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/*
* Copyright (C) 2012, 2015 Andrew Ayer
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
*/
#ifndef GIT_CRYPT_FHSTREAM_HPP
#define GIT_CRYPT_FHSTREAM_HPP
#include <ostream>
#include <istream>
#include <streambuf>
/*
* ofhstream
*/
class ofhbuf : public std::streambuf {
enum { default_buffer_size = 8192 };
void* handle;
size_t (*write_fun)(void*, const void*, size_t);
char* buffer;
size_t buffer_size;
inline void reset_buffer ()
{
std::streambuf::setp(buffer, buffer + buffer_size - 1);
}
static inline bool is_eof (int_type ch) { return traits_type::eq_int_type(ch, traits_type::eof()); }
// Disallow copy
#if __cplusplus >= 201103L /* C++11 */
ofhbuf (const ofhbuf&) = delete;
ofhbuf& operator= (const ofhbuf&) = delete;
#else
ofhbuf (const ofhbuf&);
ofhbuf& operator= (const ofhbuf&);
#endif
protected:
virtual int_type overflow (int_type ch =traits_type::eof());
virtual int sync ();
virtual std::streamsize xsputn (const char*, std::streamsize);
virtual std::streambuf* setbuf (char*, std::streamsize);
public:
ofhbuf (void*, size_t (*)(void*, const void*, size_t));
~ofhbuf (); // WARNING: calls sync() and ignores exceptions
};
class ofhstream : public std::ostream {
mutable ofhbuf buf;
public:
ofhstream (void* handle, size_t (*write_fun)(void*, const void*, size_t))
: std::ostream(0), buf(handle, write_fun)
{
std::ostream::rdbuf(&buf);
}
ofhbuf* rdbuf () const { return &buf; }
};
/*
* ifhstream
*/
class ifhbuf : public std::streambuf {
enum {
default_buffer_size = 8192,
putback_size = 4
};
void* handle;
size_t (*read_fun)(void*, void*, size_t);
char* buffer;
size_t buffer_size;
inline void reset_buffer (size_t nputback, size_t nread)
{
std::streambuf::setg(buffer + (putback_size - nputback), buffer + putback_size, buffer + putback_size + nread);
}
// Disallow copy
#if __cplusplus >= 201103L /* C++11 */
ifhbuf (const ifhbuf&) = delete;
ifhbuf& operator= (const ifhbuf&) = delete;
#else
ifhbuf (const ifhbuf&);
ifhbuf& operator= (const ifhbuf&);
#endif
protected:
virtual int_type underflow ();
virtual std::streamsize xsgetn (char*, std::streamsize);
virtual std::streambuf* setbuf (char*, std::streamsize);
public:
ifhbuf (void*, size_t (*)(void*, void*, size_t));
~ifhbuf (); // Can't fail
};
class ifhstream : public std::istream {
mutable ifhbuf buf;
public:
explicit ifhstream (void* handle, size_t (*read_fun)(void*, void*, size_t))
: std::istream(0), buf(handle, read_fun)
{
std::istream::rdbuf(&buf);
}
ifhbuf* rdbuf () const { return &buf; }
};
#endif
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