From e841bac4fcf47f809e089a70d5f84ac37b3883df Mon Sep 17 00:00:00 2001
From: Feng Xiao <xfxyjwf@gmail.com>
Date: Fri, 11 Dec 2015 17:09:20 -0800
Subject: Down-integrate from internal code base.

---
 src/google/protobuf/io/coded_stream.h        |  1 +
 src/google/protobuf/io/strtod.cc             | 11 +++++++++++
 src/google/protobuf/io/strtod.h              |  5 +++++
 src/google/protobuf/io/tokenizer.cc          |  2 +-
 src/google/protobuf/io/tokenizer_unittest.cc |  2 ++
 5 files changed, 20 insertions(+), 1 deletion(-)

(limited to 'src/google/protobuf/io')

diff --git a/src/google/protobuf/io/coded_stream.h b/src/google/protobuf/io/coded_stream.h
index cb1869a7..2da096c5 100644
--- a/src/google/protobuf/io/coded_stream.h
+++ b/src/google/protobuf/io/coded_stream.h
@@ -109,6 +109,7 @@
 #ifndef GOOGLE_PROTOBUF_IO_CODED_STREAM_H__
 #define GOOGLE_PROTOBUF_IO_CODED_STREAM_H__
 
+#include <assert.h>
 #include <string>
 #include <utility>
 #ifdef _MSC_VER
diff --git a/src/google/protobuf/io/strtod.cc b/src/google/protobuf/io/strtod.cc
index 579de9aa..a90bb9a3 100644
--- a/src/google/protobuf/io/strtod.cc
+++ b/src/google/protobuf/io/strtod.cc
@@ -32,6 +32,7 @@
 
 #include <cstdio>
 #include <cstring>
+#include <limits>
 #include <string>
 
 #include <google/protobuf/stubs/logging.h>
@@ -109,6 +110,16 @@ double NoLocaleStrtod(const char* text, char** original_endptr) {
   return result;
 }
 
+float SafeDoubleToFloat(double value) {
+  if (value > std::numeric_limits<float>::max()) {
+    return std::numeric_limits<float>::infinity();
+  } else if (value < -std::numeric_limits<float>::max()) {
+    return -std::numeric_limits<float>::infinity();
+  } else {
+    return static_cast<float>(value);
+  }
+}
+
 }  // namespace io
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/io/strtod.h b/src/google/protobuf/io/strtod.h
index c2efc8d3..f56e41c8 100644
--- a/src/google/protobuf/io/strtod.h
+++ b/src/google/protobuf/io/strtod.h
@@ -43,6 +43,11 @@ namespace io {
 // uses a dot as the decimal separator.
 double NoLocaleStrtod(const char* str, char** endptr);
 
+// Casts a double value to a float value. If the value is outside of the
+// representable range of float, it will be converted to positive or negative
+// infinity.
+float SafeDoubleToFloat(double value);
+
 }  // namespace io
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/io/tokenizer.cc b/src/google/protobuf/io/tokenizer.cc
index 7ccd633d..3d57707c 100644
--- a/src/google/protobuf/io/tokenizer.cc
+++ b/src/google/protobuf/io/tokenizer.cc
@@ -375,7 +375,7 @@ void Tokenizer::ConsumeString(char delimiter) {
           // Possibly followed by two more octal digits, but these will
           // just be consumed by the main loop anyway so we don't need
           // to do so explicitly here.
-        } else if (TryConsume('x') || TryConsume('X')) {
+        } else if (TryConsume('x')) {
           if (!TryConsumeOne<HexDigit>()) {
             AddError("Expected hex digits for escape sequence.");
           }
diff --git a/src/google/protobuf/io/tokenizer_unittest.cc b/src/google/protobuf/io/tokenizer_unittest.cc
index 6526056a..20d50a2c 100644
--- a/src/google/protobuf/io/tokenizer_unittest.cc
+++ b/src/google/protobuf/io/tokenizer_unittest.cc
@@ -875,6 +875,8 @@ ErrorCase kErrorCases[] = {
   // String errors.
   { "'\\l' foo", true,
     "0:2: Invalid escape sequence in string literal.\n" },
+  { "'\\X' foo", true,
+    "0:2: Invalid escape sequence in string literal.\n" },
   { "'\\x' foo", true,
     "0:3: Expected hex digits for escape sequence.\n" },
   { "'foo", false,
-- 
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