MimeMultipart
* objects.
*
* MimeBodyPart uses the InternetHeaders class to parse
* and store the headers of that body part.
* *
*
* RFC 822 header fields must contain only
* US-ASCII characters. MIME allows non ASCII characters to be present
* in certain portions of certain headers, by encoding those characters.
* RFC 2047 specifies the rules for doing this. The MimeUtility
* class provided in this package can be used to to achieve this.
* Callers of the setHeader, addHeader, and
* addHeaderLine methods are responsible for enforcing
* the MIME requirements for the specified headers. In addition, these
* header fields must be folded (wrapped) before being sent if they
* exceed the line length limitation for the transport (1000 bytes for
* SMTP). Received headers may have been folded. The application is
* responsible for folding and unfolding headers as appropriate.
*
* @author John Mani
* @author Bill Shannon
* @see MimeUtility
*/
public final class MimeBodyPart {
/**
* This part should be presented as an attachment.
* @see #getDisposition
* @see #setDisposition
*/
public static final String ATTACHMENT = "attachment";
/**
* This part should be presented inline.
* @see #getDisposition
* @see #setDisposition
*/
public static final String INLINE = "inline";
// Paranoia:
// allow this last minute change to be disabled if it causes problems
private static boolean setDefaultTextCharset = true;
static {
try {
String s = System.getProperty("mail.mime.setdefaulttextcharset");
// default to true
setDefaultTextCharset = s == null || !s.equalsIgnoreCase("false");
} catch (SecurityException sex) {
// ignore it
}
}
/*
Data is represented in one of three forms.
Either we have a DataHandler, or byte[] as the raw content image, or the contentStream.
It's OK to have more than one of them, provided that they are identical.
*/
/**
* The DataHandler object representing this MimeBodyPart's content.
*/
private DataHandler dh;
/**
* Byte array that holds the bytes of the content of this MimeBodyPart.
* Used in a pair with {@link #contentLength} to denote a regision of a buffer
* as a valid data.
*/
private byte[] content;
private int contentLength;
private int start = 0;
/**
* If the data for this body part was supplied by an
* InputStream that implements the SharedInputStream interface,
* contentStream is another such stream representing
* the content of this body part. In this case, content
* will be null.
*
* @since JavaMail 1.2
*/
private InputStream contentStream;
/**
* The InternetHeaders object that stores all the headers
* of this body part.
*/
private final InternetHeaders headers;
/**
* The MimeMultipart object containing this MimeBodyPart,
* if known.
* @since JavaMail 1.1
*/
private MimeMultipart parent;
private MIMEPart mimePart;
/**
* An empty MimeBodyPart object is created.
* This body part maybe filled in by a client constructing a multipart
* message.
*/
public MimeBodyPart() {
headers = new InternetHeaders();
}
/**
* Constructs a MimeBodyPart by reading and parsing the data from
* the specified input stream. The parser consumes data till the end
* of the given input stream. The input stream must start at the
* beginning of a valid MIME body part and must terminate at the end
* of that body part.
* * Note that the "boundary" string that delimits body parts must * not be included in the input stream. The intention * is that the MimeMultipart parser will extract each body part's bytes * from a multipart stream and feed them into this constructor, without * the delimiter strings. * * @param is the body part Input Stream */ public MimeBodyPart(InputStream is) throws MessagingException { if (!(is instanceof ByteArrayInputStream) && !(is instanceof BufferedInputStream) && !(is instanceof SharedInputStream)) is = new BufferedInputStream(is); headers = new InternetHeaders(is); if (is instanceof SharedInputStream) { SharedInputStream sis = (SharedInputStream) is; contentStream = sis.newStream(sis.getPosition(), -1); } else { ByteOutputStream bos = null; try { bos = new ByteOutputStream(); bos.write(is); content = bos.getBytes(); contentLength = bos.getCount(); } catch (IOException ioex) { throw new MessagingException("Error reading input stream", ioex); } finally { if (bos != null) bos.close(); } } } /** * Constructs a MimeBodyPart using the given header and * content bytes.
*
* Used by providers.
*
* @param headers The header of this part
* @param content bytes representing the body of this part.
