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diff --git a/toolkit/mozapps/update/updater/bspatch/bspatch.h b/toolkit/mozapps/update/updater/bspatch/bspatch.h
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+++ b/toolkit/mozapps/update/updater/bspatch/bspatch.h
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+/*-
+ * Copyright 2003,2004 Colin Percival
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted providing that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ * Changelog:
+ * 2005-04-26 - Define the header as a C structure, add a CRC32 checksum to
+ *              the header, and make all the types 32-bit.
+ *                --Benjamin Smedberg <benjamin@smedbergs.us>
+ */
+
+#ifndef bspatch_h__
+#define bspatch_h__
+
+#include <stdint.h>
+#include <stdio.h>
+
+typedef struct MBSPatchHeader_ {
+  /* "MBDIFF10" */
+  char tag[8];
+
+  /* Length of the file to be patched */
+  uint32_t slen;
+
+  /* CRC32 of the file to be patched */
+  uint32_t scrc32;
+
+  /* Length of the result file */
+  uint32_t dlen;
+
+  /* Length of the control block in bytes */
+  uint32_t cblen;
+
+  /* Length of the diff block in bytes */
+  uint32_t difflen;
+
+  /* Length of the extra block in bytes */
+  uint32_t extralen;
+
+  /* Control block (MBSPatchTriple[]) */
+  /* Diff block (binary data) */
+  /* Extra block (binary data) */
+} MBSPatchHeader;
+
+/**
+ * Read the header of a patch file into the MBSPatchHeader structure.
+ *
+ * @param fd Must have been opened for reading, and be at the beginning
+ *           of the file.
+ */
+int MBS_ReadHeader(FILE* file, MBSPatchHeader* header);
+
+/**
+ * Apply a patch. This method does not validate the checksum of the original
+ * file: client code should validate the checksum before calling this method.
+ *
+ * @param patchfd Must have been processed by MBS_ReadHeader
+ * @param fbuffer The original file read into a memory buffer of length
+ *                header->slen.
+ * @param filefd  Must have been opened for writing. Should be truncated
+ *                to header->dlen if it is an existing file. The offset
+ *                should be at the beginning of the file.
+ */
+int MBS_ApplyPatch(const MBSPatchHeader* header, FILE* patchFile,
+                   unsigned char* fbuffer, FILE* file);
+
+typedef struct MBSPatchTriple_ {
+  uint32_t x; /* add x bytes from oldfile to x bytes from the diff block */
+  uint32_t y; /* copy y bytes from the extra block */
+  int32_t z;  /* seek forwards in oldfile by z bytes */
+} MBSPatchTriple;
+
+#endif  // bspatch_h__