icdsystems/ICD.Common.Utils
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Extension methods for getting upper and lower 4 bits in a byte

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This commit is contained in:
Chris Cameron 2018-03-23 11:59:47 -04:00
parent b00ee4dccb
commit 6b23238162
2 changed files with 60 additions and 40 deletions
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80
ICD.Common.Utils.Tests/Extensions/ByteExtensionsTest.cs
View file

@ -3,41 +3,53 @@ using NUnit.Framework;
namespace ICD.Common.Utils.Tests.Extensions namespace ICD.Common.Utils.Tests.Extensions
{ {
[TestFixture] [TestFixture]
public sealed class ByteExtensionsTest public sealed class ByteExtensionsTest
{ {
[TestCase(false, 0, 0)] [TestCase(false, 0, 0)]
[TestCase(true, 1, 0)] [TestCase(true, 1, 0)]
[TestCase(false, 247, 3)] [TestCase(false, 247, 3)]
[TestCase(true, 255, 3)] [TestCase(true, 255, 3)]
public void GetBitTest(bool expected, byte value, int index) public void GetBitTest(bool expected, byte value, int index)
{ {
Assert.AreEqual(expected, value.GetBit(index)); Assert.AreEqual(expected, value.GetBit(index));
} }
[TestCase(1, 0, 0, true)] [TestCase(1, 0, 0, true)]
[TestCase(0, 1, 0, false)] [TestCase(0, 1, 0, false)]
[TestCase(247, 255, 3, false)] [TestCase(247, 255, 3, false)]
[TestCase(255, 247, 3, true)] [TestCase(255, 247, 3, true)]
public void SetBitTest(byte expected, byte value, int index, bool bitValue) public void SetBitTest(byte expected, byte value, int index, bool bitValue)
{ {
Assert.AreEqual(expected, value.SetBit(index, bitValue)); Assert.AreEqual(expected, value.SetBit(index, bitValue));
} }
[TestCase(1, 0, 0)] [TestCase(1, 0, 0)]
[TestCase(1, 1, 0)] [TestCase(1, 1, 0)]
[TestCase(255, 247, 3)] [TestCase(255, 247, 3)]
public void SetBitOnTest(byte expected, byte value, int index) public void SetBitOnTest(byte expected, byte value, int index)
{ {
Assert.AreEqual(expected, value.SetBitOn(index)); Assert.AreEqual(expected, value.SetBitOn(index));
} }
[TestCase(0, 0, 0)] [TestCase(0, 0, 0)]
[TestCase(0, 1, 0)] [TestCase(0, 1, 0)]
[TestCase(247, 255, 3)] [TestCase(247, 255, 3)]
public void SetBitOffTest(byte expected, byte value, int index) public void SetBitOffTest(byte expected, byte value, int index)
{ {
Assert.AreEqual(expected, value.SetBitOff(index)); Assert.AreEqual(expected, value.SetBitOff(index));
} }
}
[TestCase(0xFF, 0x0F)]
public void GetLower4BitsTest(byte b, byte expected)
{
Assert.AreEqual(expected, b.GetLower4Bits());
}
[TestCase(0xFF, 0xF0)]
public void GetUpper4BitsTest(byte b, byte expected)
{
Assert.AreEqual(expected, b.GetUpper4Bits());
}
}
} }

20
ICD.Common.Utils/Extensions/ByteExtensions.cs
View file

@ -7,22 +7,20 @@ namespace ICD.Common.Utils.Extensions
public static bool GetBit(this byte b, int n) public static bool GetBit(this byte b, int n)
{ {
if (n > 7 || n < 0) if (n > 7 || n < 0)
throw new ArgumentException(); throw new ArgumentOutOfRangeException("n");
return (b & (1 << n)) == (1 << n); return (b & (1 << n)) == (1 << n);
} }
public static byte SetBit(this byte b, int n, bool v) public static byte SetBit(this byte b, int n, bool v)
{ {
if (v) return v ? SetBitOn(b, n) : SetBitOff(b, n);
return SetBitOn(b, n);
return SetBitOff(b, n);
} }
public static byte SetBitOn(this byte b, int n) public static byte SetBitOn(this byte b, int n)
{ {
if (n > 7 || n < 0) if (n > 7 || n < 0)
throw new ArgumentException(); throw new ArgumentOutOfRangeException("n");
return (byte)(b | (1 << n)); return (byte)(b | (1 << n));
} }
@ -30,9 +28,19 @@ namespace ICD.Common.Utils.Extensions
public static byte SetBitOff(this byte b, int n) public static byte SetBitOff(this byte b, int n)
{ {
if (n > 7 || n < 0) if (n > 7 || n < 0)
throw new ArgumentException(); throw new ArgumentOutOfRangeException("n");
return (byte)(b & ~(1 << n)); return (byte)(b & ~(1 << n));
} }
public static byte GetLower4Bits(this byte b)
{
return (byte)(b & 15);
}
public static byte GetUpper4Bits(this byte b)
{
return (byte)(b >> 4);
}
} }
} }