diff --git a/Android.mk b/Android.mk
index 4da34ee..4477fef 100644
--- a/Android.mk
+++ b/Android.mk
@@ -64,6 +64,7 @@
     system/core/adb \
 
 LOCAL_STATIC_LIBRARIES := \
+    libbatterymonitor \
     libext4_utils_static \
     libsparse_static \
     libminzip \
@@ -77,11 +78,14 @@
     libfs_mgr \
     libbase \
     libcutils \
+    libutils \
     liblog \
     libselinux \
     libm \
     libc
 
+LOCAL_HAL_STATIC_LIBRARIES := libhealthd
+
 ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
     LOCAL_CFLAGS += -DUSE_EXT4
     LOCAL_C_INCLUDES += system/extras/ext4_utils
diff --git a/applypatch/libimgpatch.pc b/applypatch/libimgpatch.pc
new file mode 100644
index 0000000..e500293
--- /dev/null
+++ b/applypatch/libimgpatch.pc
@@ -0,0 +1,6 @@
+# This file is for libimgpatch in Chrome OS.
+
+Name: libimgpatch
+Description: Apply imgdiff patch
+Version: 0.0.1
+Libs: -limgpatch -lbz2 -lz
diff --git a/install.h b/install.h
index 680499d..f92f061 100644
--- a/install.h
+++ b/install.h
@@ -23,7 +23,7 @@
 extern "C" {
 #endif
 
-enum { INSTALL_SUCCESS, INSTALL_ERROR, INSTALL_CORRUPT, INSTALL_NONE };
+enum { INSTALL_SUCCESS, INSTALL_ERROR, INSTALL_CORRUPT, INSTALL_NONE, INSTALL_SKIPPED };
 // Install the package specified by root_path.  If INSTALL_SUCCESS is
 // returned and *wipe_cache is true on exit, caller should wipe the
 // cache partition.
diff --git a/minui/resources.cpp b/minui/resources.cpp
index fdbe554..8489d60 100644
--- a/minui/resources.cpp
+++ b/minui/resources.cpp
@@ -283,7 +283,7 @@
         goto exit;
     }
 
-    surface = reinterpret_cast<GRSurface**>(malloc(*frames * sizeof(GRSurface*)));
+    surface = reinterpret_cast<GRSurface**>(calloc(*frames, sizeof(GRSurface*)));
     if (surface == NULL) {
         result = -8;
         goto exit;
@@ -318,7 +318,7 @@
     if (result < 0) {
         if (surface) {
             for (int i = 0; i < *frames; ++i) {
-                if (surface[i]) free(surface[i]);
+                free(surface[i]);
             }
             free(surface);
         }
@@ -421,7 +421,7 @@
         png_read_row(png_ptr, row.data(), NULL);
         int w = (row[1] << 8) | row[0];
         int h = (row[3] << 8) | row[2];
-        int len = row[4];
+        __unused int len = row[4];
         char* loc = reinterpret_cast<char*>(&row[5]);
 
         if (y+1+h >= height || matches_locale(loc, locale)) {
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
index 09ec876..de47edf 100644
--- a/minzip/SysUtil.c
+++ b/minzip/SysUtil.c
@@ -8,6 +8,7 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -39,6 +40,11 @@
     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 +56,7 @@
     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 +75,80 @@
         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 +171,7 @@
 
         if (sysMapBlockFile(mapf, pMap) != 0) {
             LOGE("Map of '%s' failed\n", fn);
+            fclose(mapf);
             return -1;
         }
 
diff --git a/recovery.cpp b/recovery.cpp
index ee2fb43..593d094 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -40,6 +40,8 @@
 #include <cutils/android_reboot.h>
 #include <cutils/properties.h>
 
+#include <healthd/BatteryMonitor.h>
+
 #include "adb_install.h"
 #include "bootloader.h"
 #include "common.h"
@@ -87,6 +89,12 @@
 static const char *LAST_KMSG_FILE = "/cache/recovery/last_kmsg";
 static const char *LAST_LOG_FILE = "/cache/recovery/last_log";
 static const int KEEP_LOG_COUNT = 10;
+static const int BATTERY_READ_TIMEOUT_IN_SEC = 10;
+// GmsCore enters recovery mode to install package when having enough battery
+// percentage. Normally, the threshold is 40% without charger and 20% with charger.
+// So we should check battery with a slightly lower limitation.
+static const int BATTERY_OK_PERCENTAGE = 20;
+static const int BATTERY_WITH_CHARGER_OK_PERCENTAGE = 15;
 