*/
public MimeBodyPart(InternetHeaders headers, byte[] content, int len) {
this.headers = headers;
this.content = content;
this.contentLength = len;
}
public MimeBodyPart(
InternetHeaders headers, byte[] content, int start, int len) {
this.headers = headers;
this.content = content;
this.start = start;
this.contentLength = len;
}
public MimeBodyPart(MIMEPart part) {
mimePart = part;
headers = new InternetHeaders();
List hdrs = mimePart.getAllHeaders();
for (com.sun.xml.internal.org.jvnet.mimepull.Header hd : hdrs) {
headers.addHeader(hd.getName(), hd.getValue());
}
}
/**
* Return the containing MimeMultipart object,
* or null if not known.
*/
public MimeMultipart getParent() {
return parent;
}
/**
* Set the parent of this MimeBodyPart to be the specified
* MimeMultipart. Normally called by MimeMultipart's
* addBodyPart method. parent may be
* null if the MimeBodyPart is being removed
* from its containing MimeMultipart.
* @since JavaMail 1.1
*/
public void setParent(MimeMultipart parent) {
this.parent = parent;
}
/**
* Return the size of the content of this body part in bytes.
* Return -1 if the size cannot be determined.
* * Note that this number may not be an exact measure of the * content size and may or may not account for any transfer * encoding of the content.
*
* This implementation returns the size of the content
* array (if not null), or, if contentStream is not
* null, and the available method returns a positive
* number, it returns that number as the size. Otherwise, it returns
* -1.
*
* @return size in bytes, or -1 if not known
*/
public int getSize() {
if (mimePart != null) {
try {
return mimePart.read().available();
} catch (IOException ex) {
return -1;
}
}
if (content != null)
return contentLength;
if (contentStream != null) {
try {
int size = contentStream.available();
// only believe the size if it's greate than zero, since zero
// is the default returned by the InputStream class itself
if (size > 0)
return size;
} catch (IOException ex) {
// ignore it
}
}
return -1;
}
/**
* Return the number of lines for the content of this MimeBodyPart.
* Return -1 if this number cannot be determined.
* * Note that this number may not be an exact measure of the * content length and may or may not account for any transfer * encoding of the content.
* * This implementation returns -1. * * @return number of lines, or -1 if not known */ public int getLineCount() { return -1; } /** * Returns the value of the RFC 822 "Content-Type" header field. * This represents the content type of the content of this * body part. This value must not be null. If this field is * unavailable, "text/plain" should be returned.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*
* @return Content-Type of this body part
*/
public String getContentType() {
if (mimePart != null) {
return mimePart.getContentType();
}
String s = getHeader("Content-Type", null);
if (s == null)
s = "text/plain";
return s;
}
/**
* Is this MimeBodyPart of the specified MIME type? This method
* compares only the primaryType and
* subType.
* The parameters of the content types are ignored.
*
* For example, this method will return true when
* comparing a MimeBodyPart of content type "text/plain"
* with "text/plain; charset=foobar".
*
* If the subType of mimeType is the
* special character '*', then the subtype is ignored during the
* comparison.
*/
public boolean isMimeType(String mimeType) {
boolean result;
// XXX - lots of room for optimization here!
try {
ContentType ct = new ContentType(getContentType());
result = ct.match(mimeType);
} catch (ParseException ex) {
result = getContentType().equalsIgnoreCase(mimeType);
}
return result;
}
/**
* Returns the value of the "Content-Disposition" header field.
* This represents the disposition of this part. The disposition
* describes how the part should be presented to the user.
* * If the Content-Disposition field is unavailable, * null is returned.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*
* @see #headers
*/
public String getDisposition() throws MessagingException {
String s = getHeader("Content-Disposition", null);
if (s == null)
return null;
ContentDisposition cd = new ContentDisposition(s);
return cd.getDisposition();
}
/**
* Set the "Content-Disposition" header field of this body part.
* If the disposition is null, any existing "Content-Disposition"
* header field is removed.
*
* @exception IllegalStateException if this body part is
* obtained from a READ_ONLY folder.
*/
public void setDisposition(String disposition) throws MessagingException {
if (disposition == null)
removeHeader("Content-Disposition");
else {
String s = getHeader("Content-Disposition", null);
if (s != null) {
/* A Content-Disposition header already exists ..
