Reland "Cleanup some numeric code.""chromium/2567

This reverts commit 0569ab0b11b723d9bca4ddd642b0cf8828c4bdd1.

This changes the various comparisons of char >= '0' && char <= '9' and
char < '0' || char > '9' to use std::isdigit checks. It also cleans up
a handful of hex to digit conversions to call one common method.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1449873003 .

1 files changed, 24 insertions, 0 deletions

diff --git a/core/src/fxcrt/fx_extension_unittest.cpp b/core/src/fxcrt/fx_extension_unittest.cpp
new file mode 100644
index 0000000000..b12dcbe07f
--- /dev/null
+++ b/core/src/fxcrt/fx_extension_unittest.cpp
@@ -0,0 +1,24 @@
+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "core/include/fxcrt/fx_ext.h"
+
+TEST(fxcrt, FXSYS_toHexDigit) {
+  EXPECT_EQ(10, FXSYS_toHexDigit('a'));
+  EXPECT_EQ(10, FXSYS_toHexDigit('A'));
+  EXPECT_EQ(7, FXSYS_toHexDigit('7'));
+  EXPECT_EQ(0, FXSYS_toHexDigit('i'));
+}
+
+TEST(fxcrt, FXSYS_toDecimalDigit) {
+  EXPECT_EQ(7, FXSYS_toDecimalDigit('7'));
+  EXPECT_EQ(0, FXSYS_toDecimalDigit('a'));
+}
+
+TEST(fxcrt, FXSYS_toDecimalDigitWide) {
+  EXPECT_EQ(7, FXSYS_toDecimalDigitWide(L'7'));
+  EXPECT_EQ(0, FXSYS_toDecimalDigitWide(L'a'));
+}