1 files changed, 48 insertions, 0 deletions
diff --git a/include/llvm/Wrap/file_wrapper_input.h b/include/llvm/Wrap/file_wrapper_input.h
new file mode 100644
index 0000000000..9f3de004c4
--- /dev/null
+++ b/include/llvm/Wrap/file_wrapper_input.h
@@ -0,0 +1,48 @@
+/* Copyright 2012 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can
+ * be found in the LICENSE file.
+ */
+
+// Defines utility allowing files for bitcode input wrapping.
+
+#ifndef FILE_WRAPPER_INPUT_H__
+#define FILE_WRAPPER_INPUT_H__
+
+#include "llvm/Support/support_macros.h"
+#include "llvm/Wrap/wrapper_input.h"
+
+#include <stdio.h>
+#include <string>
+
+// Define a class to wrap named files.
+class FileWrapperInput : public WrapperInput {
+ public:
+  FileWrapperInput(const std::string& name);
+  ~FileWrapperInput();
+  // Tries to read the requested number of bytes into the buffer. Returns the
+  // actual number of bytes read.
+  virtual size_t Read(uint8_t* buffer, size_t wanted);
+  // Returns true if at end of file. Note: May return false
+  // until Read is called, and returns 0.
+  virtual bool AtEof();
+  // Returns the size of the file (in bytes).
+  virtual off_t Size();
+  // Moves to the given offset within the file. Returns
+  // false if unable to move to that position.
+  virtual bool Seek(uint32_t pos);
+ private:
+  // The name of the file.
+  std::string _name;
+  // True once eof has been encountered.
+  bool _at_eof;
+  // True if size has been computed.
+  bool _size_found;
+  // The size of the file.
+  off_t _size;
+  // The corresponding (opened) file.
+  FILE* _file;
+ private:
+  DISALLOW_CLASS_COPY_AND_ASSIGN(FileWrapperInput);
+};
+
+#endif // FILE_WRAPPER_INPUT_H__