Clean up QRCoderBitVector.

Use std::vector and return booleans results when possible.

Change-Id: If3ce4559f137fb449fd1ab818750558a1b5f8df0
Reviewed-on: https://pdfium-review.googlesource.com/3561
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

5 files changed, 129 insertions, 198 deletions

diff --git a/fxbarcode/qrcode/BC_QRCoderBitVector.cpp b/fxbarcode/qrcode/BC_QRCoderBitVector.cpp
index 2e3c341792..7a41ad0910 100644
--- a/fxbarcode/qrcode/BC_QRCoderBitVector.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderBitVector.cpp
@@ -20,45 +20,34 @@
  * limitations under the License.
  */
 
-#include "core/fxcrt/fx_memory.h"
 #include "fxbarcode/qrcode/BC_QRCoderBitVector.h"
+
+#include "core/fxcrt/fx_memory.h"
 #include "fxbarcode/utils.h"
 
-CBC_QRCoderBitVector::CBC_QRCoderBitVector() {
-  m_sizeInBits = 0;
-  m_size = 32;
-}
-void CBC_QRCoderBitVector::Init() {
-  m_array = FX_Alloc(uint8_t, m_size);
-}
-CBC_QRCoderBitVector::~CBC_QRCoderBitVector() {
-  FX_Free(m_array);
-}
-void CBC_QRCoderBitVector::Clear() {
-  FX_Free(m_array);
-  m_sizeInBits = 0;
-  m_size = 32;
-  m_array = FX_Alloc(uint8_t, m_size);
-}
-int32_t CBC_QRCoderBitVector::At(int32_t index, int32_t& e) {
-  if (index < 0 || index >= m_sizeInBits) {
+CBC_QRCoderBitVector::CBC_QRCoderBitVector() {}
+
+CBC_QRCoderBitVector::~CBC_QRCoderBitVector() {}
+
+int32_t CBC_QRCoderBitVector::At(size_t index, int32_t& e) const {
+  if (index >= m_sizeInBits) {
     e = BCExceptionBadIndexException;
     return 0;
   }
   int32_t value = m_array[index >> 3] & 0xff;
   return (value >> (7 - (index & 0x7))) & 1;
 }
-int32_t CBC_QRCoderBitVector::sizeInBytes() {
+
+size_t CBC_QRCoderBitVector::sizeInBytes() const {
   return (m_sizeInBits + 7) >> 3;
 }
-int32_t CBC_QRCoderBitVector::Size() {
+
+size_t CBC_QRCoderBitVector::Size() const {
   return m_sizeInBits;
 }
-void CBC_QRCoderBitVector::AppendBit(int32_t bit, int32_t& e) {
-  if (!(bit == 0 || bit == 1)) {
-    e = BCExceptionBadValueException;
-    return;
-  }
+
+void CBC_QRCoderBitVector::AppendBit(int32_t bit) {
+  ASSERT(bit == 0 || bit == 1);
   int32_t numBitsInLastByte = m_sizeInBits & 0x7;
   if (numBitsInLastByte == 0) {
     AppendByte(0);
@@ -67,61 +56,50 @@ void CBC_QRCoderBitVector::AppendBit(int32_t bit, int32_t& e) {
   m_array[m_sizeInBits >> 3] |= (bit << (7 - numBitsInLastByte));
   ++m_sizeInBits;
 }
-void CBC_QRCoderBitVector::AppendBits(int32_t value,
-                                      int32_t numBits,
-                                      int32_t& e) {
-  if (numBits < 0 || numBits > 32) {
-    e = BCExceptionBadNumBitsException;
-    return;
-  }
+
+void CBC_QRCoderBitVector::AppendBits(int32_t value, int32_t numBits) {
+  ASSERT(numBits > 0);
+  ASSERT(numBits <= 32);
+
   int32_t numBitsLeft = numBits;
   while (numBitsLeft > 0) {
     if ((m_sizeInBits & 0x7) == 0 && numBitsLeft >= 8) {
-      int32_t newByte = (value >> (numBitsLeft - 8)) & 0xff;
-      AppendByte(newByte);
+      AppendByte(static_cast<int8_t>((value >> (numBitsLeft - 8)) & 0xff));
       numBitsLeft -= 8;
     } else {
-      int32_t bit = (value >> (numBitsLeft - 1)) & 1;
-      AppendBit(bit, e);
-      if (e != BCExceptionNO)
-        return;
+      AppendBit((value >> (numBitsLeft - 1)) & 1);
       --numBitsLeft;
     }
   }
 }
-void CBC_QRCoderBitVector::AppendBitVector(CBC_QRCoderBitVector* bits,
-                                           int32_t& e) {
+
+void CBC_QRCoderBitVector::AppendBitVector(CBC_QRCoderBitVector* bits) {
   int32_t size = bits->Size();
   for (int32_t i = 0; i < size; i++) {
+    int e = BCExceptionNO;
     int32_t num = bits->At(i, e);
-    if (e != BCExceptionNO)
-      return;
-    AppendBit(num, e);
-    if (e != BCExceptionNO)
-      return;
+    ASSERT(e == BCExceptionNO);
+    AppendBit(num);
   }
 }
-void CBC_QRCoderBitVector::XOR(CBC_QRCoderBitVector* other, int32_t& e) {
-  if (m_sizeInBits != other->Size()) {
-    e = BCExceptioncanNotOperatexorOperator;
-    return;
-  }
-  int32_t sizeInBytes = (m_sizeInBits + 7) >> 3;
-  for (int32_t i = 0; i < sizeInBytes; ++i) {
-    m_array[i] ^= (other->GetArray())[i];
-  }
+
+bool CBC_QRCoderBitVector::XOR(const CBC_QRCoderBitVector* other) {
+  if (m_sizeInBits != other->Size())
+    return false;
+
+  const auto* pOther = other->GetArray();
+  for (size_t i = 0; i < sizeInBytes(); ++i)
+    m_array[i] ^= pOther[i];
+  return true;
 }
-uint8_t* CBC_QRCoderBitVector::GetArray() {
-  return m_array;
+
+const uint8_t* CBC_QRCoderBitVector::GetArray() const {
+  return m_array.data();
 }
-void CBC_QRCoderBitVector::AppendByte(int32_t value) {
-  if ((m_sizeInBits >> 3) == m_size) {
-    uint8_t* newArray = FX_Alloc(uint8_t, m_size << 1);
-    memcpy(newArray, m_array, m_size);
-    FX_Free(m_array);
-    m_array = newArray;
-    m_size = m_size << 1;
-  }
-  m_array[m_sizeInBits >> 3] = (uint8_t)value;
+
+void CBC_QRCoderBitVector::AppendByte(int8_t value) {
+  if ((m_sizeInBits >> 3) == m_array.size())
+    m_array.push_back(0);
+  m_array[m_sizeInBits >> 3] = value;
   m_sizeInBits += 8;
 }
diff --git a/fxbarcode/qrcode/BC_QRCoderBitVector.h b/fxbarcode/qrcode/BC_QRCoderBitVector.h
index 59c4360c1e..0ebeb60ab8 100644
--- a/fxbarcode/qrcode/BC_QRCoderBitVector.h
+++ b/fxbarcode/qrcode/BC_QRCoderBitVector.h
@@ -7,29 +7,31 @@
 #ifndef FXBARCODE_QRCODE_BC_QRCODERBITVECTOR_H_
 #define FXBARCODE_QRCODE_BC_QRCODERBITVECTOR_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
-class CBC_QRCoderBitVector {
- private:
-  int32_t m_sizeInBits;
-  uint8_t* m_array;
-  int32_t m_size;
-
-  void AppendByte(int32_t value);
+#include <vector>
 
+class CBC_QRCoderBitVector {
  public:
   CBC_QRCoderBitVector();
-  virtual ~CBC_QRCoderBitVector();
-  int32_t At(int32_t index, int32_t& e);
-  int32_t Size();
-  int32_t sizeInBytes();
-  void AppendBit(int32_t bit, int32_t& e);
-  void AppendBits(int32_t value, int32_t numBits, int32_t& e);
-  void AppendBitVector(CBC_QRCoderBitVector* bits, int32_t& e);
-  void XOR(CBC_QRCoderBitVector* other, int32_t& e);
-  uint8_t* GetArray();
-  void Clear();
-  virtual void Init();
+  ~CBC_QRCoderBitVector();
+
+  const uint8_t* GetArray() const;
+  int32_t At(size_t index, int32_t& e) const;
+  size_t Size() const;
+  size_t sizeInBytes() const;
+
+  void AppendBit(int32_t bit);
+  void AppendBits(int32_t value, int32_t numBits);
+  void AppendBitVector(CBC_QRCoderBitVector* bits);
+  bool XOR(const CBC_QRCoderBitVector* other);
+
+ private:
+  void AppendByte(int8_t value);
+
+  size_t m_sizeInBits = 0;
+  std::vector<uint8_t> m_array;
 };
 
 #endif  // FXBARCODE_QRCODE_BC_QRCODERBITVECTOR_H_
diff --git a/fxbarcode/qrcode/BC_QRCoderEncoder.cpp b/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
index 285bd0a541..d74063d3fe 100644
--- a/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderEncoder.cpp
@@ -73,20 +73,14 @@ void AppendNumericBytes(const CFX_ByteString& content,
     if (i + 2 < length) {
       int32_t num2 = content[i + 1] - '0';
       int32_t num3 = content[i + 2] - '0';
-      bits->AppendBits(num1 * 100 + num2 * 10 + num3, 10, e);
-      if (e != BCExceptionNO)
-        return;
+      bits->AppendBits(num1 * 100 + num2 * 10 + num3, 10);
       i += 3;
     } else if (i + 1 < length) {
       int32_t num2 = content[i + 1] - '0';
-      bits->AppendBits(num1 * 10 + num2, 7, e);
-      if (e != BCExceptionNO)
-        return;
+      bits->AppendBits(num1 * 10 + num2, 7);
       i += 2;
     } else {
-      bits->AppendBits(num1, 4, e);
-      if (e != BCExceptionNO)
-        return;
+      bits->AppendBits(num1, 4);
       i++;
     }
   }
@@ -109,14 +103,10 @@ void AppendAlphaNumericBytes(const CFX_ByteString& content,
         e = BCExceptionInvalidateCharacter;
         return;
       }
-      bits->AppendBits(code1 * 45 + code2, 11, e);
-      if (e != BCExceptionNO)
-        return;
+      bits->AppendBits(code1 * 45 + code2, 11);
       i += 2;
     } else {
-      bits->AppendBits(code1, 6, e);
-      if (e != BCExceptionNO)
-        return;
+      bits->AppendBits(code1, 6);
       i++;
     }
   }
@@ -138,9 +128,7 @@ void AppendGBKBytes(const CFX_ByteString& content,
       return;
     }
     value = (uint32_t)((value >> 8) * 0x60) + (uint32_t)(value & 0xff);
-    bits->AppendBits(value, 13, e);
-    if (e != BCExceptionNO)
-      return;
+    bits->AppendBits(value, 13);
   }
 }
 
@@ -148,11 +136,8 @@ void Append8BitBytes(const CFX_ByteString& content,
                      CBC_QRCoderBitVector* bits,
                      CFX_ByteString encoding,
                      int32_t& e) {
-  for (int32_t i = 0; i < content.GetLength(); i++) {
-    bits->AppendBits(content[i], 8, e);
-    if (e != BCExceptionNO)
-      return;
-  }
+  for (int32_t i = 0; i < content.GetLength(); i++)
+    bits->AppendBits(content[i], 8);
 }
 
 void AppendKanjiBytes(const CFX_ByteString& content,
@@ -171,40 +156,34 @@ void AppendKanjiBytes(const CFX_ByteString& content,
       return;
     }
     value = (uint32_t)((value >> 8) * 0xc0) + (uint32_t)(value & 0xff);
-    bits->AppendBits(value, 13, e);
-    if (e != BCExceptionNO)
-      return;
+    bits->AppendBits(value, 13);
   }
 }
 
-void AppendModeInfo(CBC_QRCoderMode* mode,
-                    CBC_QRCoderBitVector* bits,
-                    int32_t& e) {
-  bits->AppendBits(mode->GetBits(), 4, e);
+void AppendModeInfo(CBC_QRCoderMode* mode, CBC_QRCoderBitVector* bits) {
+  bits->AppendBits(mode->GetBits(), 4);
   if (mode == CBC_QRCoderMode::sGBK)
-    bits->AppendBits(1, 4, e);
+    bits->AppendBits(1, 4);
 }
 
