| // 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 |
| |
| #include "core/fpdfapi/page/cpdf_contentparser.h" |
| |
| #include "core/fpdfapi/font/cpdf_type3char.h" |
| #include "core/fpdfapi/page/cpdf_allstates.h" |
| #include "core/fpdfapi/page/cpdf_form.h" |
| #include "core/fpdfapi/page/cpdf_page.h" |
| #include "core/fpdfapi/page/cpdf_pageobject.h" |
| #include "core/fpdfapi/page/cpdf_path.h" |
| #include "core/fpdfapi/parser/cpdf_array.h" |
| #include "core/fpdfapi/parser/cpdf_dictionary.h" |
| #include "core/fpdfapi/parser/cpdf_stream.h" |
| #include "core/fpdfapi/parser/cpdf_stream_acc.h" |
| #include "core/fxcrt/fx_safe_types.h" |
| #include "third_party/base/ptr_util.h" |
| |
| #define PARSE_STEP_LIMIT 100 |
| |
| CPDF_ContentParser::CPDF_ContentParser() |
| : m_Status(Ready), |
| m_InternalStage(STAGE_GETCONTENT), |
| m_pObjectHolder(nullptr), |
| m_bForm(false), |
| m_pType3Char(nullptr), |
| m_pData(nullptr), |
| m_Size(0), |
| m_CurrentOffset(0) {} |
| |
| CPDF_ContentParser::~CPDF_ContentParser() { |
| if (!m_pSingleStream) |
| FX_Free(m_pData); |
| } |
| |
| void CPDF_ContentParser::Start(CPDF_Page* pPage) { |
| if (m_Status != Ready || !pPage || !pPage->m_pDocument || |
| !pPage->m_pFormDict) { |
| m_Status = Done; |
| return; |
| } |
| m_pObjectHolder = pPage; |
| m_bForm = false; |
| m_Status = ToBeContinued; |
| m_InternalStage = STAGE_GETCONTENT; |
| m_CurrentOffset = 0; |
| |
| CPDF_Object* pContent = pPage->m_pFormDict->GetDirectObjectFor("Contents"); |
| if (!pContent) { |
| m_Status = Done; |
| return; |
| } |
| if (CPDF_Stream* pStream = pContent->AsStream()) { |
| m_nStreams = 0; |
| m_pSingleStream = pdfium::MakeRetain<CPDF_StreamAcc>(pStream); |
| m_pSingleStream->LoadAllData(false); |
| } else if (CPDF_Array* pArray = pContent->AsArray()) { |
| m_nStreams = pArray->GetCount(); |
| if (m_nStreams) |
| m_StreamArray.resize(m_nStreams); |
| else |
| m_Status = Done; |
| } else { |
| m_Status = Done; |
| } |
| } |
| |
| void CPDF_ContentParser::Start(CPDF_Form* pForm, |
| CPDF_AllStates* pGraphicStates, |
| const CFX_Matrix* pParentMatrix, |
| CPDF_Type3Char* pType3Char, |
| int level) { |
| m_pType3Char = pType3Char; |
| m_pObjectHolder = pForm; |
| m_bForm = true; |
| CFX_Matrix form_matrix = pForm->m_pFormDict->GetMatrixFor("Matrix"); |
| if (pGraphicStates) |
| form_matrix.Concat(pGraphicStates->m_CTM); |
| CPDF_Array* pBBox = pForm->m_pFormDict->GetArrayFor("BBox"); |
| CFX_FloatRect form_bbox; |
| CPDF_Path ClipPath; |
| if (pBBox) { |
| form_bbox = pBBox->GetRect(); |
| ClipPath.Emplace(); |
| ClipPath.AppendRect(form_bbox.left, form_bbox.bottom, form_bbox.right, |
| form_bbox.top); |
| ClipPath.Transform(&form_matrix); |
| if (pParentMatrix) |
| ClipPath.Transform(pParentMatrix); |
| |
| form_matrix.TransformRect(form_bbox); |
| if (pParentMatrix) |
| pParentMatrix->TransformRect(form_bbox); |
| } |
| |
| CPDF_Dictionary* pResources = pForm->m_pFormDict->GetDictFor("Resources"); |
| m_pParser = pdfium::MakeUnique<CPDF_StreamContentParser>( |
| pForm->m_pDocument, pForm->m_pPageResources, pForm->m_pResources, |
| pParentMatrix, pForm, pResources, &form_bbox, pGraphicStates, level); |
| m_pParser->GetCurStates()->m_CTM = form_matrix; |
| m_pParser->GetCurStates()->m_ParentMatrix = form_matrix; |
| if (ClipPath) { |
| m_pParser->GetCurStates()->m_ClipPath.AppendPath(ClipPath, FXFILL_WINDING, |
| true); |
| } |
| if (pForm->m_Transparency & PDFTRANS_GROUP) { |
| CPDF_GeneralState* pState = &m_pParser->GetCurStates()->m_GeneralState; |
| pState->SetBlendType(FXDIB_BLEND_NORMAL); |
| pState->SetStrokeAlpha(1.0f); |
| pState->SetFillAlpha(1.0f); |
