Add API for getting page labels.

fpdfsdk/fpdfdoc_embeddertest.cpp

Index: fpdfsdk/fpdfdoc_embeddertest.cpp
diff --git a/fpdfsdk/fpdfdoc_embeddertest.cpp b/fpdfsdk/fpdfdoc_embeddertest.cpp
index d7f1f971174841f849348470c72ee9abcc94f917..67934c5626b6daeaaa009322b45af763213b9a74 100644
--- a/fpdfsdk/fpdfdoc_embeddertest.cpp
+++ b/fpdfsdk/fpdfdoc_embeddertest.cpp
@@ -172,3 +172,57 @@ TEST_F(FPDFDocEmbeddertest, DeletePage) {
   FPDFPage_Delete(document(), 0);
   EXPECT_EQ(0, FPDF_GetPageCount(document()));
 }
+
+TEST_F(FPDFDocEmbeddertest, NoPageLabels) {
+  EXPECT_TRUE(OpenDocument("about_blank.pdf"));
+  EXPECT_EQ(1, FPDF_GetPageCount(document()));
+
+  ASSERT_EQ(0u, FPDF_GetPagelLabel(document(), 0, nullptr, 0));
+}
+
+TEST_F(FPDFDocEmbeddertest, GetPageLabels) {
+  EXPECT_TRUE(OpenDocument("page_labels.pdf"));

[Lei Zhang, 2016/11/23 01:53:42]

Created in Acrobat.

+  EXPECT_EQ(7, FPDF_GetPageCount(document()));
+
+  unsigned short buf[128];
+  EXPECT_EQ(0u, FPDF_GetPagelLabel(document(), -2, buf, sizeof(buf)));
+  EXPECT_EQ(0u, FPDF_GetPagelLabel(document(), -1, buf, sizeof(buf)));
+
+  const FX_WCHAR kExpectedPageLabel0[] = L"i";
+  ASSERT_EQ(4u, FPDF_GetPagelLabel(document(), 0, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel0),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel0)));
+
+  const FX_WCHAR kExpectedPageLabel1[] = L"ii";
+  ASSERT_EQ(6u, FPDF_GetPagelLabel(document(), 1, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel1),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel1)));
+
+  const FX_WCHAR kExpectedPageLabel2[] = L"1";
+  ASSERT_EQ(4u, FPDF_GetPagelLabel(document(), 2, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel2),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel2)));
+
+  const FX_WCHAR kExpectedPageLabel3[] = L"2";
+  ASSERT_EQ(4u, FPDF_GetPagelLabel(document(), 3, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel3),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel3)));
+
+  const FX_WCHAR kExpectedPageLabel4[] = L"zzA";
+  ASSERT_EQ(8u, FPDF_GetPagelLabel(document(), 4, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel4),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel4)));
+
+  const FX_WCHAR kExpectedPageLabel5[] = L"zzB";
+  ASSERT_EQ(8u, FPDF_GetPagelLabel(document(), 5, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel5),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel5)));
+
+  const FX_WCHAR kExpectedPageLabel6[] = L"";
+  ASSERT_EQ(2u, FPDF_GetPagelLabel(document(), 6, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(kExpectedPageLabel6),
+            CFX_WideString::FromUTF16LE(buf, FXSYS_len(kExpectedPageLabel6)));
+
+  ASSERT_EQ(0u, FPDF_GetPagelLabel(document(), 7, buf, sizeof(buf)));
+  ASSERT_EQ(0u, FPDF_GetPagelLabel(document(), 8, buf, sizeof(buf)));
+}