/// <summary>
/// Decodes data from Base64 notation, automatically
/// detecting gzip-compressed data and decompressing it.
/// </summary>
/// <remarks>
/// Decodes data from Base64 notation, automatically
/// detecting gzip-compressed data and decompressing it.
/// </remarks>
/// <param name="s">the string to decode</param>
/// <param name="options">encode options such as URL_SAFE</param>
/// <returns>the decoded data</returns>
/// <exception cref="System.IO.IOException">if there is an error</exception>
/// <exception cref="System.ArgumentNullException">if <tt>s</tt> is null</exception>
/// <since>1.4</since>
public static byte[] Decode(string s, int options)
{
if (s == null)
{
throw new ArgumentNullException("Input string was null.");
}
// end if
byte[] bytes;
try
{
bytes = Sharpen.Runtime.GetBytesForString(s, PreferredEncoding);
}
catch (UnsupportedEncodingException)
{
// end try
bytes = Sharpen.Runtime.GetBytesForString(s);
}
// end catch
//</change>
// Decode
bytes = Decode(bytes, 0, bytes.Length, options);
// Check to see if it's gzip-compressed
// GZIP Magic Two-Byte Number: 0x8b1f (35615)
bool dontGunzip = (options & DontGunzip) != 0;
if ((bytes != null) && (bytes.Length >= 4) && (!dontGunzip))
{
int head = ((int)bytes[0] & unchecked((int)(0xff))) | ((bytes[1] << 8) & unchecked(
(int)(0xff00)));
if (GZIPInputStream.GzipMagic == head)
{
ByteArrayInputStream bais = null;
GZIPInputStream gzis = null;
ByteArrayOutputStream baos = null;
byte[] buffer = new byte[2048];
int length = 0;
try
{
baos = new ByteArrayOutputStream();
bais = new ByteArrayInputStream(bytes);
gzis = new GZIPInputStream(bais);
while ((length = gzis.Read(buffer)) >= 0)
{
baos.Write(buffer, 0, length);
}
// end while: reading input
// No error? Get new bytes.
bytes = baos.ToByteArray();
}
catch (IOException e)
{
// end try
Sharpen.Runtime.PrintStackTrace(e);
}
finally
{
// Just return originally-decoded bytes
// end catch
try
{
baos.Close();
}
catch (Exception)
{
}
try
{
gzis.Close();
}
catch (Exception)
{
}
try
{
bais.Close();
}
catch (Exception)
{
}
}
}
}
// end finally
// end if: gzipped
// end if: bytes.length >= 2
return bytes;
}