*
* Override disposition, but attempt to retain
* existing disposition parameters
*/
ContentDisposition cd = new ContentDisposition(s);
cd.setDisposition(disposition);
disposition = cd.toString();
}
setHeader("Content-Disposition", disposition);
}
}
/**
* Returns the content transfer encoding from the
* "Content-Transfer-Encoding" header
* field. Returns null if the header is unavailable
* or its value is absent.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*
* @see #headers
*/
public String getEncoding() throws MessagingException {
String s = getHeader("Content-Transfer-Encoding", null);
if (s == null)
return null;
s = s.trim(); // get rid of trailing spaces
// quick check for known values to avoid unnecessary use
// of tokenizer.
if (s.equalsIgnoreCase("7bit") || s.equalsIgnoreCase("8bit") ||
s.equalsIgnoreCase("quoted-printable") ||
s.equalsIgnoreCase("base64"))
return s;
// Tokenize the header to obtain the encoding (skip comments)
HeaderTokenizer h = new HeaderTokenizer(s, HeaderTokenizer.MIME);
HeaderTokenizer.Token tk;
int tkType;
for (;;) {
tk = h.next(); // get a token
tkType = tk.getType();
if (tkType == HeaderTokenizer.Token.EOF)
break; // done
else if (tkType == HeaderTokenizer.Token.ATOM)
return tk.getValue();
else // invalid token, skip it.
continue;
}
return s;
}
/**
* Returns the value of the "Content-ID" header field. Returns
* null if the field is unavailable or its value is
* absent.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*/
public String getContentID() {
return getHeader("Content-ID", null);
}
/**
* Set the "Content-ID" header field of this body part.
* If the cid parameter is null, any existing
* "Content-ID" is removed.
*
* @exception IllegalStateException if this body part is
* obtained from a READ_ONLY folder.
* @since JavaMail 1.3
*/
public void setContentID(String cid) {
if (cid == null)
removeHeader("Content-ID");
else
setHeader("Content-ID", cid);
}
/**
* Return the value of the "Content-MD5" header field. Returns
* null if this field is unavailable or its value
* is absent.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*/
public String getContentMD5() {
return getHeader("Content-MD5", null);
}
/**
* Set the "Content-MD5" header field of this body part.
*
* @exception IllegalStateException if this body part is
* obtained from a READ_ONLY folder.
*/
public void setContentMD5(String md5) {
setHeader("Content-MD5", md5);
}
/**
* Get the languages specified in the Content-Language header
* of this MimeBodyPart. The Content-Language header is defined by
* RFC 1766. Returns null if this header is not
* available or its value is absent.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*/
public String[] getContentLanguage() throws MessagingException {
String s = getHeader("Content-Language", null);
if (s == null)
return null;
// Tokenize the header to obtain the Language-tags (skip comments)
HeaderTokenizer h = new HeaderTokenizer(s, HeaderTokenizer.MIME);
FinalArrayList v = new FinalArrayList();
HeaderTokenizer.Token tk;
int tkType;
while (true) {
tk = h.next(); // get a language-tag
tkType = tk.getType();
if (tkType == HeaderTokenizer.Token.EOF)
break; // done
else if (tkType == HeaderTokenizer.Token.ATOM) v.add(tk.getValue());
else // invalid token, skip it.
continue;
}
if (v.size() == 0)
return null;
return (String[])v.toArray(new String[v.size()]);
}
/**
* Set the Content-Language header of this MimeBodyPart. The
* Content-Language header is defined by RFC 1766.
*
* @param languages array of language tags
*/
public void setContentLanguage(String[] languages) {
StringBuffer sb = new StringBuffer(languages[0]);
for (int i = 1; i < languages.length; i++)
sb.append(',').append(languages[i]);
setHeader("Content-Language", sb.toString());
}
/**
* Returns the "Content-Description" header field of this body part.
* This typically associates some descriptive information with
* this part. Returns null if this field is unavailable or its
* value is absent.
* * If the Content-Description field is encoded as per RFC 2047, * it is decoded and converted into Unicode. If the decoding or * conversion fails, the raw data is returned as is.
*
* This implementation uses getHeader(name)
* to obtain the requisite header field.
