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// 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 <algorithm>
#include <memory>
#include <string>
#include <vector>
#include "public/fpdfview.h"
#include "testing/embedder_test.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/test_support.h"
#include "testing/utils/path_service.h"
namespace {
class TestAsyncLoader : public FX_DOWNLOADHINTS, FX_FILEAVAIL {
public:
TestAsyncLoader(const std::string& file_name) {
std::string file_path;
if (!PathService::GetTestFilePath(file_name, &file_path))
return;
file_contents_ = GetFileContents(file_path.c_str(), &file_length_);
if (!file_contents_)
return;
file_access_.m_FileLen = static_cast<unsigned long>(file_length_);
file_access_.m_GetBlock = SGetBlock;
file_access_.m_Param = this;
FX_DOWNLOADHINTS::version = 1;
FX_DOWNLOADHINTS::AddSegment = SAddSegment;
FX_FILEAVAIL::version = 1;
FX_FILEAVAIL::IsDataAvail = SIsDataAvail;
}
bool IsOpened() const { return !!file_contents_; }
FPDF_FILEACCESS* file_access() { return &file_access_; }
FX_DOWNLOADHINTS* hints() { return this; }
FX_FILEAVAIL* file_avail() { return this; }
const std::vector<std::pair<size_t, size_t>>& requested_segments() const {
return requested_segments_;
}
void ClearRequestedSegments() { requested_segments_.clear(); }
bool is_new_data_available() const { return is_new_data_available_; }
void set_is_new_data_available(bool is_new_data_available) {
is_new_data_available_ = is_new_data_available;
}
private:
void SetDataAvailable(size_t start, size_t size) {
if (size == 0)
return;
const auto range = std::make_pair(start, start + size);
if (available_ranges_.empty()) {
available_ranges_.insert(range);
return;
}
auto start_it = available_ranges_.upper_bound(range);
if (start_it != available_ranges_.begin())
--start_it; // start now points to the key equal or lower than offset.
if (start_it->second < range.first)
++start_it; // start element is entirely before current range, skip it.
auto end_it = available_ranges_.upper_bound(
std::make_pair(range.second, range.second));
if (start_it == end_it) { // No ranges to merge.
available_ranges_.insert(range);
return;
}
--end_it;
size_t new_start = std::min<size_t>(start_it->first, range.first);
size_t new_end = std::max(end_it->second, range.second);
available_ranges_.erase(start_it, ++end_it);
available_ranges_.insert(std::make_pair(new_start, new_end));
}
bool CheckDataAlreadyAvailable(size_t start, size_t size) const {
if (size == 0)
return false;
const auto range = std::make_pair(start, start + size);
auto it = available_ranges_.upper_bound(range);
if (it == available_ranges_.begin())
return false; // No ranges includes range.start().
--it; // Now it starts equal or before range.start().
return it->second >= range.second;
}
int GetBlockImpl(unsigned long pos, unsigned char* pBuf, unsigned long size) {
if (!IsDataAvailImpl(pos, size))
return 0;
const unsigned long end =
std::min(static_cast<unsigned long>(file_length_), pos + size);
if (end <= pos)
return 0;
memcpy(pBuf, file_contents_.get() + pos, end - pos);
SetDataAvailable(pos, end - pos);
return static_cast<int>(end - pos);
}
void AddSegmentImpl(size_t offset, size_t size) {
requested_segments_.push_back(std::make_pair(offset, size));
}
bool IsDataAvailImpl(size_t offset, size_t size) {
if (offset + size > file_length_)
return false;
if (is_new_data_available_) {
SetDataAvailable(offset, size);
return true;
}
return CheckDataAlreadyAvailable(offset, size);
}
static int SGetBlock(void* param,
unsigned long pos,
unsigned char* pBuf,
unsigned long size) {
return static_cast<TestAsyncLoader*>(param)->GetBlockImpl(pos, pBuf, size);
}
static void SAddSegment(FX_DOWNLOADHINTS* pThis, size_t offset, size_t size) {
return static_cast<TestAsyncLoader*>(pThis)->AddSegmentImpl(offset, size);
}
static FPDF_BOOL SIsDataAvail(FX_FILEAVAIL* pThis,
size_t offset,
size_t size) {
return static_cast<TestAsyncLoader*>(pThis)->IsDataAvailImpl(offset, size);
}
FPDF_FILEACCESS file_access_;
std::unique_ptr<char, pdfium::FreeDeleter> file_contents_;
size_t file_length_;
std::vector<std::pair<size_t, size_t>> requested_segments_;
bool is_new_data_available_ = true;
using Range = std::pair<size_t, size_t>;
struct range_compare {
bool operator()(const Range& lval, const Range& rval) const {
return lval.first < rval.first;
}
};
using RangesContainer = std::set<Range, range_compare>;
RangesContainer available_ranges_;
};
} // namespace
class FPDFDataAvailEmbeddertest : public EmbedderTest {};
TEST_F(FPDFDataAvailEmbeddertest, TrailerUnterminated) {
// Document must load without crashing but is too malformed to be available.
EXPECT_FALSE(OpenDocument("trailer_unterminated.pdf"));
EXPECT_FALSE(FPDFAvail_IsDocAvail(avail_, &hints_));
}
TEST_F(FPDFDataAvailEmbeddertest, TrailerAsHexstring) {
// Document must load without crashing but is too malformed to be available.
EXPECT_FALSE(OpenDocument("trailer_as_hexstring.pdf"));
EXPECT_FALSE(FPDFAvail_IsDocAvail(avail_, &hints_));
}
TEST_F(FPDFDataAvailEmbeddertest, LoadUsingHintTables) {
TestAsyncLoader loader("feature_linearized_loading.pdf");
avail_ = FPDFAvail_Create(loader.file_avail(), loader.file_access());
ASSERT_EQ(PDF_DATA_AVAIL, FPDFAvail_IsDocAvail(avail_, loader.hints()));
document_ = FPDFAvail_GetDocument(avail_, nullptr);
ASSERT_TRUE(document_);
ASSERT_EQ(PDF_DATA_AVAIL, FPDFAvail_IsPageAvail(avail_, 1, loader.hints()));
// No new data available, to prevent load "Pages" node.
loader.set_is_new_data_available(false);
FPDF_PAGE page = LoadPage(1);
EXPECT_TRUE(page);
UnloadPage(page);
}
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