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// Copyright 2016 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 "core/fxcrt/fx_string.h"
#include "public/fpdf_structtree.h"
#include "testing/embedder_test.h"
#include "testing/test_support.h"
class FPDFStructTreeEmbeddertest : public EmbedderTest, public TestSaver {};
TEST_F(FPDFStructTreeEmbeddertest, GetAltText) {
ASSERT_TRUE(OpenDocument("tagged_alt_text.pdf"));
FPDF_PAGE page = LoadPage(0);
ASSERT_TRUE(page);
FPDF_STRUCTTREE struct_tree = FPDF_StructTree_GetForPage(page);
ASSERT_TRUE(struct_tree);
ASSERT_EQ(1, FPDF_StructTree_CountChildren(struct_tree));
FPDF_STRUCTELEMENT element = FPDF_StructTree_GetChildAtIndex(struct_tree, -1);
EXPECT_EQ(nullptr, element);
element = FPDF_StructTree_GetChildAtIndex(struct_tree, 1);
EXPECT_EQ(nullptr, element);
element = FPDF_StructTree_GetChildAtIndex(struct_tree, 0);
ASSERT_NE(nullptr, element);
EXPECT_EQ(0U, FPDF_StructElement_GetAltText(element, nullptr, 0));
ASSERT_EQ(1, FPDF_StructElement_CountChildren(element));
FPDF_STRUCTELEMENT child_element =
FPDF_StructElement_GetChildAtIndex(element, -1);
EXPECT_EQ(nullptr, child_element);
child_element = FPDF_StructElement_GetChildAtIndex(element, 1);
EXPECT_EQ(nullptr, child_element);
child_element = FPDF_StructElement_GetChildAtIndex(element, 0);
ASSERT_NE(nullptr, child_element);
EXPECT_EQ(0U, FPDF_StructElement_GetAltText(child_element, nullptr, 0));
ASSERT_EQ(1, FPDF_StructElement_CountChildren(child_element));
FPDF_STRUCTELEMENT gchild_element =
FPDF_StructElement_GetChildAtIndex(child_element, -1);
EXPECT_EQ(nullptr, gchild_element);
gchild_element = FPDF_StructElement_GetChildAtIndex(child_element, 1);
EXPECT_EQ(nullptr, gchild_element);
gchild_element = FPDF_StructElement_GetChildAtIndex(child_element, 0);
ASSERT_NE(nullptr, gchild_element);
ASSERT_EQ(24U, FPDF_StructElement_GetAltText(gchild_element, nullptr, 0));
unsigned short buffer[12];
memset(buffer, 0, sizeof(buffer));
// Deliberately pass in a small buffer size to make sure |buffer| remains
// untouched.
ASSERT_EQ(24U, FPDF_StructElement_GetAltText(gchild_element, buffer, 1));
for (size_t i = 0; i < FX_ArraySize(buffer); ++i)
EXPECT_EQ(0U, buffer[i]);
ASSERT_EQ(24U, FPDF_StructElement_GetAltText(gchild_element, buffer,
sizeof(buffer)));
const FX_WCHAR kExpected[] = L"Black Image";
EXPECT_EQ(CFX_WideString(kExpected),
CFX_WideString::FromUTF16LE(buffer, FXSYS_len(kExpected)));
ASSERT_EQ(1, FPDF_StructElement_CountChildren(gchild_element));
FPDF_STRUCTELEMENT ggchild_element =
FPDF_StructElement_GetChildAtIndex(gchild_element, 0);
EXPECT_EQ(nullptr, ggchild_element);
FPDF_StructTree_Close(struct_tree);
FPDF_ClosePage(page);
}
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