From d36c0c538a545fac5d9db6ba65c525246d4efa95 Mon Sep 17 00:00:00 2001
From: Feng Xiao <xfxyjwf@gmail.com>
Date: Wed, 29 Mar 2017 14:32:48 -0700
Subject: Down-integrate from google3.

---
 src/google/protobuf/wire_format_lite.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/google/protobuf/wire_format_lite.cc')

diff --git a/src/google/protobuf/wire_format_lite.cc b/src/google/protobuf/wire_format_lite.cc
index e46ac400..3b139e37 100644
--- a/src/google/protobuf/wire_format_lite.cc
+++ b/src/google/protobuf/wire_format_lite.cc
@@ -47,8 +47,8 @@
 #include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl_lite.h>
 
-
 namespace google {
+
 namespace protobuf {
 namespace internal {
 
@@ -123,6 +123,8 @@ WireFormatLite::kWireTypeForFieldType[MAX_FIELD_TYPE + 1] = {
 
 bool WireFormatLite::SkipField(
     io::CodedInputStream* input, uint32 tag) {
+  // Field number 0 is illegal.
+  if (WireFormatLite::GetTagFieldNumber(tag) == 0) return false;
   switch (WireFormatLite::GetTagWireType(tag)) {
     case WireFormatLite::WIRETYPE_VARINT: {
       uint64 value;
@@ -168,6 +170,8 @@ bool WireFormatLite::SkipField(
 
 bool WireFormatLite::SkipField(
     io::CodedInputStream* input, uint32 tag, io::CodedOutputStream* output) {
+  // Field number 0 is illegal.
+  if (WireFormatLite::GetTagFieldNumber(tag) == 0) return false;
   switch (WireFormatLite::GetTagWireType(tag)) {
     case WireFormatLite::WIRETYPE_VARINT: {
       uint64 value;
@@ -340,6 +344,8 @@ bool WireFormatLite::ReadPackedEnumPreserveUnknowns(
   return true;
 }
 
+#if !defined(PROTOBUF_LITTLE_ENDIAN)
+
 namespace {
 void EncodeFixedSizeValue(float v, uint8* dest) {
   WireFormatLite::WriteFloatNoTagToArray(v, dest);
@@ -370,6 +376,8 @@ void EncodeFixedSizeValue(bool v, uint8* dest) {
 }
 }  // anonymous namespace
 
+#endif  // !defined(PROTOBUF_LITTLE_ENDIAN)
+
 template <typename CType>
 static void WriteArray(const CType* a, int n, io::CodedOutputStream* output) {
 #if defined(PROTOBUF_LITTLE_ENDIAN)
-- 
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