// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "fxjs/cjs_globaldata.h"
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#include <utility>
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#include "core/fdrm/crypto/fx_crypt.h"
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#include "third_party/base/ptr_util.h"
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#include "third_party/base/stl_util.h"
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#define JS_MAXGLOBALDATA (1024 * 4 - 8)
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#define READER_JS_GLOBALDATA_FILENAME L"Reader_JsGlobal.Data"
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#define PHANTOM_JS_GLOBALDATA_FILENAME L"Phantom_JsGlobal.Data"
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#define SDK_JS_GLOBALDATA_FILENAME L"SDK_JsGlobal.Data"
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namespace {
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const uint8_t JS_RC4KEY[] = {
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0x19, 0xa8, 0xe8, 0x01, 0xf6, 0xa8, 0xb6, 0x4d, 0x82, 0x04, 0x45, 0x6d,
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0xb4, 0xcf, 0xd7, 0x77, 0x67, 0xf9, 0x75, 0x9f, 0xf0, 0xe0, 0x1e, 0x51,
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0xee, 0x46, 0xfd, 0x0b, 0xc9, 0x93, 0x25, 0x55, 0x4a, 0xee, 0xe0, 0x16,
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0xd0, 0xdf, 0x8c, 0xfa, 0x2a, 0xa9, 0x49, 0xfd, 0x97, 0x1c, 0x0e, 0x22,
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0x13, 0x28, 0x7c, 0xaf, 0xc4, 0xfc, 0x9c, 0x12, 0x65, 0x8c, 0x4e, 0x5b,
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0x04, 0x75, 0x89, 0xc9, 0xb1, 0xed, 0x50, 0xca, 0x96, 0x6f, 0x1a, 0x7a,
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0xfe, 0x58, 0x5d, 0xec, 0x19, 0x4a, 0xf6, 0x35, 0x6a, 0x97, 0x14, 0x00,
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0x0e, 0xd0, 0x6b, 0xbb, 0xd5, 0x75, 0x55, 0x8b, 0x6e, 0x6b, 0x19, 0xa0,
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0xf8, 0x77, 0xd5, 0xa3};
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// Returns true if non-empty, setting sPropName
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bool TrimPropName(ByteString* sPropName) {
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sPropName->Trim();
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return sPropName->GetLength() != 0;
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}
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CJS_GlobalData* g_pInstance = nullptr;
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} // namespace
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// static
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CJS_GlobalData* CJS_GlobalData::GetRetainedInstance(
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CPDFSDK_FormFillEnvironment* pApp) {
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if (!g_pInstance) {
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g_pInstance = new CJS_GlobalData();
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}
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++g_pInstance->m_RefCount;
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return g_pInstance;
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}
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void CJS_GlobalData::Release() {
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if (!--m_RefCount) {
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delete g_pInstance;
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g_pInstance = nullptr;
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}
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}
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CJS_GlobalData::CJS_GlobalData()
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: m_RefCount(0), m_sFilePath(SDK_JS_GLOBALDATA_FILENAME) {
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LoadGlobalPersistentVariables();
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}
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CJS_GlobalData::~CJS_GlobalData() {
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SaveGlobalPersisitentVariables();
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}
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CJS_GlobalData::iterator CJS_GlobalData::FindGlobalVariable(
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const ByteString& propname) {
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for (auto it = m_arrayGlobalData.begin(); it != m_arrayGlobalData.end();
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++it) {
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if ((*it)->data.sKey == propname)
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return it;
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}
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return m_arrayGlobalData.end();
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}
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CJS_GlobalData::const_iterator CJS_GlobalData::FindGlobalVariable(
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const ByteString& propname) const {
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for (auto it = m_arrayGlobalData.begin(); it != m_arrayGlobalData.end();
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++it) {
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if ((*it)->data.sKey == propname)
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return it;
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}
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return m_arrayGlobalData.end();
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}
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CJS_GlobalData_Element* CJS_GlobalData::GetGlobalVariable(
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const ByteString& propname) {
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auto iter = FindGlobalVariable(propname);
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return iter != m_arrayGlobalData.end() ? iter->get() : nullptr;
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}
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void CJS_GlobalData::SetGlobalVariableNumber(const ByteString& propname,
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double dData) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return;
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if (CJS_GlobalData_Element* pData = GetGlobalVariable(sPropName)) {
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pData->data.nType = JS_GlobalDataType::NUMBER;
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pData->data.dData = dData;
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return;
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}
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auto pNewData = pdfium::MakeUnique<CJS_GlobalData_Element>();
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pNewData->data.sKey = sPropName;
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pNewData->data.nType = JS_GlobalDataType::NUMBER;
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pNewData->data.dData = dData;
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m_arrayGlobalData.push_back(std::move(pNewData));
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}
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void CJS_GlobalData::SetGlobalVariableBoolean(const ByteString& propname,
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bool bData) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return;
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if (CJS_GlobalData_Element* pData = GetGlobalVariable(sPropName)) {
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pData->data.nType = JS_GlobalDataType::BOOLEAN;
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pData->data.bData = bData;
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return;
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}
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auto pNewData = pdfium::MakeUnique<CJS_GlobalData_Element>();
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pNewData->data.sKey = sPropName;
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pNewData->data.nType = JS_GlobalDataType::BOOLEAN;
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pNewData->data.bData = bData;
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m_arrayGlobalData.push_back(std::move(pNewData));
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}
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void CJS_GlobalData::SetGlobalVariableString(const ByteString& propname,
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const ByteString& sData) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return;
