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/*
*/
#ifndef rfc822_encode_h
#define rfc822_encode_h
/*
** Copyright 2004 Double Precision, Inc.
** See COPYING for distribution information.
*/
#if HAVE_CONFIG_H
#include "rfc822/config.h"
#endif
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <time.h>
#ifdef __cplusplus
extern "C" {
#endif
struct libmail_encode_info {
char output_buffer[BUFSIZ];
int output_buf_cnt;
char input_buffer[57]; /* For base64 */
int input_buf_cnt;
int (*encoding_func)(struct libmail_encode_info *,
const char *, size_t);
int (*callback_func)(const char *, size_t, void *);
void *callback_arg;
};
const char *libmail_encode_autodetect_fp(FILE *, int, int *);
const char *libmail_encode_autodetect_fpoff(FILE *, int, off_t, off_t, int *);
const char *libmail_encode_autodetect_buf(const char *, int);
void libmail_encode_start(struct libmail_encode_info *info,
const char *transfer_encoding,
int (*callback_func)(const char *, size_t, void *),
void *callback_arg);
int libmail_encode(struct libmail_encode_info *info,
const char *ptr,
size_t cnt);
int libmail_encode_end(struct libmail_encode_info *info);
#ifdef __cplusplus
}
#include <type_traits>
#include <utility>
namespace rfc822 {
// C++ wrapper for libmail_encode()
//
// This is a template, and the template parameters get deduced from
// the constructor's parameter.
//
// The first parameter is an object that's callable with a const char *
// and a size_t parameter, and it gets called, repeatedly, with the
// encoded contents, a chunk at a time (the output object).
//
// If the output object is passed by reference, then the reference
// to the object is saved, and the referenced object must exist
// as long as the encode object is used. If the first parameter is
// passed by value a copy of it gets copied/moved into encode. The
// encode object instance has a conversion operator that returns the
// copy of the output chunk-receiving object, which can be called after
// end() to retrieve its final value, if it has any meaning.
//
// The second parameter specifies the content transfer encoding.
//
// The encode instance is called repeatedly, with const char * and
// size_t parameter to define the unencoded content, in chunks.
// end() gets called to formally define the end of the unencoded
// content. The encoded content is buffered internally and end() will
// likely result in the output object getting called with the final
// encoded contents. The destructor also calls end().
template<typename out_iter_type>
class encode : private libmail_encode_info {
std::conditional_t<
std::is_same_v<out_iter_type, out_iter_type &>,
out_iter_type,
std::remove_cv_t<
std::remove_reference_t<out_iter_type>>
> out_iter;
public:
template<typename T>
encode(T &&out_iter, const char *encoding)
: out_iter{std::forward<T>(out_iter)}
{
libmail_encode_start(
this, encoding,
trampoline,
reinterpret_cast<void *>(this)
);
}
static int trampoline(const char *ptr,
size_t l,
void *voidptr)
{
auto me=reinterpret_cast<encode<out_iter_type> *>(
voidptr
);
me->out_iter(ptr, l);
return 0;
}
void operator()(const char *ptr, size_t cnt)
{
libmail_encode(this, ptr, cnt);
}
void end()
{
libmail_encode_end(this);
}
~encode()
{
end();
}
operator std::remove_cv_t<
std::remove_reference_t<out_iter_type>>() const
{
return out_iter;
}
encode &operator=(const encode &)=delete;
encode(const encode &)=delete;
};
template<typename T>
encode(T &&out_iter, const char *) -> encode<T &&>;
template<typename T>
encode(T &out_iter, const char *) -> encode<T &>;
}
#define rfc2045_encode_h_included 1
#include "rfc2045/rfc2045_encode.h"
#endif
#endif
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