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115 lines
2.5 KiB
Objective-C
115 lines
2.5 KiB
Objective-C
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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#import "NumberUtil.h"
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@implementation NumberUtil
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+ (int16_t)congruentDifferenceMod2ToThe16From:(uint16_t)s1 to:(uint16_t)s2 {
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int32_t d = (int32_t)(s2 - s1);
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if (d > INT16_MAX)
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d -= 1 << 16;
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return (int16_t)d;
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}
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+ (int8_t)signOfInt32:(int32_t)value {
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if (value < 0)
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return -1;
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if (value > 0)
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return +1;
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return 0;
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}
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+ (int8_t)signOfDouble:(double)value {
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if (value < 0)
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return -1;
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if (value > 0)
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return +1;
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return 0;
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}
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+ (NSUInteger)largestIntegerThatIsAtMost:(NSUInteger)value andIsAMultipleOf:(NSUInteger)multiple {
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ows_require(multiple != 0);
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NSUInteger d = value / multiple;
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d *= multiple;
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if (d > value)
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d -= multiple;
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return d;
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}
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+ (NSUInteger)smallestIntegerThatIsAtLeast:(NSUInteger)value andIsAMultipleOf:(NSUInteger)multiple {
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ows_require(multiple != 0);
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NSUInteger d = value / multiple;
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d *= multiple;
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if (d < value)
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d += multiple;
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return d;
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}
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+ (double)clamp:(double)value toMin:(double)min andMax:(double)max {
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ows_require(min <= max);
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if (isnan(value)) {
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return max;
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}
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if (value < min) {
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return min;
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}
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if (value > max) {
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return max;
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}
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return value;
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}
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+ (NSUInteger)from:(NSUInteger)value subtractWithSaturationAtZero:(NSUInteger)minusDelta {
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return value - MIN(value, minusDelta);
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}
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+ (uint8_t)uint8FromLowUInt4:(uint8_t)low4UInt4 andHighUInt4:(uint8_t)highUInt4 {
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ows_require(low4UInt4 < 0x10);
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ows_require(highUInt4 < 0x10);
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return low4UInt4 | (uint8_t)(highUInt4 << 4);
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}
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+ (uint8_t)lowUInt4OfUint8:(uint8_t)value {
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return value & 0xF;
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}
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+ (uint8_t)highUInt4OfUint8:(uint8_t)value {
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return value >> 4;
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}
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+ (NSUInteger)assertConvertIntToNSUInteger:(int)value {
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assert(0 <= value);
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return (NSUInteger)value;
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}
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+ (NSInteger)assertConvertUnsignedIntToNSInteger:(unsigned int)value {
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// uint is a subset of NSInteger(long) bounds check is always true
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return (NSInteger)value;
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}
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+ (int)assertConvertNSUIntegerToInt:(NSUInteger)value {
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assert(value <= INT32_MAX);
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return (int)value;
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}
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@end
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@implementation NSNumber (NumberUtil)
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- (bool)hasUnsignedIntegerValue {
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return [self isEqual:@([self unsignedIntegerValue])];
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}
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- (bool)hasUnsignedLongLongValue {
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return [self isEqual:@([self unsignedLongLongValue])];
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}
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- (bool)hasLongLongValue {
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return [self isEqual:@([self longLongValue])];
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}
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@end
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