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-rw-r--r--testing/libfuzzer/pdf_css_fuzzer.cc6
-rw-r--r--xfa/fde/css/fde_csssyntax.cpp167
-rw-r--r--xfa/fde/css/fde_csssyntax.h13
3 files changed, 65 insertions, 121 deletions
diff --git a/testing/libfuzzer/pdf_css_fuzzer.cc b/testing/libfuzzer/pdf_css_fuzzer.cc
index 4a45a03f5f..779f5ca37f 100644
--- a/testing/libfuzzer/pdf_css_fuzzer.cc
+++ b/testing/libfuzzer/pdf_css_fuzzer.cc
@@ -15,12 +15,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
CFX_WideString input = CFX_WideString::FromUTF8(
CFX_ByteStringC(data, static_cast<FX_STRSIZE>(size)));
- auto stream = pdfium::MakeRetain<CXFA_WideTextRead>(input);
- if (!stream)
- return 0;
-
CFDE_CSSSyntaxParser parser;
- parser.Init(stream, 1024);
+ parser.Init(input.c_str(), size);
FDE_CSSSyntaxStatus status;
do {
diff --git a/xfa/fde/css/fde_csssyntax.cpp b/xfa/fde/css/fde_csssyntax.cpp
index f25eb4b115..0ea46e8476 100644
--- a/xfa/fde/css/fde_csssyntax.cpp
+++ b/xfa/fde/css/fde_csssyntax.cpp
@@ -21,10 +21,7 @@ bool FDE_IsSelectorStart(FX_WCHAR wch) {
} // namespace
CFDE_CSSSyntaxParser::CFDE_CSSSyntaxParser()
- : m_pStream(nullptr),
- m_iStreamPos(0),
- m_iPlaneSize(0),
- m_iTextDatLen(0),
+ : m_iTextDatLen(0),
m_dwCheck((uint32_t)-1),
m_eMode(FDE_CSSSYNTAXMODE_RuleSet),
m_eStatus(FDE_CSSSyntaxStatus::None),
@@ -35,70 +32,38 @@ CFDE_CSSSyntaxParser::~CFDE_CSSSyntaxParser() {
m_TextPlane.Reset();
}
-bool CFDE_CSSSyntaxParser::Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
- int32_t iCSSPlaneSize,
- int32_t iTextDataSize,
- bool bOnlyDeclaration) {
- ASSERT(pStream && iCSSPlaneSize > 0 && iTextDataSize > 0);
- Reset(bOnlyDeclaration);
- if (!m_TextData.EstimateSize(iTextDataSize)) {
- return false;
- }
- uint8_t bom[4];
- m_pStream = pStream;
- m_iStreamPos = m_pStream->GetBOM(bom);
- m_iPlaneSize = iCSSPlaneSize;
- return true;
-}
bool CFDE_CSSSyntaxParser::Init(const FX_WCHAR* pBuffer,
int32_t iBufferSize,
int32_t iTextDatSize,
bool bOnlyDeclaration) {
ASSERT(pBuffer && iBufferSize > 0 && iTextDatSize > 0);
Reset(bOnlyDeclaration);
- if (!m_TextData.EstimateSize(iTextDatSize)) {
+ if (!m_TextData.EstimateSize(iTextDatSize))
return false;
- }
return m_TextPlane.AttachBuffer(pBuffer, iBufferSize);
}
+
void CFDE_CSSSyntaxParser::Reset(bool bOnlyDeclaration) {
m_TextPlane.Reset();
m_TextData.Reset();
- m_pStream = nullptr;
- m_iStreamPos = 0;
m_iTextDatLen = 0;
m_dwCheck = (uint32_t)-1;
m_eStatus = FDE_CSSSyntaxStatus::None;
m_eMode = bOnlyDeclaration ? FDE_CSSSYNTAXMODE_PropertyName
: FDE_CSSSYNTAXMODE_RuleSet;
}
+
FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
while (m_eStatus >= FDE_CSSSyntaxStatus::None) {
if (m_TextPlane.IsEOF()) {
- if (!m_pStream) {
- if (m_eMode == FDE_CSSSYNTAXMODE_PropertyValue &&
- m_TextData.GetLength() > 0) {
- SaveTextData();
- m_eStatus = FDE_CSSSyntaxStatus::PropertyValue;
- return m_eStatus;
- }
- m_eStatus = FDE_CSSSyntaxStatus::EOS;
- return m_eStatus;
- }
- bool bEOS;
- int32_t iLen = m_TextPlane.LoadFromStream(m_pStream, m_iStreamPos,
- m_iPlaneSize, bEOS);
- m_iStreamPos = m_pStream->GetPosition();
- if (iLen < 1) {
- if (m_eMode == FDE_CSSSYNTAXMODE_PropertyValue &&
- m_TextData.GetLength() > 0) {
