Code change to avoid signed/unsigned mismatch warnings

fpdfsdk/fpdfdoc_embeddertest.cpp

 // 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 <string>
 
 #include "core/fxcrt/include/fx_string.h"
 #include "public/fpdf_doc.h"
 #include "public/fpdfview.h"
 #include "testing/embedder_test.h"
@@ skipping 54 matching lines @@
 
   FPDF_ClosePage(page);
 }
 
 TEST_F(FPDFDocEmbeddertest, NoBookmarks) {
   // Open a file with no bookmarks.
   EXPECT_TRUE(OpenDocument("named_dests.pdf"));
 
   // The non-existent top-level bookmark has no title.
   unsigned short buf[128];
-  EXPECT_EQ(0, FPDFBookmark_GetTitle(nullptr, buf, sizeof(buf)));
+  EXPECT_EQ(0u, FPDFBookmark_GetTitle(nullptr, buf, sizeof(buf)));
 
   // The non-existent top-level bookmark has no children.
   EXPECT_EQ(nullptr, FPDFBookmark_GetFirstChild(document(), nullptr));
 }
 
 TEST_F(FPDFDocEmbeddertest, Bookmarks) {
   // Open a file with two bookmarks.
   EXPECT_TRUE(OpenDocument("bookmarks.pdf"));
 
   // The existent top-level bookmark has no title.
   unsigned short buf[128];
-  EXPECT_EQ(0, FPDFBookmark_GetTitle(nullptr, buf, sizeof(buf)));
+  EXPECT_EQ(0u, FPDFBookmark_GetTitle(nullptr, buf, sizeof(buf)));
 
   FPDF_BOOKMARK child = FPDFBookmark_GetFirstChild(document(), nullptr);
   EXPECT_NE(nullptr, child);
-  EXPECT_EQ(34, FPDFBookmark_GetTitle(child, buf, sizeof(buf)));
+  EXPECT_EQ(34u, FPDFBookmark_GetTitle(child, buf, sizeof(buf)));
   EXPECT_EQ(CFX_WideString(L"A Good Beginning"),
             CFX_WideString::FromUTF16LE(buf, 16));
 
   EXPECT_EQ(nullptr, FPDFBookmark_GetFirstChild(document(), child));
 
   FPDF_BOOKMARK sibling = FPDFBookmark_GetNextSibling(document(), child);
   EXPECT_NE(nullptr, sibling);
-  EXPECT_EQ(28, FPDFBookmark_GetTitle(sibling, buf, sizeof(buf)));
+  EXPECT_EQ(28u, FPDFBookmark_GetTitle(sibling, buf, sizeof(buf)));
   EXPECT_EQ(CFX_WideString(L"A Good Ending"),
             CFX_WideString::FromUTF16LE(buf, 13));
 
   EXPECT_EQ(nullptr, FPDFBookmark_GetNextSibling(document(), sibling));
 }
 
 TEST_F(FPDFDocEmbeddertest, FindBookmarks) {
   // Open a file with two bookmarks.
   EXPECT_TRUE(OpenDocument("bookmarks.pdf"));
 
   // Find the first one, based on its known title.
   std::unique_ptr<unsigned short, pdfium::FreeDeleter> title =
       GetFPDFWideString(L"A Good Beginning");
   FPDF_BOOKMARK child = FPDFBookmark_Find(document(), title.get());
   EXPECT_NE(nullptr, child);
 
   // Check that the string matches.
   unsigned short buf[128];
-  EXPECT_EQ(34, FPDFBookmark_GetTitle(child, buf, sizeof(buf)));
+  EXPECT_EQ(34u, FPDFBookmark_GetTitle(child, buf, sizeof(buf)));
   EXPECT_EQ(CFX_WideString(L"A Good Beginning"),
             CFX_WideString::FromUTF16LE(buf, 16));
 
   // Check that it is them same as the one returned by GetFirstChild.
   EXPECT_EQ(child, FPDFBookmark_GetFirstChild(document(), nullptr));
 
   // Try to find one using a non-existent title.
   std::unique_ptr<unsigned short, pdfium::FreeDeleter> bad_title =
       GetFPDFWideString(L"A BAD Beginning");
   EXPECT_EQ(nullptr, FPDFBookmark_Find(document(), bad_title.get()));
 }
 
 // Check circular bookmarks will not cause infinite loop.
 TEST_F(FPDFDocEmbeddertest, FindBookmarks_bug420) {
   // Open a file with circular bookmarks.
   EXPECT_TRUE(OpenDocument("bookmarks_circular.pdf"));
 
   // Try to find a title.
   std::unique_ptr<unsigned short, pdfium::FreeDeleter> title =
       GetFPDFWideString(L"anything");
   EXPECT_EQ(nullptr, FPDFBookmark_Find(document(), title.get()));
 }