIDToNSString(const uint8_t *uuid) {
  char uuidString[FIRCLSUUIDStringLength];

  FIRCLSSafeHexToString(uuid, 16, uuidString);

  return [NSString stringWithUTF8String:uuidString];
}