diff --git a/Android.mk b/Android.mk
index fc981e1..c2f98c6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -43,6 +43,7 @@
     ui.cpp \
     verifier.cpp \
     wear_ui.cpp \
+    wear_touch.cpp \
 
 LOCAL_MODULE := recovery
 
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
index 09ec876..e7dd17b 100644
--- a/minzip/SysUtil.c
+++ b/minzip/SysUtil.c
@@ -39,6 +39,11 @@
     pMap->length = sb.st_size;
     pMap->range_count = 1;
     pMap->ranges = malloc(sizeof(MappedRange));
+    if (pMap->ranges == NULL) {
+        LOGE("malloc failed: %s\n", strerror(errno));
+        munmap(memPtr, sb.st_size);
+        return false;
+    }
     pMap->ranges[0].addr = memPtr;
     pMap->ranges[0].length = sb.st_size;
 
@@ -50,7 +55,7 @@
     char block_dev[PATH_MAX+1];
     size_t size;
     unsigned int blksize;
-    unsigned int blocks;
+    size_t blocks;
     unsigned int range_count;
     unsigned int i;
 
@@ -69,49 +74,80 @@
         LOGE("failed to parse block map header\n");
         return -1;
     }
-
-    blocks = ((size-1) / blksize) + 1;
+    if (blksize != 0) {
+        blocks = ((size-1) / blksize) + 1;
+    }
+    if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) {
+        LOGE("invalid data in block map file: size %zu, blksize %u, range_count %u\n",
+             size, blksize, range_count);
+        return -1;
+    }
 
     pMap->range_count = range_count;
-    pMap->ranges = malloc(range_count * sizeof(MappedRange));
-    memset(pMap->ranges, 0, range_count * sizeof(MappedRange));
+    pMap->ranges = calloc(range_count, sizeof(MappedRange));
+    if (pMap->ranges == NULL) {
+        LOGE("calloc(%u, %zu) failed: %s\n", range_count, sizeof(MappedRange), strerror(errno));
+        return -1;
+    }
 
     // Reserve enough contiguous address space for the whole file.
     unsigned char* reserve;
     reserve = mmap64(NULL, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
     if (reserve == MAP_FAILED) {
         LOGE("failed to reserve address space: %s\n", strerror(errno));
+        free(pMap->ranges);
         return -1;
     }
 
-    pMap->ranges[range_count-1].addr = reserve;
-    pMap->ranges[range_count-1].length = blocks * blksize;
-
     int fd = open(block_dev, O_RDONLY);
     if (fd < 0) {
         LOGE("failed to open block device %s: %s\n", block_dev, strerror(errno));
+        munmap(reserve, blocks * blksize);
+        free(pMap->ranges);
         return -1;
     }
 
     unsigned char* next = reserve;
+    size_t remaining_size = blocks * blksize;
+    bool success = true;
     for (i = 0; i < range_count; ++i) {
-        int start, end;
-        if (fscanf(mapf, "%d %d\n", &start, &end) != 2) {
+        size_t start, end;
+        if (fscanf(mapf, "%zu %zu\n", &start, &end) != 2) {
             LOGE("failed to parse range %d in block map\n", i);
-            return -1;
+            success = false;
+            break;
+        }
+        size_t length = (end - start) * blksize;
+        if (end <= start || (end - start) > SIZE_MAX / blksize || length > remaining_size) {
+          LOGE("unexpected range in block map: %zu %zu\n", start, end);
+          success = false;
+          break;
         }
 
-        void* addr = mmap64(next, (end-start)*blksize, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
+        void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
         if (addr == MAP_FAILED) {
             LOGE("failed to map block %d: %s\n", i, strerror(errno));
-            return -1;
+            success = false;
+            break;
         }
         pMap->ranges[i].addr = addr;
-        pMap->ranges[i].length = (end-start)*blksize;
+        pMap->ranges[i].length = length;
 
-        next += pMap->ranges[i].length;
+        next += length;
+        remaining_size -= length;
+    }
+    if (success && remaining_size != 0) {
+      LOGE("ranges in block map are invalid: remaining_size = %zu\n", remaining_size);
+      success = false;
+    }
+    if (!success) {
+      close(fd);
+      munmap(reserve, blocks * blksize);
+      free(pMap->ranges);
+      return -1;
     }
 
+    close(fd);
     pMap->addr = reserve;
     pMap->length = size;
 
@@ -134,6 +170,7 @@
 
         if (sysMapBlockFile(mapf, pMap) != 0) {
             LOGE("Map of '%s' failed\n", fn);
+            fclose(mapf);
             return -1;
         }
 
diff --git a/otafault/Android.mk b/otafault/Android.mk
index 50e385e..d0b1174 100644
--- a/otafault/Android.mk
+++ b/otafault/Android.mk
@@ -14,8 +14,6 @@
 
 LOCAL_PATH := $(call my-dir)
 
-# otafault (static library)
-# ===============================
 include $(CLEAR_VARS)
 
 otafault_static_libs := \
@@ -25,11 +23,12 @@
     libselinux
 
 LOCAL_SRC_FILES := config.cpp ota_io.cpp
+LOCAL_MODULE_TAGS := eng
 LOCAL_MODULE := libotafault
 LOCAL_CLANG := true
 LOCAL_C_INCLUDES := bootable/recovery
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
-LOCAL_STATIC_LIBRARIES := $(otafault_static_libs)
+LOCAL_WHOLE_STATIC_LIBRARIES := $(otafault_static_libs)
 
 include $(BUILD_STATIC_LIBRARY)
 
@@ -40,9 +39,7 @@
 LOCAL_SRC_FILES := config.cpp ota_io.cpp test.cpp
 LOCAL_MODULE_TAGS := tests
 LOCAL_MODULE := otafault_test
-LOCAL_STATIC_LIBRARIES := \
-    libotafault \
-    $(otafault_static_libs)
+LOCAL_STATIC_LIBRARIES := $(otafault_static_libs)
 LOCAL_C_INCLUDES := bootable/recovery
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 
diff --git a/otafault/ota_io.cpp b/otafault/ota_io.cpp
index dd805e5..94be815 100644
--- a/otafault/ota_io.cpp
+++ b/otafault/ota_io.cpp
@@ -29,7 +29,6 @@
 static std::string read_fault_file_name = "";
 static std::string write_fault_file_name = "";
 static std::string fsync_fault_file_name = "";
-bool have_eio_error = false;
 
 static bool get_hit_file(const char* cached_path, std::string ffn) {
     return should_hit_cache()
@@ -49,6 +48,8 @@
     }
 }
 
+bool have_eio_error = false;
+
 int ota_open(const char* path, int oflags) {
     // Let the caller handle errors; we do not care if open succeeds or fails
     int fd = open(path, oflags);
diff --git a/recovery.cpp b/recovery.cpp
index 4ee835c..2d768ce 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -79,7 +79,10 @@
 static const char *LOG_FILE = "/cache/recovery/log";
 static const char *LAST_INSTALL_FILE = "/cache/recovery/last_install";
 static const char *LOCALE_FILE = "/cache/recovery/last_locale";
+static const char *CONVERT_FBE_DIR = "/tmp/convert_fbe";
+static const char *CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
 static const char *CACHE_ROOT = "/cache";
+static const char *DATA_ROOT = "/data";
 static const char *SDCARD_ROOT = "/sdcard";
 static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log";
 static const char *TEMPORARY_INSTALL_FILE = "/tmp/last_install";
@@ -506,6 +509,7 @@
 
 static bool erase_volume(const char* volume) {
     bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
+    bool is_data = (strcmp(volume, DATA_ROOT) == 0);
 
     ui->SetBackground(RecoveryUI::ERASING);
     ui->SetProgressType(RecoveryUI::INDETERMINATE);
@@ -560,7 +564,28 @@
     ui->Print("Formatting %s...\n", volume);
 
     ensure_path_unmounted(volume);
-    int result = format_volume(volume);
+
+    int result;
+
+    if (is_data && reason && strcmp(reason, "convert_fbe") == 0) {
+        // Create convert_fbe breadcrumb file to signal to init
+        // to convert to file based encryption, not full disk encryption
+        if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
+            ui->Print("Failed to make convert_fbe dir %s\n", strerror(errno));
+            return true;
+        }
+        FILE* f = fopen(CONVERT_FBE_FILE, "wb");
+        if (!f) {
+            ui->Print("Failed to convert to file encryption %s\n", strerror(errno));
+            return true;
+        }
+        fclose(f);
+        result = format_volume(volume, CONVERT_FBE_DIR);
+        remove(CONVERT_FBE_FILE);
+        rmdir(CONVERT_FBE_DIR);
+    } else {
+        result = format_volume(volume);
+    }
 
     if (is_cache) {
         while (head) {
diff --git a/roots.cpp b/roots.cpp
index 12c6b5e..f361cb8 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -175,7 +175,7 @@
     return WEXITSTATUS(status);
 }
 
