/// <summary>
/// ヘッダ文字列から件名を取得する
/// NOTE: 自分で出力した形式にしか対応していない
/// </summary>
/// <param name="headers">ヘッダ文字列</param>
/// <returns>件名</returns>
private static string GetSubjectText(string headers)
{
int startIndex = headers.IndexOf(MailMessage.SUBJECT, 0, StringComparison.CurrentCultureIgnoreCase);
if (startIndex < 0)
{
return("");
}
startIndex += MailMessage.SUBJECT.Length;
int index = startIndex;
int endIndex = startIndex;
while (true)
{
index = headers.IndexOf("\r\n", index);
if (index < 0)
{
break;
}
if (headers.Length <= index + 2)
{
break;
}
endIndex = index;
if (headers[index + 2] != ' ' && headers[index + 2] != '\t')
{
break;
}
index += 2;
}
if (endIndex == startIndex)
{
return("");
}
string subject = headers.Substring(startIndex, endIndex - startIndex);
Regex regex = new Regex(@"=\?(?<charset>.*?)\?(?<encoding>.)\?(?<value>.*?)\?=");
StringBuilder result = new StringBuilder();
MatchCollection matchCollection = regex.Matches(subject);
foreach (Match match in matchCollection)
{
if (match.Success)
{
string charset = match.Groups["charset"].Value.ToLower();
string encoding = match.Groups["encoding"].Value.ToLower();
string val = match.Groups["value"].Value;
if (charset == "iso-2022-jp" && encoding == "b")
{
// OK
}
else
{
// 未対応
return("");
}
byte[] dataPart = Convert.FromBase64String(val);
bool inJpn = false;
int dataPartLength = dataPart.Length;
for (int i = 0; i < dataPartLength;)
{
if (CharCodeUtils.IsBeginEscapeSequence(dataPart, i))
{
inJpn = true;
i += 3;
continue;
}
if (CharCodeUtils.IsEndEscapeSequence(dataPart, i))
{
inJpn = false;
i += 3;
continue;
}
if (inJpn)
{
if (i <= dataPartLength - 2)
{
int jiscode = CharCodeUtils.MergeHL(dataPart[i], dataPart[i + 1]);
Emoji emoji = DataBags.Emojis.GetFromJiscode(jiscode);
if (emoji != null)
{
result.Append(emoji.Unicode);
}
else
{
string sch = CharCodeUtils.GetCharFromJisCode(jiscode);
if (sch != null)
{
result.Append(sch);
}
}
i += 2;
}
else
{
i += 1;
}
}
else
{
char ascii = (char)dataPart[i];
result.Append(ascii);
i += 1;
}
}
}
}
return(result.ToString());
}
/// <summary>
/// ボディ部データから本文を取得する
/// NOTE: 自分で出力した形式にしか対応していない
/// </summary>
/// <param name="data">ボディ部データ</param>
/// <param name="offset">オフセット</param>
/// <returns>本文</returns>
private static string GetBodyText(byte[] data, int offset)
{
bool inJpn = false;
int dataLength = data.Length;
StringBuilder result = new StringBuilder();
for (int i = offset; i < dataLength;)
{
if (CharCodeUtils.IsCrLf(data, i))
{
inJpn = false;
i += 2;
result.Append("\r\n");
continue;
}
if (CharCodeUtils.IsBeginEscapeSequence(data, i))
{
inJpn = true;
i += 3;
continue;
}
if (CharCodeUtils.IsEndEscapeSequence(data, i))
{
inJpn = false;
i += 3;
continue;
}
if (inJpn)
{
if (i <= dataLength - 2)
{
int jiscode = CharCodeUtils.MergeHL(data[i], data[i + 1]);
Emoji emoji = DataBags.Emojis.GetFromJiscode(jiscode);
if (emoji != null)
{
result.Append(emoji.Unicode);
}
else
{
string sch = CharCodeUtils.GetCharFromJisCode(jiscode);
if (sch != null)
{
result.Append(sch);
}
}
i += 2;
}
else
{
i += 1;
}
}
else
{
char ascii = (char)data[i];
result.Append(ascii);
i += 1;
}
}
return(result.ToString());
}
