Get rid of NULLs in core/

core/fxcodec/codec/fx_codec_png.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 <algorithm>
 
 #include "core/fxcodec/codec/codec_int.h"
 #include "core/fxcodec/include/fx_codec.h"
@@ skipping 92 matching lines @@
 extern "C" {
 static void* _png_alloc_func(unsigned int size) {
   return FX_Alloc(char, size);
 }
 static void _png_free_func(void* p) {
   FX_Free(p);
 }
 };
 static void _png_get_header_func(png_structp png_ptr, png_infop info_ptr) {
   FXPNG_Context* p = (FXPNG_Context*)png_get_progressive_ptr(png_ptr);
-  if (p == NULL) {
+  if (!p)
     return;
-  }
+
   CCodec_PngModule* pModule = (CCodec_PngModule*)p->parent_ptr;
-  if (pModule == NULL) {
+  if (!pModule)
     return;
-  }
+
   png_uint_32 width = 0, height = 0;
   int bpc = 0, color_type = 0, color_type1 = 0, pass = 0;
   double gamma = 1.0;
   png_get_IHDR(png_ptr, info_ptr, &width, &height, &bpc, &color_type, NULL,
                NULL, NULL);
   color_type1 = color_type;
   if (bpc > 8) {
     png_set_strip_16(png_ptr);
   } else if (bpc < 8) {
     png_set_expand_gray_1_2_4_to_8(png_ptr);
@@ skipping 45 matching lines @@
     png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
   }
   png_read_update_info(png_ptr, info_ptr);
 }
 static void _png_get_end_func(png_structp png_ptr, png_infop info_ptr) {}
 static void _png_get_row_func(png_structp png_ptr,
                               png_bytep new_row,
                               png_uint_32 row_num,
                               int pass) {
   FXPNG_Context* p = (FXPNG_Context*)png_get_progressive_ptr(png_ptr);
-  if (p == NULL) {
+  if (!p)
     return;
-  }
+
   CCodec_PngModule* pModule = (CCodec_PngModule*)p->parent_ptr;
   uint8_t* src_buf = NULL;
   if (!pModule->AskScanlineBufCallback(p->child_ptr, row_num, src_buf)) {
     png_error(png_ptr, "Ask Scanline buffer Callback Error");
   }
   if (src_buf) {
     png_progressive_combine_row(png_ptr, src_buf, new_row);
   }
   pModule->FillScanlineBufCompletedCallback(p->child_ptr, pass, row_num);
 }
@@ skipping 49 matching lines @@
   if (setjmp(png_jmpbuf(ctx->png_ptr))) {
     if (pAttribute &&
         0 == FXSYS_strcmp(m_szLastError, "Read Header Callback Error")) {
       _png_load_bmp_attribute(ctx->png_ptr, ctx->info_ptr, pAttribute);
     }
     return FALSE;
   }
   png_process_data(ctx->png_ptr, ctx->info_ptr, (uint8_t*)src_buf, src_size);
   return TRUE;
 }