Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_helpers.cc

Index: third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_helpers.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_helpers.cc b/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_helpers.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c51fe44b391ec1cd4f8de654a9bdefb653d8a75c
--- /dev/null
+++ b/third_party/protobuf/src/google/protobuf/compiler/csharp/csharp_helpers.cc
@@ -0,0 +1,405 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <algorithm>
+#include <google/protobuf/stubs/hash.h>
+#include <limits>
+#include <vector>
+
+#include <google/protobuf/compiler/csharp/csharp_helpers.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/wire_format.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/substitute.h>
+
+#include <google/protobuf/compiler/csharp/csharp_field_base.h>
+#include <google/protobuf/compiler/csharp/csharp_enum_field.h>
+#include <google/protobuf/compiler/csharp/csharp_map_field.h>
+#include <google/protobuf/compiler/csharp/csharp_message_field.h>
+#include <google/protobuf/compiler/csharp/csharp_primitive_field.h>
+#include <google/protobuf/compiler/csharp/csharp_repeated_enum_field.h>
+#include <google/protobuf/compiler/csharp/csharp_repeated_message_field.h>
+#include <google/protobuf/compiler/csharp/csharp_repeated_primitive_field.h>
+#include <google/protobuf/compiler/csharp/csharp_wrapper_field.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace csharp {
+
+CSharpType GetCSharpType(FieldDescriptor::Type type) {
+  switch (type) {
+    case FieldDescriptor::TYPE_INT32:
+      return CSHARPTYPE_INT32;
+    case FieldDescriptor::TYPE_INT64:
+      return CSHARPTYPE_INT64;
+    case FieldDescriptor::TYPE_UINT32:
+      return CSHARPTYPE_UINT32;
+    case FieldDescriptor::TYPE_UINT64:
+      return CSHARPTYPE_UINT32;
+    case FieldDescriptor::TYPE_SINT32:
+      return CSHARPTYPE_INT32;
+    case FieldDescriptor::TYPE_SINT64:
+      return CSHARPTYPE_INT64;
+    case FieldDescriptor::TYPE_FIXED32:
+      return CSHARPTYPE_UINT32;
+    case FieldDescriptor::TYPE_FIXED64:
+      return CSHARPTYPE_UINT64;
+    case FieldDescriptor::TYPE_SFIXED32:
+      return CSHARPTYPE_INT32;
+    case FieldDescriptor::TYPE_SFIXED64:
+      return CSHARPTYPE_INT64;
+    case FieldDescriptor::TYPE_FLOAT:
+      return CSHARPTYPE_FLOAT;
+    case FieldDescriptor::TYPE_DOUBLE:
+      return CSHARPTYPE_DOUBLE;
+    case FieldDescriptor::TYPE_BOOL:
+      return CSHARPTYPE_BOOL;
+    case FieldDescriptor::TYPE_ENUM:
+      return CSHARPTYPE_ENUM;
+    case FieldDescriptor::TYPE_STRING:
+      return CSHARPTYPE_STRING;
+    case FieldDescriptor::TYPE_BYTES:
+      return CSHARPTYPE_BYTESTRING;
+    case FieldDescriptor::TYPE_GROUP:
+      return CSHARPTYPE_MESSAGE;
+    case FieldDescriptor::TYPE_MESSAGE:
+      return CSHARPTYPE_MESSAGE;
+
+      // No default because we want the compiler to complain if any new
+      // types are added.
+  }
+  GOOGLE_LOG(FATAL)<< "Can't get here.";
+  return (CSharpType) -1;
+}
+
+std::string StripDotProto(const std::string& proto_file) {
+  int lastindex = proto_file.find_last_of(".");
+  return proto_file.substr(0, lastindex);
+}
+
+std::string GetFileNamespace(const FileDescriptor* descriptor) {
+  if (descriptor->options().has_csharp_namespace()) {
+    return descriptor->options().csharp_namespace();
+  }
+  return UnderscoresToCamelCase(descriptor->package(), true, true);
+}
+
+// Returns the Pascal-cased last part of the proto file. For example,
+// input of "google/protobuf/foo_bar.proto" would result in "FooBar".
+std::string GetFileNameBase(const FileDescriptor* descriptor) {
+    std::string proto_file = descriptor->name();
+    int lastslash = proto_file.find_last_of("/");
+    std::string base = proto_file.substr(lastslash + 1);
+    return UnderscoresToPascalCase(StripDotProto(base));
+}
+
+std::string GetReflectionClassUnqualifiedName(const FileDescriptor* descriptor) {
+  // TODO: Detect collisions with existing messages, and append an underscore if necessary.
+  return GetFileNameBase(descriptor) + "Reflection";
+}
+
+// TODO(jtattermusch): can we reuse a utility function?
+std::string UnderscoresToCamelCase(const std::string& input,
+                                   bool cap_next_letter,
+                                   bool preserve_period) {
+  string result;
+  // Note:  I distrust ctype.h due to locales.
