diff options
Diffstat (limited to 'xfa/fde/css/fde_csssyntax.cpp')
| -rw-r--r-- | xfa/fde/css/fde_csssyntax.cpp | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/xfa/fde/css/fde_csssyntax.cpp b/xfa/fde/css/fde_csssyntax.cpp new file mode 100644 index 0000000000..e03c57c6a8 --- /dev/null +++ b/xfa/fde/css/fde_csssyntax.cpp @@ -0,0 +1,487 @@ +// 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 "xfa/fde/css/fde_csssyntax.h" + +#include "xfa/fde/css/fde_cssdatatable.h" +#include "xfa/fgas/crt/fgas_codepage.h" + +#ifdef _cplusplus +extern "C" { +#endif + +inline FX_BOOL FDE_IsSelectorStart(FX_WCHAR wch) { + return wch == '.' || wch == '#' || wch == '*' || (wch >= 'a' && wch <= 'z') || + (wch >= 'A' && wch <= 'Z'); +} + +#ifdef _cplusplus +}; +#endif + +IFDE_CSSSyntaxParser* IFDE_CSSSyntaxParser::Create() { + return new CFDE_CSSSyntaxParser; +} +CFDE_CSSSyntaxParser::CFDE_CSSSyntaxParser() + : m_pStream(NULL), + m_iStreamPos(0), + m_iPlaneSize(0), + m_iTextDatLen(0), + m_dwCheck((FX_DWORD)-1), + m_eMode(FDE_CSSSYNTAXMODE_RuleSet), + m_eStatus(FDE_CSSSYNTAXSTATUS_None) {} +CFDE_CSSSyntaxParser::~CFDE_CSSSyntaxParser() { + m_TextData.Reset(); + m_TextPlane.Reset(); +} +FX_BOOL CFDE_CSSSyntaxParser::Init(IFX_Stream* pStream, + int32_t iCSSPlaneSize, + int32_t iTextDataSize, + FX_BOOL bOnlyDeclaration) { + FXSYS_assert(pStream != NULL && 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; +} +FX_BOOL CFDE_CSSSyntaxParser::Init(const FX_WCHAR* pBuffer, + int32_t iBufferSize, + int32_t iTextDatSize, + FX_BOOL bOnlyDeclaration) { + FXSYS_assert(pBuffer != NULL && iBufferSize > 0 && iTextDatSize > 0); + Reset(bOnlyDeclaration); + if (!m_TextData.EstimateSize(iTextDatSize)) { + return FALSE; + } + return m_TextPlane.AttachBuffer(pBuffer, iBufferSize); +} +void CFDE_CSSSyntaxParser::Reset(FX_BOOL bOnlyDeclaration) { + m_TextPlane.Reset(); + m_TextData.Reset(); + m_pStream = NULL; + m_iStreamPos = 0; + m_iTextDatLen = 0; + m_dwCheck = (FX_DWORD)-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 == NULL) { + if (m_eMode == FDE_CSSSYNTAXMODE_PropertyValue && + m_TextData.GetLength() > 0) { + SaveTextData(); + return m_eStatus = FDE_CSSSYNTAXSTATUS_PropertyValue; + } + return m_eStatus = FDE_CSSSYNTAXSTATUS_EOS; + } + FX_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(); + return m_eStatus = FDE_CSSSYNTAXSTATUS_PropertyValue; + } + return m_eStatus = FDE_CSSSYNTAXSTATUS_EOS; + } + } + FX_WCHAR wch; + while (!m_TextPlane.IsEOF()) { + wch = m_TextPlane.GetChar(); + switch (m_eMode) { + case FDE_CSSSYNTAXMODE_RuleSet: + switch (wch) { + case '@': + m_TextPlane.MoveNext(); + SwitchMode(FDE_CSSSYNTAXMODE_AtRule); + break; + case '}': + m_TextPlane.MoveNext(); + if (RestoreMode()) { + return FDE_CSSSYNTAXSTATUS_DeclClose; + } else { + return m_eStatus = FDE_CSSSYNTAXSTATUS_Error; + } + break; + case '/': + if (m_TextPlane.GetNextChar() == '*') { + m_ModeStack.Push(m_eMode); + SwitchMode(FDE_CSSSYNTAXMODE_Comment); + break; + } + default: + if (wch <= ' ') { + m_TextPlane.MoveNext(); + } else if (FDE_IsSelectorStart(wch)) { + SwitchMode(FDE_CSSSYNTAXMODE_Selector); + return FDE_CSSSYNTAXSTATUS_StyleRule; + } else { + return m_eStatus = FDE_CSSSYNTAXSTATUS_Error; + } + break; + } + break; + case FDE_CSSSYNTAXMODE_Selector: + switch (wch) { + case ',': + m_TextPlane.MoveNext(); + SwitchMode(FDE_CSSSYNTAXMODE_Selector); + 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; + case '/': + if (m_TextPlane.GetNextChar() == '*') { + if (SwitchToComment() > 0) { + return FDE_CSSSYNTAXSTATUS_Selector; + } + break; + } + default: + AppendChar(wch); + break; + } + break; + case FDE_CSSSYNTAXMODE_PropertyName: + switch (wch) { + case ':': + m_TextPlane.MoveNext(); + SwitchMode(FDE_CSSSYNTAXMODE_PropertyValue); + return FDE_CSSSYNTAXSTATUS_PropertyName; + case '}': + m_TextPlane.MoveNext(); + if (RestoreMode()) { + return FDE_CSSSYNTAXSTATUS_DeclClose; + } else { + return m_eStatus = FDE_CSSSYNTAXSTATUS_Error; + } + break; + case '/': + if (m_TextPlane.GetNextChar() == '*') { + if (SwitchToComment() > 0) { + return FDE_CSSSYNTAXSTATUS_PropertyName; + } + break; + } + default: + AppendChar(wch); + break; + } + break; + case FDE_CSSSYNTAXMODE_PropertyValue: + switch (wch) { + case ';': + m_TextPlane.MoveNext(); + case '}': + SwitchMode(FDE_CSSSYNTAXMODE_PropertyName); + return FDE_CSSSYNTAXSTATUS_PropertyValue; + case '/': + if (m_TextPlane.GetNextChar() == '*') { + if (SwitchToComment() > 0) { + return FDE_CSSSYNTAXSTATUS_PropertyValue; + } + break; + } + default: + AppendChar(wch); + break; + } + break; + case FDE_CSSSYNTAXMODE_Comment: + if (wch == '/' && m_TextData.GetLength() > 0 && + m_TextData.GetAt(m_TextData.GetLength() - 1) == '*') { + RestoreMode(); + } else { + m_TextData.AppendChar(wch); + } + m_TextPlane.MoveNext(); + break; + case FDE_CSSSYNTAXMODE_MediaType: + switch (wch) { + case ',': + m_TextPlane.MoveNext(); + SwitchMode(FDE_CSSSYNTAXMODE_MediaType); + if (m_iTextDatLen > 0) { + return FDE_CSSSYNTAXSTATUS_MediaType; + } + break; + case '{': { + FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement(); + if (pMode == NULL || *pMode != FDE_CSSSYNTAXMODE_MediaRule) { + return m_eStatus = FDE_CSSSYNTAXSTATUS_Error; + } + 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; + case ';': { + FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement(); + if (pMode == NULL || *pMode != FDE_CSSSYNTAXMODE_Import) { + return m_eStatus = FDE_CSSSYNTAXSTATUS_Error; + } + if (m_TextData.GetLength() > 0) { + SaveTextData(); + if (IsImportEnabled()) { + return FDE_CSSSYNTAXSTATUS_MediaType; + } + } else { + FX_BOOL bEnabled = IsImportEnabled(); + m_TextPlane.MoveNext(); + m_ModeStack.Pop(); + SwitchMode(FDE_CSSSYNTAXMODE_RuleSet); + if (bEnabled) { + DisableImport(); + return FDE_CSSSYNTAXSTATUS_ImportClose; + } + } + } break; + case '/': + if (m_TextPlane.GetNextChar() == '*') { + if (SwitchToComment() > 0) { + return FDE_CSSSYNTAXSTATUS_MediaType; + } + break; + } + default: + AppendChar(wch); + break; + } + break; + case FDE_CSSSYNTAXMODE_URI: { + FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement(); + if (pMode == NULL || *pMode != FDE_CSSSYNTAXMODE_Import) { + return m_eStatus = FDE_CSSSYNTAXSTATUS_Error; + } + if (wch <= ' ' || wch == ';') { + int32_t iURIStart, iURILength = m_TextData.GetLength(); + if (iURILength > 0 && + FDE_ParseCSSURI(m_TextData.GetBuffer(), iURILength, iURIStart, + iURILength)) { + m_TextData.Subtract(iURIStart, iURILength); + SwitchMode(FDE_CSSSYNTAXMODE_MediaType); + if (IsImportEnabled()) { + return FDE_CSSSYNTAXSTATUS_URI; + } else { + break; + } + } + } + AppendChar(wch); + } break; + case FDE_CSSSYNTAXMODE_AtRule: + if (wch > ' ') { + AppendChar(wch); + } else { + int32_t iLen = m_TextData.GetLength(); + const FX_WCHAR* psz = m_TextData.GetBuffer(); + if (FXSYS_wcsncmp(L"charset", psz, iLen) == 0) { + SwitchMode(FDE_CSSSYNTAXMODE_Charset); + } else if (FXSYS_wcsncmp(L"import", psz, iLen) == 0) { + m_ModeStack.Push(FDE_CSSSYNTAXMODE_Import); + SwitchMode(FDE_CSSSYNTAXMODE_URI); + if (IsImportEnabled()) { + return FDE_CSSSYNTAXSTATUS_ImportRule; + } else { + break; + } + } else if (FXSYS_wcsncmp(L"media", psz, iLen) == 0) { + m_ModeStack.Push(FDE_CSSSYNTAXMODE_MediaRule); + SwitchMode(FDE_CSSSYNTAXMODE_MediaType); + return FDE_CSSSYNTAXSTATUS_MediaRule; + } else if (FXSYS_wcsncmp(L"font-face", psz, iLen) == 0) { + SwitchMode(FDE_CSSSYNTAXMODE_Selector); + return FDE_CSSSYNTAXSTATUS_FontFaceRule; + } else if (FXSYS_wcsncmp(L"page", psz, iLen) == 0) { + SwitchMode(FDE_CSSSYNTAXMODE_Selector); + return FDE_CSSSYNTAXSTATUS_PageRule; + } else { + SwitchMode(FDE_CSSSYNTAXMODE_UnknownRule); + } + } + break; + case FDE_CSSSYNTAXMODE_Charset: + if (wch == ';') { + m_TextPlane.MoveNext(); + SwitchMode(FDE_CSSSYNTAXMODE_RuleSet); + if (IsCharsetEnabled()) { + DisableCharset(); + if (m_iTextDatLen > 0) { + if (m_pStream != NULL) { + FX_WORD wCodePage = FX_GetCodePageFormStringW( + m_TextData.GetBuffer(), m_iTextDatLen); + if (wCodePage < 0xFFFF && + m_pStream->GetCodePage() != wCodePage) { + m_pStream->SetCodePage(wCodePage); + } + } + return FDE_CSSSYNTAXSTATUS_Charset; + } + } + } else { + AppendChar(wch); + } + break; + case FDE_CSSSYNTAXMODE_UnknownRule: + if (wch == ';') { + SwitchMode(FDE_CSSSYNTAXMODE_RuleSet); + } + m_TextPlane.MoveNext(); + break; + default: + FXSYS_assert(FALSE); + break; + } + } + } + return