diff --git a/fastbootd/utils.c b/fastbootd/utils.c
new file mode 100644
index 0000000..16e1c09
--- /dev/null
+++ b/fastbootd/utils.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2009-2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name of Google, Inc. nor the names of its contributors
+ *    may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+
+#include "utils.h"
+#include "debug.h"
+
+#ifndef BLKDISCARD
+#define BLKDISCARD _IO(0x12,119)
+#endif
+
+#ifndef BLKSECDISCARD
+#define BLKSECDISCARD _IO(0x12,125)
+#endif
+
+
+int get_stream_size(FILE *stream) {
+    int size;
+    fseek(stream, 0, SEEK_END);
+    size = ftell(stream);
+    fseek(stream, 0, SEEK_SET);
+    return size;
+}
+
+uint64_t get_block_device_size(int fd)
+{
+    uint64_t size = 0;
+    int ret;
+
+    ret = ioctl(fd, BLKGETSIZE64, &size);
+
+    if (ret)
+        return 0;
+
+    return size;
+}
+
+uint64_t get_file_size(int fd)
+{
+    struct stat buf;
+    int ret;
+    int64_t computed_size;
+
+    ret = fstat(fd, &buf);
+    if (ret)
+        return 0;
+
+    if (S_ISREG(buf.st_mode))
+        computed_size = buf.st_size;
+    else if (S_ISBLK(buf.st_mode))
+        computed_size = get_block_device_size(fd);
+    else
+        computed_size = 0;
+
+    return computed_size;
+}
+
+uint64_t get_file_size64(int fd)
+{
+    struct stat64 buf;
+    int ret;
+    uint64_t computed_size;
+
+    ret = fstat64(fd, &buf);
+    if (ret)
+        return 0;
+
+    if (S_ISREG(buf.st_mode))
+        computed_size = buf.st_size;
+    else if (S_ISBLK(buf.st_mode))
+        computed_size = get_block_device_size(fd);
+    else
+        computed_size = 0;
+
+    return computed_size;
+}
+
+
+char *strip(char *str)
+{
+    int n;
+
+    n = strspn(str, " \t");
+    str += n;
+    n = strcspn(str, " \t");
+    str[n] = '\0';
+
+    return str;
+}
+
+int wipe_block_device(int fd, int64_t len)
+{
+    uint64_t range[2];
+    int ret;
+
+    range[0] = 0;
+    range[1] = len;
+    ret = ioctl(fd, BLKSECDISCARD, &range);
+    if (ret < 0) {
+        range[0] = 0;
+        range[1] = len;
+        ret = ioctl(fd, BLKDISCARD, &range);
+        if (ret < 0) {
+            D(WARN, "Discard failed\n");
+            return 1;
+        } else {
+            D(WARN, "Wipe via secure discard failed, used discard instead\n");
+            return 0;
+        }
+    }
+
+    return 0;
+}
+