- SaveTextData();
- m_eStatus = FDE_CSSSyntaxStatus::PropertyValue;
- return m_eStatus;
- }
- m_eStatus = FDE_CSSSyntaxStatus::EOS;
+ if (m_eMode == FDE_CSSSYNTAXMODE_PropertyValue &&
+ m_TextData.GetLength() > 0) {
+ SaveTextData();
+ m_eStatus = FDE_CSSSyntaxStatus::PropertyValue;
return m_eStatus;
}
+ m_eStatus = FDE_CSSSyntaxStatus::EOS;
+ return m_eStatus;
}
FX_WCHAR wch;
while (!m_TextPlane.IsEOF()) {
@@ -112,13 +77,11 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
break;
case '}':
m_TextPlane.MoveNext();
- if (RestoreMode()) {
+ if (RestoreMode())
return FDE_CSSSyntaxStatus::DeclClose;
- } else {
- m_eStatus = FDE_CSSSyntaxStatus::Error;
- return m_eStatus;
- }
- break;
+
+ m_eStatus = FDE_CSSSyntaxStatus::Error;
+ return m_eStatus;
case '/':
if (m_TextPlane.GetNextChar() == '*') {
m_ModeStack.Push(m_eMode);
@@ -143,26 +106,22 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
case ',':
m_TextPlane.MoveNext();
SwitchMode(FDE_CSSSYNTAXMODE_Selector);
- if (m_iTextDatLen > 0) {
+ if (m_iTextDatLen > 0)
return FDE_CSSSyntaxStatus::Selector;
- }
break;
case '{':
if (m_TextData.GetLength() > 0) {
SaveTextData();
return FDE_CSSSyntaxStatus::Selector;
- } else {
- m_TextPlane.MoveNext();
- m_ModeStack.Push(FDE_CSSSYNTAXMODE_RuleSet);
- SwitchMode(FDE_CSSSYNTAXMODE_PropertyName);
- return FDE_CSSSyntaxStatus::DeclOpen;
}
- break;
+ m_TextPlane.MoveNext();
+ m_ModeStack.Push(FDE_CSSSYNTAXMODE_RuleSet);
+ SwitchMode(FDE_CSSSYNTAXMODE_PropertyName);
+ return FDE_CSSSyntaxStatus::DeclOpen;
case '/':
if (m_TextPlane.GetNextChar() == '*') {
- if (SwitchToComment() > 0) {
+ if (SwitchToComment() > 0)
return FDE_CSSSyntaxStatus::Selector;
- }
break;
}
default:
@@ -178,18 +137,15 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
return FDE_CSSSyntaxStatus::PropertyName;
case '}':
m_TextPlane.MoveNext();
- if (RestoreMode()) {
+ if (RestoreMode())
return FDE_CSSSyntaxStatus::DeclClose;
- } else {
- m_eStatus = FDE_CSSSyntaxStatus::Error;
- return m_eStatus;
- }
- break;
+
+ m_eStatus = FDE_CSSSyntaxStatus::Error;
+ return m_eStatus;
case '/':
if (m_TextPlane.GetNextChar() == '*') {
- if (SwitchToComment() > 0) {
+ if (SwitchToComment() > 0)
return FDE_CSSSyntaxStatus::PropertyName;
- }
break;
}
default:
@@ -206,9 +162,8 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
return FDE_CSSSyntaxStatus::PropertyValue;
case '/':
if (m_TextPlane.GetNextChar() == '*') {
- if (SwitchToComment() > 0) {
+ if (SwitchToComment() > 0)
return FDE_CSSSyntaxStatus::PropertyValue;
- }
break;
}
default:
@@ -230,9 +185,8 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
case ',':
m_TextPlane.MoveNext();
SwitchMode(FDE_CSSSYNTAXMODE_MediaType);
- if (m_iTextDatLen > 0) {
+ if (m_iTextDatLen > 0)
return FDE_CSSSyntaxStatus::MediaType;
- }
break;
case '{': {
FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement();
@@ -244,13 +198,12 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
if (m_TextData.GetLength() > 0) {
SaveTextData();
return FDE_CSSSyntaxStatus::MediaType;
- } else {
- m_TextPlane.MoveNext();
- *pMode = FDE_CSSSYNTAXMODE_RuleSet;
- SwitchMode(FDE_CSSSYNTAXMODE_RuleSet);
- return FDE_CSSSyntaxStatus::DeclOpen;
}
- } break;
+ m_TextPlane.MoveNext();
