Split *AndAdjustOffset() functions into their own header, to restore utf_string_conversions.h to a simple, readable state.

BUG=4010
TEST=none
Review URL: http://codereview.chromium.org/387012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31928 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 35 insertions, 0 deletions

diff --git a/base/utf_offset_string_conversions.h b/base/utf_offset_string_conversions.h
new file mode 100644
index 0000000..0a1a682
--- /dev/null
+++ b/base/utf_offset_string_conversions.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_UTF_OFFSET_STRING_CONVERSIONS_H_
+#define BASE_UTF_OFFSET_STRING_CONVERSIONS_H_
+
+#include <string>
+
+#include "base/string16.h"
+
+namespace base {
+class StringPiece;
+}
+
+// Like the conversions in utf_string_conversions.h, but also take offsets into
+// the source strings, which will be adjusted to point at the same logical place
+// in the result strings.  If this isn't possible because the offsets point past
+// the end of the source strings or into the middle of multibyte sequences, they
+// will be set to std::wstring::npos.  |offset_for_adjustment| may be NULL.
+bool UTF8ToWideAndAdjustOffset(const char* src,
+                               size_t src_len,
+                               std::wstring* output,
+                               size_t* offset_for_adjustment);
+std::wstring UTF8ToWideAndAdjustOffset(const base::StringPiece& utf8,
+                                       size_t* offset_for_adjustment);
+
+bool UTF16ToWideAndAdjustOffset(const char16* src,
+                                size_t src_len,
+                                std::wstring* output,
+                                size_t* offset_for_adjustment);
+std::wstring UTF16ToWideAndAdjustOffset(const string16& utf16,
+                                        size_t* offset_for_adjustment);
+
+#endif  // BASE_UTF_OFFSET_STRING_CONVERSIONS_H_