111 lines
4.0 KiB
C#
111 lines
4.0 KiB
C#
// This code is derived from jcifs smb client library <jcifs at samba dot org>
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// Ported by J. Arturo <webmaster at komodosoft dot net>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Text;
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namespace SharpCifs.Util
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{
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public class Base64
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{
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private static readonly string Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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/// <summary>Base-64 encodes the supplied block of data.</summary>
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/// <remarks>
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/// Base-64 encodes the supplied block of data. Line wrapping is not
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/// applied on output.
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/// </remarks>
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/// <param name="bytes">The block of data that is to be Base-64 encoded.</param>
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/// <returns>A <code>String</code> containing the encoded data.</returns>
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public static string Encode(byte[] bytes)
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{
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int length = bytes.Length;
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if (length == 0)
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{
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return string.Empty;
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}
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StringBuilder buffer = new StringBuilder((int)Math.Ceiling(length / 3d) * 4);
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int remainder = length % 3;
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length -= remainder;
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int block;
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int i = 0;
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while (i < length)
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{
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block = ((bytes[i++] & unchecked(0xff)) << 16) | ((bytes[i++] & unchecked(
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0xff)) << 8) | (bytes[i++] & unchecked(0xff));
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buffer.Append(Alphabet[(int)(((uint)block) >> 18)]);
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buffer.Append(Alphabet[((int)(((uint)block) >> 12)) & unchecked(0x3f)]);
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buffer.Append(Alphabet[((int)(((uint)block) >> 6)) & unchecked(0x3f)]);
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buffer.Append(Alphabet[block & unchecked(0x3f)]);
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}
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if (remainder == 0)
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{
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return buffer.ToString();
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}
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if (remainder == 1)
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{
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block = (bytes[i] & unchecked(0xff)) << 4;
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buffer.Append(Alphabet[(int)(((uint)block) >> 6)]);
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buffer.Append(Alphabet[block & unchecked(0x3f)]);
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buffer.Append("==");
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return buffer.ToString();
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}
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block = (((bytes[i++] & unchecked(0xff)) << 8) | ((bytes[i]) & unchecked(0xff))) << 2;
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buffer.Append(Alphabet[(int)(((uint)block) >> 12)]);
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buffer.Append(Alphabet[((int)(((uint)block) >> 6)) & unchecked(0x3f)]);
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buffer.Append(Alphabet[block & unchecked(0x3f)]);
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buffer.Append("=");
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return buffer.ToString();
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}
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/// <summary>Decodes the supplied Base-64 encoded string.</summary>
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/// <remarks>Decodes the supplied Base-64 encoded string.</remarks>
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/// <param name="string">The Base-64 encoded string that is to be decoded.</param>
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/// <returns>A <code>byte[]</code> containing the decoded data block.</returns>
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public static byte[] Decode(string @string)
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{
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int length = @string.Length;
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if (length == 0)
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{
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return new byte[0];
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}
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int pad = (@string[length - 2] == '=') ? 2 : (@string[length - 1] == '=') ? 1 : 0;
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int size = length * 3 / 4 - pad;
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byte[] buffer = new byte[size];
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int block;
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int i = 0;
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int index = 0;
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while (i < length)
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{
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block = (Alphabet.IndexOf(@string[i++]) & unchecked(0xff)) << 18 | (Alphabet
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.IndexOf(@string[i++]) & unchecked(0xff)) << 12 | (Alphabet.IndexOf(@string
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[i++]) & unchecked(0xff)) << 6 | (Alphabet.IndexOf(@string[i++]) & unchecked(
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0xff));
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buffer[index++] = unchecked((byte)((int)(((uint)block) >> 16)));
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if (index < size)
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{
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buffer[index++] = unchecked((byte)(((int)(((uint)block) >> 8)) & unchecked(0xff)));
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}
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if (index < size)
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{
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buffer[index++] = unchecked((byte)(block & unchecked(0xff)));
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}
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}
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return buffer;
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}
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}
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}
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