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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. http://www.foxitsoftware.com
#include "core/fpdfapi/page/pageint.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"
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.reset(new CPDF_StreamAcc);
m_pSingleStream->LoadAllData(pStream, 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_bbox.Transform(&form_matrix);
if (pParentMatrix)
form_bbox.Transform(pParentMatrix);
}
CPDF_Dictionary* pResources = pForm->m_pFormDict->GetDictFor("Resources");
m_pParser.reset(new 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.reset(new CPDF_StreamAcc);
m_pSingleStream->LoadAllData(pForm->m_pFormStream, 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) {
FXSYS_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");
m_StreamArray[m_CurrentOffset].reset(new CPDF_StreamAcc);
CPDF_Stream* pStreamObj = ToStream(
pContent ? pContent->GetDirectObjectAt(m_CurrentOffset) : nullptr);
m_StreamArray[m_CurrentOffset]->LoadAllData(pStreamObj, false);
m_CurrentOffset++;
}
}
if (m_InternalStage == STAGE_PARSE) {
if (!m_pParser) {
m_pParser.reset(new 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_FloatRect old_rect(ClipPath.GetPointX(0), ClipPath.GetPointY(0),
ClipPath.GetPointX(2), ClipPath.GetPointY(2));
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;
}
}
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