Split up JBig2_GeneralDecoder.cpp.

core/src/fxcodec/jbig2/JBig2_GsidProc.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_GsidProc.h"
+
+#include "../../../../third_party/base/nonstd_unique_ptr.h"
+#include "../../../include/fxcrt/fx_basic.h"
+#include "JBig2_BitStream.h"
+#include "JBig2_GrdProc.h"
+#include "JBig2_Image.h"
+
+FX_DWORD* CJBig2_GSIDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
+                                        JBig2ArithCtx* gbContext,
+                                        IFX_Pause* pPause) {
+  CJBig2_Image** GSPLANES;
+  int32_t J, K;
+  FX_DWORD x, y;
+  FX_DWORD* GSVALS;
+  GSPLANES = FX_Alloc(CJBig2_Image*, GSBPP);
+  GSVALS = FX_Alloc2D(FX_DWORD, GSW, GSH);
+  JBIG2_memset(GSPLANES, 0, sizeof(CJBig2_Image*) * GSBPP);
+  JBIG2_memset(GSVALS, 0, sizeof(FX_DWORD) * GSW * GSH);
+
+  nonstd::unique_ptr<CJBig2_GRDProc> pGRD(new CJBig2_GRDProc());
+  pGRD->MMR = GSMMR;
+  pGRD->GBW = GSW;
+  pGRD->GBH = GSH;
+  pGRD->GBTEMPLATE = GSTEMPLATE;
+  pGRD->TPGDON = 0;
+  pGRD->USESKIP = GSUSESKIP;
+  pGRD->SKIP = GSKIP;
+  if (GSTEMPLATE <= 1) {
+    pGRD->GBAT[0] = 3;
+  } else {
+    pGRD->GBAT[0] = 2;
+  }
+  pGRD->GBAT[1] = -1;
+  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(
+      &GSPLANES[GSBPP - 1], pArithDecoder, gbContext, nullptr);
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+    pGRD->Continue_decode(pPause);
+  }
+  if (!GSPLANES[GSBPP - 1]) {
+    goto failed;
+  }
+  J = GSBPP - 2;
+  while (J >= 0) {
+    FXCODEC_STATUS status = pGRD->Start_decode_Arith(
+        &GSPLANES[J], pArithDecoder, gbContext, nullptr);
+    while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+      pGRD->Continue_decode(pPause);
+    }
+    if (!GSPLANES[J]) {
+      for (K = GSBPP - 1; K > J; K--) {
+        delete GSPLANES[K];
+        goto failed;
+      }
+    }
+    GSPLANES[J]->composeFrom(0, 0, GSPLANES[J + 1], JBIG2_COMPOSE_XOR);
+    J = J - 1;
+  }
+  for (y = 0; y < GSH; y++) {
+    for (x = 0; x < GSW; x++) {
+      for (J = 0; J < GSBPP; J++) {
+        GSVALS[y * GSW + x] |= GSPLANES[J]->getPixel(x, y) << J;
+      }
+    }
+  }
+  for (J = 0; J < GSBPP; J++) {
+    delete GSPLANES[J];
+  }
+  FX_Free(GSPLANES);
+  return GSVALS;
+failed:
+  FX_Free(GSPLANES);
+  FX_Free(GSVALS);
+  return nullptr;
+}
+
+FX_DWORD* CJBig2_GSIDProc::decode_MMR(CJBig2_BitStream* pStream,
+                                      IFX_Pause* pPause) {
+  CJBig2_Image** GSPLANES;
+  int32_t J, K;
+  FX_DWORD x, y;
+  FX_DWORD* GSVALS;
+  GSPLANES = FX_Alloc(CJBig2_Image*, GSBPP);
+  GSVALS = FX_Alloc2D(FX_DWORD, GSW, GSH);
+  JBIG2_memset(GSPLANES, 0, sizeof(CJBig2_Image*) * GSBPP);
+  JBIG2_memset(GSVALS, 0, sizeof(FX_DWORD) * GSW * GSH);
+
+  nonstd::unique_ptr<CJBig2_GRDProc> pGRD(new CJBig2_GRDProc());
+  pGRD->MMR = GSMMR;
+  pGRD->GBW = GSW;
+  pGRD->GBH = GSH;
+  FXCODEC_STATUS status =
+      pGRD->Start_decode_MMR(&GSPLANES[GSBPP - 1], pStream, nullptr);
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+    pGRD->Continue_decode(pPause);
+  }
+  if (!GSPLANES[GSBPP - 1]) {
+    goto failed;
+  }
+  pStream->alignByte();
+  pStream->offset(3);
+  J = GSBPP - 2;
+  while (J >= 0) {
+    FXCODEC_STATUS status =
+        pGRD->Start_decode_MMR(&GSPLANES[J], pStream, nullptr);
+    while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+      pGRD->Continue_decode(pPause);
+    }
+    if (!GSPLANES[J]) {
+      for (K = GSBPP - 1; K > J; K--) {
+        delete GSPLANES[K];
+        goto failed;
+      }
+    }
+    pStream->alignByte();
+    pStream->offset(3);
+    GSPLANES[J]->composeFrom(0, 0, GSPLANES[J + 1], JBIG2_COMPOSE_XOR);
+    J = J - 1;
+  }
+  for (y = 0; y < GSH; y++) {
+    for (x = 0; x < GSW; x++) {
+      for (J = 0; J < GSBPP; J++) {
+        GSVALS[y * GSW + x] |= GSPLANES[J]->getPixel(x, y) << J;
+      }
+    }
+  }
+  for (J = 0; J < GSBPP; J++) {
+    delete GSPLANES[J];
+  }
+  FX_Free(GSPLANES);
+  return GSVALS;
+failed:
+  FX_Free(GSPLANES);
+  FX_Free(GSVALS);
+  return nullptr;
+}