Implement CPDF_ObjStream.

It is allow do not store raw objects streams within CPDF_Document
for reduce memory usage.

Change-Id: I4377bd5119d87314e76f14255171618cf6ee533d
Reviewed-on: https://pdfium-review.googlesource.com/35430
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Art Snake <art-snake@yandex-team.ru>

1 files changed, 4 insertions, 11 deletions

diff --git a/core/fpdfapi/parser/cpdf_parser.h b/core/fpdfapi/parser/cpdf_parser.h
index 5f0a4a1cf3..705fad9bdb 100644
--- a/core/fpdfapi/parser/cpdf_parser.h
+++ b/core/fpdfapi/parser/cpdf_parser.h
@@ -26,9 +26,9 @@ class CPDF_Document;
 class CPDF_IndirectObjectHolder;
 class CPDF_LinearizedHeader;
 class CPDF_Object;
+class CPDF_ObjectStream;
 class CPDF_ReadValidator;
 class CPDF_SecurityHandler;
-class CPDF_StreamAcc;
 class CPDF_SyntaxParser;
 class IFX_SeekableReadStream;
 
@@ -172,7 +172,8 @@ class CPDF_Parser {
   bool LoadLinearizedAllCrossRefV4(FX_FILESIZE pos);
   bool LoadLinearizedAllCrossRefV5(FX_FILESIZE pos);
   Error LoadLinearizedMainXRefTable();
-  RetainPtr<CPDF_StreamAcc> GetObjectStream(uint32_t number);
+  const CPDF_ObjectStream* GetObjectStream(CPDF_IndirectObjectHolder* pObjList,
+                                           uint32_t object_number);
   std::unique_ptr<CPDF_LinearizedHeader> ParseLinearizedHeader();
   void SetEncryptDictionary(CPDF_Dictionary* pDict);
   void ShrinkObjectMap(uint32_t size);
@@ -218,15 +219,7 @@ class CPDF_Parser {
   std::unique_ptr<CPDF_LinearizedHeader> m_pLinearized;
 
   // A map of object numbers to indirect streams.
-  std::map<uint32_t, RetainPtr<CPDF_StreamAcc>> m_ObjectStreamMap;
-
-  // Mapping of object numbers to offsets. The offsets are relative to the first
-  // object in the stream.
-  using StreamObjectCache = std::map<uint32_t, uint32_t>;
-
-  // Mapping of streams to their object caches. This is valid as long as the
-  // streams in |m_ObjectStreamMap| are valid.
-  std::map<RetainPtr<CPDF_StreamAcc>, StreamObjectCache> m_ObjCache;
+  std::map<uint32_t, std::unique_ptr<CPDF_ObjectStream>> m_ObjectStreamMap;
 
   // All indirect object numbers that are being parsed.
   std::set<uint32_t> m_ParsingObjNums;