Remove gotos in JBig2 code.

core/src/fxcodec/jbig2/JBig2_HuffmanTable.cpp

 // 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 "JBig2_HuffmanTable.h"
 
 #include <string.h>
 
@@ skipping 75 matching lines @@
 }
 
 #define HT_CHECK_MEMORY_ADJUST                   \
   if (NTEMP >= nSize) {                          \
     nSize += 16;                                 \
     PREFLEN = FX_Realloc(int, PREFLEN, nSize);   \
     RANGELEN = FX_Realloc(int, RANGELEN, nSize); \
     RANGELOW = FX_Realloc(int, RANGELOW, nSize); \
   }
 int CJBig2_HuffmanTable::parseFromCodedBuffer(CJBig2_BitStream* pStream) {
-  unsigned char HTPS, HTRS;
-  FX_DWORD HTLOW, HTHIGH;
-  FX_DWORD CURRANGELOW;
-  FX_DWORD nSize = 16;
-  int CURLEN, LENMAX, CURCODE, CURTEMP;
-  int* LENCOUNT;
-  int* FIRSTCODE;
   unsigned char cTemp;
-  if (pStream->read1Byte(&cTemp) == -1) {
-    goto failed;
-  }
+  if (pStream->read1Byte(&cTemp) == -1)
+    return FALSE;
+
   HTOOB = cTemp & 0x01;
-  HTPS = ((cTemp >> 1) & 0x07) + 1;
-  HTRS = ((cTemp >> 4) & 0x07) + 1;
+  unsigned char HTPS = ((cTemp >> 1) & 0x07) + 1;
+  unsigned char HTRS = ((cTemp >> 4) & 0x07) + 1;
+  FX_DWORD HTLOW;
+  FX_DWORD HTHIGH;
   if (pStream->readInteger(&HTLOW) == -1 ||
       pStream->readInteger(&HTHIGH) == -1 || HTLOW > HTHIGH) {
-    goto failed;
+    return FALSE;
   }
+  FX_DWORD nSize = 16;
   PREFLEN = FX_Alloc(int, nSize);
   RANGELEN = FX_Alloc(int, nSize);
   RANGELOW = FX_Alloc(int, nSize);
-  CURRANGELOW = HTLOW;
+  FX_DWORD CURRANGELOW = HTLOW;
   NTEMP = 0;
   do {
     HT_CHECK_MEMORY_ADJUST
     if ((pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) ||
         (pStream->readNBits(HTRS, &RANGELEN[NTEMP]) == -1)) {
-      goto failed;
+      return FALSE;
     }
     RANGELOW[NTEMP] = CURRANGELOW;
     CURRANGELOW = CURRANGELOW + (1 << RANGELEN[NTEMP]);
     NTEMP = NTEMP + 1;
   } while (CURRANGELOW < HTHIGH);
   HT_CHECK_MEMORY_ADJUST
-  if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) {
-    goto failed;
-  }
+  if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1)
+    return FALSE;
+
   RANGELEN[NTEMP] = 32;
   RANGELOW[NTEMP] = HTLOW - 1;
   NTEMP = NTEMP + 1;
   HT_CHECK_MEMORY_ADJUST
-  if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) {
-    goto failed;
-  }
+  if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1)
+    return FALSE;
+
   RANGELEN[NTEMP] = 32;
   RANGELOW[NTEMP] = HTHIGH;
   NTEMP = NTEMP + 1;
   if (HTOOB) {
     HT_CHECK_MEMORY_ADJUST
-    if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1) {
-      goto failed;
-    }
+    if (pStream->readNBits(HTPS, &PREFLEN[NTEMP]) == -1)
+      return FALSE;
     NTEMP = NTEMP + 1;
   }
   CODES = FX_Alloc(int, NTEMP);
-  LENMAX = 0;
+  int LENMAX = 0;
   for (int i = 0; i < NTEMP; i++) {
     if (PREFLEN[i] > LENMAX) {
       LENMAX = PREFLEN[i];
     }
   }
-  LENCOUNT = FX_Alloc(int, (LENMAX + 1));
+  int* LENCOUNT = FX_Alloc(int, (LENMAX + 1));

[Tom Sepez, 2015/10/05 16:34:32]

maybe nonstd::unique_ptr here and at 154 to lose the FX_FREES below.

[Lei Zhang, 2015/10/07 07:51:12]

Made them std::vectors.

   JBIG2_memset(LENCOUNT, 0, sizeof(int) * (LENMAX + 1));
-  FIRSTCODE = FX_Alloc(int, (LENMAX + 1));
+  int* FIRSTCODE = FX_Alloc(int, (LENMAX + 1));
   for (int i = 0; i < NTEMP; i++) {
     LENCOUNT[PREFLEN[i]]++;
   }
-  CURLEN = 1;
+  int CURLEN = 1;
   FIRSTCODE[0] = 0;
   LENCOUNT[0] = 0;
   while (CURLEN <= LENMAX) {
     FIRSTCODE[CURLEN] = (FIRSTCODE[CURLEN - 1] + LENCOUNT[CURLEN - 1]) << 1;
-    CURCODE = FIRSTCODE[CURLEN];
-    CURTEMP = 0;
+    int CURCODE = FIRSTCODE[CURLEN];
+    int CURTEMP = 0;
     while (CURTEMP < NTEMP) {
       if (PREFLEN[CURTEMP] == CURLEN) {
         CODES[CURTEMP] = CURCODE;
         CURCODE = CURCODE + 1;
       }
       CURTEMP = CURTEMP + 1;
     }
     CURLEN = CURLEN + 1;
   }
   FX_Free(LENCOUNT);
   FX_Free(FIRSTCODE);
   return TRUE;
-failed:
-  return FALSE;
 }