-void AppendLengthInfo(int32_t numLetters,
+bool AppendLengthInfo(int32_t numLetters,
                       int32_t version,
                       CBC_QRCoderMode* mode,
-                      CBC_QRCoderBitVector* bits,
-                      int32_t& e) {
+                      CBC_QRCoderBitVector* bits) {
+  int32_t e = BCExceptionNO;
   CBC_QRCoderVersion* qcv = CBC_QRCoderVersion::GetVersionForNumber(version, e);
   if (e != BCExceptionNO)
-    return;
+    return false;
   int32_t numBits = mode->GetCharacterCountBits(qcv, e);
   if (e != BCExceptionNO)
-    return;
-  if (numBits > ((1 << numBits) - 1)) {
-    return;
-  }
-  if (mode == CBC_QRCoderMode::sGBK) {
-    bits->AppendBits(numLetters / 2, numBits, e);
-    if (e != BCExceptionNO)
-      return;
-  }
-  bits->AppendBits(numLetters, numBits, e);
+    return false;
+  if (numBits > ((1 << numBits) - 1))
+    return true;
+
+  if (mode == CBC_QRCoderMode::sGBK)
+    bits->AppendBits(numLetters / 2, numBits);
+  bits->AppendBits(numLetters, numBits);
+  return true;
 }
 
 void AppendBytes(const CFX_ByteString& content,
@@ -376,35 +355,29 @@ void GetNumDataBytesAndNumECBytesForBlockID(int32_t numTotalBytes,
 void TerminateBits(int32_t numDataBytes,
                    CBC_QRCoderBitVector* bits,
                    int32_t& e) {
-  int32_t capacity = numDataBytes << 3;
+  size_t capacity = numDataBytes << 3;
   if (bits->Size() > capacity) {
     e = BCExceptionDataTooMany;
     return;
   }
-  for (int32_t i = 0; i < 4 && bits->Size() < capacity; ++i) {
-    bits->AppendBit(0, e);
-    if (e != BCExceptionNO)
-      return;
-  }
+
+  for (int32_t i = 0; i < 4 && bits->Size() < capacity; ++i)
+    bits->AppendBit(0);
+
   int32_t numBitsInLastByte = bits->Size() % 8;
   if (numBitsInLastByte > 0) {
     int32_t numPaddingBits = 8 - numBitsInLastByte;
-    for (int32_t j = 0; j < numPaddingBits; ++j) {
-      bits->AppendBit(0, e);
-      if (e != BCExceptionNO)
-        return;
-    }
+    for (int32_t j = 0; j < numPaddingBits; ++j)
+      bits->AppendBit(0);
   }
+
   if (bits->Size() % 8 != 0) {
     e = BCExceptionDigitLengthMustBe8;
     return;
   }
   int32_t numPaddingBytes = numDataBytes - bits->sizeInBytes();
-  for (int32_t k = 0; k < numPaddingBytes; ++k) {
-    bits->AppendBits(k % 2 ? 0x11 : 0xec, 8, e);
-    if (e != BCExceptionNO)
-      return;
-  }
+  for (int32_t k = 0; k < numPaddingBytes; ++k)
+    bits->AppendBits(k % 2 ? 0x11 : 0xec, 8);
   if (bits->Size() != capacity)
     e = BCExceptionBitsNotEqualCacity;
 }
@@ -499,7 +472,7 @@ void SplitString(const CFX_ByteString& content,
   if (index >= content.GetLength())
     return;
 
-  while (index < content.GetLength() && FXSYS_Isdigit(content[index]))
+  while (index < content.GetLength() && isdigit(content[index]))
     ++index;
 
   if (index != flag) {
@@ -552,7 +525,9 @@ void InterleaveWithECBytes(CBC_QRCoderBitVector* bits,
                            int32_t numRSBlocks,
                            CBC_QRCoderBitVector* result,
                            int32_t& e) {
-  if (bits->sizeInBytes() != numDataBytes) {
+  ASSERT(numTotalBytes >= 0);
+  ASSERT(numDataBytes >= 0);
+  if (bits->sizeInBytes() != static_cast<size_t>(numDataBytes)) {
     e = BCExceptionBitsBytesNotMatch;
     return;
   }
@@ -584,24 +559,18 @@ void InterleaveWithECBytes(CBC_QRCoderBitVector* bits,
   for (int32_t x = 0; x < maxNumDataBytes; x++) {
     for (size_t j = 0; j < blocks.size(); j++) {
       const CBC_CommonByteArray* dataBytes = blocks[j].GetDataBytes();
-      if (x < dataBytes->Size()) {
-        result->AppendBits(dataBytes->At(x), 8, e);
-        if (e != BCExceptionNO)
-          return;
-      }
+      if (x < dataBytes->Size())
+        result->AppendBits(dataBytes->At(x), 8);
     }
   }
   for (int32_t y = 0; y < maxNumEcBytes; y++) {
     for (size_t l = 0; l < blocks.size(); l++) {
       const CBC_CommonByteArray* ecBytes = blocks[l].GetErrorCorrectionBytes();
-      if (y < ecBytes->Size()) {
-        result->AppendBits(ecBytes->At(y), 8, e);
-        if (e != BCExceptionNO)
-          return;
-      }
+      if (y < ecBytes->Size())
+        result->AppendBits(ecBytes->At(y), 8);
     }
   }
-  if (numTotalBytes != result->sizeInBytes())
+  if (static_cast<size_t>(numTotalBytes) != result->sizeInBytes())
     e = BCExceptionSizeInBytesDiffer;
 }
 
