Split up JBig2_GeneralDecoder.cpp.

core/src/fxcodec/jbig2/JBig2_PddProc.cpp

+// Copyright 2015 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 "JBig2_PddProc.h"
+
+#include "../../../../third_party/base/nonstd_unique_ptr.h"
+#include "JBig2_GrdProc.h"
+#include "JBig2_Image.h"
+#include "JBig2_PatternDict.h"
+
+CJBig2_PatternDict* CJBig2_PDDProc::decode_Arith(
+    CJBig2_ArithDecoder* pArithDecoder,
+    JBig2ArithCtx* gbContext,
+    IFX_Pause* pPause) {
+  FX_DWORD GRAY;
+  CJBig2_Image* BHDC = nullptr;
+  nonstd::unique_ptr<CJBig2_PatternDict> pDict(new CJBig2_PatternDict());
+  pDict->NUMPATS = GRAYMAX + 1;
+  pDict->HDPATS = FX_Alloc(CJBig2_Image*, pDict->NUMPATS);
+  JBIG2_memset(pDict->HDPATS, 0, sizeof(CJBig2_Image*) * pDict->NUMPATS);
+
+  nonstd::unique_ptr<CJBig2_GRDProc> pGRD(new CJBig2_GRDProc());
+  pGRD->MMR = HDMMR;
+  pGRD->GBW = (GRAYMAX + 1) * HDPW;
+  pGRD->GBH = HDPH;
+  pGRD->GBTEMPLATE = HDTEMPLATE;
+  pGRD->TPGDON = 0;
+  pGRD->USESKIP = 0;
+  pGRD->GBAT[0] = -(int32_t)HDPW;
+  pGRD->GBAT[1] = 0;
+  if (pGRD->GBTEMPLATE == 0) {
+    pGRD->GBAT[2] = -3;
+    pGRD->GBAT[3] = -1;
+    pGRD->GBAT[4] = 2;
+    pGRD->GBAT[5] = -2;
+    pGRD->GBAT[6] = -2;
+    pGRD->GBAT[7] = -2;
+  }
+  FXCODEC_STATUS status =
+      pGRD->Start_decode_Arith(&BHDC, pArithDecoder, gbContext, nullptr);
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+    pGRD->Continue_decode(pPause);
+  }
+  if (!BHDC)
+    return nullptr;
+
+  GRAY = 0;
+  while (GRAY <= GRAYMAX) {
+    pDict->HDPATS[GRAY] = BHDC->subImage(HDPW * GRAY, 0, HDPW, HDPH);
+    GRAY = GRAY + 1;
+  }
+  delete BHDC;
+  return pDict.release();
+}
+
+CJBig2_PatternDict* CJBig2_PDDProc::decode_MMR(CJBig2_BitStream* pStream,
+                                               IFX_Pause* pPause) {
+  FX_DWORD GRAY;
+  CJBig2_Image* BHDC = nullptr;
+  nonstd::unique_ptr<CJBig2_PatternDict> pDict(new CJBig2_PatternDict());
+  pDict->NUMPATS = GRAYMAX + 1;
+  pDict->HDPATS = FX_Alloc(CJBig2_Image*, pDict->NUMPATS);
+  JBIG2_memset(pDict->HDPATS, 0, sizeof(CJBig2_Image*) * pDict->NUMPATS);
+
+  nonstd::unique_ptr<CJBig2_GRDProc> pGRD(new CJBig2_GRDProc());
+  pGRD->MMR = HDMMR;
+  pGRD->GBW = (GRAYMAX + 1) * HDPW;
+  pGRD->GBH = HDPH;
+  FXCODEC_STATUS status = pGRD->Start_decode_MMR(&BHDC, pStream, nullptr);
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+    pGRD->Continue_decode(pPause);
+  }
+  if (!BHDC)
+    return nullptr;
+
+  GRAY = 0;
+  while (GRAY <= GRAYMAX) {
+    pDict->HDPATS[GRAY] = BHDC->subImage(HDPW * GRAY, 0, HDPW, HDPH);
+    GRAY = GRAY + 1;
+  }
+  delete BHDC;
+  return pDict.release();
+}