+  for (int i = 0; i < input.size(); i++) {
+    if ('a' <= input[i] && input[i] <= 'z') {
+      if (cap_next_letter) {
+        result += input[i] + ('A' - 'a');
+      } else {
+        result += input[i];
+      }
+      cap_next_letter = false;
+    } else if ('A' <= input[i] && input[i] <= 'Z') {
+      if (i == 0 && !cap_next_letter) {
+        // Force first letter to lower-case unless explicitly told to
+        // capitalize it.
+        result += input[i] + ('a' - 'A');
+      } else {
+        // Capital letters after the first are left as-is.
+        result += input[i];
+      }
+      cap_next_letter = false;
+    } else if ('0' <= input[i] && input[i] <= '9') {
+      result += input[i];
+      cap_next_letter = true;
+    } else {
+      cap_next_letter = true;
+      if (input[i] == '.' && preserve_period) {
+        result += '.';
+      }
+    }
+  }
+  // Add a trailing "_" if the name should be altered.
+  if (input[input.size() - 1] == '#') {
+    result += '_';
+  }
+  return result;
+}
+
+std::string UnderscoresToPascalCase(const std::string& input) {
+  return UnderscoresToCamelCase(input, true);
+}
+
+std::string ToCSharpName(const std::string& name, const FileDescriptor* file) {
+  std::string result = GetFileNamespace(file);
+  if (result != "") {
+    result += '.';
+  }
+  string classname;
+  if (file->package().empty()) {
+    classname = name;
+  } else {
+    // Strip the proto package from full_name since we've replaced it with
+    // the C# namespace.
+    classname = name.substr(file->package().size() + 1);
+  }
+  result += StringReplace(classname, ".", ".Types.", true);
+  return "global::" + result;
+}
+
+std::string GetReflectionClassName(const FileDescriptor* descriptor) {
+  std::string result = GetFileNamespace(descriptor);
+  if (!result.empty()) {
+    result += '.';
+  }
+  result += GetReflectionClassUnqualifiedName(descriptor);
+  return "global::" + result;
+}
+
+std::string GetClassName(const Descriptor* descriptor) {
+  return ToCSharpName(descriptor->full_name(), descriptor->file());
+}
+
+std::string GetClassName(const EnumDescriptor* descriptor) {
+  return ToCSharpName(descriptor->full_name(), descriptor->file());
+}
+
+// Groups are hacky:  The name of the field is just the lower-cased name
+// of the group type.  In C#, though, we would like to retain the original
+// capitalization of the type name.
+std::string GetFieldName(const FieldDescriptor* descriptor) {
+  if (descriptor->type() == FieldDescriptor::TYPE_GROUP) {
+    return descriptor->message_type()->name();
+  } else {
+    return descriptor->name();
+  }
+}
+
+std::string GetFieldConstantName(const FieldDescriptor* field) {
+  return GetPropertyName(field) + "FieldNumber";
+}
+
+std::string GetPropertyName(const FieldDescriptor* descriptor) {
+  // TODO(jtattermusch): consider introducing csharp_property_name field option
+  std::string property_name = UnderscoresToPascalCase(GetFieldName(descriptor));
+  // Avoid either our own type name or reserved names. Note that not all names
+  // are reserved - a field called to_string, write_to etc would still cause a problem.
+  // There are various ways of ending up with naming collisions, but we try to avoid obvious
+  // ones.
+  if (property_name == descriptor->containing_type()->name()
+      || property_name == "Types"
+      || property_name == "Descriptor") {
+    property_name += "_";
+  }
+  return property_name;
+}
+
+std::string GetOutputFile(
+    const google::protobuf::FileDescriptor* descriptor,
+    const std::string file_extension,
+    const bool generate_directories,
+    const std::string base_namespace,
+    string* error) {
+  string relative_filename = GetFileNameBase(descriptor) + file_extension;
+  if (!generate_directories) {
+    return relative_filename;
+  }
+  string ns = GetFileNamespace(descriptor);
+  string namespace_suffix = ns;
+  if (!base_namespace.empty()) {
+    // Check that the base_namespace is either equal to or a leading part of
+    // the file namespace. This isn't just a simple prefix; "Foo.B" shouldn't
+    // be regarded as a prefix of "Foo.Bar". The simplest option is to add "."
+    // to both.
+    string extended_ns = ns + ".";
+    if (extended_ns.find(base_namespace + ".") != 0) {
+      *error = "Namespace " + ns + " is not a prefix namespace of base namespace " + base_namespace;
+      return ""; // This will be ignored, because we've set an error.
+    }
+    namespace_suffix = ns.substr(base_namespace.length());
+    if (namespace_suffix.find(".") == 0) {
+      namespace_suffix = namespace_suffix.substr(1);
+    }
+  }
+
+  string namespace_dir = StringReplace(namespace_suffix, ".", "/", true);
+  if (!namespace_dir.empty()) {
+    namespace_dir += "/";
+  }
+  return namespace_dir + relative_filename;
+}
+
+// TODO: c&p from Java protoc plugin
+// For encodings with fixed sizes, returns that size in bytes.  Otherwise
+// returns -1.
