diff --git a/Android.mk b/Android.mk
index 3d61568..b1e3798 100644
--- a/Android.mk
+++ b/Android.mk
@@ -57,7 +57,7 @@
 
 ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
     LOCAL_CFLAGS += -DUSE_EXT4
-    LOCAL_C_INCLUDES += system/extras/ext4_utils
+    LOCAL_C_INCLUDES += system/extras/ext4_utils system/vold
     LOCAL_STATIC_LIBRARIES += libext4_utils_static libz
 endif
 
@@ -89,6 +89,7 @@
 LOCAL_MODULE := verifier_test
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 LOCAL_MODULE_TAGS := tests
+LOCAL_CFLAGS += -DNO_RECOVERY_MOUNT
 LOCAL_SRC_FILES := \
     verifier_test.cpp \
     asn1_decoder.cpp \
@@ -97,6 +98,7 @@
 LOCAL_STATIC_LIBRARIES := \
     libmincrypt \
     libminui \
+    libminzip \
     libcutils \
     libstdc++ \
     libc
@@ -111,5 +113,6 @@
     $(LOCAL_PATH)/tests/Android.mk \
     $(LOCAL_PATH)/tools/Android.mk \
     $(LOCAL_PATH)/edify/Android.mk \
+    $(LOCAL_PATH)/uncrypt/Android.mk \
     $(LOCAL_PATH)/updater/Android.mk \
     $(LOCAL_PATH)/applypatch/Android.mk
diff --git a/etc/init.rc b/etc/init.rc
index 159747e..f16bef8 100644
--- a/etc/init.rc
+++ b/etc/init.rc
@@ -52,7 +52,7 @@
     critical
     seclabel u:r:ueventd:s0
 
-service healthd /sbin/healthd -n
+service healthd /sbin/healthd -r
     critical
     seclabel u:r:healthd:s0
 
diff --git a/install.cpp b/install.cpp
index 797a525..0bd7945 100644
--- a/install.cpp
+++ b/install.cpp
@@ -120,6 +120,7 @@
 
     pid_t pid = fork();
     if (pid == 0) {
+        umask(022);
         close(pipefd[0]);
         execv(binary, (char* const*)args);
         fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno));
@@ -185,12 +186,22 @@
     ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
     LOGI("Update location: %s\n", path);
 
-    if (ensure_path_mounted(path) != 0) {
-        LOGE("Can't mount %s\n", path);
-        return INSTALL_CORRUPT;
+    // Map the update package into memory.
+    ui->Print("Opening update package...\n");
+
+    if (path) {
+        if (path[0] == '@') {
+            ensure_path_mounted(path+1);
+        } else {
+            ensure_path_mounted(path);
+        }
     }
 
-    ui->Print("Opening update package...\n");
+    MemMapping map;
+    if (sysMapFile(path, &map) != 0) {
+        LOGE("failed to map file\n");
+        return INSTALL_CORRUPT;
+    }
 
     int numKeys;
     Certificate* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
@@ -203,27 +214,33 @@
     ui->Print("Verifying update package...\n");
 
     int err;
-    err = verify_file(path, loadedKeys, numKeys);
+    err = verify_file(map.addr, map.length, loadedKeys, numKeys);
     free(loadedKeys);
     LOGI("verify_file returned %d\n", err);
     if (err != VERIFY_SUCCESS) {
         LOGE("signature verification failed\n");
+        sysReleaseMap(&map);
         return INSTALL_CORRUPT;
     }
 
     /* Try to open the package.
      */
     ZipArchive zip;
-    err = mzOpenZipArchive(path, &zip);
+    err = mzOpenZipArchive(map.addr, map.length, &zip);
     if (err != 0) {
         LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
+        sysReleaseMap(&map);
         return INSTALL_CORRUPT;
     }
 
     /* Verify and install the contents of the package.
      */
     ui->Print("Installing update...\n");
-    return try_update_binary(path, &zip, wipe_cache);
+    int result = try_update_binary(path, &zip, wipe_cache);
+
+    sysReleaseMap(&map);
+
+    return result;
 }
 
 int
diff --git a/minui/events.c b/minui/events.c
index 2918afa..df7dad4 100644
--- a/minui/events.c
+++ b/minui/events.c
@@ -18,7 +18,7 @@
 #include <stdlib.h>
 #include <fcntl.h>
 #include <dirent.h>
-#include <sys/poll.h>
+#include <sys/epoll.h>
 
 #include <linux/input.h>
 
@@ -34,11 +34,15 @@
     ((array)[(bit)/BITS_PER_LONG] & (1 << ((bit) % BITS_PER_LONG)))
 
 struct fd_info {
+    int fd;
     ev_callback cb;
     void *data;
 };
 
-static struct pollfd ev_fds[MAX_DEVICES + MAX_MISC_FDS];
+static int epollfd;
+static struct epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
+static int npolledevents;
+
 static struct fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
 
 static unsigned ev_count = 0;
@@ -50,6 +54,12 @@
     DIR *dir;
     struct dirent *de;
     int fd;
+    struct epoll_event ev;
+    bool epollctlfail = false;
+
+    epollfd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
+    if (epollfd == -1)
+        return -1;
 
     dir = opendir("/dev/input");
     if(dir != 0) {
@@ -74,8 +84,15 @@
                 continue;
             }
 
-            ev_fds[ev_count].fd = fd;
-            ev_fds[ev_count].events = POLLIN;
+            ev.events = EPOLLIN | EPOLLWAKEUP;
+            ev.data.ptr = (void *)&ev_fdinfo[ev_count];
+            if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev)) {
+                close(fd);
+                epollctlfail = true;
+                continue;
+            }
+
+            ev_fdinfo[ev_count].fd = fd;
             ev_fdinfo[ev_count].cb = input_cb;
             ev_fdinfo[ev_count].data = data;
             ev_count++;
@@ -84,59 +101,78 @@
         }
     }
 
+    if (epollctlfail && !ev_count) {
+        close(epollfd);
+        epollfd = -1;
+        return -1;
+    }
+
     return 0;
 }
 
 int ev_add_fd(int fd, ev_callback cb, void *data)
 {
+    struct epoll_event ev;
+    int ret;
+
     if (ev_misc_count == MAX_MISC_FDS || cb == NULL)
         return -1;
 
-    ev_fds[ev_count].fd = fd;
-    ev_fds[ev_count].events = POLLIN;
-    ev_fdinfo[ev_count].cb = cb;
-    ev_fdinfo[ev_count].data = data;
-    ev_count++;
-    ev_misc_count++;
-    return 0;
+    ev.events = EPOLLIN | EPOLLWAKEUP;
+    ev.data.ptr = (void *)&ev_fdinfo[ev_count];
+    ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev);
+    if (!ret) {
+        ev_fdinfo[ev_count].fd = fd;
+        ev_fdinfo[ev_count].cb = cb;
+        ev_fdinfo[ev_count].data = data;
+        ev_count++;
+        ev_misc_count++;
+    }
+
+    return ret;
+}
+
+int ev_get_epollfd(void)
+{
+    return epollfd;
 }
 
 void ev_exit(void)
 {
     while (ev_count > 0) {
-        close(ev_fds[--ev_count].fd);
+        close(ev_fdinfo[--ev_count].fd);
     }
     ev_misc_count = 0;
     ev_dev_count = 0;
+    close(epollfd);
 }
 
 int ev_wait(int timeout)
 {
-    int r;
-
-    r = poll(ev_fds, ev_count, timeout);
-    if (r <= 0)
+    npolledevents = epoll_wait(epollfd, polledevents, ev_count, timeout);
+    if (npolledevents <= 0)
         return -1;
     return 0;
 }
 
 void ev_dispatch(void)
 {
-    unsigned n;
+    int n;
     int ret;
 
-    for (n = 0; n < ev_count; n++) {
-        ev_callback cb = ev_fdinfo[n].cb;
-        if (cb && (ev_fds[n].revents & ev_fds[n].events))
-            cb(ev_fds[n].fd, ev_fds[n].revents, ev_fdinfo[n].data);
+    for (n = 0; n < npolledevents; n++) {
+        struct fd_info *fdi = polledevents[n].data.ptr;
+        ev_callback cb = fdi->cb;
+        if (cb)
+            cb(fdi->fd, polledevents[n].events, fdi->data);
     }
 }
 
