diff --git a/tools/dexpreopt/dexopt-wrapper/DexOptWrapper.cpp b/tools/dexpreopt/dexopt-wrapper/DexOptWrapper.cpp
new file mode 100644
index 0000000..358f0ca
--- /dev/null
+++ b/tools/dexpreopt/dexopt-wrapper/DexOptWrapper.cpp
@@ -0,0 +1,167 @@
+/*
+ * dexopt invocation test.
+ *
+ * You must have BOOTCLASSPATH defined.  On the simulator, you will also
+ * need ANDROID_ROOT.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/file.h>
+#include <fcntl.h>
+#include <errno.h>
+
+//using namespace android;
+
+/*
+ * Privilege reduction function.
+ *
+ * Returns 0 on success, nonzero on failure.
+ */
+static int privFunc(void)
+{
+    printf("--- would reduce privs here\n");
+    return 0;
+}
+
+/*
+ * We're in the child process.  exec dexopt.
+ */
+static void runDexopt(int zipFd, int odexFd, const char* inputFileName)
+{
+    static const char* kDexOptBin = "/bin/dexopt";
+    static const int kMaxIntLen = 12;   // '-'+10dig+'\0' -OR- 0x+8dig
+    char zipNum[kMaxIntLen];
+    char odexNum[kMaxIntLen];
+    const char* androidRoot;
+    char* execFile;
+
+    /* find dexopt executable; this exists for simulator compatibility */
+    androidRoot = getenv("ANDROID_ROOT");
+    if (androidRoot == NULL)
+        androidRoot = "/system";
+    execFile = (char*) malloc(strlen(androidRoot) + strlen(kDexOptBin) +1);
+    sprintf(execFile, "%s%s", androidRoot, kDexOptBin);
+
+    sprintf(zipNum, "%d", zipFd);
+    sprintf(odexNum, "%d", odexFd);
+
+    execl(execFile, execFile, "--zip", zipNum, odexNum, inputFileName,
+        (char*) NULL);
+    fprintf(stderr, "execl(%s) failed: %s\n", kDexOptBin, strerror(errno));
+}
+
+/*
+ * Run dexopt on the specified Jar/APK.
+ *
+ * This uses fork() and exec() to mimic the way this would work in an
+ * installer; in practice for something this simple you could just exec()
+ * unless you really wanted the status messages.
+ *
+ * Returns 0 on success.
+ */
+int doStuff(const char* zipName, const char* odexName)
+{
+    int zipFd, odexFd;
+
+    /*
+     * Open the zip archive and the odex file, creating the latter (and
+     * failing if it already exists).  This must be done while we still
+     * have sufficient privileges to read the source file and create a file
+     * in the target directory.  The "classes.dex" file will be extracted.
+     */
+    zipFd = open(zipName, O_RDONLY, 0);
+    if (zipFd < 0) {
+        fprintf(stderr, "Unable to open '%s': %s\n", zipName, strerror(errno));
+        return 1;
+    }
+
+    odexFd = open(odexName, O_RDWR | O_CREAT | O_EXCL, 0644);
+    if (odexFd < 0) {
+        fprintf(stderr, "Unable to create '%s': %s\n",
+            odexName, strerror(errno));
+        close(zipFd);
+        return 1;
+    }
+
+    printf("--- BEGIN '%s' (bootstrap=%d) ---\n", zipName, 0);
+
+    /*
+     * Fork a child process.
+     */
+    pid_t pid = fork();
+    if (pid == 0) {
+        /* child -- drop privs */
+        if (privFunc() != 0)
+            exit(66);
+
+        /* lock the input file */
+        if (flock(odexFd, LOCK_EX | LOCK_NB) != 0) {
+            fprintf(stderr, "Unable to lock '%s': %s\n",
+                odexName, strerror(errno));
+            exit(65);
+        }
+
+        runDexopt(zipFd, odexFd, zipName);  /* does not return */
+        exit(67);                           /* usually */
+    } else {
+        /* parent -- wait for child to finish */
+        printf("waiting for verify+opt, pid=%d\n", (int) pid);
+        int status, oldStatus;
+        pid_t gotPid;
+
+        close(zipFd);
+        close(odexFd);
+
+        /*
+         * Wait for the optimization process to finish.
+         */
+        while (true) {
+            gotPid = waitpid(pid, &status, 0);
+            if (gotPid == -1 && errno == EINTR) {
+                printf("waitpid interrupted, retrying\n");
+            } else {
+                break;
+            }
+        }
+        if (gotPid != pid) {
+            fprintf(stderr, "waitpid failed: wanted %d, got %d: %s\n",
+                (int) pid, (int) gotPid, strerror(errno));
+            return 1;
+        }
+
+        if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
+            printf("--- END '%s' (success) ---\n", zipName);
+            return 0;
+        } else {
+            printf("--- END '%s' --- status=0x%04x, process failed\n",
+                zipName, status);
+            return 1;
+        }
+    }
+
+    /* notreached */
+}
+
+/*
+ * Parse args, do stuff.
+ */
+int main(int argc, char** argv)
+{
+    if (argc < 3 || argc > 4) {
+        fprintf(stderr, "Usage: %s <input jar/apk> <output odex> "
+            "[<bootclasspath>]\n\n", argv[0]);
+        fprintf(stderr, "Example: dexopttest "
+            "/system/app/NotePad.apk /system/app/NotePad.odex\n");
+        return 2;
+    }
+
+    if (argc > 3) {
+        setenv("BOOTCLASSPATH", argv[3], 1);
+    }
+
+    return (doStuff(argv[1], argv[2]) != 0);
+}