diff --git a/core/fpdfapi/font/cfx_cttgsubtable.cpp b/core/fpdfapi/font/cfx_cttgsubtable.cpp
index 79de426..da3ce76 100644
--- a/core/fpdfapi/font/cfx_cttgsubtable.cpp
+++ b/core/fpdfapi/font/cfx_cttgsubtable.cpp
@@ -27,7 +27,7 @@
 
 }  // namespace
 
-CFX_CTTGSUBTable::CFX_CTTGSUBTable(FT_Bytes gsub) {
+CFX_CTTGSUBTable::CFX_CTTGSUBTable(const uint8_t* gsub) {
   if (!LoadGSUBTable(gsub))
     return;
 
@@ -55,7 +55,7 @@
 
 CFX_CTTGSUBTable::~CFX_CTTGSUBTable() = default;
 
-bool CFX_CTTGSUBTable::LoadGSUBTable(FT_Bytes gsub) {
+bool CFX_CTTGSUBTable::LoadGSUBTable(const uint8_t* gsub) {
   if (FXSYS_UINT32_GET_MSBFIRST(gsub) != 0x00010000)
     return false;
 
@@ -146,46 +146,46 @@
   return -1;
 }
 
-uint8_t CFX_CTTGSUBTable::GetUInt8(FT_Bytes& p) const {
+uint8_t CFX_CTTGSUBTable::GetUInt8(const uint8_t*& p) const {
   uint8_t ret = p[0];
   p += 1;
   return ret;
 }
 
-int16_t CFX_CTTGSUBTable::GetInt16(FT_Bytes& p) const {
+int16_t CFX_CTTGSUBTable::GetInt16(const uint8_t*& p) const {
   uint16_t ret = FXSYS_UINT16_GET_MSBFIRST(p);
   p += 2;
   return *reinterpret_cast<int16_t*>(&ret);
 }
 
-uint16_t CFX_CTTGSUBTable::GetUInt16(FT_Bytes& p) const {
+uint16_t CFX_CTTGSUBTable::GetUInt16(const uint8_t*& p) const {
   uint16_t ret = FXSYS_UINT16_GET_MSBFIRST(p);
   p += 2;
   return ret;
 }
 
-int32_t CFX_CTTGSUBTable::GetInt32(FT_Bytes& p) const {
+int32_t CFX_CTTGSUBTable::GetInt32(const uint8_t*& p) const {
   uint32_t ret = FXSYS_UINT32_GET_MSBFIRST(p);
   p += 4;
   return *reinterpret_cast<int32_t*>(&ret);
 }
 
-uint32_t CFX_CTTGSUBTable::GetUInt32(FT_Bytes& p) const {
+uint32_t CFX_CTTGSUBTable::GetUInt32(const uint8_t*& p) const {
   uint32_t ret = FXSYS_UINT32_GET_MSBFIRST(p);
   p += 4;
   return ret;
 }
 
-void CFX_CTTGSUBTable::Parse(FT_Bytes scriptlist,
-                             FT_Bytes featurelist,
-                             FT_Bytes lookuplist) {
+void CFX_CTTGSUBTable::Parse(const uint8_t* scriptlist,
+                             const uint8_t* featurelist,
+                             const uint8_t* lookuplist) {
   ParseScriptList(scriptlist);
   ParseFeatureList(featurelist);
   ParseLookupList(lookuplist);
 }
 
-void CFX_CTTGSUBTable::ParseScriptList(FT_Bytes raw) {
-  FT_Bytes sp = raw;
+void CFX_CTTGSUBTable::ParseScriptList(const uint8_t* raw) {
+  const uint8_t* sp = raw;
   script_list_ = std::vector<ScriptRecord>(GetUInt16(sp));
   for (auto& script : script_list_) {
     // Skip over "ScriptTag" field.
@@ -194,9 +194,10 @@
   }
 }
 
-CFX_CTTGSUBTable::ScriptRecord CFX_CTTGSUBTable::ParseScript(FT_Bytes raw) {
+CFX_CTTGSUBTable::ScriptRecord CFX_CTTGSUBTable::ParseScript(
+    const uint8_t* raw) {
   // Skip over "DefaultLangSys" field.
-  FT_Bytes sp = raw + 2;
+  const uint8_t* sp = raw + 2;
   ScriptRecord result(GetUInt16(sp));
   for (auto& record : result) {
     // Skip over "LangSysTag" field.
@@ -206,9 +207,10 @@
   return result;
 }
 
-CFX_CTTGSUBTable::FeatureIndices CFX_CTTGSUBTable::ParseLangSys(FT_Bytes raw) {
+CFX_CTTGSUBTable::FeatureIndices CFX_CTTGSUBTable::ParseLangSys(
+    const uint8_t* raw) {
   // Skip over "LookupOrder" and "ReqFeatureIndex" fields.
-  FT_Bytes sp = raw + 4;
+  const uint8_t* sp = raw + 4;
   FeatureIndices result(GetUInt16(sp));
   for (auto& element : result) {
     element = GetUInt16(sp);
@@ -216,8 +218,8 @@
   return result;
 }
 
-void CFX_CTTGSUBTable::ParseFeatureList(FT_Bytes raw) {
-  FT_Bytes sp = raw;
+void CFX_CTTGSUBTable::ParseFeatureList(const uint8_t* raw) {
+  const uint8_t* sp = raw;
   feature_list_ = std::vector<FeatureRecord>(GetUInt16(sp));
   for (auto& record : feature_list_) {
     record.feature_tag = GetUInt32(sp);
@@ -227,9 +229,9 @@
 }
 
 DataVector<uint16_t> CFX_CTTGSUBTable::ParseFeatureLookupListIndices(
-    FT_Bytes raw) {
+    const uint8_t* raw) {
   // Skip over "FeatureParams" field.
-  FT_Bytes sp = raw + 2;
+  const uint8_t* sp = raw + 2;
   DataVector<uint16_t> result(GetUInt16(sp));
   for (auto& index : result) {
     index = GetUInt16(sp);
@@ -237,16 +239,16 @@
   return result;
 }
 
-void CFX_CTTGSUBTable::ParseLookupList(FT_Bytes raw) {
-  FT_Bytes sp = raw;
+void CFX_CTTGSUBTable::ParseLookupList(const uint8_t* raw) {
+  const uint8_t* sp = raw;
   lookup_list_ = std::vector<Lookup>(GetUInt16(sp));
   for (auto& lookup : lookup_list_) {
     lookup = ParseLookup(&raw[GetUInt16(sp)]);
   }
 }
 
-CFX_CTTGSUBTable::Lookup CFX_CTTGSUBTable::ParseLookup(FT_Bytes raw) {
-  FT_Bytes sp = raw;
+CFX_CTTGSUBTable::Lookup CFX_CTTGSUBTable::ParseLookup(const uint8_t* raw) {
+  const uint8_t* sp = raw;
   CFX_CTTGSUBTable::Lookup result;
   result.lookup_type = GetUInt16(sp);
   // Skip over "LookupFlag" field.
@@ -262,8 +264,9 @@
   return result;
 }
 
-CFX_CTTGSUBTable::CoverageFormat CFX_CTTGSUBTable::ParseCoverage(FT_Bytes raw) {
-  FT_Bytes sp = raw;
+CFX_CTTGSUBTable::CoverageFormat CFX_CTTGSUBTable::ParseCoverage(
+    const uint8_t* raw) {
+  const uint8_t* sp = raw;
   uint16_t format = GetUInt16(sp);
   if (format != 1 && format != 2) {
     return absl::monostate();
@@ -286,8 +289,9 @@
   return range_records;
 }
 
-CFX_CTTGSUBTable::SubTable CFX_CTTGSUBTable::ParseSingleSubst(FT_Bytes raw) {
-  FT_Bytes sp = raw;
+CFX_CTTGSUBTable::SubTable CFX_CTTGSUBTable::ParseSingleSubst(
+    const uint8_t* raw) {
+  const uint8_t* sp = raw;
   uint16_t format = GetUInt16(sp);
   SubTable rec;
   if (format != 1 && format != 2) {
diff --git a/core/fpdfapi/font/cfx_cttgsubtable.h b/core/fpdfapi/font/cfx_cttgsubtable.h
index ebae880..de55f73 100644
--- a/core/fpdfapi/font/cfx_cttgsubtable.h
+++ b/core/fpdfapi/font/cfx_cttgsubtable.h
@@ -19,7 +19,7 @@
 
 class CFX_CTTGSUBTable {
  public:
-  explicit CFX_CTTGSUBTable(FT_Bytes gsub);
+  explicit CFX_CTTGSUBTable(const uint8_t* gsub);
   ~CFX_CTTGSUBTable();
 
   uint32_t GetVerticalGlyph(uint32_t glyphnum) const;
@@ -77,17 +77,19 @@
     SubTables sub_tables;
   };
 
-  bool LoadGSUBTable(FT_Bytes gsub);
-  void Parse(FT_Bytes scriptlist, FT_Bytes featurelist, FT_Bytes lookuplist);
-  void ParseScriptList(FT_Bytes raw);
-  ScriptRecord ParseScript(FT_Bytes raw);
-  FeatureIndices ParseLangSys(FT_Bytes raw);
-  void ParseFeatureList(FT_Bytes raw);
-  DataVector<uint16_t> ParseFeatureLookupListIndices(FT_Bytes raw);
-  void ParseLookupList(FT_Bytes raw);
-  Lookup ParseLookup(FT_Bytes raw);
-  CoverageFormat ParseCoverage(FT_Bytes raw);
-  SubTable ParseSingleSubst(FT_Bytes raw);
+  bool LoadGSUBTable(const uint8_t* gsub);
+  void Parse(const uint8_t* scriptlist,
+             const uint8_t* featurelist,
+             const uint8_t* lookuplist);
+  void ParseScriptList(const uint8_t* raw);
+  ScriptRecord ParseScript(const uint8_t* raw);
+  FeatureIndices ParseLangSys(const uint8_t* raw);
+  void ParseFeatureList(const uint8_t* raw);
+  DataVector<uint16_t> ParseFeatureLookupListIndices(const uint8_t* raw);
+  void ParseLookupList(const uint8_t* raw);
+  Lookup ParseLookup(const uint8_t* raw);
+  CoverageFormat ParseCoverage(const uint8_t* raw);
+  SubTable ParseSingleSubst(const uint8_t* raw);
 
   absl::optional<uint32_t> GetVerticalGlyphSub(const FeatureRecord& feature,
                                                uint32_t glyphnum) const;
@@ -95,11 +97,11 @@
                                                 uint32_t glyphnum) const;
   int GetCoverageIndex(const CoverageFormat& coverage, uint32_t g) const;
 
-  uint8_t GetUInt8(FT_Bytes& p) const;
-  int16_t GetInt16(FT_Bytes& p) const;
-  uint16_t GetUInt16(FT_Bytes& p) const;
-  int32_t GetInt32(FT_Bytes& p) const;
-  uint32_t GetUInt32(FT_Bytes& p) const;
+  uint8_t GetUInt8(const uint8_t*& p) const;
+  int16_t GetInt16(const uint8_t*& p) const;
+  uint16_t GetUInt16(const uint8_t*& p) const;
+  int32_t GetInt32(const uint8_t*& p) const;
+  uint32_t GetUInt32(const uint8_t*& p) const;
 
   std::set<uint32_t> feature_set_;
   std::vector<ScriptRecord> script_list_;