1 // files.cpp - written and placed in the public domain by Wei Dai
2
3 #include "pch.h"
4
5 #ifndef CRYPTOPP_IMPORTS
6
7 #include "files.h"
8
9 #include <limits>
10
NAMESPACE_BEGIN(CryptoPP)11 NAMESPACE_BEGIN(CryptoPP)
12
13 #if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
14 void Files_TestInstantiations()
15 {
16 FileStore f0;
17 FileSource f1;
18 FileSink f2;
19 }
20 #endif
21
StoreInitialize(const NameValuePairs & parameters)22 void FileStore::StoreInitialize(const NameValuePairs ¶meters)
23 {
24 m_waiting = false;
25 m_stream = NULL;
26 m_file.release();
27
28 const char *fileName = NULL;
29 #if defined(CRYPTOPP_UNIX_AVAILABLE) || _MSC_VER >= 1400
30 const wchar_t *fileNameWide = NULL;
31 if (!parameters.GetValue(Name::InputFileNameWide(), fileNameWide))
32 #endif
33 if (!parameters.GetValue(Name::InputFileName(), fileName))
34 {
35 parameters.GetValue(Name::InputStreamPointer(), m_stream);
36 return;
37 }
38
39 std::ios::openmode binary = parameters.GetValueWithDefault(Name::InputBinaryMode(), true) ? std::ios::binary : std::ios::openmode(0);
40 m_file.reset(new std::ifstream);
41 #ifdef CRYPTOPP_UNIX_AVAILABLE
42 std::string narrowed;
43 if (fileNameWide)
44 fileName = (narrowed = StringNarrow(fileNameWide)).c_str();
45 #endif
46 #if _MSC_VER >= 1400
47 if (fileNameWide)
48 {
49 m_file->open(fileNameWide, std::ios::in | binary);
50 if (!*m_file)
51 throw OpenErr(StringNarrow(fileNameWide, false));
52 }
53 #endif
54 if (fileName)
55 {
56 m_file->open(fileName, std::ios::in | binary);
57 if (!*m_file)
58 throw OpenErr(fileName);
59 }
60 m_stream = m_file.get();
61 }
62
MaxRetrievable() const63 lword FileStore::MaxRetrievable() const
64 {
65 if (!m_stream)
66 return 0;
67
68 std::streampos current = m_stream->tellg();
69 std::streampos end = m_stream->seekg(0, std::ios::end).tellg();
70 m_stream->seekg(current);
71 return end-current;
72 }
73
TransferTo2(BufferedTransformation & target,lword & transferBytes,const std::string & channel,bool blocking)74 size_t FileStore::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
75 {
76 if (!m_stream)
77 {
78 transferBytes = 0;
79 return 0;
80 }
81
82 lword size=transferBytes;
83 transferBytes = 0;
84
85 if (m_waiting)
86 goto output;
87
88 while (size && m_stream->good())
89 {
90 {
91 size_t spaceSize = 1024;
92 m_space = HelpCreatePutSpace(target, channel, 1, UnsignedMin(size_t(SIZE_MAX), size), spaceSize);
93
94 m_stream->read((char *)m_space, (unsigned int)STDMIN(size, (lword)spaceSize));
95 }
96 m_len = (size_t)m_stream->gcount();
97 size_t blockedBytes;
98 output:
99 blockedBytes = target.ChannelPutModifiable2(channel, m_space, m_len, 0, blocking);
100 m_waiting = blockedBytes > 0;
101 if (m_waiting)
102 return blockedBytes;
103 size -= m_len;
104 transferBytes += m_len;
105 }
106
107 if (!m_stream->good() && !m_stream->eof())
108 throw ReadErr();
109
110 return 0;
111 }
112
CopyRangeTo2(BufferedTransformation & target,lword & begin,lword end,const std::string & channel,bool blocking) const113 size_t FileStore::CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end, const std::string &channel, bool blocking) const
114 {
115 if (!m_stream)
116 return 0;
117
118 if (begin == 0 && end == 1)
119 {
120 int result = m_stream->peek();
121 if (result == std::char_traits<char>::eof())
122 return 0;
123 else
124 {
125 size_t blockedBytes = target.ChannelPut(channel, byte(result), blocking);
126 begin += 1-blockedBytes;
127 return blockedBytes;
128 }
129 }
130
131 // TODO: figure out what happens on cin
132 std::streampos current = m_stream->tellg();
133 std::streampos endPosition = m_stream->seekg(0, std::ios::end).tellg();
134 std::streampos newPosition = current + static_cast<std::streamoff>(begin);
135
136 if (newPosition >= endPosition)
137 {
138 m_stream->seekg(current);
139 return 0; // don't try to seek beyond the end of file
140 }
141 m_stream->seekg(newPosition);
142 try
143 {
144 CRYPTOPP_ASSERT(!m_waiting);
145 lword copyMax = end-begin;
146 size_t blockedBytes = const_cast<FileStore *>(this)->TransferTo2(target, copyMax, channel, blocking);
147 begin += copyMax;
148 if (blockedBytes)
149 {
150 const_cast<FileStore *>(this)->m_waiting = false;
151 return blockedBytes;
152 }
153 }
154 catch(...)
