Split off CPDF_Parser and CPDF_SimpleParser into .h/.cpp files

core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.h

+// Copyright 2016 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
+
+#ifndef CORE_SRC_FPDFAPI_FPDF_PARSER_FPDF_PARSER_UTILITY_H_
+#define CORE_SRC_FPDFAPI_FPDF_PARSER_FPDF_PARSER_UTILITY_H_
+
+#include "core/include/fxcrt/fx_string.h"
+#include "core/include/fxcrt/fx_system.h"
+
+class IFX_FileRead;
+class CPDF_Dictionary;
+
+// Use the accessors below instead of directly accessing PDF_CharType.
+extern const char PDF_CharType[256];
+
+inline bool PDFCharIsWhitespace(uint8_t c) {
+  return PDF_CharType[c] == 'W';
+}
+inline bool PDFCharIsNumeric(uint8_t c) {
+  return PDF_CharType[c] == 'N';
+}
+inline bool PDFCharIsDelimiter(uint8_t c) {
+  return PDF_CharType[c] == 'D';
+}
+inline bool PDFCharIsOther(uint8_t c) {
+  return PDF_CharType[c] == 'R';
+}
+
+inline bool PDFCharIsLineEnding(uint8_t c) {
+  return c == '\r' || c == '\n';
+}
+
+int32_t GetHeaderOffset(IFX_FileRead* pFile);
+int32_t GetDirectInteger(CPDF_Dictionary* pDict, const CFX_ByteStringC& key);
+
+#endif  // CORE_SRC_FPDFAPI_FPDF_PARSER_FPDF_PARSER_UTILITY_H_