2 files changed, 31 insertions, 5 deletions
diff --git a/core/fpdfapi/parser/cpdf_data_avail.cpp b/core/fpdfapi/parser/cpdf_data_avail.cpp
index 4259d731cc..e72d7cdb19 100644
--- a/core/fpdfapi/parser/cpdf_data_avail.cpp
+++ b/core/fpdfapi/parser/cpdf_data_avail.cpp
@@ -106,10 +106,6 @@ CPDF_DataAvail::~CPDF_DataAvail() {
   m_pHintTables.reset();
 }
 
-void CPDF_DataAvail::SetDocument(CPDF_Document* pDoc) {
-  m_pDocument = pDoc;
-}
-
 CPDF_DataAvail::DocAvailStatus CPDF_DataAvail::IsDocAvail(
     DownloadHints* pHints) {
   if (!m_dwFileLen)
@@ -1044,6 +1040,33 @@ bool CPDF_DataAvail::ValidatePage(uint32_t dwPage) {
   return obj_avail.CheckAvail() == DocAvailStatus::DataAvailable;
 }
 
+std::pair<CPDF_Parser::Error, std::unique_ptr<CPDF_Document>>
+CPDF_DataAvail::ParseDocument(const char* password) {
+  if (m_pDocument) {
+    // We already returned parsed document.
+    return std::make_pair(CPDF_Parser::HANDLER_ERROR, nullptr);
+  }
+  auto parser = pdfium::MakeUnique<CPDF_Parser>();
+  parser->SetPassword(password);
+  auto document = pdfium::MakeUnique<CPDF_Document>(std::move(parser));
+
+  CPDF_ReadValidator::Session read_session(GetValidator().Get());
+  CPDF_Parser::Error error = document->GetParser()->StartLinearizedParse(
+      GetFileRead(), document.get());
+
+  // Additional check, that all ok.
+  if (GetValidator()->has_read_problems()) {
+    NOTREACHED();
+    return std::make_pair(CPDF_Parser::HANDLER_ERROR, nullptr);
+  }
+
+  if (error != CPDF_Parser::SUCCESS)
+    return std::make_pair(error, nullptr);
+
+  m_pDocument = document.get();
+  return std::make_pair(CPDF_Parser::SUCCESS, std::move(document));
+}
+
 CPDF_DataAvail::PageNode::PageNode() : m_type(PDF_PAGENODE_UNKNOWN) {}
 
 CPDF_DataAvail::PageNode::~PageNode() {}
diff --git a/core/fpdfapi/parser/cpdf_data_avail.h b/core/fpdfapi/parser/cpdf_data_avail.h
index 8916088556..001bf2280f 100644
--- a/core/fpdfapi/parser/cpdf_data_avail.h
+++ b/core/fpdfapi/parser/cpdf_data_avail.h
@@ -10,6 +10,7 @@
 #include <map>
 #include <memory>
 #include <set>
+#include <utility>
 #include <vector>
 
 #include "core/fpdfapi/parser/cpdf_parser.h"
@@ -96,7 +97,6 @@ class CPDF_DataAvail final {
   ~CPDF_DataAvail();
 
   DocAvailStatus IsDocAvail(DownloadHints* pHints);
-  void SetDocument(CPDF_Document* pDoc);
   DocAvailStatus IsPageAvail(uint32_t dwPage, DownloadHints* pHints);
   DocFormStatus IsFormAvail(DownloadHints* pHints);
   DocLinearizationStatus IsLinearizedPDF();
@@ -105,6 +105,9 @@ class CPDF_DataAvail final {
   CPDF_Dictionary* GetPage(int index);
   RetainPtr<CPDF_ReadValidator> GetValidator() const;
 
+  std::pair<CPDF_Parser::Error, std::unique_ptr<CPDF_Document>> ParseDocument(
+      const char* password);
+
   const CPDF_HintTables* GetHintTables() const { return m_pHintTables.get(); }
 
  protected: