Support: Functions for writing endian specific data to streams.

This adds a new header, EndianStream.h, which supplies an adaptor for
writing endian specific data to a raw_ostream.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205032 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/EndianStream.h b/include/llvm/Support/EndianStream.h
new file mode 100644 (file)
index 0000000..89c66d3
--- /dev/null
+++ b/include/llvm/Support/EndianStream.h
@@ -0,0 +1,39 @@
+//===- EndianStream.h - Stream ops with endian specific data ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines utilities for operating on streams that have endian
+// specific data.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LLVM_SUPPORT_ENDIAN_STREAM_H_
+#define _LLVM_SUPPORT_ENDIAN_STREAM_H_
+
+#include <llvm/Support/Endian.h>
+#include <llvm/Support/raw_ostream.h>
+
+namespace llvm {
+namespace support {
+
+namespace endian {
+/// Adapter to write values to a stream in a particular byte order.
+template <endianness endian> struct Writer {
+  raw_ostream &OS;
+  Writer(raw_ostream &OS) : OS(OS) {}
+  template <typename value_type> void write(value_type Val) {
+    Val = byte_swap<value_type, endian>(Val);
+    OS.write((const char *)&Val, sizeof(value_type));
+  }
+};
+} // end namespace endian
+
+} // end namespace support
+} // end namespace llvm
+
+#endif // _LLVM_SUPPORT_ENDIAN_STREAM_H_