First part of dotnet library

committer: Jon Skeet <skeet@pobox.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/csharp/ProtocolBuffers/ByteString.cs b/csharp/ProtocolBuffers/ByteString.cs
new file mode 100644
index 00000000..1ce2453e
--- /dev/null
+++ b/csharp/ProtocolBuffers/ByteString.cs
@@ -0,0 +1,96 @@
+using System.Text;
+using System;
+
+namespace Google.ProtocolBuffers {
+  /// <summary>
+  /// Immutable array of bytes.
+  /// TODO(jonskeet): Implement the common collection interfaces?
+  /// </summary>
+  public sealed class ByteString {
+
+    private static readonly ByteString empty = new ByteString(new byte[0]);
+
+    private byte[] bytes;
+
+    /// <summary>
+    /// Constructs a new ByteString from the given byte array. The array is
+    /// *not* copied, and must not be modified after this constructor is called.
+    /// </summary>
+    private ByteString(byte[] bytes) {
+      this.bytes = bytes;
+    }
+
+    /// <summary>
+    /// Returns an empty ByteString.
+    /// </summary>
+    public static ByteString Empty {
+      get { return empty; }
+    }
+
+    /// <summary>
+    /// Returns the length of this ByteString in bytes.
+    /// </summary>
+    public int Length {
+      get { return bytes.Length; }
+    }
+
+    public bool IsEmpty {
+      get { return Length == 0; }
+    }
+
+    public byte[] ToByteArray() {
+      return (byte[])bytes.Clone();
+    }
+
+    /// <summary>
+    /// Constructs a ByteString from the given array. The contents
+    /// are copied, so further modifications to the array will not
+    /// be reflected in the returned ByteString.
+    /// </summary>
+    public static ByteString CopyFrom(byte[] bytes) {
+      return new ByteString((byte[]) bytes.Clone());
+    }
+
+    /// <summary>
+    /// Constructs a ByteString from a portion of a byte array.
+    /// </summary>
+    public static ByteString CopyFrom(byte[] bytes, int offset, int count) {
+      byte[] portion = new byte[count];
+      Array.Copy(bytes, offset, portion, 0, count);
+      return new ByteString(portion);
+    }
+
+    /// <summary>
+    /// Creates a new ByteString by encoding the specified text with
+    /// the given encoding.
+    /// </summary>
+    public static ByteString CopyFrom(string text, Encoding encoding) {
+      return new ByteString(encoding.GetBytes(text));
+    }
+
+    /// <summary>
+    /// Creates a new ByteString by encoding the specified text in UTF-8.
+    /// </summary>
+    public static ByteString CopyFromUtf8(string text) {
+      return CopyFrom(text, Encoding.UTF8);
+    }
+    
+    /// <summary>
+    /// Retuns the byte at the given index.
+    /// </summary>
+    public byte this[int index] {
+      get { return bytes[index]; }
+    }
+
+    public string ToString(Encoding encoding) {
+      return encoding.GetString(bytes);
+    }
+
+    public string ToStringUtf8() {
+      return ToString(Encoding.UTF8);
+    }
+
+    // TODO(jonskeet): CopyTo, Equals, GetHashCode if they turn out to be required
+    // TODO(jonskeet): Input/Output stuff
+  }
+}