-int ev_get_input(int fd, short revents, struct input_event *ev)
+int ev_get_input(int fd, uint32_t epevents, struct input_event *ev)
 {
     int r;
 
-    if (revents & POLLIN) {
+    if (epevents & EPOLLIN) {
         r = read(fd, ev, sizeof(*ev));
         if (r == sizeof(*ev))
             return 0;
@@ -157,11 +193,11 @@
         memset(key_bits, 0, sizeof(key_bits));
         memset(ev_bits, 0, sizeof(ev_bits));
 
-        ret = ioctl(ev_fds[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
+        ret = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
         if (ret < 0 || !test_bit(EV_KEY, ev_bits))
             continue;
 
-        ret = ioctl(ev_fds[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits);
+        ret = ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits);
         if (ret < 0)
             continue;
 
diff --git a/minui/minui.h b/minui/minui.h
index 1b8dd05..573dd71 100644
--- a/minui/minui.h
+++ b/minui/minui.h
@@ -50,7 +50,7 @@
 // see http://www.mjmwired.net/kernel/Documentation/input/ for info.
 struct input_event;
 
-typedef int (*ev_callback)(int fd, short revents, void *data);
+typedef int (*ev_callback)(int fd, uint32_t epevents, void *data);
 typedef int (*ev_set_key_callback)(int code, int value, void *data);
 
 int ev_init(ev_callback input_cb, void *data);
@@ -65,8 +65,9 @@
  */
 int ev_wait(int timeout);
 
-int ev_get_input(int fd, short revents, struct input_event *ev);
+int ev_get_input(int fd, uint32_t epevents, struct input_event *ev);
 void ev_dispatch(void);
+int ev_get_epollfd(void);
 
 // Resources
 
diff --git a/minui/resources.c b/minui/resources.c
index c0a9cca..b20c00a 100644
--- a/minui/resources.c
+++ b/minui/resources.c
@@ -123,10 +123,18 @@
     surface->height = height;
     surface->stride = width; /* Yes, pixels, not bytes */
     surface->data = pData;
-    surface->format = (channels == 3) ? GGL_PIXEL_FORMAT_RGBX_8888 :
-        ((color_type == PNG_COLOR_TYPE_PALETTE ? GGL_PIXEL_FORMAT_RGBA_8888 : GGL_PIXEL_FORMAT_L_8));
 
-    int alpha = 0;
+    if (channels == 3) {
+        surface->format = GGL_PIXEL_FORMAT_RGBX_8888;
+    } else if (color_type == PNG_COLOR_TYPE_PALETTE) {
+        surface->format = GGL_PIXEL_FORMAT_RGBA_8888;
+    } else if (channels == 1) {
+        surface->format = GGL_PIXEL_FORMAT_L_8;
+    } else {
+        surface->format = GGL_PIXEL_FORMAT_RGBA_8888;
+    }
+
+    int alpha = (channels == 4);
     if (color_type == PNG_COLOR_TYPE_PALETTE) {
         png_set_palette_to_rgb(png_ptr);
     }
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
index 31c76d6..c046a8c 100644
--- a/minzip/SysUtil.c
+++ b/minzip/SysUtil.c
@@ -8,42 +8,17 @@
 #include <unistd.h>
 #include <string.h>
 #include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <limits.h>
 #include <errno.h>
 #include <assert.h>
 
-#define LOG_TAG "minzip"
+#define LOG_TAG "sysutil"
 #include "Log.h"
 #include "SysUtil.h"
 
-/*
- * Having trouble finding a portable way to get this.  sysconf(_SC_PAGE_SIZE)
- * seems appropriate, but we don't have that on the device.  Some systems
- * have getpagesize(2), though the linux man page has some odd cautions.
- */
-#define DEFAULT_PAGE_SIZE   4096
-
-
-/*
- * Create an anonymous shared memory segment large enough to hold "length"
- * bytes.  The actual segment may be larger because mmap() operates on
- * page boundaries (usually 4K).
- */
-static void* sysCreateAnonShmem(size_t length)
-{
-    void* ptr;
-
-    ptr = mmap(NULL, length, PROT_READ | PROT_WRITE,
-            MAP_SHARED | MAP_ANON, -1, 0);
-    if (ptr == MAP_FAILED) {
-        LOGW("mmap(%d, RW, SHARED|ANON) failed: %s\n", (int) length,
-            strerror(errno));
-        return NULL;
-    }
-
-    return ptr;
-}
-
 static int getFileStartAndLength(int fd, off_t *start_, size_t *length_)
 {
     off_t start, end;
@@ -74,48 +49,13 @@
 }
 
 /*
- * Pull the contents of a file into an new shared memory segment.  We grab
- * everything from fd's current offset on.
- *
- * We need to know the length ahead of time so we can allocate a segment
- * of sufficient size.
- */
-int sysLoadFileInShmem(int fd, MemMapping* pMap)
-{
-    off_t start;
-    size_t length, actual;
-    void* memPtr;
-
-    assert(pMap != NULL);
-
-    if (getFileStartAndLength(fd, &start, &length) < 0)
-        return -1;
-
-    memPtr = sysCreateAnonShmem(length);
-    if (memPtr == NULL)
-        return -1;
-
-    pMap->baseAddr = pMap->addr = memPtr;
-    pMap->baseLength = pMap->length = length;
-
-    actual = TEMP_FAILURE_RETRY(read(fd, memPtr, length));
-    if (actual != length) {
-        LOGE("only read %d of %d bytes\n", (int) actual, (int) length);
-        sysReleaseShmem(pMap);
-        return -1;
-    }
-
-    return 0;
-}
-
-/*
- * Map a file (from fd's current offset) into a shared, read-only memory
+ * Map a file (from fd's current offset) into a private, read-only memory
  * segment.  The file offset must be a multiple of the page size.
  *
  * On success, returns 0 and fills out "pMap".  On failure, returns a nonzero
  * value and does not disturb "pMap".
  */
-int sysMapFileInShmem(int fd, MemMapping* pMap)
+static int sysMapFD(int fd, MemMapping* pMap)
 {
     off_t start;
     size_t length;
@@ -126,87 +66,148 @@
     if (getFileStartAndLength(fd, &start, &length) < 0)
         return -1;
 
-    memPtr = mmap(NULL, length, PROT_READ, MAP_FILE | MAP_SHARED, fd, start);
+    memPtr = mmap(NULL, length, PROT_READ, MAP_PRIVATE, fd, start);
     if (memPtr == MAP_FAILED) {
-        LOGW("mmap(%d, R, FILE|SHARED, %d, %d) failed: %s\n", (int) length,
+        LOGW("mmap(%d, R, PRIVATE, %d, %d) failed: %s\n", (int) length,
             fd, (int) start, strerror(errno));
         return -1;
     }
 
-    pMap->baseAddr = pMap->addr = memPtr;
-    pMap->baseLength = pMap->length = length;
+    pMap->addr = memPtr;
+    pMap->length = length;
+    pMap->range_count = 1;
+    pMap->ranges = malloc(sizeof(MappedRange));
+    pMap->ranges[0].addr = memPtr;
+    pMap->ranges[0].length = length;
 
     return 0;
 }
 
-/*
- * Map part of a file (from fd's current offset) into a shared, read-only
- * memory segment.
- *
- * On success, returns 0 and fills out "pMap".  On failure, returns a nonzero
- * value and does not disturb "pMap".
- */
-int sysMapFileSegmentInShmem(int fd, off_t start, long length,
-    MemMapping* pMap)
+static int sysMapBlockFile(FILE* mapf, MemMapping* pMap)
 {
-    off_t dummy;
-    size_t fileLength, actualLength;
-    off_t actualStart;
-    int adjust;
-    void* memPtr;
+    char block_dev[PATH_MAX+1];
+    size_t size;
+    unsigned int blksize;
+    unsigned int blocks;
+    unsigned int range_count;
+    unsigned int i;
 
