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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/fxfa/xfa_checksum.h"
#include "core/fdrm/crypto/fx_crypt.h"
namespace {
struct FX_BASE64DATA {
uint32_t data1 : 2;
uint32_t data2 : 6;
uint32_t data3 : 4;
uint32_t data4 : 4;
uint32_t data5 : 6;
uint32_t data6 : 2;
uint32_t data7 : 8;
};
const FX_CHAR g_FXBase64EncoderMap[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/',
};
void Base64EncodePiece(const FX_BASE64DATA& src,
int32_t iBytes,
FX_CHAR dst[4]) {
dst[0] = g_FXBase64EncoderMap[src.data2];
uint32_t b = src.data1 << 4;
if (iBytes > 1) {
b |= src.data4;
}
dst[1] = g_FXBase64EncoderMap[b];
if (iBytes > 1) {
b = src.data3 << 2;
if (iBytes > 2) {
b |= src.data6;
}
dst[2] = g_FXBase64EncoderMap[b];
if (iBytes > 2) {
dst[3] = g_FXBase64EncoderMap[src.data5];
} else {
dst[3] = '=';
}
} else {
dst[2] = dst[3] = '=';
}
}
int32_t Base64EncodeA(const uint8_t* pSrc, int32_t iSrcLen, FX_CHAR* pDst) {
ASSERT(pSrc);
if (iSrcLen < 1) {
return 0;
}
if (!pDst) {
int32_t iDstLen = iSrcLen / 3 * 4;
if ((iSrcLen % 3) != 0) {
iDstLen += 4;
}
return iDstLen;
}
FX_BASE64DATA srcData;
int32_t iBytes = 3;
FX_CHAR* pDstEnd = pDst;
while (iSrcLen > 0) {
if (iSrcLen > 2) {
((uint8_t*)&srcData)[0] = *pSrc++;
((uint8_t*)&srcData)[1] = *pSrc++;
((uint8_t*)&srcData)[2] = *pSrc++;
iSrcLen -= 3;
} else {
*((uint32_t*)&srcData) = 0;
((uint8_t*)&srcData)[0] = *pSrc++;
if (iSrcLen > 1) {
((uint8_t*)&srcData)[1] = *pSrc++;
}
iBytes = iSrcLen;
iSrcLen = 0;
}
Base64EncodePiece(srcData, iBytes, pDstEnd);
pDstEnd += 4;
}
return pDstEnd - pDst;
}
} // namespace
CXFA_SAXReaderHandler::CXFA_SAXReaderHandler(CXFA_ChecksumContext* pContext)
: m_pContext(pContext) {
ASSERT(m_pContext);
}
CXFA_SAXReaderHandler::~CXFA_SAXReaderHandler() {}
CXFA_SAXContext* CXFA_SAXReaderHandler::OnTagEnter(
const CFX_ByteStringC& bsTagName,
CFX_SAXItem::Type eType,
uint32_t dwStartPos) {
UpdateChecksum(TRUE);
if (eType != CFX_SAXItem::Type::Tag &&
eType != CFX_SAXItem::Type::Instruction) {
return nullptr;
}
m_SAXContext.m_eNode = eType;
CFX_ByteTextBuf& textBuf = m_SAXContext.m_TextBuf;
textBuf << "<";
if (eType == CFX_SAXItem::Type::Instruction) {
textBuf << "?";
}
textBuf << bsTagName;
m_SAXContext.m_bsTagName = bsTagName;
return &m_SAXContext;
}
void CXFA_SAXReaderHandler::OnTagAttribute(CXFA_SAXContext* pTag,
const CFX_ByteStringC& bsAttri,
const CFX_ByteStringC& bsValue) {
if (!pTag)
return;
pTag->m_TextBuf << " " << bsAttri << "=\"" << bsValue << "\"";
}
void CXFA_SAXReaderHandler::OnTagBreak(CXFA_SAXContext* pTag) {
if (!pTag)
return;
pTag->m_TextBuf << ">";
UpdateChecksum(FALSE);
}
void CXFA_SAXReaderHandler::OnTagData(CXFA_SAXContext* pTag,
CFX_SAXItem::Type eType,
const CFX_ByteStringC& bsData,
uint32_t dwStartPos) {
if (!pTag)
return;
CFX_ByteTextBuf& textBuf = pTag->m_TextBuf;
if (eType == CFX_SAXItem::Type::CharData)
textBuf << "<![CDATA[";
textBuf << bsData;
if (eType == CFX_SAXItem::Type::CharData)
textBuf << "]]>";
}
void CXFA_SAXReaderHandler::OnTagClose(CXFA_SAXContext* pTag,
uint32_t dwEndPos) {
if (!pTag)
return;
CFX_ByteTextBuf& textBuf = pTag->m_TextBuf;
if (pTag->m_eNode == CFX_SAXItem::Type::Instruction)
textBuf << "?>";
else if (pTag->m_eNode == CFX_SAXItem::Type::Tag)
textBuf << "></" << pTag->m_bsTagName.AsStringC() << ">";
UpdateChecksum(FALSE);
}
void CXFA_SAXReaderHandler::OnTagEnd(CXFA_SAXContext* pTag,
const CFX_ByteStringC& bsTagName,
uint32_t dwEndPos) {
if (!pTag)
return;
pTag->m_TextBuf << "</" << bsTagName << ">";
UpdateChecksum(FALSE);
}
void CXFA_SAXReaderHandler::OnTargetData(CXFA_SAXContext* pTag,
CFX_SAXItem::Type eType,
const CFX_ByteStringC& bsData,
uint32_t dwStartPos) {
if (!pTag && eType != CFX_SAXItem::Type::Comment)
return;
if (eType == CFX_SAXItem::Type::Comment) {
m_SAXContext.m_TextBuf << "<!--" << bsData << "-->";
UpdateChecksum(FALSE);
} else {
pTag->m_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(nullptr), m_pByteContext(nullptr) {}
CXFA_ChecksumContext::~CXFA_ChecksumContext() {
FinishChecksum();
}
void CXFA_ChecksumContext::StartChecksum() {
FinishChecksum();
m_pByteContext = FX_Alloc(uint8_t, 128);
CRYPT_SHA1Start(m_pByteContext);
m_bsChecksum.clear();
m_pSAXReader = new CFX_SAXReader;
}
FX_BOOL CXFA_ChecksumContext::UpdateChecksum(IFX_FileRead* pSrcFile,
FX_FILESIZE offset,
size_t size) {
if (!m_pSAXReader || !pSrcFile)
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,
CFX_SaxParseMode_NotSkipSpace | CFX_SaxParseMode_NotConvert_amp |
CFX_SaxParseMode_NotConvert_lt | CFX_SaxParseMode_NotConvert_gt |
CFX_SaxParseMode_NotConvert_sharp) < 0) {
return FALSE;
}
return m_pSAXReader->ContinueParse(nullptr) > 99;
}
void CXFA_ChecksumContext::FinishChecksum() {
delete m_pSAXReader;
m_pSAXReader = nullptr;
if (m_pByteContext) {
uint8_t digest[20];
FXSYS_memset(digest, 0, 20);
CRYPT_SHA1Finish(m_pByteContext, digest);
int32_t nLen = Base64EncodeA(digest, 20, nullptr);
FX_CHAR* pBuffer = m_bsChecksum.GetBuffer(nLen);
Base64EncodeA(digest, 20, pBuffer);
m_bsChecksum.ReleaseBuffer(nLen);
FX_Free(m_pByteContext);
m_pByteContext = nullptr;
}
}
CFX_ByteString CXFA_ChecksumContext::GetChecksum() const {
return 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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