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// 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
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