Parse "multipart/vnd.wap.multipart.alternative" which is a part of multipart body (nested multipart).

And take the first part of parsed as a parent part data.

Change-Id: I2752654f41d642524061802772e2a7eaa10a4e2d

Author: takuo

core/java/com/google/android/mms/ContentType.java

@@ -26,6 +26,7 @@ public class ContentType {
     public static final String MMS_GENERIC       = "application/vnd.wap.mms-generic";
     public static final String MULTIPART_MIXED   = "application/vnd.wap.multipart.mixed";
     public static final String MULTIPART_RELATED = "application/vnd.wap.multipart.related";
+    public static final String MULTIPART_ALTERNATIVE = "application/vnd.wap.multipart.alternative";
 
     public static final String TEXT_PLAIN        = "text/plain";
     public static final String TEXT_HTML         = "text/html";

core/java/com/google/android/mms/pdu/PduParser.java

@@ -778,26 +778,34 @@ protected static PduBody parseParts(ByteArrayInputStream pduDataStream) {
             /* get part's data */
             if (dataLength > 0) {
                 byte[] partData = new byte[dataLength];
+                String partContentType = new String(part.getContentType());
                 pduDataStream.read(partData, 0, dataLength);
-                // Check Content-Transfer-Encoding.
-                byte[] partDataEncoding = part.getContentTransferEncoding();
-                if (null != partDataEncoding) {
-                    String encoding = new String(partDataEncoding);
-                    if (encoding.equalsIgnoreCase(PduPart.P_BASE64)) {
-                        // Decode "base64" into "binary".
-                        partData = Base64.decodeBase64(partData);
-                    } else if (encoding.equalsIgnoreCase(PduPart.P_QUOTED_PRINTABLE)) {
-                        // Decode "quoted-printable" into "binary".
-                        partData = QuotedPrintable.decodeQuotedPrintable(partData);
-                    } else {
-                        // "binary" is the default encoding.
+                if (partContentType.equalsIgnoreCase(ContentType.MULTIPART_ALTERNATIVE)) {
+                    // parse "multipart/vnd.wap.multipart.alternative".
+                    PduBody childBody = parseParts(new ByteArrayInputStream(partData));
+                    // take the first part of children.
+                    part = childBody.getPart(0);
+                } else {
+                    // Check Content-Transfer-Encoding.
+                    byte[] partDataEncoding = part.getContentTransferEncoding();
+                    if (null != partDataEncoding) {
+                        String encoding = new String(partDataEncoding);
+                        if (encoding.equalsIgnoreCase(PduPart.P_BASE64)) {
+                            // Decode "base64" into "binary".
+                            partData = Base64.decodeBase64(partData);
+                        } else if (encoding.equalsIgnoreCase(PduPart.P_QUOTED_PRINTABLE)) {
+                            // Decode "quoted-printable" into "binary".
+                            partData = QuotedPrintable.decodeQuotedPrintable(partData);
+                        } else {
+                            // "binary" is the default encoding.
+                        }
                     }
+                    if (null == partData) {
+                        log("Decode part data error!");
+                        return null;
+                    }
+                    part.setData(partData);
                 }
-                if (null == partData) {
-                    log("Decode part data error!");
-                    return null;
-                }
-                part.setData(partData);
             }
 
             /* add this part to body */