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/*
* Copyright (c) 2003-2009, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _PYFSTREAM_H
#define _PYFSTREAM_H
// pyofstream
// - a stream that writes on a Python file object
class pyoutbuf : public boost::noncopyable, public std::streambuf
{
pyoutbuf();
protected:
PyFileObject * fo; // Python file object
public:
// constructor
pyoutbuf(PyFileObject * _fo) : fo(_fo) {
TRACE_CTOR(pyoutbuf, "PyFileObject *");
}
~pyoutbuf() throw() {
TRACE_DTOR(pyoutbuf);
}
protected:
// write one character
virtual int_type overflow (int_type c) {
if (c != EOF) {
char z[2];
z[0] = c;
z[1] = '\0';
if (PyFile_WriteString(z, reinterpret_cast<PyObject *>(fo)) < 0) {
return EOF;
}
}
return c;
}
// write multiple characters
virtual std::streamsize xsputn (const char* s, std::streamsize num) {
char * buf = new char[num + 1];
std::strncpy(buf, s, num);
buf[num] = '\0';
if (PyFile_WriteString(buf, reinterpret_cast<PyObject *>(fo)) < 0)
num = 0;
boost::checked_array_delete(buf);
return num;
}
};
class pyofstream : public boost::noncopyable, public std::ostream
{
pyofstream();
protected:
pyoutbuf buf;
public:
pyofstream (PyFileObject * fo) : std::ostream(0), buf(fo) {
TRACE_CTOR(pyofstream, "PyFileObject *");
rdbuf(&buf);
}
~pyofstream() throw() {
TRACE_DTOR(pyofstream);
}
};
// pyifstream
// - a stream that reads on a file descriptor
class pyinbuf : public boost::noncopyable, public std::streambuf
{
pyinbuf();
protected:
PyFileObject * fo; // Python file object
protected:
/* data buffer:
* - at most, pbSize characters in putback area plus
* - at most, bufSize characters in ordinary read buffer
*/
static const int pbSize = 4; // size of putback area
static const int bufSize = 1024; // size of the data buffer
char buffer[bufSize + pbSize]; // data buffer
public:
/* constructor
* - initialize file descriptor
* - initialize empty data buffer
* - no putback area
* => force underflow()
*/
pyinbuf (PyFileObject * _fo) : fo(_fo) {
TRACE_CTOR(pyinbuf, "PyFileObject *");
setg (buffer+pbSize, // beginning of putback area
buffer+pbSize, // read position
buffer+pbSize); // end position
}
~pyinbuf() throw() {
TRACE_DTOR(pyinbuf);
}
protected:
// insert new characters into the buffer
virtual int_type underflow () {
#ifndef _MSC_VER
using std::memmove;
#endif
// is read position before end of buffer?
if (gptr() < egptr()) {
return traits_type::to_int_type(*gptr());
}
/* process size of putback area
* - use number of characters read
* - but at most size of putback area
*/
int numPutback;
numPutback = gptr() - eback();
if (numPutback > pbSize) {
numPutback = pbSize;
}
/* copy up to pbSize characters previously read into
* the putback area
*/
memmove (buffer+(pbSize-numPutback), gptr()-numPutback,
numPutback);
// read at most bufSize new characters
int num;
PyObject *line = PyFile_GetLine(reinterpret_cast<PyObject *>(fo), bufSize);
if (! line || ! PyString_Check(line)) {
// ERROR or EOF
return EOF;
}
num = PyString_Size(line);
if (num == 0)
return EOF;
memmove (buffer+pbSize, PyString_AsString(line), num);
// reset buffer pointers
setg (buffer+(pbSize-numPutback), // beginning of putback area
buffer+pbSize, // read position
buffer+pbSize+num); // end of buffer
// return next character
return traits_type::to_int_type(*gptr());
}
};
class pyifstream : public boost::noncopyable, public std::istream
{
pyifstream();
protected:
pyinbuf buf;
public:
pyifstream (PyFileObject * fo) : std::istream(0), buf(fo) {
TRACE_CTOR(pyifstream, "PyFileObject *");
rdbuf(&buf);
}
~pyifstream() throw() {
TRACE_DTOR(pyifstream);
}
};
#endif // _PYFSTREAM_H
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