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