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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 "xfa/include/fxfa/xfa_checksum.h"
#include "core/fdrm/crypto/include/fx_crypt.h"
#include "xfa/fgas/crt/fgas_algorithm.h"
CXFA_SAXReaderHandler::CXFA_SAXReaderHandler(CXFA_ChecksumContext* pContext)
: m_pContext(pContext) {
FXSYS_assert(m_pContext);
}
CXFA_SAXReaderHandler::~CXFA_SAXReaderHandler() {}
void* CXFA_SAXReaderHandler::OnTagEnter(const CFX_ByteStringC& bsTagName,
FX_SAXNODE eType,
uint32_t dwStartPos) {
UpdateChecksum(TRUE);
if (eType != FX_SAXNODE_Tag && eType != FX_SAXNODE_Instruction) {
return NULL;
}
m_SAXContext.m_eNode = eType;
CFX_ByteTextBuf& textBuf = m_SAXContext.m_TextBuf;
textBuf << "<";
if (eType == FX_SAXNODE_Instruction) {
textBuf << "?";
}
textBuf << bsTagName;
m_SAXContext.m_bsTagName = bsTagName;
return &m_SAXContext;
}
void CXFA_SAXReaderHandler::OnTagAttribute(void* pTag,
const CFX_ByteStringC& bsAttri,
const CFX_ByteStringC& bsValue) {
if (pTag == NULL) {
return;
}
CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
textBuf << " " << bsAttri << "=\"" << bsValue << "\"";
}
void CXFA_SAXReaderHandler::OnTagBreak(void* pTag) {
if (pTag == NULL) {
return;
}
CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
textBuf << ">";
UpdateChecksum(FALSE);
}
void CXFA_SAXReaderHandler::OnTagData(void* pTag,
FX_SAXNODE eType,
const CFX_ByteStringC& bsData,
uint32_t dwStartPos) {
if (pTag == NULL) {
return;
}
CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
if (eType == FX_SAXNODE_CharData) {
textBuf << "<![CDATA[";
}
textBuf << bsData;
if (eType == FX_SAXNODE_CharData) {
textBuf << "]]>";
}
}
void CXFA_SAXReaderHandler::OnTagClose(void* pTag, uint32_t dwEndPos) {
if (pTag == NULL) {
return;
}
CXFA_SAXContext* pSAXContext = (CXFA_SAXContext*)pTag;
CFX_ByteTextBuf& textBuf = pSAXContext->m_TextBuf;
if (pSAXContext->m_eNode == FX_SAXNODE_Instruction) {
textBuf << "?>";
} else if (pSAXContext->m_eNode == FX_SAXNODE_Tag) {
textBuf << "></" << pSAXContext->m_bsTagName.AsByteStringC() << ">";
}
UpdateChecksum(FALSE);
}
void CXFA_SAXReaderHandler::OnTagEnd(void* pTag,
const CFX_ByteStringC& bsTagName,
uint32_t dwEndPos) {
if (pTag == NULL) {
return;
}
CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
textBuf << "</" << bsTagName << ">";
UpdateChecksum(FALSE);
}
void CXFA_SAXReaderHandler::OnTargetData(void* pTag,
FX_SAXNODE eType,
const CFX_ByteStringC& bsData,
uint32_t dwStartPos) {
if (pTag == NULL && eType != FX_SAXNODE_Comment) {
return;
}
if (eType == FX_SAXNODE_Comment) {
CFX_ByteTextBuf& textBuf = m_SAXContext.m_TextBuf;
textBuf << "<!--" << bsData << "-->";
UpdateChecksum(FALSE);
} else {
CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
textBuf << " " << bsData;
}
}
void CXFA_SAXReaderHandler::UpdateChecksum(FX_BOOL bCheckSpace) {
int32_t iLength = m_SAXContext.m_TextBuf.GetLength();
if (iLength < 1) {
return;
}
uint8_t* pBuffer = m_SAXContext.m_TextBuf.GetBuffer();
FX_BOOL bUpdata = TRUE;
if (bCheckSpace) {
bUpdata = FALSE;
for (int32_t i = 0; i < iLength; i++) {
bUpdata = (pBuffer[i] > 0x20);
if (bUpdata) {
break;
}
}
}
if (bUpdata) {
m_pContext->Update(CFX_ByteStringC(pBuffer, iLength));
}
m_SAXContext.m_TextBuf.Clear();
}
CXFA_ChecksumContext::CXFA_ChecksumContext()
: m_pSAXReader(NULL), m_pByteContext(NULL) {}
CXFA_ChecksumContext::~CXFA_ChecksumContext() {
FinishChecksum();
}
FX_BOOL CXFA_ChecksumContext::StartChecksum() {
FinishChecksum();
m_pByteContext = FX_Alloc(uint8_t, 128);
CRYPT_SHA1Start(m_pByteContext);
m_bsChecksum.Empty();
m_pSAXReader = FX_SAXReader_Create();
return m_pSAXReader != NULL;
}
FX_BOOL CXFA_ChecksumContext::UpdateChecksum(IFX_FileRead* pSrcFile,
FX_FILESIZE offset,
size_t size) {
if (m_pSAXReader == NULL) {
return FALSE;
}
if (pSrcFile == NULL) {
return FALSE;
}
if (size < 1) {
size = pSrcFile->GetSize();
}
CXFA_SAXReaderHandler handler(this);
m_pSAXReader->SetHandler(&handler);
if (m_pSAXReader->StartParse(
pSrcFile, (uint32_t)offset, (uint32_t)size,
FX_SAXPARSEMODE_NotSkipSpace | FX_SAXPARSEMODE_NotConvert_amp |
FX_SAXPARSEMODE_NotConvert_lt | FX_SAXPARSEMODE_NotConvert_gt |
FX_SAXPARSEMODE_NotConvert_sharp) < 0) {
return FALSE;
}
return m_pSAXReader->ContinueParse(NULL) > 99;
}
void CXFA_ChecksumContext::FinishChecksum() {
if (m_pSAXReader) {
m_pSAXReader->Release();
m_pSAXReader = NULL;
}
if (m_pByteContext) {
uint8_t digest[20];
FXSYS_memset(digest, 0, 20);
CRYPT_SHA1Finish(m_pByteContext, digest);
int32_t nLen = FX_Base64EncodeA(digest, 20, NULL);
FX_CHAR* pBuffer = m_bsChecksum.GetBuffer(nLen);
FX_Base64EncodeA(digest, 20, pBuffer);
m_bsChecksum.ReleaseBuffer(nLen);
FX_Free(m_pByteContext);
m_pByteContext = NULL;
}
}
void CXFA_ChecksumContext::GetChecksum(CFX_ByteString& bsChecksum) {
bsChecksum = m_bsChecksum;
}
void CXFA_ChecksumContext::Update(const CFX_ByteStringC& bsText) {
if (m_pByteContext) {
CRYPT_SHA1Update(m_pByteContext, bsText.raw_str(), bsText.GetLength());
}
}
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