-    assert(pMap != NULL);
-
-    if (getFileStartAndLength(fd, &dummy, &fileLength) < 0)
+    if (fgets(block_dev, sizeof(block_dev), mapf) == NULL) {
+        LOGW("failed to read block device from header\n");
         return -1;
+    }
+    for (i = 0; i < sizeof(block_dev); ++i) {
+        if (block_dev[i] == '\n') {
+            block_dev[i] = 0;
+            break;
+        }
+    }
 
-    if (start + length > (long)fileLength) {
-        LOGW("bad segment: st=%d len=%ld flen=%d\n",
-            (int) start, length, (int) fileLength);
+    if (fscanf(mapf, "%d %d\n%d\n", &size, &blksize, &range_count) != 3) {
+        LOGW("failed to parse block map header\n");
         return -1;
     }
 
-    /* adjust to be page-aligned */
-    adjust = start % DEFAULT_PAGE_SIZE;
-    actualStart = start - adjust;
-    actualLength = length + adjust;
+    blocks = ((size-1) / blksize) + 1;
 
-    memPtr = mmap(NULL, actualLength, PROT_READ, MAP_FILE | MAP_SHARED,
-                fd, actualStart);
-    if (memPtr == MAP_FAILED) {
-        LOGW("mmap(%d, R, FILE|SHARED, %d, %d) failed: %s\n",
-            (int) actualLength, fd, (int) actualStart, strerror(errno));
+    pMap->range_count = range_count;
+    pMap->ranges = malloc(range_count * sizeof(MappedRange));
+    memset(pMap->ranges, 0, range_count * sizeof(MappedRange));
+
+    // 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) {
+        LOGW("failed to reserve address space: %s\n", strerror(errno));
         return -1;
     }
 
-    pMap->baseAddr = memPtr;
-    pMap->baseLength = actualLength;
-    pMap->addr = (char*)memPtr + adjust;
-    pMap->length = length;
+    pMap->ranges[range_count-1].addr = reserve;
+    pMap->ranges[range_count-1].length = blocks * blksize;
 
-    LOGVV("mmap seg (st=%d ln=%d): bp=%p bl=%d ad=%p ln=%d\n",
-        (int) start, (int) length,
-        pMap->baseAddr, (int) pMap->baseLength,
-        pMap->addr, (int) pMap->length);
+    int fd = open(block_dev, O_RDONLY);
+    if (fd < 0) {
+        LOGW("failed to open block device %s: %s\n", block_dev, strerror(errno));
+        return -1;
+    }
 
+    unsigned char* next = reserve;
+    for (i = 0; i < range_count; ++i) {
+        int start, end;
+        if (fscanf(mapf, "%d %d\n", &start, &end) != 2) {
+            LOGW("failed to parse range %d in block map\n", i);
+            return -1;
+        }
+
+        void* addr = mmap64(next, (end-start)*blksize, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
+        if (addr == MAP_FAILED) {
+            LOGW("failed to map block %d: %s\n", i, strerror(errno));
+            return -1;
+        }
+        pMap->ranges[i].addr = addr;
+        pMap->ranges[i].length = (end-start)*blksize;
+
+        next += pMap->ranges[i].length;
+    }
+
+    pMap->addr = reserve;
+    pMap->length = size;
+
+    LOGI("mmapped %d ranges\n", range_count);
+
+    return 0;
+}
+
+int sysMapFile(const char* fn, MemMapping* pMap)
+{
+    memset(pMap, 0, sizeof(*pMap));
+
+    if (fn && fn[0] == '@') {
+        // A map of blocks
+        FILE* mapf = fopen(fn+1, "r");
+        if (mapf == NULL) {
+            LOGV("Unable to open '%s': %s\n", fn+1, strerror(errno));
+            return -1;
+        }
+
+        if (sysMapBlockFile(mapf, pMap) != 0) {
+            LOGW("Map of '%s' failed\n", fn);
+            return -1;
+        }
+
+        fclose(mapf);
+    } else {
+        // This is a regular file.
+        int fd = open(fn, O_RDONLY, 0);
+        if (fd < 0) {
+            LOGE("Unable to open '%s': %s\n", fn, strerror(errno));
+            return -1;
+        }
+
+        if (sysMapFD(fd, pMap) != 0) {
+            LOGE("Map of '%s' failed\n", fn);
+            close(fd);
+            return -1;
+        }
+
+        close(fd);
+    }
     return 0;
 }
 
 /*
  * Release a memory mapping.
  */
-void sysReleaseShmem(MemMapping* pMap)
+void sysReleaseMap(MemMapping* pMap)
 {
-    if (pMap->baseAddr == NULL && pMap->baseLength == 0)
-        return;
-
-    if (munmap(pMap->baseAddr, pMap->baseLength) < 0) {
-        LOGW("munmap(%p, %d) failed: %s\n",
-            pMap->baseAddr, (int)pMap->baseLength, strerror(errno));
-    } else {
-        LOGV("munmap(%p, %d) succeeded\n", pMap->baseAddr, pMap->baseLength);
-        pMap->baseAddr = NULL;
-        pMap->baseLength = 0;
+    int i;
+    for (i = 0; i < pMap->range_count; ++i) {
+        if (munmap(pMap->ranges[i].addr, pMap->ranges[i].length) < 0) {
+            LOGW("munmap(%p, %d) failed: %s\n",
+                 pMap->ranges[i].addr, (int)pMap->ranges[i].length, strerror(errno));
+        }
     }
+    free(pMap->ranges);
+    pMap->ranges = NULL;
+    pMap->range_count = 0;
 }
-
diff --git a/minzip/SysUtil.h b/minzip/SysUtil.h
index ec3a4bc..7adff1e 100644
--- a/minzip/SysUtil.h
+++ b/minzip/SysUtil.h
@@ -6,56 +6,47 @@
 #ifndef _MINZIP_SYSUTIL
 #define _MINZIP_SYSUTIL
 
-#include "inline_magic.h"
-
+#include <stdio.h>
 #include <sys/types.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct MappedRange {
+    void* addr;
+    size_t length;
+} MappedRange;
+
 /*
  * Use this to keep track of mapped segments.
  */
 typedef struct MemMapping {
-    void*   addr;           /* start of data */
-    size_t  length;         /* length of data */
+    unsigned char* addr;           /* start of data */
+    size_t         length;         /* length of data */
 
-    void*   baseAddr;       /* page-aligned base address */
-    size_t  baseLength;     /* length of mapping */
+    int            range_count;
+    MappedRange*   ranges;
 } MemMapping;
 
-/* copy a map */
-INLINE void sysCopyMap(MemMapping* dst, const MemMapping* src) {
-    *dst = *src;
-}
-
 /*
- * Load a file into a new shared memory segment.  All data from the current
- * offset to the end of the file is pulled in.
- *
- * The segment is read-write, allowing VM fixups.  (It should be modified
- * to support .gz/.zip compressed data.)
+ * Map a file into a private, read-only memory segment.  If 'fn'
+ * begins with an '@' character, it is a map of blocks to be mapped,
+ * otherwise it is treated as an ordinary file.
  *
  * On success, "pMap" is filled in, and zero is returned.
  */
-int sysLoadFileInShmem(int fd, MemMapping* pMap);
-
-/*
- * Map a file (from fd's current offset) into a shared,
- * read-only memory segment.
- *
- * On success, "pMap" is filled in, and zero is returned.
- */
-int sysMapFileInShmem(int fd, MemMapping* pMap);
-
-/*
- * Like sysMapFileInShmem, but on only part of a file.
- */
-int sysMapFileSegmentInShmem(int fd, off_t start, long length,
-    MemMapping* pMap);
+int sysMapFile(const char* fn, MemMapping* pMap);
 
 /*
  * Release the pages associated with a shared memory segment.
  *
  * This does not free "pMap"; it just releases the memory.
  */
-void sysReleaseShmem(MemMapping* pMap);
+void sysReleaseMap(MemMapping* pMap);
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif /*_MINZIP_SYSUTIL*/
diff --git a/minzip/Zip.c b/minzip/Zip.c
index 439e5d9..6752bce 100644
--- a/minzip/Zip.c
+++ b/minzip/Zip.c
@@ -184,7 +184,7 @@
  *
  * Returns "true" on success.
  */
-static bool parseZipArchive(ZipArchive* pArchive, const MemMapping* pMap)
+static bool parseZipArchive(ZipArchive* pArchive)
 {
     bool result = false;
     const unsigned char* ptr;
@@ -196,7 +196,7 @@
      * signature for the first file (LOCSIG) or, if the archive doesn't
      * have any files in it, the end-of-central-directory signature (ENDSIG).
      */
-    val = get4LE(pMap->addr);
+    val = get4LE(pArchive->addr);
     if (val == ENDSIG) {
         LOGI("Found Zip archive, but it looks empty\n");
         goto bail;
@@ -209,14 +209,14 @@
      * Find the EOCD.  We'll find it immediately unless they have a file
      * comment.
      */
-    ptr = pMap->addr + pMap->length - ENDHDR;
+    ptr = pArchive->addr + pArchive->length - ENDHDR;
 
