1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
// 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/include/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) {
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.AsStringC() << ">";
}
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(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,
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());
}
}
|
