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, 11 insertions, 0 deletions

diff --git a/core/fpdfapi/parser/cpdf_read_validator.h b/core/fpdfapi/parser/cpdf_read_validator.h
index da8acfe23b..9cc22c1ccc 100644
--- a/core/fpdfapi/parser/cpdf_read_validator.h
+++ b/core/fpdfapi/parser/cpdf_read_validator.h
@@ -12,6 +12,17 @@ class CPDF_ReadValidator : public IFX_SeekableReadStream {
   template <typename T, typename... Args>
   friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
 
+  class Session {
+   public:
+    explicit Session(CPDF_ReadValidator* validator);
+    ~Session();
+
+   private:
+    CFX_UnownedPtr<CPDF_ReadValidator> validator_;
+    bool saved_read_error_;
+    bool saved_has_unavailable_data_;
+  };
+
   void SetDownloadHints(CPDF_DataAvail::DownloadHints* hints) {
     hints_ = hints;
   }