Allow building XFA without additional codecs.

This is something we'd like to try for initial XFA launches
adding in codecs as justified by results in the wild.

Adding statistics for the unsupported cases is a follow-up
exercise once this builds correctly.

We always build all the additional libraries, to allow
fuzzers to link against them even if we are not shipping
them.  The linker will sort it out for the actual code.

Rename some files to match the classes contained within.

That the existing tests seem to pass with the codecs
disabled warrants further investigation.

Change-Id: Iad269db91289f12dc9f5dda8f48121d27a0c4367
Reviewed-on: https://pdfium-review.googlesource.com/2836
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/core/fxcodec/codec/ccodec_gifmodule.cpp b/core/fxcodec/codec/ccodec_gifmodule.cpp
new file mode 100644
index 0000000000..e3b2648c43
--- /dev/null
+++ b/core/fxcodec/codec/ccodec_gifmodule.cpp
@@ -0,0 +1,189 @@
+// Copyright 2014 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
+
+#include "core/fxcodec/codec/ccodec_gifmodule.h"
+
+#include "core/fxcodec/codec/codec_int.h"
+#include "core/fxcodec/fx_codec.h"
+#include "core/fxcodec/lgif/fx_gif.h"
+#include "core/fxge/fx_dib.h"
+
+struct FXGIF_Context {
+  gif_decompress_struct_p gif_ptr;
+  void* parent_ptr;
+  void* child_ptr;
+
+  void* (*m_AllocFunc)(unsigned int);
+  void (*m_FreeFunc)(void*);
+};
+extern "C" {
+static void* gif_alloc_func(unsigned int size) {
+  return FX_Alloc(char, size);
+}
+static void gif_free_func(void* p) {
+  FX_Free(p);
+}
+};
+static void gif_error_data(gif_decompress_struct_p gif_ptr,
+                           const FX_CHAR* err_msg) {
+  FXSYS_strncpy((char*)gif_ptr->err_ptr, err_msg, GIF_MAX_ERROR_SIZE - 1);
+  longjmp(gif_ptr->jmpbuf, 1);
+}
+static uint8_t* gif_ask_buf_for_pal(gif_decompress_struct_p gif_ptr,
+                                    int32_t pal_size) {
+  FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
+  CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
+  return pModule->AskLocalPaletteBufCallback(
+      p->child_ptr, gif_get_frame_num(gif_ptr), pal_size);
+}
+static void gif_record_current_position(gif_decompress_struct_p gif_ptr,
+                                        uint32_t* cur_pos_ptr) {
+  FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
+  CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
+  pModule->RecordCurrentPositionCallback(p->child_ptr, *cur_pos_ptr);
+}
+static void gif_read_scanline(gif_decompress_struct_p gif_ptr,
+                              int32_t row_num,
+                              uint8_t* row_buf) {
+  FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
+  CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
+  pModule->ReadScanlineCallback(p->child_ptr, row_num, row_buf);
+}
+static bool gif_get_record_position(gif_decompress_struct_p gif_ptr,
+                                    uint32_t cur_pos,
+                                    int32_t left,
+                                    int32_t top,
+                                    int32_t width,
+                                    int32_t height,
+                                    int32_t pal_num,
+                                    void* pal_ptr,
+                                    int32_t delay_time,
+                                    bool user_input,
+                                    int32_t trans_index,
+                                    int32_t disposal_method,
+                                    bool interlace) {
+  FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
+  CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
+  return pModule->InputRecordPositionBufCallback(
+      p->child_ptr, cur_pos, FX_RECT(left, top, left + width, top + height),
+      pal_num, pal_ptr, delay_time, user_input, trans_index, disposal_method,
+      interlace);
+}
+
+FXGIF_Context* CCodec_GifModule::Start(void* pModule) {
+  FXGIF_Context* p = FX_Alloc(FXGIF_Context, 1);
+  if (!p)
+    return nullptr;
+
+  FXSYS_memset(p, 0, sizeof(FXGIF_Context));
+  p->m_AllocFunc = gif_alloc_func;
+  p->m_FreeFunc = gif_free_func;
+  p->gif_ptr = nullptr;
+  p->parent_ptr = (void*)this;
+  p->child_ptr = pModule;
+  p->gif_ptr = gif_create_decompress();
+  if (!p->gif_ptr) {
+    FX_Free(p);
+    return nullptr;
+  }
+  p->gif_ptr->context_ptr = (void*)p;
+  p->gif_ptr->err_ptr = m_szLastError;
+  p->gif_ptr->gif_error_fn = gif_error_data;
+  p->gif_ptr->gif_ask_buf_for_pal_fn = gif_ask_buf_for_pal;
+  p->gif_ptr->gif_record_current_position_fn = gif_record_current_position;
+  p->gif_ptr->gif_get_row_fn = gif_read_scanline;
+  p->gif_ptr->gif_get_record_position_fn = gif_get_record_position;
+  return p;
+}
+
+void CCodec_GifModule::Finish(FXGIF_Context* ctx) {
+  if (ctx) {
+    gif_destroy_decompress(&ctx->gif_ptr);
+    ctx->m_FreeFunc(ctx);
+  }
+}
+
+int32_t CCodec_GifModule::ReadHeader(FXGIF_Context* ctx,
+                                     int* width,
+                                     int* height,
+                                     int* pal_num,
+                                     void** pal_pp,
+                                     int* bg_index,
+                                     CFX_DIBAttribute* pAttribute) {
+  if (setjmp(ctx->gif_ptr->jmpbuf))
+    return 0;
+
+  int32_t ret = gif_read_header(ctx->gif_ptr);
+  if (ret != 1)
+    return ret;
+
+  *width = ctx->gif_ptr->width;
+  *height = ctx->gif_ptr->height;
+  *pal_num = ctx->gif_ptr->global_pal_num;
+  *pal_pp = ctx->gif_ptr->global_pal_ptr;
+  *bg_index = ctx->gif_ptr->bc_index;
+  return 1;
+}
+
+int32_t CCodec_GifModule::LoadFrameInfo(FXGIF_Context* ctx, int* frame_num) {
+  if (setjmp(ctx->gif_ptr->jmpbuf))
+    return 0;
+
+  int32_t ret = gif_get_frame(ctx->gif_ptr);
+  if (ret != 1)
+    return ret;
+
+  *frame_num = gif_get_frame_num(ctx->gif_ptr);
+  return 1;
+}
+
+int32_t CCodec_GifModule::LoadFrame(FXGIF_Context* ctx,
+                                    int frame_num,
+                                    CFX_DIBAttribute* pAttribute) {
+  if (setjmp(ctx->gif_ptr->jmpbuf))
+    return 0;
+
+  int32_t ret = gif_load_frame(ctx->gif_ptr, frame_num);
+  if (ret == 1) {
+    if (pAttribute) {
+      pAttribute->m_nGifLeft =
+          (*ctx->gif_ptr->img_ptr_arr_ptr)[frame_num]->image_info_ptr->left;
+      pAttribute->m_nGifTop =
+          (*ctx->gif_ptr->img_ptr_arr_ptr)[frame_num]->image_info_ptr->top;
+      pAttribute->m_fAspectRatio = ctx->gif_ptr->pixel_aspect;
+      if (ctx->gif_ptr->cmt_data_ptr) {
+        const uint8_t* buf =
+            (const uint8_t*)ctx->gif_ptr->cmt_data_ptr->GetBuffer(0);
+        uint32_t len = ctx->gif_ptr->cmt_data_ptr->GetLength();
+        if (len > 21) {
+          uint8_t size = *buf++;
+          if (size) {
+            pAttribute->m_strAuthor = CFX_ByteString(buf, size);
+          } else {
+            pAttribute->m_strAuthor.clear();
+          }
+          buf += size;
+          size = *buf++;
+          if (size == 20) {
+            FXSYS_memcpy(pAttribute->m_strTime, buf, size);
+          }
+        }
+      }
+    }
+  }
+  return ret;
+}
+
+uint32_t CCodec_GifModule::GetAvailInput(FXGIF_Context* ctx,
+                                         uint8_t** avail_buf_ptr) {
+  return gif_get_avail_input(ctx->gif_ptr, avail_buf_ptr);
+}
+
+void CCodec_GifModule::Input(FXGIF_Context* ctx,
+                             const uint8_t* src_buf,
+                             uint32_t src_size) {
+  gif_input_buffer(ctx->gif_ptr, (uint8_t*)src_buf, src_size);
+}