From b17ec3ca11ed13cc0d984f6d8be112c246b1994d Mon Sep 17 00:00:00 2001
From: Feng Xiao <xfxyjwf@gmail.com>
Date: Sun, 23 Aug 2015 17:50:38 -0700
Subject: Down-integrate from internal code base.

---
 src/google/protobuf/wire_format_lite.cc | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(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 dade41af..847e3500 100644
--- a/src/google/protobuf/wire_format_lite.cc
+++ b/src/google/protobuf/wire_format_lite.cc
@@ -39,10 +39,12 @@
 #include <vector>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/stringprintf.h>
 #include <google/protobuf/io/coded_stream_inl.h>
 #include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl_lite.h>
 
+
 namespace google {
 namespace protobuf {
 namespace internal {
@@ -505,6 +507,35 @@ bool WireFormatLite::ReadBytes(io::CodedInputStream* input, string** p) {
   return ReadBytesToString(input, *p);
 }
 
+bool WireFormatLite::VerifyUtf8String(const char* data,
+                                      int size,
+                                      Operation op,
+                                      const char* field_name) {
+  if (!IsStructurallyValidUTF8(data, size)) {
+    const char* operation_str = NULL;
+    switch (op) {
+      case PARSE:
+        operation_str = "parsing";
+        break;
+      case SERIALIZE:
+        operation_str = "serializing";
+        break;
+      // no default case: have the compiler warn if a case is not covered.
+    }
+    string quoted_field_name = "";
+    if (field_name != NULL) {
+      quoted_field_name = StringPrintf(" '%s'", field_name);
+    }
+    // no space below to avoid double space when the field name is missing.
+    GOOGLE_LOG(ERROR) << "String field" << quoted_field_name << " contains invalid "
+               << "UTF-8 data when " << operation_str << " a protocol "
+               << "buffer. Use the 'bytes' type if you intend to send raw "
+               << "bytes. ";
+    return false;
+  }
+  return true;
+}
+
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
-- 
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