+ *pMode = FDE_CSSSYNTAXMODE_RuleSet;
+ SwitchMode(FDE_CSSSYNTAXMODE_RuleSet);
+ return FDE_CSSSyntaxStatus::DeclOpen;
+ }
case ';': {
FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement();
if (!pMode || *pMode != FDE_CSSSYNTAXMODE_Import) {
@@ -260,9 +213,8 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
if (m_TextData.GetLength() > 0) {
SaveTextData();
- if (IsImportEnabled()) {
+ if (IsImportEnabled())
return FDE_CSSSyntaxStatus::MediaType;
- }
} else {
bool bEnabled = IsImportEnabled();
m_TextPlane.MoveNext();
@@ -276,9 +228,8 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
} break;
case '/':
if (m_TextPlane.GetNextChar() == '*') {
- if (SwitchToComment() > 0) {
+ if (SwitchToComment() > 0)
return FDE_CSSSyntaxStatus::MediaType;
- }
break;
}
default:
@@ -317,11 +268,9 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
} else if (FXSYS_wcsncmp(L"import", psz, iLen) == 0) {
m_ModeStack.Push(FDE_CSSSYNTAXMODE_Import);
SwitchMode(FDE_CSSSYNTAXMODE_URI);
- if (IsImportEnabled()) {
+ if (IsImportEnabled())
return FDE_CSSSyntaxStatus::ImportRule;
- } else {
- break;
- }
+ break;
} else if (FXSYS_wcsncmp(L"media", psz, iLen) == 0) {
m_ModeStack.Push(FDE_CSSSYNTAXMODE_MediaRule);
SwitchMode(FDE_CSSSYNTAXMODE_MediaType);
@@ -343,26 +292,16 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
SwitchMode(FDE_CSSSYNTAXMODE_RuleSet);
if (IsCharsetEnabled()) {
DisableCharset();
- if (m_iTextDatLen > 0) {
- if (m_pStream) {
- uint16_t wCodePage = FX_GetCodePageFromStringW(
- m_TextData.GetBuffer(), m_iTextDatLen);
- if (wCodePage < 0xFFFF &&
- m_pStream->GetCodePage() != wCodePage) {
- m_pStream->SetCodePage(wCodePage);
- }
- }
+ if (m_iTextDatLen > 0)
return FDE_CSSSyntaxStatus::Charset;
- }
}
} else {
AppendChar(wch);
}
break;
case FDE_CSSSYNTAXMODE_UnknownRule:
- if (wch == ';') {
+ if (wch == ';')
SwitchMode(FDE_CSSSYNTAXMODE_RuleSet);
- }
m_TextPlane.MoveNext();
break;
default:
@@ -373,15 +312,15 @@ FDE_CSSSyntaxStatus CFDE_CSSSyntaxParser::DoSyntaxParse() {
}
return m_eStatus;
}
+
bool CFDE_CSSSyntaxParser::IsImportEnabled() const {
- if ((m_dwCheck & FDE_CSSSYNTAXCHECK_AllowImport) == 0) {
+ if ((m_dwCheck & FDE_CSSSYNTAXCHECK_AllowImport) == 0)
return false;
- }
- if (m_ModeStack.GetSize() > 1) {
+ if (m_ModeStack.GetSize() > 1)
return false;
- }
return true;
}
+
bool CFDE_CSSSyntaxParser::AppendChar(FX_WCHAR wch) {
m_TextPlane.MoveNext();
if (m_TextData.GetLength() > 0 || wch > ' ') {
@@ -390,21 +329,25 @@ bool CFDE_CSSSyntaxParser::AppendChar(FX_WCHAR wch) {
}
return false;
}
+
int32_t CFDE_CSSSyntaxParser::SaveTextData() {
m_iTextDatLen = m_TextData.TrimEnd();
m_TextData.Clear();
return m_iTextDatLen;
}
+
void CFDE_CSSSyntaxParser::SwitchMode(FDE_CSSSYNTAXMODE eMode) {
m_eMode = eMode;
SaveTextData();
}
+
int32_t CFDE_CSSSyntaxParser::SwitchToComment() {
int32_t iLength = m_TextData.GetLength();
m_ModeStack.Push(m_eMode);
SwitchMode(FDE_CSSSYNTAXMODE_Comment);
return iLength;
}
+
bool CFDE_CSSSyntaxParser::RestoreMode() {
FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement();
if (!pMode)
@@ -414,19 +357,23 @@ bool CFDE_CSSSyntaxParser::RestoreMode() {
m_ModeStack.Pop();
return true;
}
+