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if (CJS_GlobalData_Element* pData = GetGlobalVariable(sPropName)) {
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pData->data.nType = JS_GlobalDataType::STRING;
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pData->data.sData = sData;
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return;
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}
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auto pNewData = pdfium::MakeUnique<CJS_GlobalData_Element>();
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pNewData->data.sKey = sPropName;
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pNewData->data.nType = JS_GlobalDataType::STRING;
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pNewData->data.sData = sData;
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m_arrayGlobalData.push_back(std::move(pNewData));
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}
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void CJS_GlobalData::SetGlobalVariableObject(
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const ByteString& propname,
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const CJS_GlobalVariableArray& array) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return;
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if (CJS_GlobalData_Element* pData = GetGlobalVariable(sPropName)) {
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pData->data.nType = JS_GlobalDataType::OBJECT;
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pData->data.objData.Copy(array);
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return;
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}
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auto pNewData = pdfium::MakeUnique<CJS_GlobalData_Element>();
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pNewData->data.sKey = sPropName;
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pNewData->data.nType = JS_GlobalDataType::OBJECT;
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pNewData->data.objData.Copy(array);
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m_arrayGlobalData.push_back(std::move(pNewData));
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}
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void CJS_GlobalData::SetGlobalVariableNull(const ByteString& propname) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return;
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if (CJS_GlobalData_Element* pData = GetGlobalVariable(sPropName)) {
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pData->data.nType = JS_GlobalDataType::NULLOBJ;
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return;
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}
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auto pNewData = pdfium::MakeUnique<CJS_GlobalData_Element>();
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pNewData->data.sKey = sPropName;
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pNewData->data.nType = JS_GlobalDataType::NULLOBJ;
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m_arrayGlobalData.push_back(std::move(pNewData));
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}
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bool CJS_GlobalData::SetGlobalVariablePersistent(const ByteString& propname,
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bool bPersistent) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return false;
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CJS_GlobalData_Element* pData = GetGlobalVariable(sPropName);
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if (!pData)
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return false;
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pData->bPersistent = bPersistent;
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return true;
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}
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bool CJS_GlobalData::DeleteGlobalVariable(const ByteString& propname) {
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ByteString sPropName(propname);
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if (!TrimPropName(&sPropName))
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return false;
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auto iter = FindGlobalVariable(sPropName);
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if (iter == m_arrayGlobalData.end())
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return false;
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m_arrayGlobalData.erase(iter);
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return true;
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}
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int32_t CJS_GlobalData::GetSize() const {
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return pdfium::CollectionSize<int32_t>(m_arrayGlobalData);
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}
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CJS_GlobalData_Element* CJS_GlobalData::GetAt(int index) const {
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if (index < 0 || index >= GetSize())
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return nullptr;
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return m_arrayGlobalData[index].get();
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}
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void CJS_GlobalData::LoadGlobalPersistentVariables() {
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uint8_t* pBuffer = nullptr;
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int32_t nLength = 0;
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LoadFileBuffer(m_sFilePath.c_str(), pBuffer, nLength);
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CRYPT_ArcFourCryptBlock(pBuffer, nLength, JS_RC4KEY, sizeof(JS_RC4KEY));
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if (pBuffer) {
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uint8_t* p = pBuffer;
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uint16_t wType = *((uint16_t*)p);
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p += sizeof(uint16_t);
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if (wType == (uint16_t)(('X' << 8) | 'F')) {
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uint16_t wVersion = *((uint16_t*)p);
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p += sizeof(uint16_t);
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ASSERT(wVersion <= 2);
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uint32_t dwCount = *((uint32_t*)p);
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p += sizeof(uint32_t);
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uint32_t dwSize = *((uint32_t*)p);
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p += sizeof(uint32_t);
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if (dwSize == nLength - sizeof(uint16_t) * 2 - sizeof(uint32_t) * 2) {
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for (int32_t i = 0, sz = dwCount; i < sz; i++) {
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if (p > pBuffer + nLength)
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break;
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uint32_t dwNameLen = *((uint32_t*)p);
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p += sizeof(uint32_t);
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if (p + dwNameLen > pBuffer + nLength)
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break;
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ByteString sEntry = ByteString(p, dwNameLen);
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p += sizeof(char) * dwNameLen;
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JS_GlobalDataType wDataType =
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static_cast<JS_GlobalDataType>(*((uint16_t*)p));
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p += sizeof(uint16_t);
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switch (wDataType) {
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case JS_GlobalDataType::NUMBER: {
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double dData = 0;
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switch (wVersion) {
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case 1: {
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uint32_t dwData = *((uint32_t*)p);
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p += sizeof(uint32_t);
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dData = dwData;
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} break;
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case 2: {
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dData = *((double*)p);
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p += sizeof(double);
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} break;
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}
