Add Sha1.ToShortString

Jewelry.Test/Text/Sha1Tests.cs

@@ -1,5 +1,7 @@
 using Xunit;
 using Jewelry.Text;
+using System;
+using System.Collections.Generic;
 
 namespace Jewelry.Test.Text;
 
@@ -14,7 +16,45 @@ public void Parse()
 
         Assert.Equal("a78ca3a164cebb516a6fda68b655b7903a895209", result);
     }
-
+
+    [Theory]
+    [MemberData(nameof(ToShortStringSource))]
+    public void ToShortString(string expected, int length)
+
+    {
+        var sut = new Sha1("a78ca3a164cebb516a6fda68b655b7903a895209");
+
+        var result = sut.ToShortString(length);
+
+        Assert.Equal(expected, result);
+    }
+
+    public static IEnumerable<object[]> ToShortStringSource()
+    {
+        for (var i = 0; i <= 40; ++i)
+            yield return ["a78ca3a164cebb516a6fda68b655b7903a895209"[..i], i];
+    }
+
+    [Fact]
+    public void ToShortString_Under()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(() =>
+        {
+            var sut = new Sha1("a78ca3a164cebb516a6fda68b655b7903a895209");
+            sut.ToShortString(-1);
+        });
+    }
+
+    [Fact]
+    public void ToShortString_Over()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(() =>
+        {
+            var sut = new Sha1("a78ca3a164cebb516a6fda68b655b7903a895209");
+            sut.ToShortString(100);
+        });
+    }
+
     [Fact]
     public void OperatorEquals()
     {
@@ -25,7 +65,7 @@ public void OperatorEquals()
 
         Assert.True(result);
     }
-    
+
     [Fact]
     public void OperatorNotEquals()
     {

Jewelry/Jewelry.csproj

@@ -4,7 +4,7 @@
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
         <PackageLicenseFile>README.md</PackageLicenseFile>
         <Copyright>Copyright (c) 2019-2023 copyright Yoshihiro Ito ([email protected])</Copyright>
-        <Version>2.0.24</Version>
+        <Version>2.0.25</Version>
         <Authors>Yoshihiro Ito</Authors>
         <Company>Jewelry</Company>
         <PackageProjectUrl>https://github.com/YoshihiroIto/Jewelry</PackageProjectUrl>
@@ -13,7 +13,7 @@
         <AssemblyVersion>2.0.0.0</AssemblyVersion>
         <FileVersion>2.0.0.0</FileVersion>
         <Description>.NET support</Description>
-        <PackageVersion>2.0.24</PackageVersion>
+        <PackageVersion>2.0.25</PackageVersion>
         <LangVersion>latest</LangVersion>
         <TargetFrameworks>net7.0;net8.0</TargetFrameworks>
     </PropertyGroup>

Jewelry/Text/Sha1.cs

@@ -35,6 +35,43 @@ public override string ToString()
             }
         });
     }
+
+    public string ToShortString(int length)
+    {
+        if (length < 0)
+            throw new ArgumentOutOfRangeException();
+
+        if (length > 40)
+            throw new ArgumentOutOfRangeException();
+
+        if (length == 0)
+            return "";
+
+        return string.Create(length, this, static (span, t) =>
+        {
+            var count = 0;
+
+            for (var i = 0; i != 32; i++)
+            {
+                var c = (t._value0 >> ((31 - i) * 4)) & 0x0F;
+                span[i] = c < 10 ? (char)('0' + c) : (char)('a' + c - 10);
+
+                ++count;
+                if(count == span.Length)
+                    return;
+            }
+
+            for (var i = 0; i != 8; i++)
+            {
+                var c = (t._value1 >> ((7 - i) * 4)) & 0x0F;
+                span[32 + i] = c < 10 ? (char)('0' + c) : (char)('a' + c - 10);
+
+                ++count;
+                if(count == span.Length)
+                    return;
+            }
+        });
+    }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static bool operator ==(Sha1 left, Sha1 right)