const FX_WCHAR* CFDE_CSSSyntaxParser::GetCurrentString(int32_t& iLength) const {
iLength = m_iTextDatLen;
return m_TextData.GetBuffer();
}
+
CFDE_CSSTextBuf::CFDE_CSSTextBuf()
: m_bExtBuf(false),
m_pBuffer(nullptr),
m_iBufLen(0),
m_iDatLen(0),
m_iDatPos(0) {}
+
CFDE_CSSTextBuf::~CFDE_CSSTextBuf() {
Reset();
}
+
void CFDE_CSSTextBuf::Reset() {
if (!m_bExtBuf) {
FX_Free(m_pBuffer);
@@ -434,12 +381,14 @@ void CFDE_CSSTextBuf::Reset() {
}
m_iDatPos = m_iDatLen = m_iBufLen;
}
+
bool CFDE_CSSTextBuf::AttachBuffer(const FX_WCHAR* pBuffer, int32_t iBufLen) {
Reset();
m_pBuffer = const_cast<FX_WCHAR*>(pBuffer);
m_iDatLen = m_iBufLen = iBufLen;
return m_bExtBuf = true;
}
+
bool CFDE_CSSTextBuf::EstimateSize(int32_t iAllocSize) {
ASSERT(iAllocSize > 0);
Clear();
@@ -466,16 +415,15 @@ int32_t CFDE_CSSTextBuf::LoadFromStream(
}
bool CFDE_CSSTextBuf::ExpandBuf(int32_t iDesiredSize) {
- if (m_bExtBuf) {
+ if (m_bExtBuf)
return false;
- }
- if (!m_pBuffer) {
+ if (!m_pBuffer)
m_pBuffer = FX_Alloc(FX_WCHAR, iDesiredSize);
- } else if (m_iBufLen != iDesiredSize) {
+ else if (m_iBufLen != iDesiredSize)
m_pBuffer = FX_Realloc(FX_WCHAR, m_pBuffer, iDesiredSize);
- } else {
+ else
return true;
- }
+
if (!m_pBuffer) {
m_iBufLen = 0;
return false;
@@ -486,6 +434,7 @@ bool CFDE_CSSTextBuf::ExpandBuf(int32_t iDesiredSize) {
void CFDE_CSSTextBuf::Subtract(int32_t iStart, int32_t iLength) {
ASSERT(iStart >= 0 && iLength >= 0);
+
iLength = std::max(std::min(iLength, m_iDatLen - iStart), 0);
FXSYS_memmove(m_pBuffer, m_pBuffer + iStart, iLength * sizeof(FX_WCHAR));
m_iDatLen = iLength;
diff --git a/xfa/fde/css/fde_csssyntax.h b/xfa/fde/css/fde_csssyntax.h
index c7578e170b..b29cf23886 100644
--- a/xfa/fde/css/fde_csssyntax.h
+++ b/xfa/fde/css/fde_csssyntax.h
@@ -28,8 +28,10 @@ class CFDE_CSSTextBuf {
m_pBuffer[m_iDatLen++] = wch;
return true;
}
+
void Clear() { m_iDatPos = m_iDatLen = 0; }
void Reset();
+
int32_t TrimEnd() {
while (m_iDatLen > 0 && m_pBuffer[m_iDatLen - 1] <= ' ') {
--m_iDatLen;
@@ -37,14 +39,18 @@ class CFDE_CSSTextBuf {
AppendChar(0);
return --m_iDatLen;
}
+
void Subtract(int32_t iStart, int32_t iLength);
bool IsEOF() const { return m_iDatPos >= m_iDatLen; }
+
FX_WCHAR GetAt(int32_t index) const { return m_pBuffer[index]; }
FX_WCHAR GetChar() const { return m_pBuffer[m_iDatPos]; }
FX_WCHAR GetNextChar() const {
return (m_iDatPos + 1 >= m_iDatLen) ? 0 : m_pBuffer[m_iDatPos + 1];
}
+
void MoveNext() { m_iDatPos++; }
+
int32_t GetLength() const { return m_iDatLen; }
const FX_WCHAR* GetBuffer() const { return m_pBuffer; }
@@ -80,10 +86,6 @@ class CFDE_CSSSyntaxParser {
CFDE_CSSSyntaxParser();
~CFDE_CSSSyntaxParser();
- bool Init(const CFX_RetainPtr<IFGAS_Stream>& pStream,
- int32_t iCSSPlaneSize,
- int32_t iTextDataSize = 32,
- bool bOnlyDeclaration = false);
bool Init(const FX_WCHAR* pBuffer,
int32_t iBufferSize,
int32_t iTextDatSize = 32,
@@ -106,9 +108,6 @@ class CFDE_CSSSyntaxParser {
bool IsImportEnabled() const;
void DisableImport() { m_dwCheck = 0; }
- CFX_RetainPtr<IFGAS_Stream> m_pStream;
- int32_t m_iStreamPos;
- int32_t m_iPlaneSize;
CFDE_CSSTextBuf m_TextData;
CFDE_CSSTextBuf m_TextPlane;
int32_t m_iTextDatLen;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 16:17:00 +0000