 RecoveryUI* ui = NULL;
 char* locale = NULL;
@@ -1080,8 +1088,61 @@
     }
 }
 
-int
-main(int argc, char **argv) {
+static bool is_battery_ok() {
+    struct healthd_config healthd_config = {
+            .batteryStatusPath = android::String8(android::String8::kEmptyString),
+            .batteryHealthPath = android::String8(android::String8::kEmptyString),
+            .batteryPresentPath = android::String8(android::String8::kEmptyString),
+            .batteryCapacityPath = android::String8(android::String8::kEmptyString),
+            .batteryVoltagePath = android::String8(android::String8::kEmptyString),
+            .batteryTemperaturePath = android::String8(android::String8::kEmptyString),
+            .batteryTechnologyPath = android::String8(android::String8::kEmptyString),
+            .batteryCurrentNowPath = android::String8(android::String8::kEmptyString),
+            .batteryCurrentAvgPath = android::String8(android::String8::kEmptyString),
+            .batteryChargeCounterPath = android::String8(android::String8::kEmptyString),
+            .batteryFullChargePath = android::String8(android::String8::kEmptyString),
+            .batteryCycleCountPath = android::String8(android::String8::kEmptyString),
+            .energyCounter = NULL,
+            .boot_min_cap = 0,
+            .screen_on = NULL
+    };
+    healthd_board_init(&healthd_config);
+
+    android::BatteryMonitor monitor;
+    monitor.init(&healthd_config);
+
+    int wait_second = 0;
+    while (true) {
+        int charge_status = monitor.getChargeStatus();
+        // Treat unknown status as charged.
+        bool charged = (charge_status != android::BATTERY_STATUS_DISCHARGING &&
+                        charge_status != android::BATTERY_STATUS_NOT_CHARGING);
+        android::BatteryProperty capacity;
+        android::status_t status = monitor.getProperty(android::BATTERY_PROP_CAPACITY, &capacity);
+        ui_print("charge_status %d, charged %d, status %d, capacity %lld\n", charge_status,
+                 charged, status, capacity.valueInt64);
+        // At startup, the battery drivers in devices like N5X/N6P take some time to load
+        // the battery profile. Before the load finishes, it reports value 50 as a fake
+        // capacity. BATTERY_READ_TIMEOUT_IN_SEC is set that the battery drivers are expected
+        // to finish loading the battery profile earlier than 10 seconds after kernel startup.
+        if (status == 0 && capacity.valueInt64 == 50) {
+            if (wait_second < BATTERY_READ_TIMEOUT_IN_SEC) {
+                sleep(1);
+                wait_second++;
+                continue;
+            }
+        }
+        // If we can't read battery percentage, it may be a device without battery. In this
+        // situation, use 100 as a fake battery percentage.
+        if (status != 0) {
+            capacity.valueInt64 = 100;
+        }
+        return (charged && capacity.valueInt64 >= BATTERY_WITH_CHARGER_OK_PERCENTAGE) ||
+                (!charged && capacity.valueInt64 >= BATTERY_OK_PERCENTAGE);
+    }
+}
+
+int main(int argc, char **argv) {
     // If this binary is started with the single argument "--adbd",
     // instead of being the normal recovery binary, it turns into kind
     // of a stripped-down version of adbd that only supports the
@@ -1211,18 +1272,25 @@
     int status = INSTALL_SUCCESS;
 
     if (update_package != NULL) {
-        status = install_package(update_package, &should_wipe_cache, TEMPORARY_INSTALL_FILE, true);
-        if (status == INSTALL_SUCCESS && should_wipe_cache) {
-            wipe_cache(false, device);
-        }
-        if (status != INSTALL_SUCCESS) {
-            ui->Print("Installation aborted.\n");
+        if (!is_battery_ok()) {
+            ui->Print("battery capacity is not enough for installing package, needed is %d%%\n",
+                      BATTERY_OK_PERCENTAGE);
+            status = INSTALL_SKIPPED;
+        } else {
+            status = install_package(update_package, &should_wipe_cache,
+                                     TEMPORARY_INSTALL_FILE, true);
+            if (status == INSTALL_SUCCESS && should_wipe_cache) {
+                wipe_cache(false, device);
+            }
+            if (status != INSTALL_SUCCESS) {
+                ui->Print("Installation aborted.\n");
 
-            // If this is an eng or userdebug build, then automatically
-            // turn the text display on if the script fails so the error
-            // message is visible.
-            if (is_ro_debuggable()) {
-                ui->ShowText(true);
+                // If this is an eng or userdebug build, then automatically
+                // turn the text display on if the script fails so the error
+                // message is visible.
+                if (is_ro_debuggable()) {
+                    ui->ShowText(true);
+                }
             }
         }
     } else if (should_wipe_data) {
@@ -1271,7 +1339,8 @@
     }
 
     Device::BuiltinAction after = shutdown_after ? Device::SHUTDOWN : Device::REBOOT;
-    if ((status != INSTALL_SUCCESS && !sideload_auto_reboot) || ui->IsTextVisible()) {
+    if ((status != INSTALL_SUCCESS && status != INSTALL_SKIPPED && !sideload_auto_reboot) ||
+            ui->IsTextVisible()) {
         Device::BuiltinAction temp = prompt_and_wait(device, status);
         if (temp != Device::NO_ACTION) {
             after = temp;
diff --git a/updater/updater.cpp b/updater/updater.cpp
index efb4a8c..0d58f64 100644
--- a/updater/updater.cpp
+++ b/updater/updater.cpp
@@ -19,6 +19,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <string>
+
 #include "edify/expr.h"
 #include "updater.h"
 #include "install.h"
@@ -91,12 +93,11 @@
         return 4;
     }
 
-    char* script = reinterpret_cast<char*>(malloc(script_entry->uncompLen+1));
-    if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
+    std::string script(script_entry->uncompLen, '\0');
+    if (!mzReadZipEntry(&za, script_entry, &script[0], script_entry->uncompLen)) {
         printf("failed to read script from package\n");
         return 5;
     }
-    script[script_entry->uncompLen] = '\0';
 
     // Configure edify's functions.
 
@@ -110,7 +111,7 @@
 
     Expr* root;
     int error_count = 0;
-    int error = parse_string(script, &root, &error_count);
+    int error = parse_string(script.c_str(), &root, &error_count);
     if (error != 0 || error_count > 0) {
         printf("%d parse errors\n", error_count);
         return 6;
@@ -137,7 +138,7 @@
 
     State state;
     state.cookie = &updater_info;
-    state.script = script;
+    state.script = &script[0];
     state.errmsg = NULL;
 
     char* result = Evaluate(&state, root);
@@ -165,7 +166,5 @@
         mzCloseZipArchive(updater_info.package_zip);
     }
     sysReleaseMap(&map);
-    free(script);
-
     return 0;
 }