-int format_volume(const char* volume) {
+int format_volume(const char* volume, const char* directory) {
     Volume* v = volume_for_path(volume);
     if (v == NULL) {
         LOGE("unknown volume \"%s\"\n", volume);
@@ -241,7 +241,7 @@
         }
         int result;
         if (strcmp(v->fs_type, "ext4") == 0) {
-            result = make_ext4fs(v->blk_device, length, volume, sehandle);
+            result = make_ext4fs_directory(v->blk_device, length, volume, sehandle, directory);
         } else {   /* Has to be f2fs because we checked earlier. */
             if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0 && length < 0) {
                 LOGE("format_volume: crypt footer + negative length (%zd) not supported on %s\n", length, v->fs_type);
@@ -273,6 +273,10 @@
     return -1;
 }
 
+int format_volume(const char* volume) {
+    return format_volume(volume, NULL);
+}
+
 int setup_install_mounts() {
     if (fstab == NULL) {
         LOGE("can't set up install mounts: no fstab loaded\n");
diff --git a/roots.h b/roots.h
index 6e3b243..a14b7d9 100644
--- a/roots.h
+++ b/roots.h
@@ -41,6 +41,12 @@
 // it is mounted.
 int format_volume(const char* volume);
 
+// Reformat the given volume (must be the mount point only, eg
+// "/cache"), no paths permitted.  Attempts to unmount the volume if
+// it is mounted.
+// Copies 'directory' to root of the newly formatted volume
+int format_volume(const char* volume, const char* directory);
+
 // Ensure that all and only the volumes that packages expect to find
 // mounted (/tmp and /cache) are mounted.  Returns 0 on success.
 int setup_install_mounts();
diff --git a/screen_ui.cpp b/screen_ui.cpp
index 522aa6b..3614e7a 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -40,8 +40,7 @@
 #include "screen_ui.h"
 #include "ui.h"
 
-static int char_width;
-static int char_height;
+#define TEXT_INDENT     4
 
 // Return the current time as a double (including fractions of a second).
 static double now() {
@@ -54,7 +53,6 @@
     currentIcon(NONE),
     installingFrame(0),
     locale(nullptr),
-    rtl_locale(false),
     progressBarType(EMPTY),
     progressScopeStart(0),
     progressScopeSize(0),
@@ -76,7 +74,8 @@
     animation_fps(-1),
     installing_frames(-1),
     stage(-1),
-    max_stage(-1) {
+    max_stage(-1),
+    rtl_locale(false) {
 
     for (int i = 0; i < 5; i++) {
         backgroundIcon[i] = nullptr;
@@ -213,14 +212,14 @@
     *y += 4;
 }
 
-void ScreenRecoveryUI::DrawTextLine(int* y, const char* line, bool bold) {
-    gr_text(4, *y, line, bold);
-    *y += char_height + 4;
+void ScreenRecoveryUI::DrawTextLine(int x, int* y, const char* line, bool bold) {
+    gr_text(x, *y, line, bold);
+    *y += char_height_ + 4;
 }
 
-void ScreenRecoveryUI::DrawTextLines(int* y, const char* const* lines) {
+void ScreenRecoveryUI::DrawTextLines(int x, int* y, const char* const* lines) {
     for (size_t i = 0; lines != nullptr && lines[i] != nullptr; ++i) {
-        DrawTextLine(y, lines[i], false);
+        DrawTextLine(x, y, lines[i], false);
     }
 }
 
@@ -251,14 +250,15 @@
             property_get("ro.bootimage.build.fingerprint", recovery_fingerprint, "");
 
             SetColor(INFO);
-            DrawTextLine(&y, "Android Recovery", true);
+            DrawTextLine(TEXT_INDENT, &y, "Android Recovery", true);
             for (auto& chunk : android::base::Split(recovery_fingerprint, ":")) {
-                DrawTextLine(&y, chunk.c_str(), false);
+                DrawTextLine(TEXT_INDENT, &y, chunk.c_str(), false);
             }
-            DrawTextLines(&y, HasThreeButtons() ? REGULAR_HELP : LONG_PRESS_HELP);
+            DrawTextLines(TEXT_INDENT, &y,
+                    HasThreeButtons() ? REGULAR_HELP : LONG_PRESS_HELP);
 
             SetColor(HEADER);
-            DrawTextLines(&y, menu_headers_);
+            DrawTextLines(TEXT_INDENT, &y, menu_headers_);
 
             SetColor(MENU);
             DrawHorizontalRule(&y);
@@ -267,7 +267,7 @@
                 if (i == menu_sel) {
                     // Draw the highlight bar.
                     SetColor(IsLongPress() ? MENU_SEL_BG_ACTIVE : MENU_SEL_BG);
-                    gr_fill(0, y - 2, gr_fb_width(), y + char_height + 2);
+                    gr_fill(0, y - 2, gr_fb_width(), y + char_height_ + 2);
                     // Bold white text for the selected item.
                     SetColor(MENU_SEL_FG);
                     gr_text(4, y, menu_[i], true);
@@ -275,7 +275,7 @@
                 } else {
                     gr_text(4, y, menu_[i], false);
                 }
-                y += char_height + 4;
+                y += char_height_ + 4;
             }
             DrawHorizontalRule(&y);
         }
@@ -286,9 +286,9 @@
         SetColor(LOG);
         int row = (text_top_ + text_rows_ - 1) % text_rows_;
         size_t count = 0;
-        for (int ty = gr_fb_height() - char_height;
+        for (int ty = gr_fb_height() - char_height_;
              ty >= y && count < text_rows_;
-             ty -= char_height, ++count) {
+             ty -= char_height_, ++count) {
             gr_text(0, ty, text_[row], false);
             --row;
             if (row < 0) row = text_rows_ - 1;
@@ -394,9 +394,9 @@
 void ScreenRecoveryUI::Init() {
     gr_init();
 
-    gr_font_size(&char_width, &char_height);
-    text_rows_ = gr_fb_height() / char_height;
-    text_cols_ = gr_fb_width() / char_width;
+    gr_font_size(&char_width_, &char_height_);
+    text_rows_ = gr_fb_height() / char_height_;
+    text_cols_ = gr_fb_width() / char_width_;
 
     text_ = Alloc2d(text_rows_, text_cols_ + 1);
     file_viewer_text_ = Alloc2d(text_rows_, text_cols_ + 1);
diff --git a/screen_ui.h b/screen_ui.h
index 08a5f44..9e1b2df 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -71,9 +71,7 @@
     Icon currentIcon;
     int installingFrame;
     const char* locale;
-    bool rtl_locale;
 
-    pthread_mutex_t updateMutex;
     GRSurface* backgroundIcon[5];
     GRSurface* backgroundText[5];
     GRSurface** installation;
@@ -133,12 +131,17 @@
     void ClearText();
 
     void DrawHorizontalRule(int* y);
-    void DrawTextLine(int* y, const char* line, bool bold);
-    void DrawTextLines(int* y, const char* const* lines);
 
