initial commit

.gitignore

@@ -0,0 +1,2 @@
+bin/
+obj/

Base/ChecksumInfo.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using Heleus.Cryptography;
+
+namespace Heleus.Base
+{
+    public class ChecksumInfo
+    {
+        class Item
+        {
+            public readonly string Name;
+            public readonly Hash Checksum;
+
+            public Item(string name, Hash checksum)
+            {
+                Name = name;
+                Checksum = checksum;
+            }
+
+            public Item(Unpacker unpacker)
+            {
+                unpacker.Unpack(out Name);
+                unpacker.Unpack(out Checksum);
+            }
+
+            public void Pack(Packer packer)
+            {
+                packer.Pack(Name);
+                packer.Pack(Checksum);
+            }
+        }
+
+        readonly List<Item> items = new List<Item>();
+
+        public ChecksumInfo()
+        {
+
+        }
+
+        public ChecksumInfo(Unpacker unpacker)
+        {
+            var count = unpacker.UnpackInt();
+            for (var i = 0; i < count; i++)
+                items.Add(new Item(unpacker));
+        }
+
+        public ChecksumInfo(byte[] checksumData)
+        {
+            using (var unpacker = new Unpacker(checksumData))
+            {
+                var count = unpacker.UnpackInt();
+                for (var i = 0; i < count; i++)
+                    items.Add(new Item(unpacker));
+            }
+        }
+
+        public ChecksumInfo Add(string name, Hash checksum)
+        {
+            items.Add(new Item(name, checksum));
+            return this;
+        }
+
+        public Hash Get(string name)
+        {
+            foreach (var item in items)
+            {
+                if (item.Name == name)
+                    return item.Checksum;
+            }
+            return null;
+        }
+
+        public bool Valid(string name, byte[] data)
+        {
+            var hash = Get(name);
+            if(hash != null)
+            {
+                var newHash = Hash.Generate(hash.HashType, data);
+                return hash == newHash;
+            }
+            return false;
+        }
+
+        public bool Valid(string name, Stream data)
+        {
+            var hash = Get(name);
+            if (hash != null)
+            {
+                var newHash = Hash.Generate(hash.HashType, data);
+                return hash == newHash;
+            }
+            return false;
+        }
+
+        public void Pack(Packer packer)
+        {
+            packer.Pack(items.Count);
+            foreach (var item in items)
+                item.Pack(packer);
+        }
+
+        public byte[] ToArray()
+        {
+            using(var packer = new Packer())
+            {
+                Pack(packer);
+                return packer.ToByteArray();
+            }
+        }
+    }
+}