From e910e8bf863e50ef434c980d5d2ee403b3307514 Mon Sep 17 00:00:00 2001
From: Love Khanna <love.khanna@nxp.com>
Date: Fri, 12 May 2017 13:53:42 +0530
Subject: [PATCH] AID suffix registration.

Test: compiles.

Change-Id: I0ab02599814722055d77eef29e734bfd45e8d1ee
---
 .../nfc/cardemulation/ApduServiceInfo.java    | 25 +++++++++++++++++++
 .../nfc/cardemulation/CardEmulation.java      | 12 +++++----
 2 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/core/java/android/nfc/cardemulation/ApduServiceInfo.java b/core/java/android/nfc/cardemulation/ApduServiceInfo.java
index 7678678f3513a..218e4f223549d 100644
--- a/core/java/android/nfc/cardemulation/ApduServiceInfo.java
+++ b/core/java/android/nfc/cardemulation/ApduServiceInfo.java
@@ -253,6 +253,20 @@ public final class ApduServiceInfo implements Parcelable {
                         Log.e(TAG, "Ignoring invalid or duplicate aid: " + aid);
                     }
                     a.recycle();
+                } else if (eventType == XmlPullParser.START_TAG &&
+                        tagName.equals("aid-suffix-filter") && currentGroup != null) {
+                    final TypedArray a = res.obtainAttributes(attrs,
+                            com.android.internal.R.styleable.AidFilter);
+                    String aid = a.getString(com.android.internal.R.styleable.AidFilter_name).
+                            toUpperCase();
+                    // Add wildcard char to indicate suffix
+                    aid = aid.concat("#");
+                    if (CardEmulation.isValidAid(aid) && !currentGroup.aids.contains(aid)) {
+                        currentGroup.aids.add(aid);
+                    } else {
+                        Log.e(TAG, "Ignoring invalid or duplicate aid: " + aid);
+                    }
+                    a.recycle();
                 }
             }
         } catch (NameNotFoundException e) {
@@ -297,6 +311,17 @@ public final class ApduServiceInfo implements Parcelable {
         return prefixAids;
     }
 
+    public List<String> getSubsetAids() {
+        final ArrayList<String> subsetAids = new ArrayList<String>();
+        for (AidGroup group : getAidGroups()) {
+            for (String aid : group.aids) {
+                if (aid.endsWith("#")) {
+                    subsetAids.add(aid);
+                }
+            }
+        }
+        return subsetAids;
+    }
     /**
      * Returns the registered AID group for this category.
      */
diff --git a/core/java/android/nfc/cardemulation/CardEmulation.java b/core/java/android/nfc/cardemulation/CardEmulation.java
index b49288e6e59ef..6dd7993965992 100644
--- a/core/java/android/nfc/cardemulation/CardEmulation.java
+++ b/core/java/android/nfc/cardemulation/CardEmulation.java
@@ -606,6 +606,8 @@ public final class CardEmulation {
      * <li>Consist of only hex characters
      * <li>Additionally, we allow an asterisk at the end, to indicate
      *     a prefix
+     * <li>Additinally we allow an (#) at symbol at the end, to indicate
+     *     a subset
      * </ul>
      *
      * @hide
@@ -614,20 +616,20 @@ public final class CardEmulation {
         if (aid == null)
             return false;
 
-        // If a prefix AID, the total length must be odd (even # of AID chars + '*')
-        if (aid.endsWith("*") && ((aid.length() % 2) == 0)) {
+        // If a prefix/subset AID, the total length must be odd (even # of AID chars + '*')
+        if ((aid.endsWith("*") || aid.endsWith("#")) && ((aid.length() % 2) == 0)) {
             Log.e(TAG, "AID " + aid + " is not a valid AID.");
             return false;
         }
 
-        // If not a prefix AID, the total length must be even (even # of AID chars)
-        if (!aid.endsWith("*") && ((aid.length() % 2) != 0)) {
+        // If not a prefix/subset AID, the total length must be even (even # of AID chars)
+        if ((!(aid.endsWith("*") || aid.endsWith("#"))) && ((aid.length() % 2) != 0)) {
             Log.e(TAG, "AID " + aid + " is not a valid AID.");
             return false;
         }
 
         // Verify hex characters
-        if (!aid.matches("[0-9A-Fa-f]{10,32}\\*?")) {
+        if (!aid.matches("[0-9A-Fa-f]{10,32}\\*?\\#?")) {
             Log.e(TAG, "AID " + aid + " is not a valid AID.");
             return false;
         }