-    void LoadBitmap(const char* filename, GRSurface** surface);
     void LoadBitmapArray(const char* filename, int* frames, int* fps, GRSurface*** surface);
     void LoadLocalizedBitmap(const char* filename, GRSurface** surface);
+  protected:
+    int char_width_;
+    int char_height_;
+    pthread_mutex_t updateMutex;
+    bool rtl_locale;
+    void LoadBitmap(const char* filename, GRSurface** surface);
+    void DrawTextLine(int x, int* y, const char* line, bool bold);
+    void DrawTextLines(int x, int* y, const char* const* lines);
 };
 
 #endif  // RECOVERY_UI_H
diff --git a/tests/Android.mk b/tests/Android.mk
index 262fb8b..9d83c9a 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -29,18 +29,27 @@
 # Component tests
 include $(CLEAR_VARS)
 LOCAL_CLANG := true
+LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 LOCAL_MODULE := recovery_component_test
 LOCAL_C_INCLUDES := bootable/recovery
-LOCAL_SRC_FILES := component/verifier_test.cpp
+LOCAL_SRC_FILES := \
+    component/verifier_test.cpp \
+    component/applypatch_test.cpp
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 LOCAL_STATIC_LIBRARIES := \
+    libapplypatch \
+    libotafault \
+    libmtdutils \
     libbase \
     libverifier \
     libmincrypt \
+    libcrypto_static \
     libminui \
     libminzip \
     libcutils \
+    libbz \
+    libz \
     libc
 
