Fix some code which causes warnings when compiled by /analyze tool

The code may not cause error conditions, but can be improved. These
warnings include uninitialized variables, signed/unsigned mismatch,
redundant condition, and using bool in arithmetic operations.
Also remove a chunk of unused code.

BUG=chromium:613623, chromium:427616

Review-Url: https://codereview.chromium.org/2036203004

5 files changed, 5 insertions, 107 deletions

diff --git a/core/fpdfapi/fpdf_parser/fpdf_parser_decode_embeddertest.cpp b/core/fpdfapi/fpdf_parser/fpdf_parser_decode_embeddertest.cpp
index 4fd26b9153..308c9f11c9 100644
--- a/core/fpdfapi/fpdf_parser/fpdf_parser_decode_embeddertest.cpp
+++ b/core/fpdfapi/fpdf_parser/fpdf_parser_decode_embeddertest.cpp
@@ -73,7 +73,7 @@ TEST_F(FPDFParserDecodeEmbeddertest, FlateDecode) {
 
   for (size_t i = 0; i < FX_ArraySize(flate_decode_cases); ++i) {
     const pdfium::DecodeTestData& data = flate_decode_cases[i];
-    unsigned char* result;
+    unsigned char* result = nullptr;
     unsigned int result_size;
     EXPECT_EQ(data.processed_size,
               FlateDecode(data.input, data.input_size, result, result_size))
diff --git a/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp b/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
index 352e4ee15c..cd96c4a72a 100644
--- a/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
+++ b/core/fpdfapi/fpdf_parser/fpdf_parser_decode_unittest.cpp
@@ -29,7 +29,7 @@ TEST(fpdf_parser_decode, A85Decode) {
   for (size_t i = 0; i < FX_ArraySize(test_data); ++i) {
     pdfium::DecodeTestData* ptr = &test_data[i];
     uint8_t* result = nullptr;
-    uint32_t result_size;
+    uint32_t result_size = 0;
     EXPECT_EQ(ptr->processed_size,
               A85Decode(ptr->input, ptr->input_size, result, result_size))
         << "for case " << i;
@@ -64,7 +64,7 @@ TEST(fpdf_parser_decode, HexDecode) {
   for (size_t i = 0; i < FX_ArraySize(test_data); ++i) {
     pdfium::DecodeTestData* ptr = &test_data[i];
     uint8_t* result = nullptr;
-    uint32_t result_size;
+    uint32_t result_size = 0;
     EXPECT_EQ(ptr->processed_size,
               HexDecode(ptr->input, ptr->input_size, result, result_size))
         << "for case " << i;
diff --git a/core/fxcodec/codec/fx_codec.cpp b/core/fxcodec/codec/fx_codec.cpp
index f0f03ab0e9..997d61f25b 100644
--- a/core/fxcodec/codec/fx_codec.cpp
+++ b/core/fxcodec/codec/fx_codec.cpp
@@ -84,108 +84,6 @@ FX_BOOL CCodec_BasicModule::RunLengthEncode(const uint8_t* src_buf,
   return FALSE;
 }
 
