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PL286/external/pdfium/fpdfsdk/javascript/JS_GlobalData.cpp

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