public bool TryDecodeValue(
Globalization.Charset defaultCharset, bool enableFallback, bool allowControlCharacters, bool enable2047, bool enableJisDetection, bool enableUtf8Detection, bool enableDbcsDetection, out string charsetName, out string cultureName,
out EncodingScheme encodingScheme, out string value)
{
charsetName = null;
cultureName = null;
encodingScheme = EncodingScheme.None;
value = null;
var stringBuilder = Internal.ScratchPad.GetStringBuilder(System.Math.Min(1024, iterator.TotalLength));
char[] charBuffer = null;
byte[] byteBuffer = null;
var currentPosition1 = iterator.CurrentPosition;
var whitespaceOnly = false;
var flag1 = false;
if (defaultCharset != null && (enableJisDetection || enableUtf8Detection || enableDbcsDetection && Globalization.FeInboundCharsetDetector.IsSupportedFarEastCharset(defaultCharset))) {
defaultCharset = this.DetectValueCharset(defaultCharset, enableJisDetection, enableUtf8Detection, enableDbcsDetection, out encodingScheme);
flag1 = true;
}
System.Text.Decoder decoder1 = null;
string lastEncodedWordCharsetName = null;
if (!enable2047)
iterator.SkipToEof();
else {
string lastEncodedWordLanguage = null;
Globalization.Charset charset1 = null;
System.Text.Decoder decoder2 = null;
var flag2 = true;
string encodedWordCharsetName;
while (true) {
this.ParseRawFragment(ref whitespaceOnly);
if (!iterator.Eof) {
var currentPosition2 = iterator.CurrentPosition;
string encodedWordLanguage;
byte bOrQ;
ValuePosition encodedWordContentStart;
ValuePosition encodedWordContentEnd;
if (!this.ParseEncodedWord(lastEncodedWordCharsetName, lastEncodedWordLanguage, ref byteBuffer, out encodedWordCharsetName, out encodedWordLanguage, out bOrQ, out encodedWordContentStart, out encodedWordContentEnd))
whitespaceOnly = false;
else {
if (lastEncodedWordCharsetName == null) {
encodingScheme = EncodingScheme.Rfc2047;
charsetName = encodedWordCharsetName;
cultureName = encodedWordLanguage;
}
lastEncodedWordCharsetName = encodedWordCharsetName;
if (currentPosition1 != currentPosition2 && !whitespaceOnly) {
if (!flag2) {
this.FlushDecoder(decoder2, allowControlCharacters, ref byteBuffer, ref charBuffer, stringBuilder);
flag2 = true;
}
if (decoder1 == null) {
if (defaultCharset == null || !defaultCharset.IsAvailable) {
if (!enableFallback)
break;
} else {
decoder1 = defaultCharset.GetEncoding()
.GetDecoder();
}
}
if (decoder1 != null)
this.ConvertRawFragment(currentPosition1, currentPosition2, decoder1, allowControlCharacters, ref charBuffer, stringBuilder);
else
this.ZeroExpandFragment(currentPosition1, currentPosition2, allowControlCharacters, stringBuilder);
}
Globalization.Charset charset2;
if (!Globalization.Charset.TryGetCharset(encodedWordCharsetName, out charset2)) {
if (!flag2) {
this.FlushDecoder(decoder2, allowControlCharacters, ref byteBuffer, ref charBuffer, stringBuilder);
flag2 = true;
}
if (enableFallback)
decoder2 = null;
else
goto label_25;
} else if (charset2 != charset1) {
if (!flag2) {
this.FlushDecoder(decoder2, allowControlCharacters, ref byteBuffer, ref charBuffer, stringBuilder);
flag2 = true;
}
if (!charset2.IsAvailable) {
if (enableFallback)
decoder2 = null;
else
goto label_32;
} else {
decoder2 = charset2.GetEncoding()
.GetDecoder();
charset1 = charset2;
}
}
if (decoder2 != null) {
this.DecodeEncodedWord(bOrQ, decoder2, encodedWordContentStart, encodedWordContentEnd, allowControlCharacters, ref byteBuffer, ref charBuffer, stringBuilder);
flag2 = false;
} else
this.ZeroExpandFragment(currentPosition2, iterator.CurrentPosition, allowControlCharacters, stringBuilder);
currentPosition1 = iterator.CurrentPosition;
whitespaceOnly = true;
}
} else
goto label_39;
}
charsetName = defaultCharset == null ? null : defaultCharset.Name;
return false;
label_25:
charsetName = encodedWordCharsetName;
return false;
label_32:
charsetName = encodedWordCharsetName;
return false;
label_39:
if (!flag2)
this.FlushDecoder(decoder2, allowControlCharacters, ref byteBuffer, ref charBuffer, stringBuilder);
}
if (currentPosition1 != iterator.CurrentPosition) {
if (lastEncodedWordCharsetName == null) {
charsetName = !flag1 || encodingScheme != EncodingScheme.None || (defaultCharset == null || defaultCharset.IsSevenBit) || defaultCharset.AsciiSupport != Globalization.CodePageAsciiSupport.Complete
? (defaultCharset == null ? null : defaultCharset.Name)
: Globalization.Charset.ASCII.Name;
}
if (decoder1 == null) {
if (defaultCharset == null || !defaultCharset.IsAvailable) {
if (!enableFallback) {
charsetName = defaultCharset == null ? null : defaultCharset.Name;
return false;
}
decoder1 = null;
} else {
decoder1 = defaultCharset.GetEncoding()
.GetDecoder();
}
}
if (decoder1 != null)
this.ConvertRawFragment(currentPosition1, iterator.CurrentPosition, decoder1, allowControlCharacters, ref charBuffer, stringBuilder);
else
this.ZeroExpandFragment(currentPosition1, iterator.CurrentPosition, allowControlCharacters, stringBuilder);
}
Internal.ScratchPad.ReleaseStringBuilder();
value = stringBuilder.ToString();
return true;
}