*
* @return content description
*/
public String getDescription() {
String rawvalue = getHeader("Content-Description", null);
if (rawvalue == null)
return null;
try {
return MimeUtility.decodeText(MimeUtility.unfold(rawvalue));
} catch (UnsupportedEncodingException ex) {
return rawvalue;
}
}
/**
* Set the "Content-Description" header field for this body part.
* If the description parameter is null, then any
* existing "Content-Description" fields are removed.
* * If the description contains non US-ASCII characters, it will * be encoded using the platform's default charset. If the * description contains only US-ASCII characters, no encoding * is done and it is used as is.
*
* Note that if the charset encoding process fails, a
* MessagingException is thrown, and an UnsupportedEncodingException
* is included in the chain of nested exceptions within the
* MessagingException.
*
* @param description content description
* @exception IllegalStateException if this body part is
* obtained from a READ_ONLY folder.
* @exception MessagingException An
* UnsupportedEncodingException may be included
* in the exception chain if the charset
* conversion fails.
*/
public void setDescription(String description) throws MessagingException {
setDescription(description, null);
}
/**
* Set the "Content-Description" header field for this body part.
* If the description parameter is null, then any
* existing "Content-Description" fields are removed.
* * If the description contains non US-ASCII characters, it will * be encoded using the specified charset. If the description * contains only US-ASCII characters, no encoding is done and * it is used as is.
* * Note that if the charset encoding process fails, a * MessagingException is thrown, and an UnsupportedEncodingException * is included in the chain of nested exceptions within the * MessagingException. * * @param description Description * @param charset Charset for encoding * @exception IllegalStateException if this body part is * obtained from a READ_ONLY folder. * @exception MessagingException An * UnsupportedEncodingException may be included * in the exception chain if the charset * conversion fails. */ public void setDescription(String description, String charset) throws MessagingException { if (description == null) { removeHeader("Content-Description"); return; } try { setHeader("Content-Description", MimeUtility.fold(21, MimeUtility.encodeText(description, charset, null))); } catch (UnsupportedEncodingException uex) { throw new MessagingException("Encoding error", uex); } } /** * Get the filename associated with this body part.
*
* Returns the value of the "filename" parameter from the
* "Content-Disposition" header field of this body part. If its
* not available, returns the value of the "name" parameter from
* the "Content-Type" header field of this body part.
* Returns null if both are absent.
*
* @return filename
*/
public String getFileName() throws MessagingException {
String filename = null;
String s = getHeader("Content-Disposition", null);
if (s != null) {
// Parse the header ..
ContentDisposition cd = new ContentDisposition(s);
filename = cd.getParameter("filename");
}
if (filename == null) {
// Still no filename ? Try the "name" ContentType parameter
s = getHeader("Content-Type", null);
if (s != null) {
try {
ContentType ct = new ContentType(s);
filename = ct.getParameter("name");
} catch (ParseException pex) { } // ignore it
}
}
return filename;
}
/**
* Set the filename associated with this body part, if possible.
* * Sets the "filename" parameter of the "Content-Disposition" * header field of this body part. * * @exception IllegalStateException if this body part is * obtained from a READ_ONLY folder. */ public void setFileName(String filename) throws MessagingException { // Set the Content-Disposition "filename" parameter String s = getHeader("Content-Disposition", null); ContentDisposition cd = new ContentDisposition(s == null ? ATTACHMENT : s); cd.setParameter("filename", filename); setHeader("Content-Disposition", cd.toString()); /* Also attempt to set the Content-Type "name" parameter, * to satisfy ancient MUAs. * XXX: This is not RFC compliant, and hence should really * be conditional based on some property. Fix this once we * figure out how to get at Properties from here ! */ s = getHeader("Content-Type", null); if (s != null) { try { ContentType cType = new ContentType(s); cType.setParameter("name", filename); setHeader("Content-Type", cType.toString()); } catch (ParseException pex) { } // ignore it } } /** * Return a decoded input stream for this body part's "content".
* * This implementation obtains the input stream from the DataHandler. * That is, it invokes getDataHandler().getInputStream(); * * @return an InputStream * @exception IOException this is typically thrown by the * DataHandler. Refer to the documentation for * javax.activation.DataHandler for more details. * * @see #getContentStream * @see DataHandler#getInputStream */ public InputStream getInputStream() throws IOException { return getDataHandler().getInputStream(); } /** * Produce the raw bytes of the content. This method is used * when creating a DataHandler object for the content. Subclasses * that can provide a separate input stream for just the MimeBodyPart * content might want to override this method.
