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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212
|
// files.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#ifndef CRYPTOPP_IMPORTS
#include "files.h"
#include <limits>
NAMESPACE_BEGIN(CryptoPP)
using namespace std;
void Files_TestInstantiations()
{
FileStore f0;
FileSource f1;
FileSink f2;
}
void FileStore::StoreInitialize(const NameValuePairs ¶meters)
{
m_file.reset(new std::ifstream);
const char *fileName;
if (parameters.GetValue(Name::InputFileName(), fileName))
{
ios::openmode binary = parameters.GetValueWithDefault(Name::InputBinaryMode(), true) ? ios::binary : ios::openmode(0);
m_file->open(fileName, ios::in | binary);
if (!*m_file)
throw OpenErr(fileName);
m_stream = m_file.get();
}
else
{
m_stream = NULL;
parameters.GetValue(Name::InputStreamPointer(), m_stream);
}
m_waiting = false;
}
lword FileStore::MaxRetrievable() const
{
if (!m_stream)
return 0;
streampos current = m_stream->tellg();
streampos end = m_stream->seekg(0, ios::end).tellg();
m_stream->seekg(current);
return end-current;
}
size_t FileStore::TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel, bool blocking)
{
if (!m_stream)
{
transferBytes = 0;
return 0;
}
lword size=transferBytes;
transferBytes = 0;
if (m_waiting)
goto output;
while (size && m_stream->good())
{
{
size_t spaceSize = 1024;
m_space = HelpCreatePutSpace(target, channel, 1, UnsignedMin(size_t(0)-1, size), spaceSize);
m_stream->read((char *)m_space, (unsigned int)STDMIN(size, (lword)spaceSize));
}
m_len = m_stream->gcount();
size_t blockedBytes;
output:
blockedBytes = target.ChannelPutModifiable2(channel, m_space, m_len, 0, blocking);
m_waiting = blockedBytes > 0;
if (m_waiting)
return blockedBytes;
size -= m_len;
transferBytes += m_len;
}
if (!m_stream->good() && !m_stream->eof())
throw ReadErr();
return 0;
}
size_t FileStore::CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end, const std::string &channel, bool blocking) const
{
if (!m_stream)
return 0;
if (begin == 0 && end == 1)
{
int result = m_stream->peek();
if (result == char_traits<char>::eof())
return 0;
else
{
size_t blockedBytes = target.ChannelPut(channel, byte(result), blocking);
begin += 1-blockedBytes;
return blockedBytes;
}
}
// TODO: figure out what happens on cin
streampos current = m_stream->tellg();
streampos endPosition = m_stream->seekg(0, ios::end).tellg();
streampos newPosition = current + (streamoff)begin;
if (newPosition >= endPosition)
{
m_stream->seekg(current);
return 0; // don't try to seek beyond the end of file
}
m_stream->seekg(newPosition);
try
{
assert(!m_waiting);
lword copyMax = end-begin;
size_t blockedBytes = const_cast<FileStore *>(this)->TransferTo2(target, copyMax, channel, blocking);
begin += copyMax;
if (blockedBytes)
{
const_cast<FileStore *>(this)->m_waiting = false;
return blockedBytes;
}
}
catch(...)
{
m_stream->clear();
m_stream->seekg(current);
throw;
}
m_stream->clear();
m_stream->seekg(current);
return 0;
}
lword FileStore::Skip(lword skipMax)
{
lword oldPos = m_stream->tellg();
std::istream::off_type offset;
if (!SafeConvert(skipMax, offset))
throw InvalidArgument("FileStore: maximum seek offset exceeded");
m_stream->seekg(offset, ios::cur);
return (lword)m_stream->tellg() - oldPos;
}
void FileSink::IsolatedInitialize(const NameValuePairs ¶meters)
{
m_file.reset(new std::ofstream);
const char *fileName;
if (parameters.GetValue(Name::OutputFileName(), fileName))
{
ios::openmode binary = parameters.GetValueWithDefault(Name::OutputBinaryMode(), true) ? ios::binary : ios::openmode(0);
m_file->open(fileName, ios::out | ios::trunc | binary);
if (!*m_file)
throw OpenErr(fileName);
m_stream = m_file.get();
}
else
{
m_stream = NULL;
parameters.GetValue(Name::OutputStreamPointer(), m_stream);
}
}
bool FileSink::IsolatedFlush(bool hardFlush, bool blocking)
{
if (!m_stream)
throw Err("FileSink: output stream not opened");
m_stream->flush();
if (!m_stream->good())
throw WriteErr();
return false;
}
size_t FileSink::Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
{
if (!m_stream)
throw Err("FileSink: output stream not opened");
while (length > 0)
{
std::streamsize size;
if (!SafeConvert(length, size))
size = numeric_limits<std::streamsize>::max();
m_stream->write((const char *)inString, size);
inString += size;
length -= size;
}
if (messageEnd)
m_stream->flush();
if (!m_stream->good())
throw WriteErr();
return 0;
}
NAMESPACE_END
#endif
|