Implement read Session.

Helper for validate read problems locally,

Change-Id: I2bfbbaab8a67c0fd0cee3dadcd0f9cad5953101c
Reviewed-on: https://pdfium-review.googlesource.com/9552
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Art Snake <art-snake@yandex-team.ru>

1 files changed, 80 insertions, 0 deletions

diff --git a/core/fpdfapi/parser/cpdf_read_validator_unittest.cpp b/core/fpdfapi/parser/cpdf_read_validator_unittest.cpp
index f0e47f552c..cb6c07ecb6 100644
--- a/core/fpdfapi/parser/cpdf_read_validator_unittest.cpp
+++ b/core/fpdfapi/parser/cpdf_read_validator_unittest.cpp
@@ -178,3 +178,83 @@ TEST(CPDF_ReadValidatorTest, IntOverflow) {
   EXPECT_FALSE(validator->read_error());
   EXPECT_FALSE(validator->has_unavailable_data());
 }
+
+TEST(CPDF_ReadValidatorTest, Session) {
+  std::vector<uint8_t> test_data(kTestDataSize);
+
+  auto file = pdfium::MakeRetain<InvalidReader>();
+  MockFileAvail file_avail;
+  MockDownloadHints hints;
+  auto validator = pdfium::MakeRetain<CPDF_ReadValidator>(file, &file_avail);
+  validator->SetDownloadHints(&hints);
+
+  const CPDF_ReadValidator::Session read_session(validator.Get());
+  ASSERT_FALSE(validator->has_read_problems());
+
+  // Data is unavailable
+  validator->ReadBlock(test_data.data(), 0, 100);
+
+  EXPECT_TRUE(validator->has_read_problems());
+  EXPECT_TRUE(validator->has_unavailable_data());
+  EXPECT_FALSE(validator->read_error());
+
+  {
+    const CPDF_ReadValidator::Session read_subsession(validator.Get());
+    // The read problems should be hidden.
+    EXPECT_FALSE(validator->has_read_problems());
+
+    file_avail.SetAvailableRange(0, 100);
+    // Read fail.
+    validator->ReadBlock(test_data.data(), 0, 100);
+    EXPECT_TRUE(validator->has_read_problems());
+    EXPECT_TRUE(validator->has_unavailable_data());
+    EXPECT_TRUE(validator->read_error());
+  }
+
+  // The problems should be merged
+  EXPECT_TRUE(validator->has_read_problems());
+  EXPECT_TRUE(validator->has_unavailable_data());
+  EXPECT_TRUE(validator->read_error());
+}
+
+TEST(CPDF_ReadValidatorTest, SessionReset) {
+  std::vector<uint8_t> test_data(kTestDataSize);
+
+  auto file = pdfium::MakeRetain<InvalidReader>();
+  MockFileAvail file_avail;
+  MockDownloadHints hints;
+  auto validator = pdfium::MakeRetain<CPDF_ReadValidator>(file, &file_avail);
+  validator->SetDownloadHints(&hints);
+
+  const CPDF_ReadValidator::Session read_session(validator.Get());
+  ASSERT_FALSE(validator->has_read_problems());
+
+  // Data is unavailable
+  validator->ReadBlock(test_data.data(), 0, 100);
+
+  EXPECT_TRUE(validator->has_read_problems());
+  EXPECT_TRUE(validator->has_unavailable_data());
+  EXPECT_FALSE(validator->read_error());
+
+  {
+    const CPDF_ReadValidator::Session read_subsession(validator.Get());
+    // The read problems should be hidden.
+    EXPECT_FALSE(validator->has_read_problems());
+
+    file_avail.SetAvailableRange(0, 100);
+    // Read fail.
+    validator->ReadBlock(test_data.data(), 0, 100);
+    EXPECT_TRUE(validator->has_read_problems());
+    EXPECT_TRUE(validator->has_unavailable_data());
+    EXPECT_TRUE(validator->read_error());
+
+    // Reset session.
+    validator->ResetErrors();
+    EXPECT_FALSE(validator->has_read_problems());
+  }
+
+  // The problems should be restored.
+  EXPECT_TRUE(validator->has_read_problems());
+  EXPECT_TRUE(validator->has_unavailable_data());
+  EXPECT_FALSE(validator->read_error());
+}