-    while (ptr >= (const unsigned char*) pMap->addr) {
+    while (ptr >= (const unsigned char*) pArchive->addr) {
         if (*ptr == (ENDSIG & 0xff) && get4LE(ptr) == ENDSIG)
             break;
         ptr--;
     }
-    if (ptr < (const unsigned char*) pMap->addr) {
+    if (ptr < (const unsigned char*) pArchive->addr) {
         LOGI("Could not find end-of-central-directory in Zip\n");
         goto bail;
     }
@@ -230,9 +230,9 @@
     cdOffset = get4LE(ptr + ENDOFF);
 
     LOGVV("numEntries=%d cdOffset=%d\n", numEntries, cdOffset);
-    if (numEntries == 0 || cdOffset >= pMap->length) {
+    if (numEntries == 0 || cdOffset >= pArchive->length) {
         LOGW("Invalid entries=%d offset=%d (len=%zd)\n",
-            numEntries, cdOffset, pMap->length);
+            numEntries, cdOffset, pArchive->length);
         goto bail;
     }
 
@@ -245,14 +245,14 @@
     if (pArchive->pEntries == NULL || pArchive->pHash == NULL)
         goto bail;
 
-    ptr = pMap->addr + cdOffset;
+    ptr = pArchive->addr + cdOffset;
     for (i = 0; i < numEntries; i++) {
         ZipEntry* pEntry;
         unsigned int fileNameLen, extraLen, commentLen, localHdrOffset;
         const unsigned char* localHdr;
         const char *fileName;
 
-        if (ptr + CENHDR > (const unsigned char*)pMap->addr + pMap->length) {
+        if (ptr + CENHDR > (const unsigned char*)pArchive->addr + pArchive->length) {
             LOGW("Ran off the end (at %d)\n", i);
             goto bail;
         }
@@ -266,7 +266,7 @@
         extraLen = get2LE(ptr + CENEXT);
         commentLen = get2LE(ptr + CENCOM);
         fileName = (const char*)ptr + CENHDR;
-        if (fileName + fileNameLen > (const char*)pMap->addr + pMap->length) {
+        if (fileName + fileNameLen > (const char*)pArchive->addr + pArchive->length) {
             LOGW("Filename ran off the end (at %d)\n", i);
             goto bail;
         }
@@ -352,15 +352,15 @@
         }
         pEntry->externalFileAttributes = get4LE(ptr + CENATX);
 
-        // Perform pMap->addr + localHdrOffset, ensuring that it won't
+        // Perform pArchive->addr + localHdrOffset, ensuring that it won't
         // overflow. This is needed because localHdrOffset is untrusted.
-        if (!safe_add((uintptr_t *)&localHdr, (uintptr_t)pMap->addr,
+        if (!safe_add((uintptr_t *)&localHdr, (uintptr_t)pArchive->addr,
             (uintptr_t)localHdrOffset)) {
             LOGW("Integer overflow adding in parseZipArchive\n");
             goto bail;
         }
         if ((uintptr_t)localHdr + LOCHDR >
-            (uintptr_t)pMap->addr + pMap->length) {
+            (uintptr_t)pArchive->addr + pArchive->length) {
             LOGW("Bad offset to local header: %d (at %d)\n", localHdrOffset, i);
             goto bail;
         }
@@ -374,7 +374,7 @@
             LOGW("Integer overflow adding in parseZipArchive\n");
             goto bail;
         }
-        if ((size_t)pEntry->offset + pEntry->compLen > pMap->length) {
+        if ((size_t)pEntry->offset + pEntry->compLen > pArchive->length) {
             LOGW("Data ran off the end (at %d)\n", i);
             goto bail;
         }
@@ -427,50 +427,30 @@
  *
  * On success, we fill out the contents of "pArchive".
  */
-int mzOpenZipArchive(const char* fileName, ZipArchive* pArchive)
+int mzOpenZipArchive(unsigned char* addr, size_t length, ZipArchive* pArchive)
 {
-    MemMapping map;
     int err;
 
-    LOGV("Opening archive '%s' %p\n", fileName, pArchive);
-
-    map.addr = NULL;
-    memset(pArchive, 0, sizeof(*pArchive));
-
-    pArchive->fd = open(fileName, O_RDONLY, 0);
-    if (pArchive->fd < 0) {
-        err = errno ? errno : -1;
-        LOGV("Unable to open '%s': %s\n", fileName, strerror(err));
-        goto bail;
-    }
-
-    if (sysMapFileInShmem(pArchive->fd, &map) != 0) {
-        err = -1;
-        LOGW("Map of '%s' failed\n", fileName);
-        goto bail;
-    }
-
-    if (map.length < ENDHDR) {
+    if (length < ENDHDR) {
         err = -1;
         LOGV("File '%s' too small to be zip (%zd)\n", fileName, map.length);
         goto bail;
     }
 
-    if (!parseZipArchive(pArchive, &map)) {
+    pArchive->addr = addr;
+    pArchive->length = length;
+
+    if (!parseZipArchive(pArchive)) {
         err = -1;
         LOGV("Parsing '%s' failed\n", fileName);
         goto bail;
     }
 
     err = 0;
-    sysCopyMap(&pArchive->map, &map);
-    map.addr = NULL;
 
 bail:
     if (err != 0)
         mzCloseZipArchive(pArchive);
-    if (map.addr != NULL)
-        sysReleaseShmem(&map);
     return err;
 }
 
@@ -483,16 +463,10 @@
 {
     LOGV("Closing archive %p\n", pArchive);
 
-    if (pArchive->fd >= 0)
-        close(pArchive->fd);
-    if (pArchive->map.addr != NULL)
-        sysReleaseShmem(&pArchive->map);
-
     free(pArchive->pEntries);
 
     mzHashTableFree(pArchive->pHash);
 
-    pArchive->fd = -1;
     pArchive->pHash = NULL;
     pArchive->pEntries = NULL;
 }
@@ -528,29 +502,7 @@
     const ZipEntry *pEntry, ProcessZipEntryContentsFunction processFunction,
     void *cookie)
 {
-    size_t bytesLeft = pEntry->compLen;
-    while (bytesLeft > 0) {
-        unsigned char buf[32 * 1024];
-        ssize_t n;
-        size_t count;
-        bool ret;
-
-        count = bytesLeft;
-        if (count > sizeof(buf)) {
-            count = sizeof(buf);
-        }
-        n = read(pArchive->fd, buf, count);
-        if (n < 0 || (size_t)n != count) {
-            LOGE("Can't read %zu bytes from zip file: %ld\n", count, n);
-            return false;
-        }
-        ret = processFunction(buf, n, cookie);
-        if (!ret) {
-            return false;
-        }
-        bytesLeft -= count;
-    }
-    return true;
+    return processFunction(pArchive->addr + pEntry->offset, pEntry->uncompLen, cookie);
 }
 
 static bool processDeflatedEntry(const ZipArchive *pArchive,
@@ -573,8 +525,8 @@
     zstream.zalloc = Z_NULL;
     zstream.zfree = Z_NULL;
     zstream.opaque = Z_NULL;
-    zstream.next_in = NULL;
-    zstream.avail_in = 0;
+    zstream.next_in = pArchive->addr + pEntry->offset;
+    zstream.avail_in = pEntry->compLen;
     zstream.next_out = (Bytef*) procBuf;
     zstream.avail_out = sizeof(procBuf);
     zstream.data_type = Z_UNKNOWN;
@@ -598,25 +550,6 @@
      * Loop while we have data.
      */
     do {
-        /* read as much as we can */
-        if (zstream.avail_in == 0) {
-            long getSize = (compRemaining > (long)sizeof(readBuf)) ?
-                        (long)sizeof(readBuf) : compRemaining;
-            LOGVV("+++ reading %ld bytes (%ld left)\n",
-                getSize, compRemaining);
-
-            int cc = read(pArchive->fd, readBuf, getSize);
-            if (cc != (int) getSize) {
-                LOGW("inflate read failed (%d vs %ld)\n", cc, getSize);
-                goto z_bail;
-            }
-
-            compRemaining -= getSize;
-
-            zstream.next_in = readBuf;
-            zstream.avail_in = getSize;
-        }
-
         /* uncompress the data */
         zerr = inflate(&zstream, Z_NO_FLUSH);
         if (zerr != Z_OK && zerr != Z_STREAM_END) {
@@ -676,12 +609,6 @@
     bool ret = false;
     off_t oldOff;
 