 testdata_out_path := $(TARGET_OUT_DATA_NATIVE_TESTS)/recovery
diff --git a/tests/common/test_constants.h b/tests/common/test_constants.h
new file mode 100644
index 0000000..3490f68
--- /dev/null
+++ b/tests/common/test_constants.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 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 agree 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 _OTA_TEST_CONSTANTS_H
+#define _OTA_TEST_CONSTANTS_H
+
+#if defined(__LP64__)
+#define NATIVE_TEST_PATH "/nativetest64"
+#else
+#define NATIVE_TEST_PATH "/nativetest"
+#endif
+
+#endif
diff --git a/tests/component/applypatch_test.cpp b/tests/component/applypatch_test.cpp
new file mode 100644
index 0000000..b44ddd1
--- /dev/null
+++ b/tests/component/applypatch_test.cpp
@@ -0,0 +1,392 @@
+/*
+ * Copyright (C) 2016 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 agree 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 <fcntl.h>
+#include <gtest/gtest.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include <string>
+
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
+#include <android-base/test_utils.h>
+
+#include "applypatch/applypatch.h"
+#include "common/test_constants.h"
+#include "openssl/sha.h"
+#include "print_sha1.h"
+
+static const std::string DATA_PATH = getenv("ANDROID_DATA");
+static const std::string TESTDATA_PATH = "/recovery/testdata";
+static const std::string WORK_FS = "/data";
+
+static std::string sha1sum(const std::string& fname) {
+    uint8_t digest[SHA_DIGEST_LENGTH];
+    std::string data;
+    android::base::ReadFileToString(fname, &data);
+
+    SHA1((const uint8_t*)data.c_str(), data.size(), digest);
+    return print_sha1(digest);
+}
+
+static void mangle_file(const std::string& fname) {
+    FILE* fh = fopen(&fname[0], "w");
+    int r;
+    for (int i=0; i < 1024; i++) {
+        r = rand();
+        fwrite(&r, sizeof(short), 1, fh);
+    }
+    fclose(fh);
+}
+
+static bool file_cmp(std::string& f1, std::string& f2) {
+    std::string c1;
+    std::string c2;
+    android::base::ReadFileToString(f1, &c1);
+    android::base::ReadFileToString(f2, &c2);
+    return c1 == c2;
+}
+
+static std::string from_testdata_base(const std::string fname) {
+    return android::base::StringPrintf("%s%s%s/%s",
+            &DATA_PATH[0],
+            &NATIVE_TEST_PATH[0],
+            &TESTDATA_PATH[0],
+            &fname[0]);
+}
+
+class ApplyPatchTest : public ::testing::Test {
+    public:
+        static void SetUpTestCase() {
+            // set up files
+            old_file = from_testdata_base("old.file");
+            new_file = from_testdata_base("new.file");
+            patch_file = from_testdata_base("patch.bsdiff");
+            rand_file = "/cache/applypatch_test_rand.file";
+            cache_file = "/cache/saved.file";
+
+            // write stuff to rand_file
+            android::base::WriteStringToFile("hello", rand_file);
+
+            // set up SHA constants
+            old_sha1 = sha1sum(old_file);
+            new_sha1 = sha1sum(new_file);
+            srand(time(NULL));
+            bad_sha1_a = android::base::StringPrintf("%040x", rand());
+            bad_sha1_b = android::base::StringPrintf("%040x", rand());
+
+            struct stat st;
+            stat(&new_file[0], &st);
+            new_size = st.st_size;
+        }
+
+        static std::string old_file;
+        static std::string new_file;
+        static std::string rand_file;
+        static std::string cache_file;
+        static std::string patch_file;
+
+        static std::string old_sha1;
+        static std::string new_sha1;
+        static std::string bad_sha1_a;
+        static std::string bad_sha1_b;
+
+        static size_t new_size;
+};
+
+std::string ApplyPatchTest::old_file;
+std::string ApplyPatchTest::new_file;
+
+static void cp(std::string src, std::string tgt) {
+    std::string cmd = android::base::StringPrintf("cp %s %s",
+            &src[0],
+            &tgt[0]);
+    system(&cmd[0]);
+}
+
+static void backup_old() {
+    cp(ApplyPatchTest::old_file, ApplyPatchTest::cache_file);
+}
+
+static void restore_old() {
+    cp(ApplyPatchTest::cache_file, ApplyPatchTest::old_file);
+}
+
+class ApplyPatchCacheTest : public ApplyPatchTest {
+    public:
+        virtual void SetUp() {
+            backup_old();
+        }
+
+        virtual void TearDown() {
+            restore_old();
+        }
+};
+
+class ApplyPatchFullTest : public ApplyPatchCacheTest {
+    public:
+        static void SetUpTestCase() {
+            ApplyPatchTest::SetUpTestCase();
+            unsigned long free_kb = FreeSpaceForFile(&WORK_FS[0]);
+            ASSERT_GE(free_kb * 1024, new_size * 3 / 2);
+            output_f = new TemporaryFile();
+            output_loc = std::string(output_f->path);
+
+            struct FileContents fc;
+
+            ASSERT_EQ(0, LoadFileContents(&rand_file[0], &fc));
+            Value* patch1 = new Value();
+            patch1->type = VAL_BLOB;
+            patch1->size = fc.data.size();
+            patch1->data = static_cast<char*>(malloc(fc.data.size()));
+            memcpy(patch1->data, fc.data.data(), fc.data.size());
+            patches.push_back(patch1);
+
+            ASSERT_EQ(0, LoadFileContents(&patch_file[0], &fc));
+            Value* patch2 = new Value();
+            patch2->type = VAL_BLOB;
+            patch2->size = fc.st.st_size;
+            patch2->data = static_cast<char*>(malloc(fc.data.size()));
+            memcpy(patch2->data, fc.data.data(), fc.data.size());
+            patches.push_back(patch2);
+        }
+        static void TearDownTestCase() {
+            delete output_f;
+            for (auto it = patches.begin(); it != patches.end(); ++it) {
+                free((*it)->data);
+                delete *it;
+            }
+            patches.clear();
+        }
+
+        static std::vector<Value*> patches;
+        static TemporaryFile* output_f;
+        static std::string output_loc;
+};
+
+class ApplyPatchDoubleCacheTest : public ApplyPatchFullTest {
+    public:
+        virtual void SetUp() {
+            ApplyPatchCacheTest::SetUp();
+            cp(cache_file, "/cache/reallysaved.file");
+        }
+
+        virtual void TearDown() {
+            cp("/cache/reallysaved.file", cache_file);
+            ApplyPatchCacheTest::TearDown();
+        }
+};
+
+std::string ApplyPatchTest::rand_file;
+std::string ApplyPatchTest::patch_file;
+std::string ApplyPatchTest::cache_file;
+std::string ApplyPatchTest::old_sha1;
+std::string ApplyPatchTest::new_sha1;
+std::string ApplyPatchTest::bad_sha1_a;
+std::string ApplyPatchTest::bad_sha1_b;
+
+size_t ApplyPatchTest::new_size;
+
+std::vector<Value*> ApplyPatchFullTest::patches;
+TemporaryFile* ApplyPatchFullTest::output_f;
+std::string ApplyPatchFullTest::output_loc;
+
+TEST_F(ApplyPatchTest, CheckModeSingle) {
+    char* s = &old_sha1[0];
+    ASSERT_EQ(0, applypatch_check(&old_file[0], 1, &s));
+}
+
+TEST_F(ApplyPatchTest, CheckModeMultiple) {
+    char* argv[3] = {
+        &bad_sha1_a[0],
+        &old_sha1[0],
+        &bad_sha1_b[0]
+    };
+    ASSERT_EQ(0, applypatch_check(&old_file[0], 3, argv));
+}
+
+TEST_F(ApplyPatchTest, CheckModeFailure) {
+    char* argv[2] = {
+        &bad_sha1_a[0],
+        &bad_sha1_b[0]
+    };
+    ASSERT_NE(0, applypatch_check(&old_file[0], 2, argv));
+}
+
+TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedSingle) {
+    mangle_file(old_file);
+    char* s = &old_sha1[0];
+    ASSERT_EQ(0, applypatch_check(&old_file[0], 1, &s));
+}
+
+TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedMultiple) {
+    mangle_file(old_file);
+    char* argv[3] = {
+        &bad_sha1_a[0],
+        &old_sha1[0],
+        &bad_sha1_b[0]
+    };
+    ASSERT_EQ(0, applypatch_check(&old_file[0], 3, argv));
+}
+
+TEST_F(ApplyPatchCacheTest, CheckCacheCorruptedFailure) {
+    mangle_file(old_file);
+    char* argv[2] = {
+        &bad_sha1_a[0],
+        &bad_sha1_b[0]
+    };
+    ASSERT_NE(0, applypatch_check(&old_file[0], 2, argv));
+}
+
+TEST_F(ApplyPatchCacheTest, CheckCacheMissingSingle) {
+    unlink(&old_file[0]);
+    char* s = &old_sha1[0];
+    ASSERT_EQ(0, applypatch_check(&old_file[0], 1, &s));
+}
+
+TEST_F(ApplyPatchCacheTest, CheckCacheMissingMultiple) {
+    unlink(&old_file[0]);
+    char* argv[3] = {
+        &bad_sha1_a[0],
+        &old_sha1[0],
+        &bad_sha1_b[0]
+    };
+    ASSERT_EQ(0, applypatch_check(&old_file[0], 3, argv));
+}
+
+TEST_F(ApplyPatchCacheTest, CheckCacheMissingFailure) {
+    unlink(&old_file[0]);
+    char* argv[2] = {
+        &bad_sha1_a[0],
+        &bad_sha1_b[0]
+    };
+    ASSERT_NE(0, applypatch_check(&old_file[0], 2, argv));
+}
+
+TEST_F(ApplyPatchFullTest, ApplyInPlace) {
+    std::vector<char*> sha1s;
+    sha1s.push_back(&bad_sha1_a[0]);
+    sha1s.push_back(&old_sha1[0]);
+
+    int ap_result = applypatch(&old_file[0],
+            "-",
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_EQ(0, ap_result);
+    ASSERT_TRUE(file_cmp(old_file, new_file));
+    // reapply, applypatch is idempotent so it should succeed
+    ap_result = applypatch(&old_file[0],
+            "-",
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_EQ(0, ap_result);
+    ASSERT_TRUE(file_cmp(old_file, new_file));
+}
+
+TEST_F(ApplyPatchFullTest, ApplyInNewLocation) {
+    std::vector<char*> sha1s;
+    sha1s.push_back(&bad_sha1_a[0]);
+    sha1s.push_back(&old_sha1[0]);
+    int ap_result = applypatch(&old_file[0],
+            &output_loc[0],
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_EQ(0, ap_result);
+    ASSERT_TRUE(file_cmp(output_loc, new_file));
+    ap_result = applypatch(&old_file[0],
+            &output_loc[0],
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_EQ(0, ap_result);
+    ASSERT_TRUE(file_cmp(output_loc, new_file));
+}
+
+TEST_F(ApplyPatchFullTest, ApplyCorruptedInNewLocation) {
+    mangle_file(old_file);
+    std::vector<char*> sha1s;
+    sha1s.push_back(&bad_sha1_a[0]);
+    sha1s.push_back(&old_sha1[0]);
+    int ap_result = applypatch(&old_file[0],
+            &output_loc[0],
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_EQ(0, ap_result);
+    ASSERT_TRUE(file_cmp(output_loc, new_file));
+    ap_result = applypatch(&old_file[0],
+            &output_loc[0],
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_EQ(0, ap_result);
+    ASSERT_TRUE(file_cmp(output_loc, new_file));
+}
+
+TEST_F(ApplyPatchDoubleCacheTest, ApplyDoubleCorruptedInNewLocation) {
+    mangle_file(old_file);
+    mangle_file(cache_file);
+
+    std::vector<char*> sha1s;
+    sha1s.push_back(&bad_sha1_a[0]);
+    sha1s.push_back(&old_sha1[0]);
+    int ap_result = applypatch(&old_file[0],
+            &output_loc[0],
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_NE(0, ap_result);
+    ASSERT_FALSE(file_cmp(output_loc, new_file));
+    ap_result = applypatch(&old_file[0],
+            &output_loc[0],
+            &new_sha1[0],
+            new_size,
+            2,
+            sha1s.data(),
+            patches.data(),
+            nullptr);
+    ASSERT_NE(0, ap_result);
+    ASSERT_FALSE(file_cmp(output_loc, new_file));
+}
diff --git a/tests/component/verifier_test.cpp b/tests/component/verifier_test.cpp
index d6f1e0b..c533b03 100644
--- a/tests/component/verifier_test.cpp
+++ b/tests/component/verifier_test.cpp
@@ -29,18 +29,13 @@
 #include <android-base/stringprintf.h>
 
 #include "common.h"
+#include "common/test_constants.h"
 #include "mincrypt/sha.h"
 #include "mincrypt/sha256.h"
 #include "minzip/SysUtil.h"
 #include "ui.h"
 #include "verifier.h"
 
-#if defined(__LP64__)
-#define NATIVE_TEST_PATH "/nativetest64"
-#else
-#define NATIVE_TEST_PATH "/nativetest"
-#endif
-
 static const char* DATA_PATH = getenv("ANDROID_DATA");
 static const char* TESTDATA_PATH = "/recovery/testdata/";
 
diff --git a/tests/testdata/new.file b/tests/testdata/new.file
new file mode 100644
index 0000000..cdeb8fd
--- /dev/null
+++ b/tests/testdata/new.file
Binary files differ
diff --git a/tests/testdata/old.file b/tests/testdata/old.file
new file mode 100644
index 0000000..166c873
--- /dev/null
+++ b/tests/testdata/old.file
Binary files differ
diff --git a/tests/testdata/patch.bsdiff b/tests/testdata/patch.bsdiff
new file mode 100644
index 0000000..b78d385
--- /dev/null
+++ b/tests/testdata/patch.bsdiff
Binary files differ
diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp
index abbd3e5..9e3416b 100644
--- a/uncrypt/uncrypt.cpp
+++ b/uncrypt/uncrypt.cpp
@@ -39,6 +39,53 @@
 // Recovery can take this block map file and retrieve the underlying
 // file data to use as an update package.
 
