diff options
Diffstat (limited to 'Emby.Server.Implementations/IO/SharpCifs/Util/Base64.cs')
| -rw-r--r-- | Emby.Server.Implementations/IO/SharpCifs/Util/Base64.cs | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/IO/SharpCifs/Util/Base64.cs b/Emby.Server.Implementations/IO/SharpCifs/Util/Base64.cs new file mode 100644 index 000000000..4770f1354 --- /dev/null +++ b/Emby.Server.Implementations/IO/SharpCifs/Util/Base64.cs @@ -0,0 +1,110 @@ +// This code is derived from jcifs smb client library <jcifs at samba dot org> +// Ported by J. Arturo <webmaster at komodosoft dot net> +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +using System; +using System.Text; + +namespace SharpCifs.Util +{ + public class Base64 + { + private static readonly string Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + + /// <summary>Base-64 encodes the supplied block of data.</summary> + /// <remarks> + /// Base-64 encodes the supplied block of data. Line wrapping is not + /// applied on output. + /// </remarks> + /// <param name="bytes">The block of data that is to be Base-64 encoded.</param> + /// <returns>A <code>String</code> containing the encoded data.</returns> + public static string Encode(byte[] bytes) + { + int length = bytes.Length; + if (length == 0) + { + return string.Empty; + } + StringBuilder buffer = new StringBuilder((int)Math.Ceiling(length / 3d) * 4); + int remainder = length % 3; + length -= remainder; + int block; + int i = 0; + while (i < length) + { + block = ((bytes[i++] & unchecked(0xff)) << 16) | ((bytes[i++] & unchecked( + 0xff)) << 8) | (bytes[i++] & unchecked(0xff)); + buffer.Append(Alphabet[(int)(((uint)block) >> 18)]); + buffer.Append(Alphabet[((int)(((uint)block) >> 12)) & unchecked(0x3f)]); + buffer.Append(Alphabet[((int)(((uint)block) >> 6)) & unchecked(0x3f)]); + buffer.Append(Alphabet[block & unchecked(0x3f)]); + } + if (remainder == 0) + { + return buffer.ToString(); + } + if (remainder == 1) + { + block = (bytes[i] & unchecked(0xff)) << 4; + buffer.Append(Alphabet[(int)(((uint)block) >> 6)]); + buffer.Append(Alphabet[block & unchecked(0x3f)]); + buffer.Append("=="); + return buffer.ToString(); + } + block = (((bytes[i++] & unchecked(0xff)) << 8) | ((bytes[i]) & unchecked(0xff))) << 2; + buffer.Append(Alphabet[(int)(((uint)block) >> 12)]); + buffer.Append(Alphabet[((int)(((uint)block) >> 6)) & unchecked(0x3f)]); + buffer.Append(Alphabet[block & unchecked(0x3f)]); + buffer.Append("="); + return buffer.ToString(); + } + + /// <summary>Decodes the supplied Base-64 encoded string.</summary> + /// <remarks>Decodes the supplied Base-64 encoded string.</remarks> + /// <param name="string">The Base-64 encoded string that is to be decoded.</param> + /// <returns>A <code>byte[]</code> containing the decoded data block.</returns> + public static byte[] Decode(string @string) + { + int length = @string.Length; + if (length == 0) + { + return new byte[0]; + } + int pad = (@string[length - 2] == '=') ? 2 : (@string[length - 1] == '=') ? 1 : 0; + int size = length * 3 / 4 - pad; + byte[] buffer = new byte[size]; + int block; + int i = 0; + int index = 0; + while (i < length) + { + block = (Alphabet.IndexOf(@string[i++]) & unchecked(0xff)) << 18 | (Alphabet + .IndexOf(@string[i++]) & unchecked(0xff)) << 12 | (Alphabet.IndexOf(@string + [i++]) & unchecked(0xff)) << 6 | (Alphabet.IndexOf(@string[i++]) & unchecked( + 0xff)); + buffer[index++] = unchecked((byte)((int)(((uint)block) >> 16))); + if (index < size) + { + buffer[index++] = unchecked((byte)(((int)(((uint)block) >> 8)) & unchecked(0xff))); + } + if (index < size) + { + buffer[index++] = unchecked((byte)(block & unchecked(0xff))); + } + } + return buffer; + } + } +} |