-    /* save current offset */
-    oldOff = lseek(pArchive->fd, 0, SEEK_CUR);
-
-    /* Seek to the beginning of the entry's compressed data. */
-    lseek(pArchive->fd, pEntry->offset, SEEK_SET);
-
     switch (pEntry->compression) {
     case STORED:
         ret = processStoredEntry(pArchive, pEntry, processFunction, cookie);
@@ -695,8 +622,6 @@
         break;
     }
 
-    /* restore file offset */
-    lseek(pArchive->fd, oldOff, SEEK_SET);
     return ret;
 }
 
diff --git a/minzip/Zip.h b/minzip/Zip.h
index c942828..05a2e60 100644
--- a/minzip/Zip.h
+++ b/minzip/Zip.h
@@ -46,11 +46,11 @@
  * One Zip archive.  Treat as opaque.
  */
 typedef struct ZipArchive {
-    int         fd;
-    unsigned int numEntries;
-    ZipEntry*   pEntries;
-    HashTable*  pHash;          // maps file name to ZipEntry
-    MemMapping  map;
+    unsigned int   numEntries;
+    ZipEntry*      pEntries;
+    HashTable*     pHash;          // maps file name to ZipEntry
+    unsigned char* addr;
+    size_t         length;
 } ZipArchive;
 
 /*
@@ -68,7 +68,7 @@
  * On success, returns 0 and populates "pArchive".  Returns nonzero errno
  * value on failure.
  */
-int mzOpenZipArchive(const char* fileName, ZipArchive* pArchive);
+int mzOpenZipArchive(unsigned char* addr, size_t length, ZipArchive* pArchive);
 
 /*
  * Close archive, releasing resources associated with it.
diff --git a/recovery.cpp b/recovery.cpp
index 43cd9da..0a8c3b5 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -938,7 +938,7 @@
         return 0;
     }
 
-    printf("Starting recovery on %s", ctime(&start));
+    printf("Starting recovery (pid %d) on %s", getpid(), ctime(&start));
 
     load_volume_table();
     ensure_path_mounted(LAST_LOG_FILE);
diff --git a/roots.cpp b/roots.cpp
index 113dba1..28004a7 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -21,6 +21,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 #include <ctype.h>
+#include <fcntl.h>
 
 #include <fs_mgr.h>
 #include "mtdutils/mtdutils.h"
@@ -28,6 +29,10 @@
 #include "roots.h"
 #include "common.h"
 #include "make_ext4fs.h"
+extern "C" {
+#include "wipe.h"
+#include "cryptfs.h"
+}
 
 static struct fstab *fstab = NULL;
 
@@ -191,11 +196,31 @@
     }
 
     if (strcmp(v->fs_type, "ext4") == 0) {
-        int result = make_ext4fs(v->blk_device, v->length, volume, sehandle);
+        ssize_t length = 0;
+        if (v->length != 0) {
+            length = v->length;
+        } else if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0) {
+            length = -CRYPT_FOOTER_OFFSET;
+        }
+        int result = make_ext4fs(v->blk_device, length, volume, sehandle);
         if (result != 0) {
             LOGE("format_volume: make_extf4fs failed on %s\n", v->blk_device);
             return -1;
         }
+
+        // if there's a key_loc that looks like a path, it should be a
+        // block device for storing encryption metadata.  wipe it too.
+        if (v->key_loc != NULL && v->key_loc[0] == '/') {
+            LOGI("wiping %s\n", v->key_loc);
+            int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644);
+            if (fd < 0) {
+                LOGE("format_volume: failed to open %s\n", v->key_loc);
+                return -1;
+            }
+            wipe_block_device(fd, get_file_size(fd));
+            close(fd);
+        }
+
         return 0;
     }
 
@@ -213,10 +238,16 @@
 
         if (strcmp(v->mount_point, "/tmp") == 0 ||
             strcmp(v->mount_point, "/cache") == 0) {
-            if (ensure_path_mounted(v->mount_point) != 0) return -1;
+            if (ensure_path_mounted(v->mount_point) != 0) {
+                LOGE("failed to mount %s\n", v->mount_point);
+                return -1;
+            }
 
         } else {
-            if (ensure_path_unmounted(v->mount_point) != 0) return -1;
+            if (ensure_path_unmounted(v->mount_point) != 0) {
+                LOGE("failed to unmount %s\n", v->mount_point);
+                return -1;
+            }
         }
     }
     return 0;
diff --git a/screen_ui.cpp b/screen_ui.cpp
index 27d0a24..fd1a6c7 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -392,6 +392,7 @@
     text_cols = gr_fb_width() / char_width;
     if (text_cols > kMaxCols - 1) text_cols = kMaxCols - 1;
 
+    backgroundIcon[NONE] = NULL;
     LoadBitmap("icon_installing", &backgroundIcon[INSTALLING_UPDATE]);
     backgroundIcon[ERASING] = backgroundIcon[INSTALLING_UPDATE];
     LoadBitmap("icon_error", &backgroundIcon[ERROR]);
diff --git a/ui.cpp b/ui.cpp
index cece02d..67a2500 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -31,6 +31,7 @@
 #include <cutils/android_reboot.h>
 
 #include "common.h"
+#include "roots.h"
 #include "device.h"
 #include "minui/minui.h"
 #include "screen_ui.h"
@@ -47,7 +48,10 @@
     key_queue_len(0),
     key_last_down(-1),
     key_long_press(false),
-    key_down_count(0) {
+    key_down_count(0),
+    consecutive_power_keys(0),
+    consecutive_alternate_keys(0),
+    last_key(-1) {
     pthread_mutex_init(&key_queue_mutex, NULL);
     pthread_cond_init(&key_queue_cond, NULL);
     self = this;
@@ -59,12 +63,12 @@
 }
 
 
-int RecoveryUI::input_callback(int fd, short revents, void* data)
+int RecoveryUI::input_callback(int fd, uint32_t epevents, void* data)
 {
     struct input_event ev;
     int ret;
 
-    ret = ev_get_input(fd, revents, &ev);
+    ret = ev_get_input(fd, epevents, &ev);
     if (ret)
         return -1;
 
@@ -152,6 +156,13 @@
           case RecoveryUI::ENQUEUE:
             EnqueueKey(key_code);
             break;
+
+          case RecoveryUI::MOUNT_SYSTEM:
+#ifndef NO_RECOVERY_MOUNT
+            ensure_path_mounted("/system");
+            Print("Mounted /system.");
+#endif
+            break;
         }
     }
 }
@@ -258,8 +269,41 @@
     pthread_mutex_unlock(&key_queue_mutex);
 }
 
