Implement FakeFileAccess.

Update embedder tests to simulate unavailable data and download requests.

Change-Id: I634fa89d2a0c859243e849752936da87568909f4
Reviewed-on: https://pdfium-review.googlesource.com/11890
Commit-Queue: Art Snake <art-snake@yandex-team.ru>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 25 insertions, 47 deletions

diff --git a/fpdfsdk/fpdf_dataavail_embeddertest.cpp b/fpdfsdk/fpdf_dataavail_embeddertest.cpp
index c40f8579b6..2084153852 100644
--- a/fpdfsdk/fpdf_dataavail_embeddertest.cpp
+++ b/fpdfsdk/fpdf_dataavail_embeddertest.cpp
@@ -12,10 +12,25 @@
 #include "public/fpdfview.h"
 #include "testing/embedder_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "testing/range_set.h"
 #include "testing/test_support.h"
 #include "testing/utils/path_service.h"
 
 namespace {
+
+class MockDownloadHints : public FX_DOWNLOADHINTS {
+ public:
+  static void SAddSegment(FX_DOWNLOADHINTS* pThis, size_t offset, size_t size) {
+  }
+
+  MockDownloadHints() {
+    FX_DOWNLOADHINTS::version = 1;
+    FX_DOWNLOADHINTS::AddSegment = SAddSegment;
+  }
+
+  ~MockDownloadHints() {}
+};
+
 class TestAsyncLoader : public FX_DOWNLOADHINTS, FX_FILEAVAIL {
  public:
   explicit TestAsyncLoader(const std::string& file_name) {
@@ -60,7 +75,9 @@ class TestAsyncLoader : public FX_DOWNLOADHINTS, FX_FILEAVAIL {
   }
 
   size_t max_already_available_bound() const {
-    return available_ranges_.empty() ? 0 : available_ranges_.rbegin()->second;
+    return available_ranges_.IsEmpty()
+               ? 0
+               : available_ranges_.ranges().rbegin()->second;
   }
 
   void FlushRequestedData() {
@@ -72,45 +89,11 @@ class TestAsyncLoader : public FX_DOWNLOADHINTS, FX_FILEAVAIL {
 
  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));
+    available_ranges_.Union(RangeSet::Range(start, start + size));
   }
 
   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;
+    return available_ranges_.Contains(RangeSet::Range(start, start + size));
   }
 
   int GetBlockImpl(unsigned long pos, unsigned char* pBuf, unsigned long size) {
@@ -165,14 +148,7 @@ class TestAsyncLoader : public FX_DOWNLOADHINTS, FX_FILEAVAIL {
   size_t max_requested_bound_ = 0;
   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_;
+  RangeSet available_ranges_;
 };
 
 }  // namespace
@@ -182,13 +158,15 @@ 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_));
+  MockDownloadHints hints;
+  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_));
+  MockDownloadHints hints;
+  EXPECT_FALSE(FPDFAvail_IsDocAvail(avail_, &hints));
 }
 
 TEST_F(FPDFDataAvailEmbeddertest, LoadUsingHintTables) {