Merge to XFA: Various changes to JBig2 cache:

- Makes the cache be per-document
- Keys the cache on ObjNum and stream offset instead of keying on a pointer to the data (which can result in false cache hits).
- Makes it so the cache is only used for the globals stream.
- Reenable the cache.

R=dml@google.com
TBR=dml@google.com

BUG=pdfium:207

Review URL: https://codereview.chromium.org/1380243004 .

(cherry picked from commit f1b88e76134808f36f16b9e53a2e9dd89b12c8fd)

Review URL: https://codereview.chromium.org/1394373002 .

1 files changed, 5 insertions, 11 deletions

diff --git a/core/src/fxcodec/codec/codec_int.h b/core/src/fxcodec/codec/codec_int.h
index 043f62f0e3..e26b542976 100644
--- a/core/src/fxcodec/codec/codec_int.h
+++ b/core/src/fxcodec/codec/codec_int.h
@@ -357,10 +357,8 @@ class CCodec_Jbig2Context {
 
   FX_DWORD m_width;
   FX_DWORD m_height;
-  uint8_t* m_src_buf;
-  FX_DWORD m_src_size;
-  const uint8_t* m_global_data;
-  FX_DWORD m_global_size;
+  CPDF_StreamAcc* m_pGlobalStream;
+  CPDF_StreamAcc* m_pSrcStream;
   uint8_t* m_dest_buf;
   FX_DWORD m_dest_pitch;
   IFX_Pause* m_pPause;
@@ -375,21 +373,17 @@ class CCodec_Jbig2Module : public ICodec_Jbig2Module {
   // ICodec_Jbig2Module
   void* CreateJbig2Context() override;
   FXCODEC_STATUS StartDecode(void* pJbig2Context,
+                             CFX_PrivateData* pPrivateData,
                              FX_DWORD width,
                              FX_DWORD height,
-                             const uint8_t* src_buf,
-                             FX_DWORD src_size,
-                             const uint8_t* global_data,
-                             FX_DWORD global_size,
+                             CPDF_StreamAcc* src_stream,
+                             CPDF_StreamAcc* global_stream,
                              uint8_t* dest_buf,
                              FX_DWORD dest_pitch,
                              IFX_Pause* pPause) override;
   FXCODEC_STATUS ContinueDecode(void* pJbig2Context,
                                 IFX_Pause* pPause) override;
   void DestroyJbig2Context(void* pJbig2Context) override;
-
- private:
-  std::list<CJBig2_CachePair> m_SymbolDictCache;
 };
 class CFX_DIBAttributeExif : public IFX_DIBAttributeExif {
  public: