This is the addition of the system-dependent string conversions. This is just the new code and changing logging to use it. I will change other things to use this and delete the code in string_util in a subsequent pass.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@479 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 156 insertions, 0 deletions

diff --git a/base/sys_string_conversions_mac.cc b/base/sys_string_conversions_mac.cc
new file mode 100644
index 0000000..e752a60
--- /dev/null
+++ b/base/sys_string_conversions_mac.cc
@@ -0,0 +1,156 @@
+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "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 COPYRIGHT
+// OWNER OR CONTRIBUTORS 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.
+
+#include "base/sys_strings.h"
+
+#include <CoreFoundation/CoreFoundation.h>
+
+namespace base {
+
+namespace {
+
+// Convert the supplied cfsring into the specified encoding, and return it as
+// an STL string of the template type.  Returns an empty string on failure.
+//
+// Do not assert in this function since it is used by the asssertion code!
+template<typename StringType>
+static StringType CFStringToSTLStringWithEncodingT(CFStringRef cfstring,
+                                                   CFStringEncoding encoding) {
+  CFIndex length = CFStringGetLength(cfstring);
+  if (length == 0)
+    return StringType();
+
+  CFRange whole_string = CFRangeMake(0, length);
+  CFIndex out_size;
+  CFIndex converted = CFStringGetBytes(cfstring,
+                                       whole_string,
+                                       encoding,
+                                       0,      // lossByte
+                                       false,  // isExternalRepresentation
+                                       NULL,   // buffer
+                                       0,      // maxBufLen
+                                       &out_size);
+  DCHECK(converted != 0 && out_size != 0);
+  if (converted == 0 || out_size == 0)
+    return StringType();
+
+  // out_size is the number of UInt8-sized units needed in the destination.
+  // A buffer allocated as UInt8 units might not be properly aligned to
+  // contain elements of StringType::value_type.  Use a container for the
+  // proper value_type, and convert out_size by figuring the number of
+  // value_type elements per UInt8.  Leave room for a NUL terminator.
+  typename StringType::size_type elements =
+      out_size * sizeof(UInt8) / sizeof(typename StringType::value_type) + 1;
+
+  std::vector<typename StringType::value_type> out_buffer(elements);
+  converted = CFStringGetBytes(cfstring,
+                               whole_string,
+                               encoding,
+                               0,      // lossByte
+                               false,  // isExternalRepresentation
+                               reinterpret_cast<UInt8*>(&out_buffer[0]),
+                               out_size,
+                               NULL);  // usedBufLen
+  if (converted == 0)
+    return StringType();
+
+  out_buffer[elements - 1] = '\0';
+  return StringType(&out_buffer[0]);
+}
+
+// Given an STL string |in| with an encoding specified by |in_encoding|,
+// convert it to |out_encoding| and return it as an STL string of the
+// |OutStringType| template type.  Returns an empty string on failure.
+//
+// Do not assert in this function since it is used by the asssertion code!
+template<typename OutStringType, typename InStringType>
+static OutStringType STLStringToSTLStringWithEncodingsT(
+    const InStringType& in,
+    CFStringEncoding in_encoding,
+    CFStringEncoding out_encoding) {
+  typename InStringType::size_type in_length = in.length();
+  if (in_length == 0)
+    return OutStringType();
+
+  scoped_cftyperef<CFStringRef> cfstring(
+      CFStringCreateWithBytesNoCopy(NULL,
+                                    reinterpret_cast<const UInt8*>(in.c_str()),
+                                    in_length *
+                                      sizeof(typename InStringType::value_type),
+                                    in_encoding,
+                                    false,
+                                    kCFAllocatorNull));
+  DCHECK(cfstring);
+  if (!cfstring)
+    return OutStringType();
+
+  return CFStringToSTLStringWithEncodingT<OutStringType>(cfstring,
+                                                         out_encoding);
+}
+
+// Specify the byte ordering explicitly, otherwise CFString will be confused
+// when strings don't carry BOMs, as they typically won't.
+static const CFStringEncoding kNarrowStringEncoding = kCFStringEncodingUTF8;
+#ifdef __BIG_ENDIAN__
+#if defined(__WCHAR_MAX__) && __WCHAR_MAX__ == 0xffff
+static const CFStringEncoding kWideStringEncoding = kCFStringEncodingUTF16BE;
+#else  // __WCHAR_MAX__
+static const CFStringEncoding kWideStringEncoding = kCFStringEncodingUTF32BE;
+#endif  // __WCHAR_MAX__
+#else  // __BIG_ENDIAN__
+#if defined(__WCHAR_MAX__) && __WCHAR_MAX__ == 0xffff
+static const CFStringEncoding kWideStringEncoding = kCFStringEncodingUTF16LE;
+#else  // __WCHAR_MAX__
+static const CFStringEncoding kWideStringEncoding = kCFStringEncodingUTF32LE;
+#endif  // __WCHAR_MAX__
+#endif  // __BIG_ENDIAN__
+
+}  // namespace
+
+// Do not assert in this function since it is used by the asssertion code!
+std::string SysWideToUTF8(const std::wstring& wide) {
+  return STLStringToSTLStringWithEncodingsT<std::string>(
+      wide, kWideStringEncoding, kNarrowStringEncoding);
+}
+
+// Do not assert in this function since it is used by the asssertion code!
+std::wstring SysUTF8ToWide(const std::string& utf8) {
+  return STLStringToSTLStringWithEncodingsT<std::wstring>(
+      utf8, kNarrowStringEncoding, kWideStringEncoding);
+}
+
+std::string SysWideToNativeMB(const std::wstring& wide) {
+  return WideToUTF8(wide);
+}
+
+std::wstring SysNativeMBToWide(const std::string& native_mb) {
+  return UTF8ToWide(native_mb);
+}
+
+}  // namespace base