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diff --git a/amend/permissions.h b/amend/permissions.h
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+++ b/amend/permissions.h
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AMEND_PERMISSIONS_H_
+#define AMEND_PERMISSIONS_H_
+
+#include <stdbool.h>
+
+#define PERM_NONE   (0)
+#define PERM_STAT   (1<<0)
+#define PERM_READ   (1<<1)
+#define PERM_WRITE  (1<<2)  // including create, delete, mkdir, rmdir
+#define PERM_CHMOD  (1<<3)
+#define PERM_CHOWN  (1<<4)
+#define PERM_CHGRP  (1<<5)
+#define PERM_SETUID (1<<6)
+#define PERM_SETGID (1<<7)
+
+#define PERMSET_READ (PERM_STAT | PERM_READ)
+#define PERMSET_WRITE (PERMSET_READ | PERM_WRITE)
+
+#define PERMSET_ALL \
+    (PERM_STAT | PERM_READ | PERM_WRITE | PERM_CHMOD | \
+    PERM_CHOWN | PERM_CHGRP | PERM_SETUID | PERM_SETGID)
+
+typedef struct {
+    unsigned int requested;
+    unsigned int allowed;
+    const char *path;
+    bool recursive;
+} PermissionRequest;
+
+typedef struct {
+    PermissionRequest *requests;
+    int numRequests;
+    int requestsAllocated;
+} PermissionRequestList;
+
+/* Properly clear out a PermissionRequestList.
+ *
+ * @return 0 if list is non-NULL, negative otherwise.
+ */
+int initPermissionRequestList(PermissionRequestList *list);
+
+/* Add a permission request to the list, allocating more space
+ * if necessary.
+ *
+ * @return 0 on success or a negative value on failure.
+ */
+int addPermissionRequestToList(PermissionRequestList *list,
+        const char *path, bool recursive, unsigned int permissions);
+
+/* Free anything allocated by addPermissionRequestToList().  The caller
+ * is responsible for freeing the actual PermissionRequestList.
+ */
+void freePermissionRequestListElements(PermissionRequestList *list);
+
+
+/*
+ * Global permission table
+ */
+
+typedef struct {
+    const char *path;
+    unsigned int allowed;
+} Permission;
+
+int permissionInit(void);
+void permissionCleanup(void);
+
+/* Returns the allowed permissions for the path in "outAllowed".
+ * Returns 0 if successful, negative if a parameter or global state
+ * is bad.
+ */
+int getAllowedPermissions(const char *path, bool recursive,
+        unsigned int *outAllowed);
+
+/* More-recently-registered permissions override older permissions.
+ */
+int registerPermissionSet(int count, Permission *set);
+
+/* Check to make sure that each request is allowed.
+ *
+ * @param requests The list of permission requests
+ * @param updateAllowed If true, update the "allowed" field in each
+ *                      element of the list
+ * @return the number of requests that were denied, or negative if
+ *         an error occurred.
+ */
+int countPermissionConflicts(PermissionRequestList *requests,
+        bool updateAllowed);
+
+/* Inspection/testing/debugging functions
+ */
+int getPermissionCount(void);
+const Permission *getPermissionAt(int index);
+
+#endif  // AMEND_PERMISSIONS_H_