From ff07dc2bb156d62f447bc3613d6df339fa09794c Mon Sep 17 00:00:00 2001
From: Martijn Coenen <maco@google.com>
Date: Mon, 2 Apr 2012 13:20:33 -0700
Subject: Add support for making Mifare Classic readonly.

Change-Id: I7572274dd74d8f9c3f0c80bdccf3d30707c91c3f
---
 jni/com_android_nfc_NativeNfcTag.cpp          | 12 ++++++++----
 src/com/android/nfc/nxp/NativeNfcManager.java |  3 ++-
 src/com/android/nfc/nxp/NativeNfcTag.java     | 11 +++++++++--
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/jni/com_android_nfc_NativeNfcTag.cpp b/jni/com_android_nfc_NativeNfcTag.cpp
index f35dbf9..dbf8dc9 100644
--- a/jni/com_android_nfc_NativeNfcTag.cpp
+++ b/jni/com_android_nfc_NativeNfcTag.cpp
@@ -1162,12 +1162,13 @@ clean_and_return:
    return result;
 }
 
-static jboolean com_android_nfc_NativeNfcTag_doMakeReadonly(JNIEnv *e, jobject o)
+static jboolean com_android_nfc_NativeNfcTag_doMakeReadonly(JNIEnv *e, jobject o, jbyteArray key)
 {
    phLibNfc_Handle handle = 0;
    NFCSTATUS status;
    jboolean result = JNI_FALSE;
    struct nfc_jni_callback_data cb_data;
+   phNfc_sData_t keyBuffer;
 
    CONCURRENCY_LOCK();
 
@@ -1178,10 +1179,12 @@ static jboolean com_android_nfc_NativeNfcTag_doMakeReadonly(JNIEnv *e, jobject o
    }
 
    handle = nfc_jni_get_connected_handle(e, o);
-
+   keyBuffer.buffer = (uint8_t *)e->GetByteArrayElements(key, NULL);
+   keyBuffer.length = e->GetArrayLength(key);
    TRACE("phLibNfc_ConvertToReadOnlyNdef()");
    REENTRANCE_LOCK();
-   status = phLibNfc_ConvertToReadOnlyNdef(handle, nfc_jni_readonly_callback, (void *)&cb_data);
+   status = phLibNfc_ConvertToReadOnlyNdef(handle, &keyBuffer, nfc_jni_readonly_callback,
+           (void *)&cb_data);
    REENTRANCE_UNLOCK();
 
    if(status != NFCSTATUS_PENDING)
@@ -1204,6 +1207,7 @@ static jboolean com_android_nfc_NativeNfcTag_doMakeReadonly(JNIEnv *e, jobject o
    }
 
 clean_and_return:
+   e->ReleaseByteArrayElements(key, (jbyte *)keyBuffer.buffer, JNI_ABORT);
    nfc_cb_data_deinit(&cb_data);
    CONCURRENCY_UNLOCK();
    return result;
@@ -1237,7 +1241,7 @@ static JNINativeMethod gMethods[] =
       (void *)com_android_nfc_NativeNfcTag_doIsIsoDepNdefFormatable},
    {"doNdefFormat", "([B)Z",
       (void *)com_android_nfc_NativeNfcTag_doNdefFormat},
-   {"doMakeReadonly", "()Z",
+   {"doMakeReadonly", "([B)Z",
       (void *)com_android_nfc_NativeNfcTag_doMakeReadonly},
 };
 
diff --git a/src/com/android/nfc/nxp/NativeNfcManager.java b/src/com/android/nfc/nxp/NativeNfcManager.java
index 9a62cc0..1a50805 100755
--- a/src/com/android/nfc/nxp/NativeNfcManager.java
+++ b/src/com/android/nfc/nxp/NativeNfcManager.java
@@ -238,7 +238,8 @@ public class NativeNfcManager implements DeviceHost {
 
     @Override
     public boolean canMakeReadOnly(int ndefType) {
-        return (ndefType == Ndef.TYPE_1 || ndefType == Ndef.TYPE_2);
+        return (ndefType == Ndef.TYPE_1 || ndefType == Ndef.TYPE_2 ||
+                ndefType == Ndef.TYPE_MIFARE_CLASSIC);
     }
 
     @Override
diff --git a/src/com/android/nfc/nxp/NativeNfcTag.java b/src/com/android/nfc/nxp/NativeNfcTag.java
index 53e1312..8996dfb 100755
--- a/src/com/android/nfc/nxp/NativeNfcTag.java
+++ b/src/com/android/nfc/nxp/NativeNfcTag.java
@@ -21,6 +21,7 @@ import com.android.nfc.DeviceHost.TagEndpoint;
 import android.nfc.FormatException;
 import android.nfc.NdefMessage;
 import android.nfc.tech.IsoDep;
+import android.nfc.tech.MifareClassic;
 import android.nfc.tech.MifareUltralight;
 import android.nfc.tech.Ndef;
 import android.nfc.tech.NfcA;
@@ -350,13 +351,19 @@ public class NativeNfcTag implements TagEndpoint {
         return result;
     }
 
-    native boolean doMakeReadonly();
+    native boolean doMakeReadonly(byte[] key);
     @Override
     public synchronized boolean makeReadOnly() {
         if (mWatchdog != null) {
             mWatchdog.pause();
         }
-        boolean result = doMakeReadonly();
+        boolean result;
+        if (hasTech(TagTechnology.MIFARE_CLASSIC)) {
+            result = doMakeReadonly(MifareClassic.KEY_DEFAULT);
+        } else {
+            // No key needed for other technologies
+            result = doMakeReadonly(new byte[] {});
+        }
         if (mWatchdog != null) {
             mWatchdog.doResume();
         }
-- 
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