m_eStatus; +} +FX_BOOL CFDE_CSSSyntaxParser::IsImportEnabled() const { + if ((m_dwCheck & FDE_CSSSYNTAXCHECK_AllowImport) == 0) { + return FALSE; + } + if (m_ModeStack.GetSize() > 1) { + return FALSE; + } + return TRUE; +} +inline FX_BOOL CFDE_CSSSyntaxParser::AppendChar(FX_WCHAR wch) { + m_TextPlane.MoveNext(); + if (m_TextData.GetLength() > 0 || wch > ' ') { + m_TextData.AppendChar(wch); + return TRUE; + } + return FALSE; +} +inline int32_t CFDE_CSSSyntaxParser::SaveTextData() { + m_iTextDatLen = m_TextData.TrimEnd(); + m_TextData.Clear(); + return m_iTextDatLen; +} +inline void CFDE_CSSSyntaxParser::SwitchMode(FDE_CSSSYNTAXMODE eMode) { + m_eMode = eMode; + SaveTextData(); +} +inline int32_t CFDE_CSSSyntaxParser::SwitchToComment() { + int32_t iLength = m_TextData.GetLength(); + m_ModeStack.Push(m_eMode); + SwitchMode(FDE_CSSSYNTAXMODE_Comment); + return iLength; +} +inline FX_BOOL CFDE_CSSSyntaxParser::RestoreMode() { + FDE_CSSSYNTAXMODE* pMode = m_ModeStack.GetTopElement(); + if (pMode == NULL) { + return FALSE; + } + SwitchMode(*pMode); + 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(NULL), + 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); + m_pBuffer = NULL; + } + m_iDatPos = m_iDatLen = m_iBufLen; +} +FX_BOOL CFDE_CSSTextBuf::AttachBuffer(const FX_WCHAR* pBuffer, + int32_t iBufLen) { + Reset(); + m_pBuffer = (FX_WCHAR*)pBuffer; + m_iDatLen = m_iBufLen = iBufLen; + return m_bExtBuf = TRUE; +} +FX_BOOL CFDE_CSSTextBuf::EstimateSize(int32_t iAllocSize) { + FXSYS_assert(iAllocSize > 0); + Clear(); + m_bExtBuf = FALSE; + return ExpandBuf(iAllocSize); +} +int32_t CFDE_CSSTextBuf::LoadFromStream(IFX_Stream* pTxtStream, + int32_t iStreamOffset, + int32_t iMaxChars, + FX_BOOL& bEOS) { + FXSYS_assert(iStreamOffset >= 0 && iMaxChars > 0); + Clear(); + m_bExtBuf = FALSE; + if (!ExpandBuf(iMaxChars)) { + return 0; + } + if (pTxtStream->GetPosition() != iStreamOffset) { + pTxtStream->Seek(FX_STREAMSEEK_Begin, iStreamOffset); + } + m_iDatLen = pTxtStream->ReadString(m_pBuffer, iMaxChars, bEOS); + return m_iDatLen; +} +FX_BOOL CFDE_CSSTextBuf::ExpandBuf(int32_t iDesiredSize) { + if (m_bExtBuf) { + return FALSE; + } + if (!m_pBuffer) { + m_pBuffer = FX_Alloc(FX_WCHAR, iDesiredSize); + } else if (m_iBufLen != iDesiredSize) { + m_pBuffer = FX_Realloc(FX_WCHAR, m_pBuffer, iDesiredSize); + } else { + return TRUE; + } + if (!m_pBuffer) { + m_iBufLen = 0; + return FALSE; + } + m_iBufLen = iDesiredSize; + return TRUE; +} +void CFDE_CSSTextBuf::Subtract(int32_t iStart, int32_t iLength) { + FXSYS_assert(iStart >= 0 && iLength > 0); + if (iLength > m_iDatLen - iStart) { + iLength = m_iDatLen - iStart; + } + if (iLength < 0) { + iLength = 0; + } else { + FXSYS_memmove(m_pBuffer, m_pBuffer + iStart, iLength * sizeof(FX_WCHAR)); + } + m_iDatLen = iLength; +} |