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/*
* Copyright 2017 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 "FSTUtil.h"
NS_ASSUME_NONNULL_BEGIN
static const double kArc4RandomMax = 0x100000000;
static const int kAutoIDLength = 20;
static NSString *const kAutoIDAlphabet =
@"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
@implementation FSTUtil
+ (double)randomDouble {
return ((double)arc4random() / kArc4RandomMax);
}
+ (NSString *)autoID {
unichar autoID[kAutoIDLength];
for (int i = 0; i < kAutoIDLength; i++) {
uint32_t randIndex = arc4random_uniform((uint32_t)kAutoIDAlphabet.length);
autoID[i] = [kAutoIDAlphabet characterAtIndex:randIndex];
}
return [NSString stringWithCharacters:autoID length:kAutoIDLength];
}
@end
NS_ASSUME_NONNULL_END
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