+// The default CheckKey implementation assumes the device has power,
+// volume up, and volume down keys.
+//
+// - Hold power and press vol-up to toggle display.
+// - Press power seven times in a row to reboot.
+// - Alternate vol-up and vol-down seven times to mount /system.
 RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) {
-    return RecoveryUI::ENQUEUE;
+    if (IsKeyPressed(KEY_POWER) && key == KEY_VOLUMEUP) {
+        return TOGGLE;
+    }
+
+    if (key == KEY_POWER) {
+        ++consecutive_power_keys;
+        if (consecutive_power_keys >= 7) {
+            return REBOOT;
+        }
+    } else {
+        consecutive_power_keys = 0;
+    }
+
+    if ((key == KEY_VOLUMEUP &&
+         (last_key == KEY_VOLUMEDOWN || last_key == -1)) ||
+        (key == KEY_VOLUMEDOWN &&
+         (last_key == KEY_VOLUMEUP || last_key == -1))) {
+        ++consecutive_alternate_keys;
+        if (consecutive_alternate_keys >= 7) {
+            consecutive_alternate_keys = 0;
+            return MOUNT_SYSTEM;
+        }
+    } else {
+        consecutive_alternate_keys = 0;
+    }
+    last_key = key;
+
+    return ENQUEUE;
 }
 
 void RecoveryUI::NextCheckKeyIsLong(bool is_long_press) {
diff --git a/ui.h b/ui.h
index 0757260..faa0acd 100644
--- a/ui.h
+++ b/ui.h
@@ -79,7 +79,7 @@
     // Return value indicates whether an immediate operation should be
     // triggered (toggling the display, rebooting the device), or if
     // the key should be enqueued for use by the main thread.
-    enum KeyAction { ENQUEUE, TOGGLE, REBOOT, IGNORE };
+    enum KeyAction { ENQUEUE, TOGGLE, REBOOT, IGNORE, MOUNT_SYSTEM };
     virtual KeyAction CheckKey(int key);
 
     // Called immediately before each call to CheckKey(), tell you if
@@ -123,6 +123,10 @@
     int key_down_count;                // under key_queue_mutex
     int rel_sum;
 
+    int consecutive_power_keys;
+    int consecutive_alternate_keys;
+    int last_key;
+
     typedef struct {
         RecoveryUI* ui;
         int key_code;
@@ -132,7 +136,7 @@
     pthread_t input_t;
 
     static void* input_thread(void* cookie);
-    static int input_callback(int fd, short revents, void* data);
+    static int input_callback(int fd, uint32_t epevents, void* data);
     void process_key(int key_code, int updown);
     bool usb_connected();
 
