diff --git a/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp b/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
index 33b88bf..a410032 100644
--- a/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
+++ b/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.cpp
@@ -39,28 +39,27 @@
     return pImage;
   }
   if (GBTEMPLATE == 0) {
-    if ((GBAT[0] == 3) && (GBAT[1] == (signed char)-1) &&
-        (GBAT[2] == (signed char)-3) && (GBAT[3] == (signed char)-1) &&
-        (GBAT[4] == 2) && (GBAT[5] == (signed char)-2) &&
-        (GBAT[6] == (signed char)-2) && (GBAT[7] == (signed char)-2)) {
+    if ((GBAT[0] == 3) && (GBAT[1] == (int8_t)-1) && (GBAT[2] == (int8_t)-3) &&
+        (GBAT[3] == (int8_t)-1) && (GBAT[4] == 2) && (GBAT[5] == (int8_t)-2) &&
+        (GBAT[6] == (int8_t)-2) && (GBAT[7] == (int8_t)-2)) {
       return decode_Arith_Template0_opt3(pArithDecoder, gbContext);
     } else {
       return decode_Arith_Template0_unopt(pArithDecoder, gbContext);
     }
   } else if (GBTEMPLATE == 1) {
-    if ((GBAT[0] == 3) && (GBAT[1] == (signed char)-1)) {
+    if ((GBAT[0] == 3) && (GBAT[1] == (int8_t)-1)) {
       return decode_Arith_Template1_opt3(pArithDecoder, gbContext);
     } else {
       return decode_Arith_Template1_unopt(pArithDecoder, gbContext);
     }
   } else if (GBTEMPLATE == 2) {
-    if ((GBAT[0] == 2) && (GBAT[1] == (signed char)-1)) {
+    if ((GBAT[0] == 2) && (GBAT[1] == (int8_t)-1)) {
       return decode_Arith_Template2_opt3(pArithDecoder, gbContext);
     } else {
       return decode_Arith_Template2_unopt(pArithDecoder, gbContext);
     }
   } else {
-    if ((GBAT[0] == 2) && (GBAT[1] == (signed char)-1)) {
+    if ((GBAT[0] == 2) && (GBAT[1] == (int8_t)-1)) {
       return decode_Arith_Template3_opt3(pArithDecoder, gbContext);
     } else {
       return decode_Arith_Template3_unopt(pArithDecoder, gbContext);
@@ -1067,8 +1066,8 @@
     return pImage;
   }
   if (GRTEMPLATE == 0) {
-    if ((GRAT[0] == (signed char)-1) && (GRAT[1] == (signed char)-1) &&
-        (GRAT[2] == (signed char)-1) && (GRAT[3] == (signed char)-1) &&
+    if ((GRAT[0] == (int8_t)-1) && (GRAT[1] == (int8_t)-1) &&
+        (GRAT[2] == (int8_t)-1) && (GRAT[3] == (int8_t)-1) &&
         (GRREFERENCEDX == 0) && (GRW == (FX_DWORD)GRREFERENCE->m_nWidth)) {
       return decode_Template0_opt(pArithDecoder, grContext);
     } else {
@@ -3247,10 +3246,9 @@
   int iline = m_loopIndex;
   CJBig2_Image* pImage = *m_pImage;
   if (GBTEMPLATE == 0) {
-    if ((GBAT[0] == 3) && (GBAT[1] == (signed char)-1) &&
-        (GBAT[2] == (signed char)-3) && (GBAT[3] == (signed char)-1) &&
-        (GBAT[4] == 2) && (GBAT[5] == (signed char)-2) &&
-        (GBAT[6] == (signed char)-2) && (GBAT[7] == (signed char)-2)) {
+    if ((GBAT[0] == 3) && (GBAT[1] == (int8_t)-1) && (GBAT[2] == (int8_t)-3) &&
+        (GBAT[3] == (int8_t)-1) && (GBAT[4] == 2) && (GBAT[5] == (int8_t)-2) &&
+        (GBAT[6] == (int8_t)-2) && (GBAT[7] == (int8_t)-2)) {
       m_ProssiveStatus = decode_Arith_Template0_opt3(pImage, m_pArithDecoder,
                                                      m_gbContext, pPause);
     } else {
@@ -3258,7 +3256,7 @@
                                                       m_gbContext, pPause);
     }
   } else if (GBTEMPLATE == 1) {
-    if ((GBAT[0] == 3) && (GBAT[1] == (signed char)-1)) {
+    if ((GBAT[0] == 3) && (GBAT[1] == (int8_t)-1)) {
       m_ProssiveStatus = decode_Arith_Template1_opt3(pImage, m_pArithDecoder,
                                                      m_gbContext, pPause);
     } else {
@@ -3266,7 +3264,7 @@
                                                       m_gbContext, pPause);
     }
   } else if (GBTEMPLATE == 2) {
-    if ((GBAT[0] == 2) && (GBAT[1] == (signed char)-1)) {
+    if ((GBAT[0] == 2) && (GBAT[1] == (int8_t)-1)) {
       m_ProssiveStatus = decode_Arith_Template2_opt3(pImage, m_pArithDecoder,
                                                      m_gbContext, pPause);
     } else {
@@ -3274,7 +3272,7 @@
                                                       m_gbContext, pPause);
     }
   } else {
-    if ((GBAT[0] == 2) && (GBAT[1] == (signed char)-1)) {
+    if ((GBAT[0] == 2) && (GBAT[1] == (int8_t)-1)) {
       m_ProssiveStatus = decode_Arith_Template3_opt3(pImage, m_pArithDecoder,
                                                      m_gbContext, pPause);
     } else {
diff --git a/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.h b/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.h
index 1b933d7..0b087a0 100644
--- a/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.h
+++ b/core/src/fxcodec/jbig2/JBig2_GeneralDecoder.h
@@ -59,7 +59,7 @@
   FX_BOOL TPGDON;
   FX_BOOL USESKIP;
   CJBig2_Image* SKIP;
-  char GBAT[8];
+  int8_t GBAT[8];
 
  private:
   FXCODEC_STATUS decode_Arith(IFX_Pause* pPause);
@@ -183,7 +183,7 @@
   int32_t GRREFERENCEDX;
   int32_t GRREFERENCEDY;
   FX_BOOL TPGRON;
-  signed char GRAT[4];
+  int8_t GRAT[4];
 };
 
 typedef struct {
@@ -220,11 +220,11 @@
   FX_BOOL TRANSPOSED;
 
   JBig2Corner REFCORNER;
-  signed char SBDSOFFSET;
+  int8_t SBDSOFFSET;
   CJBig2_HuffmanTable *SBHUFFFS, *SBHUFFDS, *SBHUFFDT, *SBHUFFRDW, *SBHUFFRDH,
       *SBHUFFRDX, *SBHUFFRDY, *SBHUFFRSIZE;
   FX_BOOL SBRTEMPLATE;
-  signed char SBRAT[4];
+  int8_t SBRAT[4];
 };
 class CJBig2_SDDProc : public CJBig2_Object {
  public:
@@ -246,9 +246,9 @@
   FX_DWORD SDNUMEXSYMS;
   CJBig2_HuffmanTable *SDHUFFDH, *SDHUFFDW, *SDHUFFBMSIZE, *SDHUFFAGGINST;
   uint8_t SDTEMPLATE;
-  signed char SDAT[8];
+  int8_t SDAT[8];
   FX_BOOL SDRTEMPLATE;
-  signed char SDRAT[4];
+  int8_t SDRAT[4];
 };
 class CJBig2_HTRDProc : public CJBig2_Object {
  public: