/// <summary>
/// 全角文字の文字コード(JIS)から文字を取得する
/// </summary>
/// <param name="jiscode">JIS コード</param>
/// <returns>文字(1文字): 取得できない場合は null</returns>
public static string GetCharFromJisCode(int jiscode)
{
(byte high, byte low) = CharCodeUtils.SplitHL(jiscode);
if (0x21 <= high && high <= 0x7e)
{
// OK
}
else
{
return(null);
}
if (0x21 <= low && low <= 0x7e)
{
// OK
}
else
{
return(null);
}
byte[] bistr = new byte[] {
JIS_BEGIN_ESCAPE_SEQUENCE[0],
JIS_BEGIN_ESCAPE_SEQUENCE[1],
JIS_BEGIN_ESCAPE_SEQUENCE[2],
high, low,
JIS_END_ESCAPE_SEQUENCE[0],
JIS_END_ESCAPE_SEQUENCE[1],
JIS_END_ESCAPE_SEQUENCE[2]
};
string result = null;
try {
result = jisEncoding.GetString(bistr);
} catch (Exception ex) {
System.Diagnostics.Debug.WriteLine(ex.Message);
}
return(result);
}
/// <summary>
/// 本文を JIS エンコーディングした MemoryStream を返す
/// NOTE: 半角カタカナは処理できないので渡さないこと
/// </summary>
/// <param name="bodyText">本文</param>
/// <returns>エンコーディング内容を格納した MemoryStream</returns>
private static MemoryStream GetBodyStream(string bodyText)
{
int maxBodyCols;
if (DataBags.Config.ForceInsertLineFeed)
{
maxBodyCols = DataBags.Config.MaxBodyCols * 2;
}
else
{
maxBodyCols = int.MaxValue;
}
MemoryStream stream = new MemoryStream();
int cols = 0;
bool jisIn = false;
for (int i = 0; i < bodyText.Length; ++i)
{
string sch = bodyText.Substring(i, 1);
if (StringUtils.IsAsciiWithControl(sch))
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
jisIn = false;
if (sch[0] == '\n')
{
CharCodeUtils.WriteCrLf(stream);
cols = 0;
}
else
{
char ascii = sch[0];
stream.WriteByte((byte)(ascii & 0xFF));
++cols;
}
}
else
{
if (!jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
jisIn = true;
int jiscode;
Emoji emoji = DataBags.Emojis.GetFromUnicode(sch[0]);
if (emoji != null)
{
jiscode = emoji.Jiscode;
}
else
{
jiscode = CharCodeUtils.GetJisCodeFromChar(sch);
if (jiscode == 0)
{
jiscode = CharCodeUtils.JIS_WHITE_SPACE_CODE;
}
}
(byte high, byte low) = CharCodeUtils.SplitHL(jiscode);
stream.WriteByte(high);
stream.WriteByte(low);
cols += 2;
}
if (maxBodyCols <= cols)
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
CharCodeUtils.WriteCrLfWithFlowed(stream);
if (jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
cols = 0;
}
}
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
return(stream);
}
/// <summary>
/// 件名を固定長に分け、BASE64 エンコーディングして返す
/// NOTE: 改行は処理できないので渡さないこと
/// NOTE: 半角カタカナは処理できないので渡さないこと
/// </summary>
/// <param name="subjectText">件名</param>
/// <param name="maxCols">件名を分けるための長さ</param>
/// <returns>複数の BASE64 文字列の一覧</returns>
private static List <string> GetBase64EncodingBlocks(string subjectText, int maxCols)
{
List <string> base64EncodingBlocks = new List <string>();
MemoryStream stream = new MemoryStream();
int cols = 0;
bool jisIn = false;
for (int i = 0; i < subjectText.Length; ++i)
{
string sch = subjectText.Substring(i, 1);
if (StringUtils.IsAsciiWithControl(sch))
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
jisIn = false;
char ascii = sch[0];
stream.WriteByte((byte)(ascii & 0xFF));
++cols;
}
else
{
if (!jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
jisIn = true;
int jiscode;
Emoji emoji = DataBags.Emojis.GetFromUnicode(sch[0]);
if (emoji != null)
{
jiscode = emoji.Jiscode;
}
else
{
jiscode = CharCodeUtils.GetJisCodeFromChar(sch);
if (jiscode == 0)
{
jiscode = CharCodeUtils.JIS_WHITE_SPACE_CODE;
}
}
(byte high, byte low) = CharCodeUtils.SplitHL(jiscode);
stream.WriteByte(high);
stream.WriteByte(low);
++cols;
}
if (maxCols <= cols)
{
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
base64EncodingBlocks.Add(GetBase64EncodingBlock(stream));
stream = new MemoryStream();
if (jisIn)
{
CharCodeUtils.WriteJisBeginEscapeSequence(stream);
}
cols = 0;
}
}
if (jisIn)
{
CharCodeUtils.WriteJisEndEscapeSequence(stream);
}
if (0 < stream.Length)
{
base64EncodingBlocks.Add(GetBase64EncodingBlock(stream));
}
return(base64EncodingBlocks);
}