48 lines
1.4 KiB
Objective-C
48 lines
1.4 KiB
Objective-C
#import "TestUtil.h"
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NSObject* churnLock(void) {
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static NSObject* shared = nil;
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if (shared == nil) {
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shared = [NSObject new];
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}
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return shared;
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}
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bool _testChurnHelper(int (^condition)(), NSTimeInterval delay) {
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NSTimeInterval t = [TimeUtil time] + delay;
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while ([TimeUtil time] < t) {
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@synchronized(churnLock()) {
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if (condition()) return true;
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}
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[NSRunLoop.currentRunLoop runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01]];
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}
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@synchronized(churnLock()) {
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return condition();
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}
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}
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NSData* increasingData(NSUInteger n) {
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return increasingDataFrom(0, n);
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}
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NSData* increasingDataFrom(NSUInteger offset, NSUInteger n) {
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uint8_t v[n];
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for (NSUInteger i = 0; i < n; i++)
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v[i] = (uint8_t)((i+offset) & 0xFF);
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return [NSData dataWithBytes:v length:n];
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}
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NSData* sineWave(double frequency, double sampleRate, NSUInteger sampleCount) {
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double tau = 6.283;
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int16_t samples[sampleCount];
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for (NSUInteger i = 0; i < sampleCount; i++) {
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samples[i] = (int16_t)(sin(frequency/sampleRate*i*tau)*(1<<15));
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}
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return [NSData dataWithBytes:samples length:sizeof(samples)];
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}
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NSData* generatePseudoRandomData(NSUInteger length) {
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NSMutableData* r = [NSMutableData dataWithLength:length];
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for (int i = 0; i < 16; i++) {
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((uint8_t*)[r mutableBytes])[i] = (uint8_t)arc4random_uniform(256);
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}
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return r;
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}
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