Move Courgette...

courgette/third_party/bsdiff.h

+/*-
+ * 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>
+ * 2009-03-31 - Change to use Streams.  Move CRC code to crc.{h,cc}
+ *              Changed status to an enum, removed unused status codes.
+ *                --Stephen Adams <sra@chromium.org>
+ */
+
+#ifndef COURGETTE_BSDIFF_H_
+#define COURGETTE_BSDIFF_H_
+
+#include "base/basictypes.h"
+
+namespace courgette {
+
+enum BSDiffStatus {
+  OK = 0,
+  MEM_ERROR = 1,
+  CRC_ERROR = 2,
+  READ_ERROR = 3,
+  UNEXPECTED_ERROR = 4
+};
+
+class SourceStream;
+class SinkStream;
+
+// Creates a binary patch.
+//
+BSDiffStatus CreateBinaryPatch(SourceStream* old_stream,
+                               SourceStream* new_stream,
+                               SinkStream* patch_stream);
+
+// Applies the given patch file to a given source file. This method validates
+// the CRC of the original file stored in the patch file, before applying the
+// patch to it.
+//
+BSDiffStatus ApplyBinaryPatch(SourceStream* old_stream,
+                              SourceStream* patch_stream,
+                              SinkStream* new_stream);
+
+
+// The following declarations are common to the patch-creation and
+// patch-application code.
+
+// The patch stream starts with a MBSPatchHeader.
+typedef struct MBSPatchHeader_ {
+  char tag[8];       // Contains MBS_PATCH_HEADER_TAG
+  uint32 slen;       // Length of the file to be patched.
+  uint32 scrc32;     // CRC32 of the file to be patched.
+  uint32 dlen;       // Length of the result file.
+  uint32 cblen;      // Length of the control block in bytes.
+  uint32 difflen;    // Length of the diff block in bytes.
+  uint32 extralen;   // Length of the extra block in bytes.
+} MBSPatchHeader;
+
+// This is the value for the tag field.  Must match length exactly, not counting
+// null at end of string.
+#define MBS_PATCH_HEADER_TAG "GBSDIF42"
+
+}  // namespace
+#endif  // COURGETTE_BSDIFF_H_