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SetGlobalVariableNumber(sEntry, dData);
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SetGlobalVariablePersistent(sEntry, true);
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} break;
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case JS_GlobalDataType::BOOLEAN: {
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uint16_t wData = *((uint16_t*)p);
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p += sizeof(uint16_t);
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SetGlobalVariableBoolean(sEntry, (bool)(wData == 1));
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SetGlobalVariablePersistent(sEntry, true);
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} break;
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case JS_GlobalDataType::STRING: {
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uint32_t dwLength = *((uint32_t*)p);
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p += sizeof(uint32_t);
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if (p + dwLength > pBuffer + nLength)
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break;
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SetGlobalVariableString(sEntry, ByteString(p, dwLength));
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SetGlobalVariablePersistent(sEntry, true);
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p += sizeof(char) * dwLength;
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} break;
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case JS_GlobalDataType::NULLOBJ: {
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SetGlobalVariableNull(sEntry);
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SetGlobalVariablePersistent(sEntry, true);
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}
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case JS_GlobalDataType::OBJECT:
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break;
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}
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}
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}
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}
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FX_Free(pBuffer);
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}
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}
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void CJS_GlobalData::SaveGlobalPersisitentVariables() {
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uint32_t nCount = 0;
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CFX_BinaryBuf sData;
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for (const auto& pElement : m_arrayGlobalData) {
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if (pElement->bPersistent) {
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CFX_BinaryBuf sElement;
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MakeByteString(pElement->data.sKey, &pElement->data, sElement);
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if (sData.GetSize() + sElement.GetSize() > JS_MAXGLOBALDATA)
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break;
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sData.AppendBlock(sElement.GetBuffer(), sElement.GetSize());
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nCount++;
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}
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}
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CFX_BinaryBuf sFile;
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uint16_t wType = (uint16_t)(('X' << 8) | 'F');
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sFile.AppendBlock(&wType, sizeof(uint16_t));
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uint16_t wVersion = 2;
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sFile.AppendBlock(&wVersion, sizeof(uint16_t));
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sFile.AppendBlock(&nCount, sizeof(uint32_t));
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uint32_t dwSize = sData.GetSize();
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sFile.AppendBlock(&dwSize, sizeof(uint32_t));
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sFile.AppendBlock(sData.GetBuffer(), sData.GetSize());
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CRYPT_ArcFourCryptBlock(sFile.GetBuffer(), sFile.GetSize(), JS_RC4KEY,
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sizeof(JS_RC4KEY));
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WriteFileBuffer(m_sFilePath.c_str(),
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reinterpret_cast<char*>(sFile.GetBuffer()), sFile.GetSize());
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}
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void CJS_GlobalData::LoadFileBuffer(const wchar_t* sFilePath,
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uint8_t*& pBuffer,
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int32_t& nLength) {
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// UnSupport.
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}
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void CJS_GlobalData::WriteFileBuffer(const wchar_t* sFilePath,
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const char* pBuffer,
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int32_t nLength) {
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// UnSupport.
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}
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void CJS_GlobalData::MakeByteString(const ByteString& name,
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CJS_KeyValue* pData,
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CFX_BinaryBuf& sData) {
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switch (pData->nType) {
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case JS_GlobalDataType::NUMBER: {
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uint32_t dwNameLen = (uint32_t)name.GetLength();
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sData.AppendBlock(&dwNameLen, sizeof(uint32_t));
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sData.AppendString(name);
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sData.AppendBlock(&pData->nType, sizeof(uint16_t));
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double dData = pData->dData;
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sData.AppendBlock(&dData, sizeof(double));
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} break;
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case JS_GlobalDataType::BOOLEAN: {
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uint32_t dwNameLen = (uint32_t)name.GetLength();
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sData.AppendBlock(&dwNameLen, sizeof(uint32_t));
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sData.AppendString(name);
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sData.AppendBlock(&pData->nType, sizeof(uint16_t));
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uint16_t wData = (uint16_t)pData->bData;
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sData.AppendBlock(&wData, sizeof(uint16_t));
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} break;
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case JS_GlobalDataType::STRING: {
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uint32_t dwNameLen = (uint32_t)name.GetLength();
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sData.AppendBlock(&dwNameLen, sizeof(uint32_t));
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sData.AppendString(name);
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sData.AppendBlock(&pData->nType, sizeof(uint16_t));
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uint32_t dwDataLen = (uint32_t)pData->sData.GetLength();
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sData.AppendBlock(&dwDataLen, sizeof(uint32_t));
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sData.AppendString(pData->sData);
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} break;
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case JS_GlobalDataType::NULLOBJ: {
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uint32_t dwNameLen = (uint32_t)name.GetLength();
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sData.AppendBlock(&dwNameLen, sizeof(uint32_t));
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sData.AppendString(name);
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sData.AppendBlock(&pData->nType, sizeof(uint32_t));
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} break;
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default:
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break;
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}
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}
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