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diff --git a/Source/cmArchiveWrite.h b/Source/cmArchiveWrite.h
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+++ b/Source/cmArchiveWrite.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2010 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmArchiveWrite_h
+#define cmArchiveWrite_h
+
+#include "cmStandardIncludes.h"
+
+#if !defined(CMAKE_BUILD_WITH_CMAKE)
+# error "cmArchiveWrite not allowed during bootstrap build!"
+#endif
+
+/** \class cmArchiveWrite
+ * \brief Wrapper around libarchive for writing.
+ *
+ */
+class cmArchiveWrite
+{
+  typedef void (cmArchiveWrite::* safe_bool)();
+  void safe_bool_true() {}
+public:
+  /** Compression type.  */
+  enum Compress
+  {
+    CompressNone,
+    CompressCompress,
+    CompressGZip,
+    CompressBZip2,
+    CompressLZMA,
+    CompressXZ
+  };
+
+  /** Archive Type */
+  enum Type
+  {
+    TypeTAR,
+    TypeZIP
+  };
+
+  /** Construct with output stream to which to write archive.  */
+  cmArchiveWrite(std::ostream& os, Compress c = CompressNone, Type = TypeTAR);
+  ~cmArchiveWrite();
+
+  /**
+   * Add a path (file or directory) to the archive.  Directories are
+   * added recursively.  The "path" must be readable on disk, either
+   * full path or relative to current working directory.  The "skip"
+   * value indicates how many leading bytes from the input path to
+   * skip.  The remaining part of the input path is appended to the
+   * "prefix" value to construct the final name in the archive.
+   */
+  bool Add(std::string path, size_t skip = 0, const char* prefix = 0);
+
+  /** Returns true if there has been no error.  */
+  operator safe_bool() const
+    { return this->Okay()? &cmArchiveWrite::safe_bool_true : 0; }
+
+  /** Returns true if there has been an error.  */
+  bool operator!() const { return !this->Okay(); }
+
+  /** Return the error string; empty if none.  */
+  std::string GetError() const { return this->Error; }
+
+  // TODO: More general callback instead of hard-coding calls to
+  // std::cout.
+  void SetVerbose(bool v) { this->Verbose = v; }
+
+private:
+  bool Okay() const { return this->Error.empty(); }
+  bool AddPath(const char* path, size_t skip, const char* prefix);
+  bool AddFile(const char* file, size_t skip, const char* prefix);
+  bool AddData(const char* file, size_t size);
+
+  struct Callback;
+  friend struct Callback;
+
+  class Entry;
+
+  std::ostream& Stream;
+  struct archive* Archive;
+  struct archive* Disk;
+  bool Verbose;
+  std::string Error;
+};
+
+#endif