diff --git a/otafault/config.cpp b/otafault/config.cpp
new file mode 100644
index 0000000..c87f9a6
--- /dev/null
+++ b/otafault/config.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include <map>
+#include <string>
+
+#include <stdio.h>
+#include <unistd.h>
+
+#include "minzip/Zip.h"
+#include "config.h"
+#include "ota_io.h"
+
+#define OTAIO_MAX_FNAME_SIZE 128
+
+static ZipArchive* archive;
+static std::map<const char*, bool> should_inject_cache;
+
+static const char* get_type_path(const char* io_type) {
+    char* path = (char*)calloc(strlen(io_type) + strlen(OTAIO_BASE_DIR) + 2, sizeof(char));
+    sprintf(path, "%s/%s", OTAIO_BASE_DIR, io_type);
+    return path;
+}
+
+void ota_io_init(ZipArchive* za) {
+    archive = za;
+    ota_set_fault_files();
+}
+
+bool should_fault_inject(const char* io_type) {
+    if (should_inject_cache.find(io_type) != should_inject_cache.end()) {
+        return should_inject_cache[io_type];
+    }
+    const char* type_path = get_type_path(io_type);
+    const ZipEntry* entry = mzFindZipEntry(archive, type_path);
+    should_inject_cache[type_path] = entry != nullptr;
+    free((void*)type_path);
+    return entry != NULL;
+}
+
+bool should_hit_cache() {
+    return should_fault_inject(OTAIO_CACHE);
+}
+
+std::string fault_fname(const char* io_type) {
+    const char* type_path = get_type_path(io_type);
+    char* fname = (char*) calloc(OTAIO_MAX_FNAME_SIZE, sizeof(char));
+    const ZipEntry* entry = mzFindZipEntry(archive, type_path);
+    mzReadZipEntry(archive, entry, fname, OTAIO_MAX_FNAME_SIZE);
+    free((void*)type_path);
+    return std::string(fname);
+}