| pState->SetSoftMask(nullptr); |
| } |
| m_nStreams = 0; |
| m_pSingleStream = pdfium::MakeRetain<CPDF_StreamAcc>(pForm->m_pFormStream); |
| m_pSingleStream->LoadAllData(false); |
| m_pData = (uint8_t*)m_pSingleStream->GetData(); |
| m_Size = m_pSingleStream->GetSize(); |
| m_Status = ToBeContinued; |
| m_InternalStage = STAGE_PARSE; |
| m_CurrentOffset = 0; |
| } |
| |
| void CPDF_ContentParser::Continue(IFX_Pause* pPause) { |
| int steps = 0; |
| while (m_Status == ToBeContinued) { |
| if (m_InternalStage == STAGE_GETCONTENT) { |
| if (m_CurrentOffset == m_nStreams) { |
| if (!m_StreamArray.empty()) { |
| FX_SAFE_UINT32 safeSize = 0; |
| for (const auto& stream : m_StreamArray) { |
| safeSize += stream->GetSize(); |
| safeSize += 1; |
| } |
| if (!safeSize.IsValid()) { |
| m_Status = Done; |
| return; |
| } |
| m_Size = safeSize.ValueOrDie(); |
| m_pData = FX_Alloc(uint8_t, m_Size); |
| uint32_t pos = 0; |
| for (const auto& stream : m_StreamArray) { |
| memcpy(m_pData + pos, stream->GetData(), stream->GetSize()); |
| pos += stream->GetSize(); |
| m_pData[pos++] = ' '; |
| } |
| m_StreamArray.clear(); |
| } else { |
| m_pData = (uint8_t*)m_pSingleStream->GetData(); |
| m_Size = m_pSingleStream->GetSize(); |
| } |
| m_InternalStage = STAGE_PARSE; |
| m_CurrentOffset = 0; |
| } else { |
| CPDF_Array* pContent = |
| m_pObjectHolder->m_pFormDict->GetArrayFor("Contents"); |
| CPDF_Stream* pStreamObj = ToStream( |
| pContent ? pContent->GetDirectObjectAt(m_CurrentOffset) : nullptr); |
| m_StreamArray[m_CurrentOffset] = |
| pdfium::MakeRetain<CPDF_StreamAcc>(pStreamObj); |
| m_StreamArray[m_CurrentOffset]->LoadAllData(false); |
| m_CurrentOffset++; |
| } |
| } |
| if (m_InternalStage == STAGE_PARSE) { |
| if (!m_pParser) { |
| m_pParser = pdfium::MakeUnique<CPDF_StreamContentParser>( |
| m_pObjectHolder->m_pDocument, m_pObjectHolder->m_pPageResources, |
| nullptr, nullptr, m_pObjectHolder, m_pObjectHolder->m_pResources, |
| &m_pObjectHolder->m_BBox, nullptr, 0); |
| m_pParser->GetCurStates()->m_ColorState.SetDefault(); |
| } |
| if (m_CurrentOffset >= m_Size) { |
| m_InternalStage = STAGE_CHECKCLIP; |
| } else { |
| m_CurrentOffset += |
| m_pParser->Parse(m_pData + m_CurrentOffset, |
| m_Size - m_CurrentOffset, PARSE_STEP_LIMIT); |
| } |
| } |
| if (m_InternalStage == STAGE_CHECKCLIP) { |
| if (m_pType3Char) { |
| m_pType3Char->m_bColored = m_pParser->IsColored(); |
| m_pType3Char->m_Width = |
| FXSYS_round(m_pParser->GetType3Data()[0] * 1000); |
| m_pType3Char->m_BBox.left = |
| FXSYS_round(m_pParser->GetType3Data()[2] * 1000); |
| m_pType3Char->m_BBox.bottom = |
| FXSYS_round(m_pParser->GetType3Data()[3] * 1000); |
| m_pType3Char->m_BBox.right = |
| FXSYS_round(m_pParser->GetType3Data()[4] * 1000); |
| m_pType3Char->m_BBox.top = |
| FXSYS_round(m_pParser->GetType3Data()[5] * 1000); |
| } |
| for (auto& pObj : *m_pObjectHolder->GetPageObjectList()) { |
| if (!pObj->m_ClipPath) |
| continue; |
| if (pObj->m_ClipPath.GetPathCount() != 1) |
| continue; |
| if (pObj->m_ClipPath.GetTextCount()) |
| continue; |
| CPDF_Path ClipPath = pObj->m_ClipPath.GetPath(0); |
| if (!ClipPath.IsRect() || pObj->IsShading()) |
| continue; |
| |
| CFX_PointF point0 = ClipPath.GetPoint(0); |
| CFX_PointF point2 = ClipPath.GetPoint(2); |
| CFX_FloatRect old_rect(point0.x, point0.y, point2.x, point2.y); |
| CFX_FloatRect obj_rect(pObj->m_Left, pObj->m_Bottom, pObj->m_Right, |
| pObj->m_Top); |
| if (old_rect.Contains(obj_rect)) |
| pObj->m_ClipPath.SetNull(); |
| } |
| m_Status = Done; |
| return; |
| } |
| steps++; |
| if (pPause && pPause->NeedToPauseNow()) |
| break; |
| } |
| } |