diff --git a/uncrypt/Android.mk b/uncrypt/Android.mk
new file mode 100644
index 0000000..756bc96
--- /dev/null
+++ b/uncrypt/Android.mk
@@ -0,0 +1,28 @@
+# Copyright (C) 2014 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.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := uncrypt.c
+
+LOCAL_MODULE := uncrypt
+
+LOCAL_STATIC_LIBRARIES := \
+	libfs_mgr \
+	libcutils \
+	libc
+
+include $(BUILD_EXECUTABLE)
diff --git a/uncrypt/uncrypt.c b/uncrypt/uncrypt.c
new file mode 100644
index 0000000..1f0f59d
--- /dev/null
+++ b/uncrypt/uncrypt.c
@@ -0,0 +1,377 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+// This program takes a file on an ext4 filesystem and produces a list
+// of the blocks that file occupies, which enables the file contents
+// to be read directly from the block device without mounting the
+// filesystem.
+//
+// If the filesystem is using an encrypted block device, it will also
+// read the file and rewrite it to the same blocks of the underlying
+// (unencrypted) block device, so the file contents can be read
+// without the need for the decryption key.
+//
+// The output of this program is a "block map" which looks like this:
+//
+//     /dev/block/platform/msm_sdcc.1/by-name/userdata     # block device
+//     49652 4096                        # file size in bytes, block size
+//     3                                 # count of block ranges
+//     1000 1008                         # block range 0
+//     2100 2102                         # ... block range 1
+//     30 33                             # ... block range 2
+//
+// Each block range represents a half-open interval; the line "30 33"
+// reprents the blocks [30, 31, 32].
+//
+// Recovery can take this block map file and retrieve the underlying
+// file data to use as an update package.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <sys/mman.h>
+
+#include <cutils/properties.h>
+#include <fs_mgr.h>
+
+#define WINDOW_SIZE 5
+#define RECOVERY_COMMAND_FILE "/cache/recovery/command"
+#define RECOVERY_COMMAND_FILE_TMP "/cache/recovery/command.tmp"
+#define CACHE_BLOCK_MAP "/cache/recovery/block.map"
+
+static int write_at_offset(unsigned char* buffer, size_t size,
+                           int wfd, off64_t offset)
+{
+    lseek64(wfd, offset, SEEK_SET);
+    size_t written = 0;
+    while (written < size) {
+        ssize_t wrote = write(wfd, buffer + written, size - written);
+        if (wrote < 0) {
+            fprintf(stderr, "error writing offset %lld: %s\n", offset, strerror(errno));
+            return -1;
+        }
+        written += wrote;
+    }
+    return 0;
+}
+
+void add_block_to_ranges(int** ranges, int* range_alloc, int* range_used, int new_block)
+{
+    // If the current block start is < 0, set the start to the new
+    // block.  (This only happens for the very first block of the very
+    // first range.)
+    if ((*ranges)[*range_used*2-2] < 0) {
+        (*ranges)[*range_used*2-2] = new_block;
+        (*ranges)[*range_used*2-1] = new_block;
+    }
+
+    if (new_block == (*ranges)[*range_used*2-1]) {
+        // If the new block comes immediately after the current range,
+        // all we have to do is extend the current range.
+        ++(*ranges)[*range_used*2-1];
+    } else {
+        // We need to start a new range.
+
+        // If there isn't enough room in the array, we need to expand it.
+        if (*range_used >= *range_alloc) {
+            *range_alloc *= 2;
+            *ranges = realloc(*ranges, *range_alloc * 2 * sizeof(int));
+        }
+
+        ++*range_used;
+        (*ranges)[*range_used*2-2] = new_block;
+        (*ranges)[*range_used*2-1] = new_block+1;
+    }
+}
+
+const char* find_block_device(const char* path, int* encryptable, int* encrypted)
+{
+    // The fstab path is always "/fstab.${ro.hardware}".
+    char fstab_path[PATH_MAX+1] = "/fstab.";
+    if (!property_get("ro.hardware", fstab_path+strlen(fstab_path), "")) {
+        fprintf(stderr, "failed to get ro.hardware\n");
+        return NULL;
+    }
+
+    struct fstab* fstab = fs_mgr_read_fstab(fstab_path);
+    if (!fstab) {
+        fprintf(stderr, "failed to read %s\n", fstab_path);
+        return NULL;
+    }
+
+    // Look for a volume whose mount point is the prefix of path and
+    // return its block device.  Set encrypted if it's currently
+    // encrypted.
+    int i;
+    for (i = 0; i < fstab->num_entries; ++i) {
+        struct fstab_rec* v = &fstab->recs[i];
+        if (!v->mount_point) continue;
+        int len = strlen(v->mount_point);
+        if (strncmp(path, v->mount_point, len) == 0 &&
+            (path[len] == '/' || path[len] == 0)) {
+            *encrypted = 0;
+            *encryptable = 0;
+            if (fs_mgr_is_encryptable(v)) {
+                *encryptable = 1;
+                char buffer[PROPERTY_VALUE_MAX+1];
+                if (property_get("ro.crypto.state", buffer, "") &&
+                    strcmp(buffer, "encrypted") == 0) {
+                    *encrypted = 1;
+                }
+            }
+            return v->blk_device;
+        }
+    }
+
+    return NULL;
+}
+
+char* parse_recovery_command_file()
+{
+    char* fn = NULL;
+    int count = 0;
+    char temp[1024];
+
+    FILE* fo = fopen(RECOVERY_COMMAND_FILE_TMP, "w");
+
+    FILE* f = fopen(RECOVERY_COMMAND_FILE, "r");
+    while (fgets(temp, sizeof(temp), f)) {
+        printf("read: %s", temp);
+        if (strncmp(temp, "--update_package=", strlen("--update_package=")) == 0) {
+            fn = strdup(temp + strlen("--update_package="));
+            strcpy(temp, "--update_package=@" CACHE_BLOCK_MAP "\n");
+        }
+        fputs(temp, fo);
+    }
+    fclose(f);
+    fclose(fo);
+
+    if (fn) {
+        char* newline = strchr(fn, '\n');
+        if (newline) *newline = 0;
+    }
+    return fn;
+}
+
+int produce_block_map(const char* path, const char* map_file, const char* blk_dev,
+                      int encrypted)
+{
+    struct stat sb;
+    int ret;
+
+    FILE* mapf = fopen(map_file, "w");
+
+    ret = stat(path, &sb);
+    if (ret != 0) {
+        fprintf(stderr, "failed to stat %s\n", path);
+        return -1;
+    }
+
+    printf(" block size: %ld bytes\n", sb.st_blksize);
+
+    int blocks = ((sb.st_size-1) / sb.st_blksize) + 1;
+    printf("  file size: %lld bytes, %d blocks\n", sb.st_size, blocks);
+
+    int* ranges;
+    int range_alloc = 1;
+    int range_used = 1;
+    ranges = malloc(range_alloc * 2 * sizeof(int));
+    ranges[0] = -1;
+    ranges[1] = -1;
+
+    fprintf(mapf, "%s\n%lld %lu\n", blk_dev, sb.st_size, sb.st_blksize);
+
+    unsigned char* buffers[WINDOW_SIZE];
+    int i;
+    if (encrypted) {
+        for (i = 0; i < WINDOW_SIZE; ++i) {
+            buffers[i] = malloc(sb.st_blksize);
+        }
+    }
+    int head_block = 0;
+    int head = 0, tail = 0;
+    size_t pos = 0;
+
+    int fd = open(path, O_RDONLY);
+    if (fd < 0) {
+        fprintf(stderr, "failed to open fd for reading: %s\n", strerror(errno));
+        return -1;
+    }
+    fsync(fd);
+
+    int wfd = -1;
+    if (encrypted) {
+        wfd = open(blk_dev, O_WRONLY);
+        if (wfd < 0) {
+            fprintf(stderr, "failed to open fd for writing: %s\n", strerror(errno));
+            return -1;
+        }
+    }
+
+    while (pos < sb.st_size) {
+        if ((tail+1) % WINDOW_SIZE == head) {
+            // write out head buffer
+            int block = head_block;
+            ret = ioctl(fd, FIBMAP, &block);
+            if (ret != 0) {
+                fprintf(stderr, "failed to find block %d\n", head_block);
+                return -1;
+            }
+            add_block_to_ranges(&ranges, &range_alloc, &range_used, block);
+            if (encrypted) {
+                if (write_at_offset(buffers[head], sb.st_blksize, wfd, (off64_t)sb.st_blksize * block) != 0) {
+                    return -1;
+                }
+            }
+            head = (head + 1) % WINDOW_SIZE;
+            ++head_block;
+        }
+
+        // read next block to tail
+        if (encrypted) {
+            size_t so_far = 0;
+            while (so_far < sb.st_blksize && pos < sb.st_size) {
+                ssize_t this_read = read(fd, buffers[tail] + so_far, sb.st_blksize - so_far);
+                if (this_read < 0) {
+                    fprintf(stderr, "failed to read: %s\n", strerror(errno));
+                    return -1;
+                }
+                so_far += this_read;
+                pos += this_read;
+            }
+        } else {
+            // If we're not encrypting; we don't need to actually read
+            // anything, just skip pos forward as if we'd read a
+            // block.
+            pos += sb.st_blksize;
+        }
+        tail = (tail+1) % WINDOW_SIZE;
+    }
+
+    while (head != tail) {
+        // write out head buffer
+        int block = head_block;
+        ret = ioctl(fd, FIBMAP, &block);
+        if (ret != 0) {
+            fprintf(stderr, "failed to find block %d\n", head_block);
+            return -1;
+        }
+        add_block_to_ranges(&ranges, &range_alloc, &range_used, block);
+        if (encrypted) {
+            if (write_at_offset(buffers[head], sb.st_blksize, wfd, (off64_t)sb.st_blksize * block) != 0) {
+                return -1;
+            }
+        }
+        head = (head + 1) % WINDOW_SIZE;
+        ++head_block;
+    }
+
+    fprintf(mapf, "%d\n", range_used);
+    for (i = 0; i < range_used; ++i) {
+        fprintf(mapf, "%d %d\n", ranges[i*2], ranges[i*2+1]);
+    }
+
+    fclose(mapf);
+    close(fd);
+    if (encrypted) {
+        close(wfd);
+    }
+
+    return 0;
+}
+
+void reboot_to_recovery() {
+    property_set("sys.powerctl", "reboot,recovery");
+    sleep(10);
+}
+
+int main(int argc, char** argv)
+{
+    const char* input_path;
+    const char* map_file;
+    int do_reboot = 1;
+
+    if (argc != 1 && argc != 3) {
+        fprintf(stderr, "usage: %s [<transform_path> <map_file>]\n", argv[0]);
+        return 2;
+    }
+
+    if (argc == 3) {
+        // when command-line args are given this binary is being used
+        // for debugging; don't reboot to recovery at the end.
+        input_path = argv[1];
+        map_file = argv[2];
+        do_reboot = 0;
+    } else {
+        input_path = parse_recovery_command_file();
+        if (input_path == NULL) {
+            // if we're rebooting to recovery without a package (say,
+            // to wipe data), then we don't need to do anything before
+            // going to recovery.
+            fprintf(stderr, "no recovery command file or no update package arg");
+            reboot_to_recovery();
+            return 1;
+        }
+        map_file = CACHE_BLOCK_MAP;
+    }
+
+    // Turn the name of the file we're supposed to convert into an
+    // absolute path, so we can find what filesystem it's on.
+    char path[PATH_MAX+1];
+    if (realpath(input_path, path) == NULL) {
+        fprintf(stderr, "failed to convert %s to absolute path: %s\n", input_path, strerror(errno));
+        return 1;
+    }
+
+    int encryptable;
+    int encrypted;
+    const char* blk_dev = find_block_device(path, &encryptable, &encrypted);
+    if (blk_dev == NULL) {
+        fprintf(stderr, "failed to find block device for %s\n", path);
+        return 1;
+    }
+
+    // If the filesystem it's on isn't encrypted, we only produce the
+    // block map, we don't rewrite the file contents (it would be
+    // pointless to do so).
+    printf("encryptable: %s\n", encryptable ? "yes" : "no");
+    printf("  encrypted: %s\n", encrypted ? "yes" : "no");
+
+    if (!encryptable) {
+        // If the file is on a filesystem that doesn't support
+        // encryption (eg, /cache), then leave it alone.
+        //
+        // TODO: change this to be !encrypted -- if the file is on
+        // /data but /data isn't encrypted, we don't need to use the
+        // block map mechanism.  We do for now so as to get more
+        // testing of it (since most dogfood devices aren't
+        // encrypted).
+
+        unlink(RECOVERY_COMMAND_FILE_TMP);
+    } else {
+        if (produce_block_map(path, map_file, blk_dev, encrypted) != 0) {
+            return 1;
+        }
+    }
+
+    rename(RECOVERY_COMMAND_FILE_TMP, RECOVERY_COMMAND_FILE);
+    reboot_to_recovery();
+    return 0;
+}
diff --git a/updater/updater.c b/updater/updater.c
index c7009fe..4e1cc9c 100644
--- a/updater/updater.c
+++ b/updater/updater.c
@@ -22,6 +22,7 @@
 #include "updater.h"
 #include "install.h"
 #include "minzip/Zip.h"
+#include "minzip/SysUtil.h"
 
 // Generated by the makefile, this function defines the
 // RegisterDeviceExtensions() function, which calls all the
@@ -65,19 +66,24 @@
 
     // Extract the script from the package.
 
-    char* package_data = argv[3];
+    const char* package_filename = argv[3];
+    MemMapping map;
+    if (sysMapFile(package_filename, &map) != 0) {
+        printf("failed to map package %s\n", argv[3]);
+        return 3;
+    }
     ZipArchive za;
     int err;
-    err = mzOpenZipArchive(package_data, &za);
+    err = mzOpenZipArchive(map.addr, map.length, &za);
     if (err != 0) {
         printf("failed to open package %s: %s\n",
-                package_data, strerror(err));
+               argv[3], strerror(err));
         return 3;
     }
 
     const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
     if (script_entry == NULL) {
-        printf("failed to find %s in %s\n", SCRIPT_NAME, package_data);
+        printf("failed to find %s in %s\n", SCRIPT_NAME, package_filename);
         return 4;
     }
 
@@ -152,6 +158,7 @@
     if (updater_info.package_zip) {
         mzCloseZipArchive(updater_info.package_zip);
     }
+    sysReleaseMap(&map);
     free(script);
 
     return 0;
diff --git a/verifier.cpp b/verifier.cpp
index 0930fbd..55d58ee 100644
--- a/verifier.cpp
+++ b/verifier.cpp
@@ -111,15 +111,10 @@
 // Return VERIFY_SUCCESS, VERIFY_FAILURE (if any error is encountered
 // or no key matches the signature).
 