155 {
156 m_stream->clear();
157 m_stream->seekg(current);
158 throw;
159 }
160 m_stream->clear();
161 m_stream->seekg(current);
162
163 return 0;
164 }
165
Skip(lword skipMax)166 lword FileStore::Skip(lword skipMax)
167 {
168 if (!m_stream)
169 return 0;
170
171 lword oldPos = m_stream->tellg();
172 std::istream::off_type offset;
173 if (!SafeConvert(skipMax, offset))
174 throw InvalidArgument("FileStore: maximum seek offset exceeded");
175 m_stream->seekg(offset, std::ios::cur);
176 return (lword)m_stream->tellg() - oldPos;
177 }
178
IsolatedInitialize(const NameValuePairs & parameters)179 void FileSink::IsolatedInitialize(const NameValuePairs ¶meters)
180 {
181 m_stream = NULL;
182 m_file.release();
183
184 const char *fileName = NULL;
185 #if defined(CRYPTOPP_UNIX_AVAILABLE) || _MSC_VER >= 1400
186 const wchar_t *fileNameWide = NULL;
187 if (!parameters.GetValue(Name::OutputFileNameWide(), fileNameWide))
188 #endif
189 if (!parameters.GetValue(Name::OutputFileName(), fileName))
190 {
191 parameters.GetValue(Name::OutputStreamPointer(), m_stream);
192 return;
193 }
194
195 std::ios::openmode binary = parameters.GetValueWithDefault(Name::OutputBinaryMode(), true) ? std::ios::binary : std::ios::openmode(0);
196 m_file.reset(new std::ofstream);
197 #ifdef CRYPTOPP_UNIX_AVAILABLE
198 std::string narrowed;
199 if (fileNameWide)
200 fileName = (narrowed = StringNarrow(fileNameWide)).c_str();
201 #elif (CRYPTOPP_MSC_VERSION >= 1400)
202 if (fileNameWide)
203 {
204 m_file->open(fileNameWide, std::ios::out | std::ios::trunc | binary);
205 if (!*m_file)
206 throw OpenErr(StringNarrow(fileNameWide, false));
207 }
208 #endif
209 if (fileName)
210 {
211 m_file->open(fileName, std::ios::out | std::ios::trunc | binary);
212 if (!*m_file)
213 throw OpenErr(fileName);
214 }
215 m_stream = m_file.get();
216 }
217
IsolatedFlush(bool hardFlush,bool blocking)218 bool FileSink::IsolatedFlush(bool hardFlush, bool blocking)
219 {
220 CRYPTOPP_UNUSED(hardFlush), CRYPTOPP_UNUSED(blocking);
221 if (!m_stream)
222 throw Err("FileSink: output stream not opened");
223
224 m_stream->flush();
225 if (!m_stream->good())
226 throw WriteErr();
227
228 return false;
229 }
230
Put2(const byte * inString,size_t length,int messageEnd,bool blocking)231 size_t FileSink::Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
232 {
233 CRYPTOPP_UNUSED(blocking);
234 if (!m_stream)
235 throw Err("FileSink: output stream not opened");
236
237 while (length > 0)
238 {
239 std::streamsize size;
240 if (!SafeConvert(length, size))
241 size = ((std::numeric_limits<std::streamsize>::max)());
242 m_stream->write((const char *)inString, size);
243 inString += size;
244 length -= (size_t)size;
245 }
246
247 if (messageEnd)
248 m_stream->flush();
249
250 if (!m_stream->good())
251 throw WriteErr();
252
253 return 0;
254 }
255
256 NAMESPACE_END
257
258 #endif
259