+/**
+ * In addition to the uncrypt work, uncrypt also takes care of setting and
+ * clearing the bootloader control block (BCB) at /misc partition.
+ *
+ * uncrypt is triggered as init services on demand. It uses socket to
+ * communicate with its caller (i.e. system_server). The socket is managed by
+ * init (i.e. created prior to the service starts, and destroyed when uncrypt
+ * exits).
+ *
+ * Below is the uncrypt protocol.
+ *
+ *    a. caller                 b. init                    c. uncrypt
+ * ---------------            ------------               --------------
+ *  a1. ctl.start:
+ *    setup-bcb /
+ *    clear-bcb /
+ *    uncrypt
+ *
+ *                         b2. create socket at
+ *                           /dev/socket/uncrypt
+ *
+ *                                                   c3. listen and accept
+ *
+ *  a4. send a 4-byte int
+ *    (message length)
+ *                                                   c5. receive message length
+ *  a6. send message
+ *                                                   c7. receive message
+ *                                                   c8. <do the work; may send
+ *                                                      the progress>
+ *  a9. <may handle progress>
+ *                                                   c10. <upon finishing>
+ *                                                     send "100" or "-1"
+ *
+ *  a11. receive status code
+ *  a12. send a 4-byte int to
+ *    ack the receive of the
+ *    final status code
+ *                                                   c13. receive and exit
+ *
+ *                          b14. destroy the socket
+ *
+ * Note that a12 and c13 are necessary to ensure a11 happens before the socket
+ * gets destroyed in b14.
+ */
+
+#include <arpa/inet.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
@@ -49,6 +96,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -64,6 +112,7 @@
 #include <android-base/unique_fd.h>
 #include <cutils/android_reboot.h>
 #include <cutils/properties.h>
+#include <cutils/sockets.h>
 #include <fs_mgr.h>
 
 #define LOG_TAG "uncrypt"
@@ -73,12 +122,21 @@
 
 #define WINDOW_SIZE 5
 
+// uncrypt provides three services: SETUP_BCB, CLEAR_BCB and UNCRYPT.
+//
+// SETUP_BCB and CLEAR_BCB services use socket communication and do not rely
+// on /cache partitions. They will handle requests to reboot into recovery
+// (for applying updates for non-A/B devices, or factory resets for all
+// devices).
+//
+// UNCRYPT service still needs files on /cache partition (UNCRYPT_PATH_FILE
+// and CACHE_BLOCK_MAP). It will be working (and needed) only for non-A/B
+// devices, on which /cache partitions always exist.
 static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map";
-static const std::string COMMAND_FILE = "/cache/recovery/command";
-static const std::string STATUS_FILE = "/cache/recovery/uncrypt_status";
 static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file";
+static const std::string UNCRYPT_SOCKET = "uncrypt";
 
-static struct fstab* fstab = NULL;
+static struct fstab* fstab = nullptr;
 
 static int write_at_offset(unsigned char* buffer, size_t size, int wfd, off64_t offset) {
     if (TEMP_FAILURE_RETRY(lseek64(wfd, offset, SEEK_SET)) == -1) {
@@ -152,6 +210,11 @@
     return NULL;
 }
 
+static bool write_status_to_socket(int status, int socket) {
+    int status_out = htonl(status);
+    return android::base::WriteFully(socket, &status_out, sizeof(int));
+}
+
 // Parse uncrypt_file to find the update package name.
 static bool find_uncrypt_package(const std::string& uncrypt_path_file, std::string* package_name) {
     CHECK(package_name != nullptr);
@@ -167,7 +230,7 @@
 }
 
 static int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
-                             bool encrypted, int status_fd) {
+                             bool encrypted, int socket) {
     std::string err;
     if (!android::base::RemoveFileIfExists(map_file, &err)) {
         ALOGE("failed to remove the existing map file %s: %s", map_file, err.c_str());
@@ -181,9 +244,9 @@
         return -1;
     }
 
-    // Make sure we can write to the status_file.
-    if (!android::base::WriteStringToFd("0\n", status_fd)) {
-        ALOGE("failed to update \"%s\"\n", STATUS_FILE.c_str());
+    // Make sure we can write to the socket.
+    if (!write_status_to_socket(0, socket)) {
+        ALOGE("failed to write to socket %d\n", socket);
         return -1;
     }
 
@@ -235,8 +298,8 @@
         // Update the status file, progress must be between [0, 99].
         int progress = static_cast<int>(100 * (double(pos) / double(sb.st_size)));
         if (progress > last_progress) {
-          last_progress = progress;
-          android::base::WriteStringToFd(std::to_string(progress) + "\n", status_fd);
+            last_progress = progress;
+            write_status_to_socket(progress, socket);
         }
 
         if ((tail+1) % WINDOW_SIZE == head) {
@@ -350,15 +413,12 @@
 }
 
 static std::string get_misc_blk_device() {
-    struct fstab* fstab = read_fstab();
     if (fstab == nullptr) {
         return "";
     }
-    for (int i = 0; i < fstab->num_entries; ++i) {
-        fstab_rec* v = &fstab->recs[i];
-        if (v->mount_point != nullptr && strcmp(v->mount_point, "/misc") == 0) {
-            return v->blk_device;
-        }
+    struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, "/misc");
+    if (rec != nullptr) {
+        return rec->blk_device;
     }
     return "";
 }
@@ -404,17 +464,7 @@
     return 0;
 }
 
-static void reboot_to_recovery() {
-    ALOGI("rebooting to recovery");
-    property_set("sys.powerctl", "reboot,recovery");
-    while (true) {
-      pause();
-    }
-    ALOGE("reboot didn't succeed?");
-}
-
-static int uncrypt(const char* input_path, const char* map_file, int status_fd) {
-
+static int uncrypt(const char* input_path, const char* map_file, const int socket) {
     ALOGI("update package is \"%s\"", input_path);
 
     // Turn the name of the file we're supposed to convert into an
@@ -425,10 +475,6 @@
         return 1;
     }
 
-    if (read_fstab() == NULL) {
-        return 1;
-    }
-
     bool encryptable;
     bool encrypted;
     const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
@@ -452,7 +498,7 @@
     // and /sdcard we leave the file alone.
     if (strncmp(path, "/data/", 6) == 0) {
         ALOGI("writing block map %s", map_file);
-        if (produce_block_map(path, map_file, blk_dev, encrypted, status_fd) != 0) {
+        if (produce_block_map(path, map_file, blk_dev, encrypted, socket) != 0) {
             return 1;
         }
     }
@@ -460,74 +506,66 @@
     return 0;
 }
 
-static int uncrypt_wrapper(const char* input_path, const char* map_file,
-                           const std::string& status_file) {
-    // The pipe has been created by the system server.
-    android::base::unique_fd status_fd(open(status_file.c_str(),
-                                            O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR));
-    if (status_fd == -1) {
-        ALOGE("failed to open pipe \"%s\": %s", status_file.c_str(), strerror(errno));
-        return 1;
-    }
-
+static bool uncrypt_wrapper(const char* input_path, const char* map_file, const int socket) {
     std::string package;
     if (input_path == nullptr) {
         if (!find_uncrypt_package(UNCRYPT_PATH_FILE, &package)) {
-            android::base::WriteStringToFd("-1\n", status_fd);
-            return 1;
+            write_status_to_socket(-1, socket);
+            return false;
         }
         input_path = package.c_str();
     }
     CHECK(map_file != nullptr);
-    int status = uncrypt(input_path, map_file, status_fd);
+    int status = uncrypt(input_path, map_file, socket);
     if (status != 0) {
-        android::base::WriteStringToFd("-1\n", status_fd);
-        return 1;
+        write_status_to_socket(-1, socket);
+        return false;
     }
-    android::base::WriteStringToFd("100\n", status_fd);
-    return 0;
+    write_status_to_socket(100, socket);
+    return true;
 }
 
