仿真平台内核初版 -tlib库 包含<sparc arm riscv powerPC>

lib/InpliTftpServer/libtftp/helpers/BufferPrimitives.cs

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+// Telenor Inpli TFTP Server Module
+//
+// Copyright 2018 Telenor Inpli AS Norway
+
+using System;
+
+internal static class BufferPrimitives
+{
+    /// <summary>
+    /// Read a 16-bit big endian value from a buffer at a given offset
+    /// </summary>
+    /// <param name="buffer">The buffer to read from</param>
+    /// <param name="offset">The offset in the buffer</param>
+    /// <returns>A 16 bit value</returns>
+    /// <exception cref="IndexOutOfRangeException">If reading past the end of the buffer</exception>
+    public static int Get16BE(this byte [] buffer, long offset)
+    {
+        if ((offset + 2) >= buffer.Length)
+            throw new IndexOutOfRangeException();
+
+        return ((int)(buffer[offset]) << 8) | (int)buffer[offset+1];
+    }
+
+    /// <summary>
+    /// Writes a 16-bit big endian to a buffer at a given offset
+    /// </summary>
+    /// <param name="buffer">The buffer to write into</param>
+    /// <param name="offset">The offset within the buffer to write to</param>
+    /// <param name="value">The value to write</param>
+    /// <exception cref="IndexOutOfRangeException">If attempting to write past the end</exception>
+    public static void Write16BE(this byte [] buffer, long offset, int value)
+    {
+        if ((offset + 2) >= buffer.Length)
+            throw new IndexOutOfRangeException();
+
+        buffer[offset] = (byte)((value >> 8) & 0xff);
+        buffer[offset + 1] = (byte)(value & 0xff);
+    }
+}