/// <summary>
/// Decoded and merges all the token from the specified list.
/// </summary>
public void Decode()
{
StringBuilder sb = new StringBuilder();
EncodedWord previousEncodedWord = null;
foreach (EncodedWord encodedWord in _encodedWords)
{
string value = encodedWord.ReadableValue;
if (encodedWord.IsEncoded)
{
if (previousEncodedWord != null)
{
if (!previousEncodedWord.IsEncoded)
{
value = encodedWord.Prefix + value;
}
}
}
sb.Append(value);
previousEncodedWord = encodedWord;
}
_decoded = sb.ToString();
}
/// <summary>
/// Determines if the current encoded word has the same encoding name and encoding type
/// </summary>
public bool IsCompatibleWith(EncodedWord other)
{
if (!IsEncoded || !other.IsEncoded)
{
return(false);
}
return(string.Equals(EncodingName, other.EncodingName, StringComparison.InvariantCultureIgnoreCase) &&
string.Equals(EncodingType, other.EncodingType, StringComparison.InvariantCultureIgnoreCase));
}
/// <summary>
/// Determines if the next token in the list (if any) match the encoded word regular expression and has the same encoding and charset values
/// </summary>
private bool NextTokenIsCompatible(EncodedWord encodedWord, int currentIndex)
{
if (currentIndex + 1 >= _encodedWords.Count)
{
return(false);
}
var nextEncodedWord = _encodedWords[currentIndex + 1];
return(encodedWord.IsCompatibleWith(nextEncodedWord));
}
/// <summary>
/// Ctor
/// </summary>
public EncodedWords(string value)
{
if (string.IsNullOrWhiteSpace(value))
{
_decoded = null;
}
else
{
_encodedWords = EncodedWord.Parse(value);
MergeContiguousCompatibleEncodedTokens();
Decode();
}
}
/// <summary>
/// Merges together two encoded words and returns the correct encoded word string that will match the regular expression
/// </summary>
private string MergeEncodedValues(EncodedWord encodedWord)
{
string encodedData1 = EncodedData;
string encodedData2 = encodedWord.EncodedData;
string encodingType = EncodingType;
string encodedData;
if (encodingType == "B")
{
byte[] decodedData1 = Convert.FromBase64String(encodedData1);
byte[] decodedData2 = Convert.FromBase64String(encodedData2);
encodedData = Convert.ToBase64String(decodedData1.Concat(decodedData2).ToArray());
}
else
{
encodedData = encodedData1 + encodedData2;
}
return(string.Format("=?{0}?{1}?{2}?=", EncodingName, encodingType, encodedData));
}
/// <summary>
/// If happens that when having multiple contiguous encoded words (specially binary, an encoded word is splitted on a byte boundary example : C3 A9
/// represents the à character and the first encoded word can contain the C3 and the second encoded word contains A0. This method with modify
/// the list of tokens so when the same encoding and charset are used for multiple tokens, they will be merge together
/// </summary>
private void MergeContiguousCompatibleEncodedTokens()
{
bool doneSomeThing = false;
do
{
doneSomeThing = false;
for (int i = 0; i < _encodedWords.Count; i++)
{
var encodedWord = _encodedWords[i];
if (NextTokenIsCompatible(encodedWord, i))
{
EncodedWord nextEncodedWord = _encodedWords[i + 1];
encodedWord.Merge(nextEncodedWord);
_encodedWords.RemoveAt(i + 1);
doneSomeThing = true;
break;
}
}
} while (doneSomeThing);
}
/// <summary>
/// Merges together two encoded words and returns the correct encoded word string that will match the regular expression
/// </summary>
private string MergeEncodedValues(EncodedWord encodedWord)
{
string encodedData1 = EncodedData;
string encodedData2 = encodedWord.EncodedData;
string encodingType = EncodingType;
string encodedData;
if (encodingType == "B")
{
byte[] decodedData1 = Convert.FromBase64String(encodedData1);
byte[] decodedData2 = Convert.FromBase64String(encodedData2);
encodedData = Convert.ToBase64String(decodedData1.Concat(decodedData2).ToArray());
}
else
{
encodedData = encodedData1 + encodedData2;
}
return string.Format("=?{0}?{1}?{2}?=", EncodingName, encodingType, encodedData);
}
/// <summary>
/// Merges the specified encoded word into this instance.
///
/// This method assumes the encoded words are compatible
/// </summary>
public void Merge(EncodedWord encodedWord)
{
Value = MergeEncodedValues(encodedWord);
Match = _singleEncodedWordsPattern.Match(Value);
}
/// <summary>
/// Determines if the current encoded word has the same encoding name and encoding type
/// </summary>
public bool IsCompatibleWith(EncodedWord other)
{
if (!IsEncoded || !other.IsEncoded)
{
return false;
}
return string.Equals(EncodingName, other.EncodingName, StringComparison.InvariantCultureIgnoreCase) &&
string.Equals(EncodingType, other.EncodingType, StringComparison.InvariantCultureIgnoreCase);
}
/// <summary>
/// Merges the specified encoded word into this instance.
///
/// This method assumes the encoded words are compatible
/// </summary>
public void Merge(EncodedWord encodedWord)
{
Value = MergeEncodedValues(encodedWord);
Match = _singleEncodedWordsPattern.Match(Value);
}
/// <summary>
/// Determines if the next token in the list (if any) match the encoded word regular expression and has the same encoding and charset values
/// </summary>
private bool NextTokenIsCompatible(EncodedWord encodedWord, int currentIndex)
{
if (currentIndex + 1 >= _encodedWords.Count)
{
return false;
}
var nextEncodedWord = _encodedWords[currentIndex + 1];
return encodedWord.IsCompatibleWith(nextEncodedWord);
}
