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-rw-r--r--core/fpdfapi/parser/cpdf_parser.cpp69
-rw-r--r--core/fpdfapi/parser/cpdf_parser.h12
2 files changed, 40 insertions, 41 deletions
diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index da51eb1c83..d35f034e97 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -34,6 +34,8 @@ namespace {
// this may be large enough in practice.
const int32_t kMaxXRefSize = 1048576;
+constexpr FX_FILESIZE kPDFHeaderSize = 9;
+
uint32_t GetVarInt(const uint8_t* p, int32_t n) {
uint32_t result = 0;
for (int32_t i = 0; i < n; ++i)
@@ -145,47 +147,48 @@ void CPDF_Parser::ShrinkObjectMap(uint32_t objnum) {
m_ObjectInfo[objnum - 1].pos = 0;
}
-CPDF_Parser::Error CPDF_Parser::StartParse(
- const CFX_RetainPtr<IFX_SeekableReadStream>& pFileAccess,
- CPDF_Document* pDocument) {
- return StartParseInternal(pFileAccess, pDocument, kInvalidHeaderOffset);
-}
-
-CPDF_Parser::Error CPDF_Parser::StartParseInternal(
- const CFX_RetainPtr<IFX_SeekableReadStream>& pFileAccess,
- CPDF_Document* pDocument,
- int32_t iHeaderOffset) {
- ASSERT(!m_bHasParsed);
- m_bHasParsed = true;
- m_bXRefStream = false;
- m_LastXRefOffset = 0;
-
- int32_t offset;
- if (iHeaderOffset == kInvalidHeaderOffset) {
- offset = GetHeaderOffset(pFileAccess);
- if (offset == kInvalidHeaderOffset)
- return FORMAT_ERROR;
- } else {
- offset = iHeaderOffset;
- }
+bool CPDF_Parser::InitSyntaxParser(
+ const CFX_RetainPtr<IFX_SeekableReadStream>& file_access) {
+ const int32_t header_offset = GetHeaderOffset(file_access);
+ if (header_offset == kInvalidHeaderOffset)
+ return false;
+ if (file_access->GetSize() < header_offset + kPDFHeaderSize)
+ return false;
- m_pSyntax->InitParser(pFileAccess, offset);
+ m_pSyntax->InitParser(file_access, header_offset);
+ return ParseFileVersion();
+}
+bool CPDF_Parser::ParseFileVersion() {
+ m_FileVersion = 0;
uint8_t ch;
if (!m_pSyntax->GetCharAt(5, ch))
- return FORMAT_ERROR;
+ return false;
if (std::isdigit(ch))
m_FileVersion = FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch)) * 10;
if (!m_pSyntax->GetCharAt(7, ch))
- return FORMAT_ERROR;
+ return false;
if (std::isdigit(ch))
m_FileVersion += FXSYS_DecimalCharToInt(static_cast<wchar_t>(ch));
+ return true;
+}
- if (m_pSyntax->m_FileLen < m_pSyntax->m_HeaderOffset + 9)
+CPDF_Parser::Error CPDF_Parser::StartParse(
+ const CFX_RetainPtr<IFX_SeekableReadStream>& pFileAccess,
+ CPDF_Document* pDocument) {
+ if (!InitSyntaxParser(pFileAccess))
return FORMAT_ERROR;
+ return StartParseInternal(pDocument);
+}
+
+CPDF_Parser::Error CPDF_Parser::StartParseInternal(CPDF_Document* pDocument) {
+ ASSERT(!m_bHasParsed);
+ m_bHasParsed = true;
+ m_bXRefStream = false;
+ m_LastXRefOffset = 0;
m_pSyntax->SetPos(m_pSyntax->m_FileLen - m_pSyntax->m_HeaderOffset - 9);
m_pDocument = pDocument;
@@ -1348,10 +1351,7 @@ uint32_t CPDF_Parser::GetPermissions() const {
return dwPermission;
}
-bool CPDF_Parser::IsLinearizedFile(
- const CFX_RetainPtr<IFX_SeekableReadStream>& pFileAccess,
- uint32_t offset) {
- m_pSyntax->InitParser(pFileAccess, offset);
+bool CPDF_Parser::ParseLinearizedHeader() {
m_pSyntax->SetPos(m_pSyntax->m_HeaderOffset + 9);
FX_FILESIZE SavedPos = m_pSyntax->GetPos();
@@ -1389,12 +1389,11 @@ CPDF_Parser::Error CPDF_Parser::StartLinearizedParse(
m_bXRefStream = false;
m_LastXRefOffset = 0;
- int32_t offset = GetHeaderOffset(pFileAccess);
- if (offset == kInvalidHeaderOffset)
+ if (!InitSyntaxParser(pFileAccess))
return FORMAT_ERROR;
- if (!IsLinearizedFile(pFileAccess, offset))
- return StartParseInternal(pFileAccess, std::move(pDocument), offset);
+ if (!ParseLinearizedHeader())
+ return StartParseInternal(std::move(pDocument));
m_bHasParsed = true;
m_pDocument = pDocument;
diff --git a/core/fpdfapi/parser/cpdf_parser.h b/core/fpdfapi/parser/cpdf_parser.h
index fd74c5471e..594171be46 100644
--- a/core/fpdfapi/parser/cpdf_parser.h
+++ b/core/fpdfapi/parser/cpdf_parser.h
@@ -152,9 +152,7 @@ class CPDF_Parser {
ObjectInfo info;
};
- Error StartParseInternal(const CFX_RetainPtr<IFX_SeekableReadStream>& pFile,
- CPDF_Document* pDocument,
- int32_t iHeaderOffset);
+ Error StartParseInternal(CPDF_Document* pDocument);
CPDF_Object* ParseDirect(CPDF_Object* pObj);
bool LoadAllCrossRefV4(FX_FILESIZE pos);
bool LoadAllCrossRefV5(FX_FILESIZE pos);
@@ -167,9 +165,7 @@ class CPDF_Parser {
bool LoadLinearizedAllCrossRefV5(FX_FILESIZE pos);
Error LoadLinearizedMainXRefTable();
CFX_RetainPtr<CPDF_StreamAcc> GetObjectStream(uint32_t number);
- bool IsLinearizedFile(
- const CFX_RetainPtr<IFX_SeekableReadStream>& pFileAccess,
- uint32_t offset);
+ bool ParseLinearizedHeader();
void SetEncryptDictionary(CPDF_Dictionary* pDict);
void ShrinkObjectMap(uint32_t size);
// A simple check whether the cross reference table matches with
@@ -193,6 +189,10 @@ class CPDF_Parser {
bool strict_parse,
FX_FILESIZE* pResultPos);
+ bool InitSyntaxParser(
+ const CFX_RetainPtr<IFX_SeekableReadStream>& file_access);
+ bool ParseFileVersion();
+
CFX_UnownedPtr<CPDF_Document> m_pDocument;
bool m_bHasParsed;
bool m_bXRefStream;