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// 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.
#include <iosfwd>
#include <vector>
#include "core/fxcrt/bytestring.h"
#include "core/fxcrt/retain_ptr.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
class CPDF_Array;
class CPDF_Dictionary;
class CPDF_Object;
class IFX_SeekableReadStream;
// 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';
// On success, return a positive offset value to the PDF header. If the header
// cannot be found, or if there is an error reading from |pFile|, then return
// nullopt.
absl::optional<FX_FILESIZE> GetHeaderOffset(
const RetainPtr<IFX_SeekableReadStream>& pFile);
int32_t GetDirectInteger(const CPDF_Dictionary* pDict, const ByteString& key);
CPDF_Array* GetOrCreateArray(CPDF_Dictionary* dict, const ByteString& key);
CPDF_Dictionary* GetOrCreateDict(CPDF_Dictionary* dict, const ByteString& key);
ByteString PDF_NameDecode(ByteStringView orig);
ByteString PDF_NameEncode(const ByteString& orig);
// Return |nCount| elements from |pArray| as a vector of floats. |pArray| must
// have at least |nCount| elements.
std::vector<float> ReadArrayElementsToVector(const CPDF_Array* pArray,
size_t nCount);
// Returns true if |dict| is non-null and has a /Type name entry that matches
// |type|.
bool ValidateDictType(const CPDF_Dictionary* dict, ByteStringView type);
// Returns true if |dict| is non-null and all entries in |dict| are dictionaries
// of |type|.
bool ValidateDictAllResourcesOfType(const CPDF_Dictionary* dict,
ByteStringView type);
// Shorthand for ValidateDictAllResourcesOfType(dict, "Font").
bool ValidateFontResourceDict(const CPDF_Dictionary* dict);
// Like ValidateDictType(), but /Type can also not exist.
bool ValidateDictOptionalType(const CPDF_Dictionary* dict, ByteStringView type);
std::ostream& operator<<(std::ostream& buf, const CPDF_Object* pObj);