*
* @see #content
*/
/*package*/ InputStream getContentStream() throws MessagingException {
if (mimePart != null) {
return mimePart.read();
}
if (contentStream != null)
return ((SharedInputStream)contentStream).newStream(0, -1);
if (content != null)
return new ByteArrayInputStream(content,start,contentLength);
throw new MessagingException("No content");
}
/**
* Return an InputStream to the raw data with any Content-Transfer-Encoding
* intact. This method is useful if the "Content-Transfer-Encoding"
* header is incorrect or corrupt, which would prevent the
* getInputStream method or getContent method
* from returning the correct data. In such a case the application may
* use this method and attempt to decode the raw data itself.
*
* This implementation simply calls the getContentStream
* method.
*
* @see #getInputStream
* @see #getContentStream
* @since JavaMail 1.2
*/
public InputStream getRawInputStream() throws MessagingException {
return getContentStream();
}
/**
* Return a DataHandler for this body part's content.
* * The implementation provided here works just like the * the implementation in MimeMessage. */ public DataHandler getDataHandler() { if (mimePart != null) { //return an inputstream return new DataHandler(new DataSource() { public InputStream getInputStream() throws IOException { return mimePart.read(); } public OutputStream getOutputStream() throws IOException { throw new UnsupportedOperationException("getOutputStream cannot be supported : You have enabled LazyAttachments Option"); } public String getContentType() { return mimePart.getContentType(); } public String getName() { return "MIMEPart Wrapped DataSource"; } }); } if (dh == null) dh = new DataHandler(new MimePartDataSource(this)); return dh; } /** * Return the content as a java object. The type of the object * returned is of course dependent on the content itself. For * example, the native format of a text/plain content is usually * a String object. The native format for a "multipart" * content is always a MimeMultipart subclass. For content types that are * unknown to the DataHandler system, an input stream is returned * as the content.
* * This implementation obtains the content from the DataHandler. * That is, it invokes getDataHandler().getContent(); * * @return Object * @exception IOException this is typically thrown by the * DataHandler. Refer to the documentation for * javax.activation.DataHandler for more details. */ public Object getContent() throws IOException { return getDataHandler().getContent(); } /** * This method provides the mechanism to set this body part's content. * The given DataHandler object should wrap the actual content. * * @param dh The DataHandler for the content * @exception IllegalStateException if this body part is * obtained from a READ_ONLY folder. */ public void setDataHandler(DataHandler dh) { if (mimePart != null) { mimePart = null; } this.dh = dh; this.content = null; this.contentStream = null; removeHeader("Content-Type"); removeHeader("Content-Transfer-Encoding"); } /** * A convenience method for setting this body part's content.
*
* The content is wrapped in a DataHandler object. Note that a
* DataContentHandler class for the specified type should be
* available to the JavaMail implementation for this to work right.
* That is, to do setContent(foobar, "application/x-foobar"),
* a DataContentHandler for "application/x-foobar" should be installed.
* Refer to the Java Activation Framework for more information.
*
* @param o the content object
* @param type Mime type of the object
* @exception IllegalStateException if this body part is
* obtained from a READ_ONLY folder.
*/
public void setContent(Object o, String type) {
if (mimePart != null) {
mimePart = null;
}
if (o instanceof MimeMultipart) {
setContent((MimeMultipart)o);
} else {
setDataHandler(new DataHandler(o, type));
}
}
/**
* Convenience method that sets the given String as this
* part's content, with a MIME type of "text/plain". If the
* string contains non US-ASCII characters, it will be encoded
* using the platform's default charset. The charset is also
* used to set the "charset" parameter.
*
* Note that there may be a performance penalty if
* text is large, since this method may have
* to scan all the characters to determine what charset to
* use.
* If the charset is already known, use the
* setText() version that takes the charset parameter.
*
* @see #setText(String text, String charset)
*/
public void setText(String text) {
setText(text, null);
}
/**
* Convenience method that sets the given String as this part's
* content, with a MIME type of "text/plain" and the specified
* charset. The given Unicode string will be charset-encoded
* using the specified charset. The charset is also used to set
* the "charset" parameter.