-#define EXPONENT_DETECT(ptr)                 \
-  for (;; ptr++) {                           \
-    if (!std::isdigit(*ptr)) {               \
-      if (endptr)                            \
-        *endptr = (char*)ptr;                \
-      break;                                 \
-    } else {                                 \
-      exp_ret *= 10;                         \
-      exp_ret += FXSYS_toDecimalDigit(*ptr); \
-      continue;                              \
-    }                                        \
-  }
-
-extern "C" double FXstrtod(const char* nptr, char** endptr) {
-  double ret = 0.0;
-  const char* ptr = nptr;
-  const char* exp_ptr = NULL;
-  int e_number = 0, e_signal = 0, e_point = 0, is_negative = 0;
-  int exp_ret = 0, exp_sig = 1, fra_ret = 0, fra_count = 0, fra_base = 1;
-  if (!nptr) {
-    return 0.0;
-  }
-  for (;; ptr++) {
-    if (!e_number && !e_point && (*ptr == '\t' || *ptr == ' '))
-      continue;
-
-    if (std::isdigit(*ptr)) {
-      if (!e_number)
-        e_number = 1;
-
-      if (!e_point) {
-        ret *= 10;
-        ret += FXSYS_toDecimalDigit(*ptr);
-      } else {
-        fra_count++;
-        fra_ret *= 10;
-        fra_ret += FXSYS_toDecimalDigit(*ptr);
-      }
-      continue;
-    }
-    if (!e_point && *ptr == '.') {
-      e_point = 1;
-      continue;
-    }
-    if (!e_number && !e_point && !e_signal) {
-      switch (*ptr) {
-        case '-':
-          is_negative = 1;
-        case '+':
-          e_signal = 1;
-          continue;
-      }
-    }
-    if (e_number && (*ptr == 'e' || *ptr == 'E')) {
-      exp_ptr = ptr++;
-      if (*ptr == '+' || *ptr == '-') {
-        exp_sig = (*ptr++ == '+') ? 1 : -1;
-        if (!std::isdigit(*ptr)) {
-          if (endptr) {
-            *endptr = (char*)exp_ptr;
-          }
-          break;
-        }
-        EXPONENT_DETECT(ptr);
-      } else if (std::isdigit(*ptr)) {
-        EXPONENT_DETECT(ptr);
-      } else {
-        if (endptr) {
-          *endptr = (char*)exp_ptr;
-        }
-        break;
-      }
-      break;
-    }
-    if (ptr != nptr && !e_number) {
-      if (endptr) {
-        *endptr = (char*)nptr;
-      }
-      break;
-    }
-    if (endptr) {
-      *endptr = (char*)ptr;
-    }
-    break;
-  }
-  while (fra_count--) {
-    fra_base *= 10;
-  }
-  ret += (double)fra_ret / (double)fra_base;
-  if (exp_sig == 1) {
-    while (exp_ret--) {
-      ret *= 10.0;
-    }
-  } else {
-    while (exp_ret--) {
-      ret /= 10.0;
-    }
-  }
-  return is_negative ? -ret : ret;
-}
-#undef EXPONENT_DETECT
-
 FX_BOOL CCodec_BasicModule::A85Encode(const uint8_t* src_buf,
                                       uint32_t src_size,
                                       uint8_t*& dest_buf,
diff --git a/core/fxcodec/codec/fx_codec_png.cpp b/core/fxcodec/codec/fx_codec_png.cpp
index 61d4cebdbb..f7b922973e 100644
--- a/core/fxcodec/codec/fx_codec_png.cpp
+++ b/core/fxcodec/codec/fx_codec_png.cpp
@@ -56,7 +56,7 @@ static void _png_load_bmp_attribute(png_structp png_ptr,
     if (t) {
       FXSYS_memset(pAttribute->m_strTime, 0, sizeof(pAttribute->m_strTime));
       FXSYS_snprintf((FX_CHAR*)pAttribute->m_strTime,
-                     sizeof(pAttribute->m_strTime), "%4d:%2d:%2d %2d:%2d:%2d",
+                     sizeof(pAttribute->m_strTime), "%4u:%2u:%2u %2u:%2u:%2u",
                      t->year, t->month, t->day, t->hour, t->minute, t->second);
       pAttribute->m_strTime[sizeof(pAttribute->m_strTime) - 1] = 0;
       bTime = 1;
diff --git a/core/fxcodec/jbig2/JBig2_Context.cpp b/core/fxcodec/jbig2/JBig2_Context.cpp
index a0a411fbcf..25c9ff7649 100644
--- a/core/fxcodec/jbig2/JBig2_Context.cpp
+++ b/core/fxcodec/jbig2/JBig2_Context.cpp
@@ -631,7 +631,7 @@ int32_t CJBig2_Context::parseSymbolDict(CJBig2_Segment* pSegment,
         return JBIG2_ERROR_FATAL;
       m_pStream->alignByte();
     }
-    if (m_bIsGlobal && kSymbolDictCacheMaxSize > 0) {
+    if (m_bIsGlobal) {
       std::unique_ptr<CJBig2_SymbolDict> value =
           pSegment->m_Result.sd->DeepCopy();
       int size = pdfium::CollectionSize<int>(*m_pSymbolDictCache);