Initial commit to populate CoreCLR repo

[tfs-changeset: 1407945]

1 files changed, 80 insertions, 0 deletions

diff --git a/src/vm/decodemd.h b/src/vm/decodemd.h
new file mode 100644
index 0000000000..c76bdddb53
--- /dev/null
+++ b/src/vm/decodemd.h
@@ -0,0 +1,80 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+
+
+#ifndef __DECODEMD_H__
+#define __DECODEMD_H__
+
+// --------------------------------------------------------
+// This is used to decode a bitstream encoding
+
+class Decoder
+{
+public:
+    Decoder();
+    Decoder(PTR_BYTE bytes);
+    void Init(PTR_BYTE bytes);
+    unsigned Next();
+    signed NextSigned();
+    PTR_BYTE End();
+    
+    // --------------------------------------------------------
+    // This structures contains the state of the FSM
+
+    struct Decode
+    {
+        const BYTE* decoded;    //the already decoded values
+        unsigned  next;   //what to do when no more decoded values
+    };
+
+private:
+    // --------------------------------------------------------
+    // This is used to access nibbles from a byte stream.
+
+    class Nibbles
+    {
+        friend class Decoder;
+    public:
+        void SetContents(PTR_BYTE bytes);
+        BYTE Next();
+        BYTE Read();
+        unsigned Bits(unsigned number);
+    private:
+        PTR_BYTE data;
+        BYTE nibbles[2];
+        unsigned next;
+    };
+
+    Decode state;
+    Nibbles data;
+};
+
+// --------------------------------------------------------
+// This is used to encode a bitstream encoding
+#ifndef BINDER
+class Encoder
+{
+public:
+    Encoder(BYTE *buffer);
+    void ContainsNegatives(BOOL b);
+    void EncodeSigned(signed value);
+    void Encode(unsigned value);
+    void Encode(signed value, BOOL isSigned);
+    void Add(unsigned value, unsigned length);
+    void Add64(unsigned __int64 value, unsigned length);
+    void Done();
+    unsigned Contents(BYTE** contents);
+    unsigned Length();
+private:
+    BYTE* buffer;
+    BYTE encoding;
+    unsigned unusedBits;
+    BOOL done;
+    BOOL signedNumbers;
+    unsigned index;
+};
+#endif // !BINDER
+#endif // __DECODEMD_H__