*/
public void setText(String text, String charset) {
if (charset == null) {
if (MimeUtility.checkAscii(text) != MimeUtility.ALL_ASCII)
charset = MimeUtility.getDefaultMIMECharset();
else
charset = "us-ascii";
}
setContent(text, "text/plain; charset=" +
MimeUtility.quote(charset, HeaderTokenizer.MIME));
}
/**
* This method sets the body part's content to a MimeMultipart object.
*
* @param mp The multipart object that is the Message's content
* @exception IllegalStateException if this body part is
* obtained from a READ_ONLY folder.
*/
public void setContent(MimeMultipart mp) {
if (mimePart != null) {
mimePart = null;
}
setDataHandler(new DataHandler(mp, mp.getContentType().toString()));
mp.setParent(this);
}
/**
* Output the body part as an RFC 822 format stream.
*
* @exception MessagingException
* @exception IOException if an error occurs writing to the
* stream or if an error is generated
* by the javax.activation layer.
* @see DataHandler#writeTo
*/
public void writeTo(OutputStream os)
throws IOException, MessagingException {
// First, write out the header
List hdrLines = headers.getAllHeaderLines();
int sz = hdrLines.size();
for( int i=0; iContent-Type and Content-Transfer-Encoding.
* Headers might need to be updated in two cases:
*
*
* - A message being crafted by a mail application will certainly
* need to activate this method at some point to fill up its internal
* headers.
*
*
* - A message read in from a Store will have obtained
* all its headers from the store, and so doesn't need this.
* However, if this message is editable and if any edits have
* been made to either the content or message structure, we might
* need to resync our headers.
*
*
* In both cases this method is typically called by the
* Message.saveChanges method.
*/
protected void updateHeaders() throws MessagingException {
DataHandler dh = getDataHandler();
/*
* Code flow indicates null is never returned from
* getdataHandler() - findbugs
*/
//if (dh == null) // Huh ?
// return;
try {
String type = dh.getContentType();
boolean composite = false;
boolean needCTHeader = getHeader("Content-Type") == null;
ContentType cType = new ContentType(type);
if (cType.match("multipart/*")) {
// If multipart, recurse
composite = true;
Object o = dh.getContent();
((MimeMultipart) o).updateHeaders();
} else if (cType.match("message/rfc822")) {
composite = true;
}
// Content-Transfer-Encoding, but only if we don't
// already have one
if (!composite) { // not allowed on composite parts
if (getHeader("Content-Transfer-Encoding") == null)
setEncoding(MimeUtility.getEncoding(dh));
if (needCTHeader && setDefaultTextCharset &&
cType.match("text/*") &&
cType.getParameter("charset") == null) {
/*
* Set a default charset for text parts.
* We really should examine the data to determine
* whether or not it's all ASCII, but that's too
* expensive so we make an assumption: If we
* chose 7bit encoding for this data, it's probably
* ASCII. (MimeUtility.getEncoding will choose
* 7bit only in this case, but someone might've
* set the Content-Transfer-Encoding header manually.)
*/
String charset;
String enc = getEncoding();
if (enc != null && enc.equalsIgnoreCase("7bit"))
charset = "us-ascii";
else
charset = MimeUtility.getDefaultMIMECharset();
cType.setParameter("charset", charset);
type = cType.toString();
}
}
// Now, let's update our own headers ...
// Content-type, but only if we don't already have one
if (needCTHeader) {
/*
* Pull out "filename" from Content-Disposition, and
* use that to set the "name" parameter. This is to
* satisfy older MUAs (DtMail, Roam and probably
* a bunch of others).
*/
String s = getHeader("Content-Disposition", null);
if (s != null) {
// Parse the header ..
ContentDisposition cd = new ContentDisposition(s);
String filename = cd.getParameter("filename");
if (filename != null) {
cType.setParameter("name", filename);
type = cType.toString();
}
}
setHeader("Content-Type", type);
}
} catch (IOException ex) {
throw new MessagingException("IOException updating headers", ex);
}
}
private void setEncoding(String encoding) {
setHeader("Content-Transfer-Encoding", encoding);
}
}