-int verify_file(const char* path, const Certificate* pKeys, unsigned int numKeys) {
+int verify_file(unsigned char* addr, size_t length,
+                const Certificate* pKeys, unsigned int numKeys) {
     ui->SetProgress(0.0);
 
-    FILE* f = fopen(path, "rb");
-    if (f == NULL) {
-        LOGE("failed to open %s (%s)\n", path, strerror(errno));
-        return VERIFY_FAILURE;
-    }
-
     // An archive with a whole-file signature will end in six bytes:
     //
     //   (2-byte signature start) $ff $ff (2-byte comment size)
@@ -131,22 +126,15 @@
 
 #define FOOTER_SIZE 6
 
-    if (fseek(f, -FOOTER_SIZE, SEEK_END) != 0) {
-        LOGE("failed to seek in %s (%s)\n", path, strerror(errno));
-        fclose(f);
+    if (length < FOOTER_SIZE) {
+        LOGE("not big enough to contain footer\n");
         return VERIFY_FAILURE;
     }
 
-    unsigned char footer[FOOTER_SIZE];
-    if (fread(footer, 1, FOOTER_SIZE, f) != FOOTER_SIZE) {
-        LOGE("failed to read footer from %s (%s)\n", path, strerror(errno));
-        fclose(f);
-        return VERIFY_FAILURE;
-    }
+    unsigned char* footer = addr + length - FOOTER_SIZE;
 
     if (footer[2] != 0xff || footer[3] != 0xff) {
         LOGE("footer is wrong\n");
-        fclose(f);
         return VERIFY_FAILURE;
     }
 
@@ -157,7 +145,6 @@
 
     if (signature_start <= FOOTER_SIZE) {
         LOGE("Signature start is in the footer");
-        fclose(f);
         return VERIFY_FAILURE;
     }
 
@@ -167,9 +154,8 @@
     // comment length.
     size_t eocd_size = comment_size + EOCD_HEADER_SIZE;
 
-    if (fseek(f, -eocd_size, SEEK_END) != 0) {
-        LOGE("failed to seek in %s (%s)\n", path, strerror(errno));
-        fclose(f);
+    if (length < eocd_size) {
+        LOGE("not big enough to contain EOCD\n");
         return VERIFY_FAILURE;
     }
 
@@ -177,26 +163,15 @@
     // This is everything except the signature data and length, which
     // includes all of the EOCD except for the comment length field (2
     // bytes) and the comment data.
-    size_t signed_len = ftell(f) + EOCD_HEADER_SIZE - 2;
+    size_t signed_len = length - eocd_size + EOCD_HEADER_SIZE - 2;
 
-    unsigned char* eocd = (unsigned char*)malloc(eocd_size);
-    if (eocd == NULL) {
-        LOGE("malloc for EOCD record failed\n");
-        fclose(f);
-        return VERIFY_FAILURE;
-    }
-    if (fread(eocd, 1, eocd_size, f) != eocd_size) {
-        LOGE("failed to read eocd from %s (%s)\n", path, strerror(errno));
-        fclose(f);
-        return VERIFY_FAILURE;
-    }
+    unsigned char* eocd = addr + length - eocd_size;
 
     // If this is really is the EOCD record, it will begin with the
     // magic number $50 $4b $05 $06.
     if (eocd[0] != 0x50 || eocd[1] != 0x4b ||
         eocd[2] != 0x05 || eocd[3] != 0x06) {
         LOGE("signature length doesn't match EOCD marker\n");
-        fclose(f);
         return VERIFY_FAILURE;
     }
 
@@ -209,7 +184,6 @@
             // which could be exploitable.  Fail verification if
             // this sequence occurs anywhere after the real one.
             LOGE("EOCD marker occurs after start of EOCD\n");
-            fclose(f);
             return VERIFY_FAILURE;
         }
     }
@@ -229,35 +203,23 @@
     SHA256_CTX sha256_ctx;
     SHA_init(&sha1_ctx);
     SHA256_init(&sha256_ctx);
-    unsigned char* buffer = (unsigned char*)malloc(BUFFER_SIZE);
-    if (buffer == NULL) {
-        LOGE("failed to alloc memory for sha1 buffer\n");
-        fclose(f);
-        return VERIFY_FAILURE;
-    }
 
     double frac = -1.0;
     size_t so_far = 0;
-    fseek(f, 0, SEEK_SET);
     while (so_far < signed_len) {
-        size_t size = BUFFER_SIZE;
-        if (signed_len - so_far < size) size = signed_len - so_far;
-        if (fread(buffer, 1, size, f) != size) {
-            LOGE("failed to read data from %s (%s)\n", path, strerror(errno));
-            fclose(f);
-            return VERIFY_FAILURE;
-        }
-        if (need_sha1) SHA_update(&sha1_ctx, buffer, size);
-        if (need_sha256) SHA256_update(&sha256_ctx, buffer, size);
+        size_t size = signed_len - so_far;
+        if (size > BUFFER_SIZE) size = BUFFER_SIZE;
+
+        if (need_sha1) SHA_update(&sha1_ctx, addr + so_far, size);
+        if (need_sha256) SHA256_update(&sha256_ctx, addr + so_far, size);
         so_far += size;
+
         double f = so_far / (double)signed_len;
         if (f > frac + 0.02 || size == so_far) {
             ui->SetProgress(f);
             frac = f;
         }
     }
-    fclose(f);
-    free(buffer);
 
     const uint8_t* sha1 = SHA_final(&sha1_ctx);
     const uint8_t* sha256 = SHA256_final(&sha256_ctx);
@@ -269,10 +231,8 @@
     if (!read_pkcs7(eocd + eocd_size - signature_start, signature_size, &sig_der,
             &sig_der_length)) {
         LOGE("Could not find signature DER block\n");
-        free(eocd);
         return VERIFY_FAILURE;
     }
-    free(eocd);
 
     /*
      * Check to make sure at least one of the keys matches the signature. Since
diff --git a/verifier.h b/verifier.h
index 023d3bf..15f8d98 100644
--- a/verifier.h
+++ b/verifier.h
@@ -37,10 +37,13 @@
     ECPublicKey* ec;
 } Certificate;
 
-/* Look in the file for a signature footer, and verify that it
- * matches one of the given keys.  Return one of the constants below.
+/* addr and length define a an update package file that has been
+ * loaded (or mmap'ed, or whatever) into memory.  Verify that the file
+ * is signed and the signature matches one of the given keys.  Return
+ * one of the constants below.
  */
-int verify_file(const char* path, const Certificate *pKeys, unsigned int numKeys);
+int verify_file(unsigned char* addr, size_t length,
+                const Certificate *pKeys, unsigned int numKeys);
 
 Certificate* load_keys(const char* filename, int* numKeys);
 
diff --git a/verifier_test.cpp b/verifier_test.cpp
index 88fcad4..10a5dda 100644
--- a/verifier_test.cpp
+++ b/verifier_test.cpp
@@ -17,12 +17,16 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 #include "common.h"
 #include "verifier.h"
 #include "ui.h"
 #include "mincrypt/sha.h"
 #include "mincrypt/sha256.h"
+#include "minzip/SysUtil.h"
 
 // This is build/target/product/security/testkey.x509.pem after being
 // dumped out by dumpkey.jar.
@@ -227,7 +231,13 @@
 
     ui = new FakeUI();
 
-    int result = verify_file(argv[argn], certs, num_keys);
+    MemMapping map;
+    if (sysMapFile(argv[argn], &map) != 0) {
+        fprintf(stderr, "failed to mmap %s: %s\n", argv[argn], strerror(errno));
+        return 4;
+    }
+
+    int result = verify_file(map.addr, map.length, certs, num_keys);
     if (result == VERIFY_SUCCESS) {
         printf("VERIFIED\n");
         return 0;