@@ -620,7 +589,6 @@ void CBC_QRCoderEncoder::Encode(const CFX_WideString& content,
   CBC_UtilCodingConvert::UnicodeToUTF8(content, utf8Data);
   CBC_QRCoderMode* mode = ChooseMode(utf8Data, encoding);
   CBC_QRCoderBitVector dataBits;
-  dataBits.Init();
   AppendBytes(utf8Data, mode, &dataBits, encoding, e);
   if (e != BCExceptionNO)
     return;
@@ -629,24 +597,19 @@ void CBC_QRCoderEncoder::Encode(const CFX_WideString& content,
   if (e != BCExceptionNO)
     return;
   CBC_QRCoderBitVector headerAndDataBits;
-  headerAndDataBits.Init();
-  AppendModeInfo(mode, &headerAndDataBits, e);
-  if (e != BCExceptionNO)
-    return;
+  AppendModeInfo(mode, &headerAndDataBits);
   int32_t numLetters = mode == CBC_QRCoderMode::sBYTE ? dataBits.sizeInBytes()
                                                       : content.GetLength();
-  AppendLengthInfo(numLetters, qrCode->GetVersion(), mode, &headerAndDataBits,
-                   e);
-  if (e != BCExceptionNO)
-    return;
-  headerAndDataBits.AppendBitVector(&dataBits, e);
-  if (e != BCExceptionNO)
+  if (!AppendLengthInfo(numLetters, qrCode->GetVersion(), mode,
+                        &headerAndDataBits)) {
+    e = BCExceptionGeneric;
     return;
+  }
+  headerAndDataBits.AppendBitVector(&dataBits);
   TerminateBits(qrCode->GetNumDataBytes(), &headerAndDataBits, e);
   if (e != BCExceptionNO)
     return;
   CBC_QRCoderBitVector finalBits;
-  finalBits.Init();
   InterleaveWithECBytes(&headerAndDataBits, qrCode->GetNumTotalBytes(),
                         qrCode->GetNumDataBytes(), qrCode->GetNumRSBlocks(),
                         &finalBits, e);
diff --git a/fxbarcode/qrcode/BC_QRCoderMatrixUtil.cpp b/fxbarcode/qrcode/BC_QRCoderMatrixUtil.cpp
index b6ffaa00fc..b0be2b6f2a 100644
--- a/fxbarcode/qrcode/BC_QRCoderMatrixUtil.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderMatrixUtil.cpp
@@ -130,6 +130,7 @@ void CBC_QRCoderMatrixUtil::EmbedBasicPatterns(int32_t version,
   if (e != BCExceptionNO)
     return;
 }
+
 void CBC_QRCoderMatrixUtil::EmbedTypeInfo(
     CBC_QRCoderErrorCorrectionLevel* ecLevel,
     int32_t maskPattern,
@@ -140,11 +141,11 @@ void CBC_QRCoderMatrixUtil::EmbedTypeInfo(
     return;
   }
   CBC_QRCoderBitVector typeInfoBits;
-  typeInfoBits.Init();
   MakeTypeInfoBits(ecLevel, maskPattern, &typeInfoBits, e);
   if (e != BCExceptionNO)
     return;
-  for (int32_t i = 0; i < typeInfoBits.Size(); i++) {
+
+  for (size_t i = 0; i < typeInfoBits.Size(); i++) {
     int32_t bit = typeInfoBits.At(typeInfoBits.Size() - 1 - i, e);
     if (e != BCExceptionNO)
       return;
@@ -162,6 +163,7 @@ void CBC_QRCoderMatrixUtil::EmbedTypeInfo(
     }
   }
 }
+
 void CBC_QRCoderMatrixUtil::MaybeEmbedVersionInfo(int32_t version,
                                                   CBC_CommonByteMatrix* matrix,
                                                   int32_t& e) {
@@ -173,7 +175,6 @@ void CBC_QRCoderMatrixUtil::MaybeEmbedVersionInfo(int32_t version,
     return;
   }
   CBC_QRCoderBitVector versionInfoBits;
-  versionInfoBits.Init();
   MakeVersionInfoBits(version, &versionInfoBits, e);
   if (e != BCExceptionNO)
     return;
@@ -197,7 +198,7 @@ void CBC_QRCoderMatrixUtil::EmbedDataBits(CBC_QRCoderBitVector* dataBits,
     e = BCExceptionNullPointer;
     return;
   }
-  int32_t bitIndex = 0;
+  size_t bitIndex = 0;
   int32_t direction = -1;
   int32_t x = matrix->GetWidth() - 1;
   int32_t y = matrix->GetHeight() - 1;
@@ -266,23 +267,16 @@ void CBC_QRCoderMatrixUtil::MakeTypeInfoBits(
     return;
   }
   int32_t typeInfo = (ecLevel->GetBits() << 3) | maskPattern;
-  if (e != BCExceptionNO)
-    return;
-  bits->AppendBits(typeInfo, 5, e);
+  bits->AppendBits(typeInfo, 5);
   int32_t bchCode = CalculateBCHCode(typeInfo, TYPE_INFO_POLY);
-  if (e != BCExceptionNO)
-    return;
-  bits->AppendBits(bchCode, 10, e);
+  bits->AppendBits(bchCode, 10);
   CBC_QRCoderBitVector maskBits;
-  maskBits.Init();
-  maskBits.AppendBits(TYPE_INFO_MASK_PATTERN, 15, e);
-  if (e != BCExceptionNO)
+  maskBits.AppendBits(TYPE_INFO_MASK_PATTERN, 15);
+  if (!bits->XOR(&maskBits)) {
+    e = BCExceptionGeneric;
     return;
-  bits->XOR(&maskBits, e);
-  if (e != BCExceptionNO)
-    return;
-  if (bits->Size() != 15)
-    e = BCExceptionBitSizeNot15;
+  }
+  ASSERT(bits->Size() == 15);
 }
 
