third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/src/google/protobuf/message_lite.h

Index: third_party/protobuf/src/google/protobuf/message_lite.h
diff --git a/third_party/protobuf/src/google/protobuf/message_lite.h b/third_party/protobuf/src/google/protobuf/message_lite.h
index 4c16f4c0572be88df0a702e8a5455d0ec78fc385..5e5ed306810a7b8ee758b37273b368cf06a14d03 100644
--- a/third_party/protobuf/src/google/protobuf/message_lite.h
+++ b/third_party/protobuf/src/google/protobuf/message_lite.h
@@ -39,7 +39,9 @@
 #ifndef GOOGLE_PROTOBUF_MESSAGE_LITE_H__
 #define GOOGLE_PROTOBUF_MESSAGE_LITE_H__
 
+#include <climits>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
 
 
 namespace google {
@@ -51,6 +53,9 @@ namespace io {
   class ZeroCopyInputStream;
   class ZeroCopyOutputStream;
 }
+namespace internal {
+  class WireFormatLite;
+}
 
 // Interface to light weight protocol messages.
 //
@@ -78,7 +83,7 @@ namespace io {
 class LIBPROTOBUF_EXPORT MessageLite {
  public:
   inline MessageLite() {}
-  virtual ~MessageLite();
+  virtual ~MessageLite() {}
 
   // Basic Operations ------------------------------------------------
 
@@ -236,23 +241,30 @@ class LIBPROTOBUF_EXPORT MessageLite {
   bool AppendPartialToString(string* output) const;
 
   // Computes the serialized size of the message.  This recursively calls
-  // ByteSize() on all embedded messages.  If a subclass does not override
-  // this, it MUST override SetCachedSize().
+  // ByteSizeLong() on all embedded messages.
   //
-  // ByteSize() is generally linear in the number of fields defined for the
+  // ByteSizeLong() is generally linear in the number of fields defined for the
   // proto.
-  virtual int ByteSize() const = 0;
-
-  // Serializes the message without recomputing the size.  The message must
-  // not have changed since the last call to ByteSize(); if it has, the results
-  // are undefined.
+  virtual size_t ByteSizeLong() const = 0;
+
+  // Legacy ByteSize() API.
+  int ByteSize() const {
+    size_t result = ByteSizeLong();
+    GOOGLE_DCHECK_LE(result, static_cast<size_t>(INT_MAX));
+    return static_cast<int>(result);
+  }
+
+  // Serializes the message without recomputing the size.  The message must not
+  // have changed since the last call to ByteSize(), and the value returned by
+  // ByteSize must be non-negative.  Otherwise the results are undefined.
   virtual void SerializeWithCachedSizes(
       io::CodedOutputStream* output) const = 0;
 
-  // Like SerializeWithCachedSizes, but writes directly to *target, returning
-  // a pointer to the byte immediately after the last byte written.  "target"
-  // must point at a byte array of at least ByteSize() bytes.
-  virtual uint8* SerializeWithCachedSizesToArray(uint8* target) const;
+  // A version of SerializeWithCachedSizesToArray, below, that does
+  // not guarantee deterministic serialization.
+  virtual uint8* SerializeWithCachedSizesToArray(uint8* target) const {
+    return InternalSerializeWithCachedSizesToArray(false, target);
+  }
 
   // Returns the result of the last call to ByteSize().  An embedded message's
   // size is needed both to serialize it (because embedded messages are
@@ -267,7 +279,22 @@ class LIBPROTOBUF_EXPORT MessageLite {
   // method.)
   virtual int GetCachedSize() const = 0;
 
+  // Functions below here are not part of the public interface.  It isn't
+  // enforced, but they should be treated as private, and will be private
+  // at some future time.  Unfortunately the implementation of the "friend"
+  // keyword in GCC is broken at the moment, but we expect it will be fixed.
+
+  // Like SerializeWithCachedSizes, but writes directly to *target, returning
+  // a pointer to the byte immediately after the last byte written.  "target"
+  // must point at a byte array of at least ByteSize() bytes.  If deterministic
+  // is true then we use deterministic serialization, e.g., map keys are sorted.
+  // FOR INTERNAL USE ONLY!
+  virtual uint8* InternalSerializeWithCachedSizesToArray(bool deterministic,
+                                                         uint8* target) const;
+
  private:
+  friend class internal::WireFormatLite;
+
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageLite);
 };