+int GetFixedSize(FieldDescriptor::Type type) {
+  switch (type) {
+    case FieldDescriptor::TYPE_INT32   : return -1;
+    case FieldDescriptor::TYPE_INT64   : return -1;
+    case FieldDescriptor::TYPE_UINT32  : return -1;
+    case FieldDescriptor::TYPE_UINT64  : return -1;
+    case FieldDescriptor::TYPE_SINT32  : return -1;
+    case FieldDescriptor::TYPE_SINT64  : return -1;
+    case FieldDescriptor::TYPE_FIXED32 : return internal::WireFormatLite::kFixed32Size;
+    case FieldDescriptor::TYPE_FIXED64 : return internal::WireFormatLite::kFixed64Size;
+    case FieldDescriptor::TYPE_SFIXED32: return internal::WireFormatLite::kSFixed32Size;
+    case FieldDescriptor::TYPE_SFIXED64: return internal::WireFormatLite::kSFixed64Size;
+    case FieldDescriptor::TYPE_FLOAT   : return internal::WireFormatLite::kFloatSize;
+    case FieldDescriptor::TYPE_DOUBLE  : return internal::WireFormatLite::kDoubleSize;
+
+    case FieldDescriptor::TYPE_BOOL    : return internal::WireFormatLite::kBoolSize;
+    case FieldDescriptor::TYPE_ENUM    : return -1;
+
+    case FieldDescriptor::TYPE_STRING  : return -1;
+    case FieldDescriptor::TYPE_BYTES   : return -1;
+    case FieldDescriptor::TYPE_GROUP   : return -1;
+    case FieldDescriptor::TYPE_MESSAGE : return -1;
+
+    // No default because we want the compiler to complain if any new
+    // types are added.
+  }
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return -1;
+}
+
+static const char base64_chars[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+std::string StringToBase64(const std::string& input) {
+  std::string result;
+  size_t remaining = input.size();
+  const unsigned char *src = (const unsigned char*) input.c_str();
+  while (remaining > 2) {
+    result += base64_chars[src[0] >> 2];
+    result += base64_chars[((src[0] & 0x3) << 4) | (src[1] >> 4)];
+    result += base64_chars[((src[1] & 0xf) << 2) | (src[2] >> 6)];
+    result += base64_chars[src[2] & 0x3f];
+    remaining -= 3;
+    src += 3;
+  }
+  switch (remaining) {
+    case 2:
+      result += base64_chars[src[0] >> 2];
+      result += base64_chars[((src[0] & 0x3) << 4) | (src[1] >> 4)];
+      result += base64_chars[(src[1] & 0xf) << 2];
+      result += '=';
+      src += 2;
+      break;
+    case 1:
+      result += base64_chars[src[0] >> 2];
+      result += base64_chars[((src[0] & 0x3) << 4)];
+      result += '=';
+      result += '=';
+      src += 1;
+      break;
+  }
+  return result;
+}
+
+std::string FileDescriptorToBase64(const FileDescriptor* descriptor) {
+  std::string fdp_bytes;
+  FileDescriptorProto fdp;
+  descriptor->CopyTo(&fdp);
+  fdp.SerializeToString(&fdp_bytes);
+  return StringToBase64(fdp_bytes);
+}
+
+FieldGeneratorBase* CreateFieldGenerator(const FieldDescriptor* descriptor,
+                                         int fieldOrdinal) {
+  switch (descriptor->type()) {
+    case FieldDescriptor::TYPE_GROUP:
+    case FieldDescriptor::TYPE_MESSAGE:
+      if (descriptor->is_repeated()) {
+        if (descriptor->is_map()) {
+          return new MapFieldGenerator(descriptor, fieldOrdinal);
+        } else {
+          return new RepeatedMessageFieldGenerator(descriptor, fieldOrdinal);
+        }
+      } else {
+        if (IsWrapperType(descriptor)) {
+          if (descriptor->containing_oneof()) {
+            return new WrapperOneofFieldGenerator(descriptor, fieldOrdinal);
+          } else {
+            return new WrapperFieldGenerator(descriptor, fieldOrdinal);
+          }
+        } else {
+          if (descriptor->containing_oneof()) {
+            return new MessageOneofFieldGenerator(descriptor, fieldOrdinal);
+          } else {
+            return new MessageFieldGenerator(descriptor, fieldOrdinal);
+          }
+        }
+      }
+    case FieldDescriptor::TYPE_ENUM:
+      if (descriptor->is_repeated()) {
+        return new RepeatedEnumFieldGenerator(descriptor, fieldOrdinal);
+      } else {
+        if (descriptor->containing_oneof()) {
+          return new EnumOneofFieldGenerator(descriptor, fieldOrdinal);
+        } else {
+          return new EnumFieldGenerator(descriptor, fieldOrdinal);
+        }
+      }
+    default:
+      if (descriptor->is_repeated()) {
+        return new RepeatedPrimitiveFieldGenerator(descriptor, fieldOrdinal);
+      } else {
+        if (descriptor->containing_oneof()) {
+          return new PrimitiveOneofFieldGenerator(descriptor, fieldOrdinal);
+        } else {
+          return new PrimitiveFieldGenerator(descriptor, fieldOrdinal);
+        }
+      }
+  }
+}
+
+}  // namespace csharp
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google