Create virtual codec APIs so chrome/fuzzers can link separately

The one step to make an actual concrete class is conditionalized
in fpdfview and is unconditional in the fuzzer.

Also replace the clumsy C-style callbacks with a delegate
interface as long as we are making new interfaces.

Change-Id: I733a437483ce5e0c34211cfbbda05105336f55b5
Reviewed-on: https://pdfium-review.googlesource.com/2887
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/core/fxcodec/codec/icodec_gifmodule.h b/core/fxcodec/codec/icodec_gifmodule.h
new file mode 100644
index 0000000000..9dc0708ebe
--- /dev/null
+++ b/core/fxcodec/codec/icodec_gifmodule.h
@@ -0,0 +1,68 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCODEC_CODEC_ICODEC_GIFMODULE_H_
+#define CORE_FXCODEC_CODEC_ICODEC_GIFMODULE_H_
+
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxcrt/fx_system.h"
+
+class CFX_DIBAttribute;
+struct FXGIF_Context;
+
+// Virtual interface to avoid linking in a concrete implementation
+// if we do not enable this codec.
+class ICodec_GifModule {
+ public:
+  class Delegate {
+   public:
+    virtual void GifRecordCurrentPosition(uint32_t& cur_pos) = 0;
+    virtual uint8_t* GifAskLocalPaletteBuf(int32_t frame_num,
+                                           int32_t pal_size) = 0;
+    virtual bool GifInputRecordPositionBuf(uint32_t rcd_pos,
+                                           const FX_RECT& img_rc,
+                                           int32_t pal_num,
+                                           void* pal_ptr,
+                                           int32_t delay_time,
+                                           bool user_input,
+                                           int32_t trans_index,
+                                           int32_t disposal_method,
+                                           bool interlace) = 0;
+    virtual void GifReadScanline(int32_t row_num, uint8_t* row_buf) = 0;
+  };
+
+  virtual ~ICodec_GifModule() {}
+
+  virtual FXGIF_Context* Start() = 0;
+  virtual void Finish(FXGIF_Context* pContext) = 0;
+  virtual uint32_t GetAvailInput(FXGIF_Context* pContext,
+                                 uint8_t** avail_buf_ptr = nullptr) = 0;
+
+  virtual void Input(FXGIF_Context* pContext,
+                     const uint8_t* src_buf,
+                     uint32_t src_size) = 0;
+
+  virtual int32_t ReadHeader(FXGIF_Context* pContext,
+                             int* width,
+                             int* height,
+                             int* pal_num,
+                             void** pal_pp,
+                             int* bg_index,
+                             CFX_DIBAttribute* pAttribute) = 0;
+
+  virtual int32_t LoadFrameInfo(FXGIF_Context* pContext, int* frame_num) = 0;
+  virtual int32_t LoadFrame(FXGIF_Context* pContext,
+                            int frame_num,
+                            CFX_DIBAttribute* pAttribute) = 0;
+
+  Delegate* GetDelegate() const { return m_pDelegate; }
+  void SetDelegate(Delegate* pDelegate) { m_pDelegate = pDelegate; }
+
+ protected:
+  Delegate* m_pDelegate;
+};
+
+#endif  // CORE_FXCODEC_CODEC_ICODEC_GIFMODULE_H_