-static int clear_bcb(const std::string& status_file) {
-    android::base::unique_fd status_fd(open(status_file.c_str(),
-                                            O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR));
-    if (status_fd == -1) {
-        ALOGE("failed to open pipe \"%s\": %s", status_file.c_str(), strerror(errno));
-        return 1;
-    }
+static bool clear_bcb(const int socket) {
     bootloader_message boot = {};
     if (write_bootloader_message(&boot) != 0) {
-        android::base::WriteStringToFd("-1\n", status_fd);
-        return 1;
+        write_status_to_socket(-1, socket);
+        return false;
     }
-    android::base::WriteStringToFd("100\n", status_fd);
-    return 0;
+    write_status_to_socket(100, socket);
+    return true;
 }
 
-static int setup_bcb(const std::string& command_file, const std::string& status_file) {
-    android::base::unique_fd status_fd(open(status_file.c_str(),
-                                            O_WRONLY | O_CREAT | O_SYNC, S_IRUSR | S_IWUSR));
-    if (status_fd == -1) {
-        ALOGE("failed to open pipe \"%s\": %s", status_file.c_str(), strerror(errno));
-        return 1;
+static bool setup_bcb(const int socket) {
+    // c5. receive message length
+    int length;
+    if (!android::base::ReadFully(socket, &length, 4)) {
+        ALOGE("failed to read the length: %s", strerror(errno));
+        return false;
     }
+    length = ntohl(length);
+
+    // c7. receive message
     std::string content;
-    if (!android::base::ReadFileToString(command_file, &content)) {
-        ALOGE("failed to read \"%s\": %s", command_file.c_str(), strerror(errno));
-        android::base::WriteStringToFd("-1\n", status_fd);
-        return 1;
+    content.resize(length);
+    if (!android::base::ReadFully(socket, &content[0], length)) {
+        ALOGE("failed to read the length: %s", strerror(errno));
+        return false;
     }
+    ALOGI("  received command: [%s] (%zu)", content.c_str(), content.size());
+
+    // c8. setup the bcb command
     bootloader_message boot = {};
     strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
     strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
     strlcat(boot.recovery, content.c_str(), sizeof(boot.recovery));
     if (write_bootloader_message(&boot) != 0) {
         ALOGE("failed to set bootloader message");
-        android::base::WriteStringToFd("-1\n", status_fd);
-        return 1;
+        write_status_to_socket(-1, socket);
+        return false;
     }
-    android::base::WriteStringToFd("100\n", status_fd);
-    return 0;
+    // c10. send "100" status
+    write_status_to_socket(100, socket);
+    return true;
 }
 
 static int read_bcb() {
@@ -544,32 +582,81 @@
 static void usage(const char* exename) {
     fprintf(stderr, "Usage of %s:\n", exename);
     fprintf(stderr, "%s [<package_path> <map_file>]  Uncrypt ota package.\n", exename);
-    fprintf(stderr, "%s --reboot  Clear BCB data and reboot to recovery.\n", exename);
     fprintf(stderr, "%s --clear-bcb  Clear BCB data in misc partition.\n", exename);
     fprintf(stderr, "%s --setup-bcb  Setup BCB data by command file.\n", exename);
     fprintf(stderr, "%s --read-bcb   Read BCB data from misc partition.\n", exename);
 }
 
 int main(int argc, char** argv) {
-    if (argc == 2) {
-        if (strcmp(argv[1], "--reboot") == 0) {
-            reboot_to_recovery();
-        } else if (strcmp(argv[1], "--clear-bcb") == 0) {
-            return clear_bcb(STATUS_FILE);
-        } else if (strcmp(argv[1], "--setup-bcb") == 0) {
-            return setup_bcb(COMMAND_FILE, STATUS_FILE);
-        } else if (strcmp(argv[1], "--read-bcb") == 0) {
-            return read_bcb();
-        }
-    } else if (argc == 1 || argc == 3) {
-        const char* input_path = nullptr;
-        const char* map_file = CACHE_BLOCK_MAP.c_str();
-        if (argc == 3) {
-            input_path = argv[1];
-            map_file = argv[2];
-        }
-        return uncrypt_wrapper(input_path, map_file, STATUS_FILE);
+    enum { UNCRYPT, SETUP_BCB, CLEAR_BCB } action;
+    const char* input_path = nullptr;
+    const char* map_file = CACHE_BLOCK_MAP.c_str();
+
+    if (argc == 2 && strcmp(argv[1], "--clear-bcb") == 0) {
+        action = CLEAR_BCB;
+    } else if (argc == 2 && strcmp(argv[1], "--setup-bcb") == 0) {
+        action = SETUP_BCB;
+    } else if (argc ==2 && strcmp(argv[1], "--read-bcb") == 0) {
+        return read_bcb();
+    } else if (argc == 1) {
+        action = UNCRYPT;
+    } else if (argc == 3) {
+        input_path = argv[1];
+        map_file = argv[2];
+        action = UNCRYPT;
+    } else {
+        usage(argv[0]);
+        return 2;
     }
-    usage(argv[0]);
-    return 2;
+
+    if ((fstab = read_fstab()) == nullptr) {
+        return 1;
+    }
+
+    // c3. The socket is created by init when starting the service. uncrypt
+    // will use the socket to communicate with its caller.
+    unique_fd service_socket(android_get_control_socket(UNCRYPT_SOCKET.c_str()));
+    if (!service_socket) {
+        ALOGE("failed to open socket \"%s\": %s", UNCRYPT_SOCKET.c_str(), strerror(errno));
+        return 1;
+    }
+    fcntl(service_socket.get(), F_SETFD, FD_CLOEXEC);
+
+    if (listen(service_socket.get(), 1) == -1) {
+        ALOGE("failed to listen on socket %d: %s", service_socket.get(), strerror(errno));
+        return 1;
+    }
+
+    unique_fd socket_fd(accept4(service_socket.get(), nullptr, nullptr, SOCK_CLOEXEC));
+    if (!socket_fd) {
+        ALOGE("failed to accept on socket %d: %s", service_socket.get(), strerror(errno));
+        return 1;
+    }
+
+    bool success = false;
+    switch (action) {
+        case UNCRYPT:
+            success = uncrypt_wrapper(input_path, map_file, socket_fd.get());
+            break;
+        case SETUP_BCB:
+            success = setup_bcb(socket_fd.get());
+            break;
+        case CLEAR_BCB:
+            success = clear_bcb(socket_fd.get());
+            break;
+        default:  // Should never happen.
+            ALOGE("Invalid uncrypt action code: %d", action);
+            return 1;
+    }
+
+    // c13. Read a 4-byte code from the client before uncrypt exits. This is to
+    // ensure the client to receive the last status code before the socket gets
+    // destroyed.
+    int code;
+    if (android::base::ReadFully(socket_fd.get(), &code, 4)) {
+        ALOGI("  received %d, exiting now", code);
+    } else {
+        ALOGE("failed to read the code: %s", strerror(errno));
+    }
+    return success ? 0 : 1;
 }
diff --git a/uncrypt/uncrypt.rc b/uncrypt/uncrypt.rc
index b07c1da..52f564e 100644
--- a/uncrypt/uncrypt.rc
+++ b/uncrypt/uncrypt.rc
@@ -1,19 +1,17 @@
 service uncrypt /system/bin/uncrypt
     class main
-    disabled
-    oneshot
-
-service pre-recovery /system/bin/uncrypt --reboot
-    class main
+    socket uncrypt stream 600 system system
     disabled
     oneshot
 
 service setup-bcb /system/bin/uncrypt --setup-bcb
     class main
+    socket uncrypt stream 600 system system
     disabled
     oneshot
 
 service clear-bcb /system/bin/uncrypt --clear-bcb
     class main
+    socket uncrypt stream 600 system system
     disabled
-    oneshot
\ No newline at end of file
+    oneshot
diff --git a/wear_touch.cpp b/wear_touch.cpp
new file mode 100644
index 0000000..f22d40b
--- /dev/null
+++ b/wear_touch.cpp
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2016 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 "common.h"
+#include "wear_touch.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include <linux/input.h>
+
+#define DEVICE_PATH "/dev/input"
+
+WearSwipeDetector::WearSwipeDetector(int low, int high, OnSwipeCallback callback, void* cookie):
+    mLowThreshold(low),
+    mHighThreshold(high),
+    mCallback(callback),
+    mCookie(cookie),
+    mCurrentSlot(-1) {
+    pthread_create(&mThread, NULL, touch_thread, this);
+}
+
+WearSwipeDetector::~WearSwipeDetector() {
+}
+
+void WearSwipeDetector::detect(int dx, int dy) {
+    enum SwipeDirection direction;
+
+    if (abs(dy) < mLowThreshold && abs(dx) > mHighThreshold) {
+        direction = dx < 0 ? LEFT : RIGHT;
+    } else if (abs(dx) < mLowThreshold && abs(dy) > mHighThreshold) {
+        direction = dy < 0 ? UP : DOWN;
+    } else {
+        LOGD("Ignore %d %d\n", dx, dy);
+        return;
+    }
+
+    LOGD("Swipe direction=%d\n", direction);
+    mCallback(mCookie, direction);
+}
+
+void WearSwipeDetector::process(struct input_event *event) {
+    if (mCurrentSlot < 0) {
+        mCallback(mCookie, UP);
+        mCurrentSlot = 0;
+    }
+
+    if (event->type == EV_ABS) {
+        if (event->code == ABS_MT_SLOT)
+            mCurrentSlot = event->value;
+
+        // Ignore other fingers
+        if (mCurrentSlot > 0) {
+            return;
+        }
+
+        switch (event->code) {
+        case ABS_MT_POSITION_X:
+            mX = event->value;
+            mFingerDown = true;
+            break;
+
+        case ABS_MT_POSITION_Y:
+            mY = event->value;
+            mFingerDown = true;
+            break;
+
+        case ABS_MT_TRACKING_ID:
+            if (event->value < 0)
+                mFingerDown = false;
+            break;
+        }
+    } else if (event->type == EV_SYN) {
+        if (event->code == SYN_REPORT) {
+            if (mFingerDown && !mSwiping) {
+                mStartX = mX;
+                mStartY = mY;
+                mSwiping = true;
+            } else if (!mFingerDown && mSwiping) {
+                mSwiping = false;
+                detect(mX - mStartX, mY - mStartY);
+            }
+        }
+    }
+}
+
+void WearSwipeDetector::run() {
+    int fd = findDevice(DEVICE_PATH);
+    if (fd < 0) {
+        LOGE("no input devices found\n");
+        return;
+    }
+
+    struct input_event event;
+    while (read(fd, &event, sizeof(event)) == sizeof(event)) {
+        process(&event);
+    }
+
+    close(fd);
+}
+
+void* WearSwipeDetector::touch_thread(void* cookie) {
+    ((WearSwipeDetector*)cookie)->run();
+    return NULL;
+}
+
+#define test_bit(bit, array)    (array[bit/8] & (1<<(bit%8)))
+
+int WearSwipeDetector::openDevice(const char *device) {
+    int fd = open(device, O_RDONLY);
+    if (fd < 0) {
+        LOGE("could not open %s, %s\n", device, strerror(errno));
+        return false;
+    }
+
+    char name[80];
+    name[sizeof(name) - 1] = '\0';
+    if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
+        LOGE("could not get device name for %s, %s\n", device, strerror(errno));
+        name[0] = '\0';
+    }
+
+    uint8_t bits[512];
+    memset(bits, 0, sizeof(bits));
+    int ret = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(bits)), bits);
+    if (ret > 0) {
+        if (test_bit(ABS_MT_POSITION_X, bits) && test_bit(ABS_MT_POSITION_Y, bits)) {
+            LOGD("Found %s %s\n", device, name);
+            return fd;
+        }
+    }
+
+    close(fd);
+    return -1;
+}
+
+int WearSwipeDetector::findDevice(const char* path) {
+    DIR* dir = opendir(path);
+    if (dir == NULL) {
+        LOGE("Could not open directory %s", path);
+        return false;
+    }
+
+    struct dirent* entry;
+    int ret = -1;
+    while (ret < 0 && (entry = readdir(dir)) != NULL) {
+        if (entry->d_name[0] == '.') continue;
+
+        char device[PATH_MAX];
+        device[PATH_MAX-1] = '\0';
+        snprintf(device, PATH_MAX-1, "%s/%s", path, entry->d_name);
+
+        ret = openDevice(device);
+    }
+
+    closedir(dir);
+    return ret;
+}
+
diff --git a/wear_touch.h b/wear_touch.h
new file mode 100644
index 0000000..9a1d315
--- /dev/null
+++ b/wear_touch.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2016 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 __WEAR_TOUCH_H
+#define __WEAR_TOUCH_H
+
+#include <pthread.h>
+
+class WearSwipeDetector {
+
+public:
+    enum SwipeDirection { UP, DOWN, RIGHT, LEFT };
+    typedef void (*OnSwipeCallback)(void* cookie, enum SwipeDirection direction);
+
+    WearSwipeDetector(int low, int high, OnSwipeCallback cb, void* cookie);
+    ~WearSwipeDetector();
+
+private:
+    void run();
+    void process(struct input_event *event);
+    void detect(int dx, int dy);
+
+    pthread_t mThread;
+    static void* touch_thread(void* cookie);
+
+    int findDevice(const char* path);
+    int openDevice(const char* device);
+
+    int mLowThreshold;
+    int mHighThreshold;
+
+    OnSwipeCallback mCallback;
+    void *mCookie;
+
+    int mX;
+    int mY;
+    int mStartX;
+    int mStartY;
+
+    int mCurrentSlot;
+    bool mFingerDown;
+    bool mSwiping;
+};
+
+#endif // __WEAR_TOUCH_H
diff --git a/wear_ui.cpp b/wear_ui.cpp
index 50aeb38..2502313 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -16,9 +16,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <pthread.h>
 #include <stdarg.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
@@ -31,14 +29,10 @@
 
 #include "common.h"
 #include "device.h"
-#include "minui/minui.h"
 #include "wear_ui.h"
-#include "ui.h"
 #include "cutils/properties.h"
 #include "android-base/strings.h"
-
-static int char_width;
-static int char_height;
+#include "android-base/stringprintf.h"
 
 // There's only (at most) one of these objects, and global callbacks
 // (for pthread_create, and the input event system) need to find it,
@@ -65,7 +59,6 @@
     currentIcon(NONE),
     intro_done(false),
     current_frame(0),
-    rtl_locale(false),
     progressBarType(EMPTY),
     progressScopeStart(0),
     progressScopeSize(0),
@@ -84,7 +77,6 @@
     for (size_t i = 0; i < 5; i++)
         backgroundIcon[i] = NULL;
 