 void CBC_QRCoderMatrixUtil::MakeVersionInfoBits(int32_t version,
@@ -292,17 +286,11 @@ void CBC_QRCoderMatrixUtil::MakeVersionInfoBits(int32_t version,
     e = BCExceptionNullPointer;
     return;
   }
-  bits->AppendBits(version, 6, e);
-  if (e != BCExceptionNO)
-    return;
 
+  bits->AppendBits(version, 6);
   int32_t bchCode = CalculateBCHCode(version, VERSION_INFO_POLY);
-  bits->AppendBits(bchCode, 12, e);
-  if (e != BCExceptionNO)
-    return;
-
-  if (bits->Size() != 18)
-    e = BCExceptionBitSizeNot18;
+  bits->AppendBits(bchCode, 12);
+  ASSERT(bits->Size() == 18);
 }
 
 bool CBC_QRCoderMatrixUtil::IsEmpty(int32_t value) {
diff --git a/fxbarcode/qrcode/BC_QRCoderVersion.cpp b/fxbarcode/qrcode/BC_QRCoderVersion.cpp
index ff7cbc4007..f0b708dfc3 100644
--- a/fxbarcode/qrcode/BC_QRCoderVersion.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderVersion.cpp
@@ -382,7 +382,7 @@ CBC_QRCoderVersion* CBC_QRCoderVersion::GetProvisionalVersionForDimension(
 CBC_QRCoderVersion* CBC_QRCoderVersion::DecodeVersionInformation(
     int32_t versionBits,
     int32_t& e) {
-  int32_t bestDifference = FXSYS_IntMax;
+  int32_t bestDifference = INT_MAX;
   int32_t bestVersion = 0;
   for (int32_t i = 0; i < 34; i++) {
     int32_t targetVersion = VERSION_DECODE_INFO[i];