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* The MIT License
* Copyright (c) 2003 Novell Inc. www.novell.com
*
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* of this software and associated documentation files (the Software), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*******************************************************************************/
//
// Novell.Directory.Ldap.Utilclass.Base64.cs
//
// Author:
// Sunil Kumar (Sunilk@novell.com)
//
// (C) 2003 Novell, Inc (http://www.novell.com)
//
using System;
namespace Novell.Directory.Ldap.Utilclass
{
/// <summary> The Base64 utility class performs base64 encoding and decoding.
///
/// The Base64 Content-Transfer-Encoding is designed to represent
/// arbitrary sequences of octets in a form that need not be humanly
/// readable. The encoding and decoding algorithms are simple, but the
/// encoded data are consistently only about 33 percent larger than the
/// unencoded data. The base64 encoding algorithm is defined by
/// RFC 2045.
/// </summary>
public class Base64
{
/// <summary> Checks if the input byte array contains only safe values, that is,
/// the data does not need to be encoded for use with LDIF.
/// The rules for checking safety are based on the rules for LDIF
/// (Ldap Data Interchange Format) per RFC 2849. The data does
/// not need to be encoded if all the following are true:
///
/// The data cannot start with the following byte values:
/// <pre>
/// 00 (NUL)
/// 10 (LF)
/// 13 (CR)
/// 32 (SPACE)
/// 58 (:)
/// 60 (LESSTHAN)
/// Any character with value greater than 127
/// (Negative for a byte value)
/// </pre>
/// The data cannot contain any of the following byte values:
/// <pre>
/// 00 (NUL)
/// 10 (LF)
/// 13 (CR)
/// Any character with value greater than 127
/// (Negative for a byte value)
/// </pre>
/// The data cannot end with a space.
///
/// </summary>
/// <param name="bytes">the bytes to be checked.
///
/// </param>
/// <returns> true if encoding not required for LDIF
/// </returns>
[CLSCompliantAttribute(false)]
public static bool isLDIFSafe(sbyte[] bytes)
{
int len = bytes.Length;
if (len > 0)
{
int testChar = bytes[0];
// unsafe if first character is a NON-SAFE-INIT-CHAR
if ((testChar == 0x00) || (testChar == 0x0A) || (testChar == 0x0D) || (testChar == 0x20) || (testChar == 0x3A) || (testChar == 0x3C) || (testChar < 0))
{
// non ascii (>127 is negative)
return false;
}
// unsafe if last character is a space
if (bytes[len - 1] == ' ')
{
return false;
}
// unsafe if contains any non safe character
if (len > 1)
{
for (int i = 1; i < bytes.Length; i++)
{
testChar = bytes[i];
if ((testChar == 0x00) || (testChar == 0x0A) || (testChar == 0x0D) || (testChar < 0))
{
// non ascii (>127 is negative)
return false;
}
}
}
}
return true;
}
}
}
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