-    pthread_mutex_init(&updateMutex, NULL);
     self = this;
 }
 
@@ -148,41 +140,6 @@
     }
 }
 
-void WearRecoveryUI::SetColor(UIElement e) {
-    switch (e) {
-        case HEADER:
-            gr_color(247, 0, 6, 255);
-            break;
-        case MENU:
-        case MENU_SEL_BG:
-            gr_color(0, 106, 157, 255);
-            break;
-        case MENU_SEL_FG:
-            gr_color(255, 255, 255, 255);
-            break;
-        case LOG:
-            gr_color(249, 194, 0, 255);
-            break;
-        case TEXT_FILL:
-            gr_color(0, 0, 0, 160);
-            break;
-        default:
-            gr_color(255, 255, 255, 255);
-            break;
-    }
-}
-
-void WearRecoveryUI::DrawTextLine(int x, int* y, const char* line, bool bold) {
-    gr_text(x, *y, line, bold);
-    *y += char_height + 4;
-}
-
-void WearRecoveryUI::DrawTextLines(int x, int* y, const char* const* lines) {
-    for (size_t i = 0; lines != nullptr && lines[i] != nullptr; ++i) {
-        DrawTextLine(x, y, lines[i], false);
-    }
-}
-
 static const char* HEADERS[] = {
     "Swipe up/down to move.",
     "Swipe left/right to select.",
@@ -221,7 +178,7 @@
             if (menu_items > menu_end - menu_start) {
                 sprintf(cur_selection_str, "Current item: %d/%d", menu_sel + 1, menu_items);
                 gr_text(x+4, y, cur_selection_str, 1);
-                y += char_height+4;
+                y += char_height_+4;
             }
 
             // Menu begins here
@@ -232,7 +189,7 @@
                 if (i == menu_sel) {
                     // draw the highlight bar
                     SetColor(MENU_SEL_BG);
-                    gr_fill(x, y-2, gr_fb_width()-x, y+char_height+2);
+                    gr_fill(x, y-2, gr_fb_width()-x, y+char_height_+2);
                     // white text of selected item
                     SetColor(MENU_SEL_FG);
                     if (menu[i][0]) gr_text(x+4, y, menu[i], 1);
@@ -240,7 +197,7 @@
                 } else {
                     if (menu[i][0]) gr_text(x+4, y, menu[i], 0);
                 }
-                y += char_height+4;
+                y += char_height_+4;
             }
             SetColor(MENU);
             y += 4;
@@ -256,9 +213,9 @@
         int ty;
         int row = (text_top+text_rows-1) % text_rows;
         size_t count = 0;
-        for (int ty = gr_fb_height() - char_height - outer_height;
+        for (int ty = gr_fb_height() - char_height_ - outer_height;
              ty > y+2 && count < text_rows;
-             ty -= char_height, ++count) {
+             ty -= char_height_, ++count) {
             gr_text(x+4, ty, text[row], 0);
             --row;
             if (row < 0) row = text_rows-1;
@@ -324,26 +281,19 @@
     }
 }
 
-void WearRecoveryUI::LoadBitmap(const char* filename, GRSurface** surface) {
-    int result = res_create_display_surface(filename, surface);
-    if (result < 0) {
-        LOGE("missing bitmap %s\n(Code %d)\n", filename, result);
-    }
-}
-
 void WearRecoveryUI::Init()
 {
     gr_init();
 
-    gr_font_size(&char_width, &char_height);
+    gr_font_size(&char_width_, &char_height_);
 
     text_col = text_row = 0;
-    text_rows = (gr_fb_height()) / char_height;
-    visible_text_rows = (gr_fb_height() - (outer_height * 2)) / char_height;
+    text_rows = (gr_fb_height()) / char_height_;
+    visible_text_rows = (gr_fb_height() - (outer_height * 2)) / char_height_;
     if (text_rows > kMaxRows) text_rows = kMaxRows;
     text_top = 1;
 
-    text_cols = (gr_fb_width() - (outer_width * 2)) / char_width;
+    text_cols = (gr_fb_width() - (outer_width * 2)) / char_width_;
     if (text_cols > kMaxCols - 1) text_cols = kMaxCols - 1;
 
     LoadBitmap("icon_installing", &backgroundIcon[INSTALLING_UPDATE]);
@@ -369,29 +319,6 @@
     RecoveryUI::Init();
 }
 
-void WearRecoveryUI::SetLocale(const char* locale) {
-    if (locale) {
-        char* lang = strdup(locale);
-        for (char* p = lang; *p; ++p) {
-            if (*p == '_') {
-                *p = '\0';
-                break;
-            }
-        }
-
-        // A bit cheesy: keep an explicit list of supported languages
-        // that are RTL.
-        if (strcmp(lang, "ar") == 0 ||   // Arabic
-            strcmp(lang, "fa") == 0 ||   // Persian (Farsi)
-            strcmp(lang, "he") == 0 ||   // Hebrew (new language code)
-            strcmp(lang, "iw") == 0 ||   // Hebrew (old language code)
-            strcmp(lang, "ur") == 0) {   // Urdu
-            rtl_locale = true;
-        }
-        free(lang);
-    }
-}
-
 void WearRecoveryUI::SetBackground(Icon icon)
 {
     pthread_mutex_lock(&updateMutex);
@@ -653,3 +580,35 @@
     }
     pthread_mutex_unlock(&updateMutex);
 }
+
+void WearRecoveryUI::PrintOnScreenOnly(const char *fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    PrintV(fmt, false, ap);
+    va_end(ap);
+}
+
+void WearRecoveryUI::PrintV(const char* fmt, bool copy_to_stdout, va_list ap) {
+    std::string str;
+    android::base::StringAppendV(&str, fmt, ap);
+
+    if (copy_to_stdout) {
+        fputs(str.c_str(), stdout);
+    }
+
+    pthread_mutex_lock(&updateMutex);
+    if (text_rows > 0 && text_cols > 0) {
+        for (const char* ptr = str.c_str(); *ptr != '\0'; ++ptr) {
+            if (*ptr == '\n' || text_col >= text_cols) {
+                text[text_row][text_col] = '\0';
+                text_col = 0;
+                text_row = (text_row + 1) % text_rows;
+                if (text_row == text_top) text_top = (text_top + 1) % text_rows;
+            }
+            if (*ptr != '\n') text[text_row][text_col++] = *ptr;
+        }
+        text[text_row][text_col] = '\0';
+        update_screen_locked();
+    }
+    pthread_mutex_unlock(&updateMutex);
+}
diff --git a/wear_ui.h b/wear_ui.h
index 63c1b6e..e2d6fe0 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -17,19 +17,13 @@
 #ifndef RECOVERY_WEAR_UI_H
 #define RECOVERY_WEAR_UI_H
 
-#include <pthread.h>
-#include <stdio.h>
+#include "screen_ui.h"
 
-#include "ui.h"
-#include "minui/minui.h"
-
-class WearRecoveryUI : public RecoveryUI {
+class WearRecoveryUI : public ScreenRecoveryUI {
   public:
     WearRecoveryUI();
 
     void Init();
-    void SetLocale(const char* locale);
-
     // overall recovery state ("background image")
     void SetBackground(Icon icon);
 
@@ -47,6 +41,7 @@
 
     // printing messages
     void Print(const char* fmt, ...);
+    void PrintOnScreenOnly(const char* fmt, ...) __printflike(2, 3);
     void ShowFile(const char* filename);
     void ShowFile(FILE* fp);
 
@@ -58,9 +53,6 @@
 
     void Redraw();
 
-    enum UIElement { HEADER, MENU, MENU_SEL_BG, MENU_SEL_FG, LOG, TEXT_FILL };
-    virtual void SetColor(UIElement e);
-
   protected:
     int progress_bar_height, progress_bar_width;
 
@@ -89,9 +81,6 @@
 
     int current_frame;
 
-    bool rtl_locale;
-
-    pthread_mutex_t updateMutex;
     GRSurface* backgroundIcon[5];
     GRSurface* *introFrames;
     GRSurface* *loopFrames;
@@ -128,11 +117,9 @@
     void update_screen_locked();
     static void* progress_thread(void* cookie);
     void progress_loop();
-    void LoadBitmap(const char* filename, GRSurface** surface);
     void PutChar(char);
     void ClearText();
-    void DrawTextLine(int x, int* y, const char* line, bool bold);
-    void DrawTextLines(int x, int* y, const char* const* lines);
+    void PrintV(const char*, bool, va_list);
 };
 
 #endif  // RECOVERY_WEAR_UI_H