|
|
/* data.h - Internal data object abstraction interface.
|
|
|
Copyright (C) 2002, 2004, 2005 g10 Code GmbH
|
|
|
|
|
|
This file is part of GPGME.
|
|
|
|
|
|
GPGME is free software; you can redistribute it and/or modify it
|
|
|
under the terms of the GNU Lesser General Public License as
|
|
|
published by the Free Software Foundation; either version 2.1 of
|
|
|
the License, or (at your option) any later version.
|
|
|
|
|
|
GPGME is distributed in the hope that it will be useful, but
|
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
Lesser General Public License for more details.
|
|
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
|
License along with this program; if not, write to the Free Software
|
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
|
02111-1307, USA. */
|
|
|
|
|
|
#ifndef DATA_H
|
|
|
#define DATA_H
|
|
|
|
|
|
#if HAVE_CONFIG_H
|
|
|
#include <config.h>
|
|
|
#endif
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
#include <limits.h>
|
|
|
|
|
|
#include "gpgme.h"
|
|
|
|
|
|
|
|
|
/* Read up to SIZE bytes into buffer BUFFER from the data object with
|
|
|
the handle DH. Return the number of characters read, 0 on EOF and
|
|
|
-1 on error. If an error occurs, errno is set. */
|
|
|
typedef ssize_t (*gpgme_data_read_cb) (gpgme_data_t dh, void *buffer,
|
|
|
size_t size);
|
|
|
|
|
|
/* Write up to SIZE bytes from buffer BUFFER to the data object with
|
|
|
the handle DH. Return the number of characters written, or -1 on
|
|
|
error. If an error occurs, errno is set. */
|
|
|
typedef ssize_t (*gpgme_data_write_cb) (gpgme_data_t dh, const void *buffer,
|
|
|
size_t size);
|
|
|
|
|
|
/* Set the current position from where the next read or write starts
|
|
|
in the data object with the handle DH to OFFSET, relativ to
|
|
|
WHENCE. */
|
|
|
typedef off_t (*gpgme_data_seek_cb) (gpgme_data_t dh, off_t offset,
|
|
|
int whence);
|
|
|
|
|
|
/* Release the data object with the handle DH. */
|
|
|
typedef void (*gpgme_data_release_cb) (gpgme_data_t dh);
|
|
|
|
|
|
/* Get the FD associated with the handle DH, or -1. */
|
|
|
typedef int (*gpgme_data_get_fd_cb) (gpgme_data_t dh);
|
|
|
|
|
|
struct _gpgme_data_cbs
|
|
|
{
|
|
|
gpgme_data_read_cb read;
|
|
|
gpgme_data_write_cb write;
|
|
|
gpgme_data_seek_cb seek;
|
|
|
gpgme_data_release_cb release;
|
|
|
gpgme_data_get_fd_cb get_fd;
|
|
|
};
|
|
|
|
|
|
struct gpgme_data
|
|
|
{
|
|
|
struct _gpgme_data_cbs *cbs;
|
|
|
gpgme_data_encoding_t encoding;
|
|
|
|
|
|
#ifdef PIPE_BUF
|
|
|
#define BUFFER_SIZE PIPE_BUF
|
|
|
#else
|
|
|
#ifdef _POSIX_PIPE_BUF
|
|
|
#define BUFFER_SIZE _POSIX_PIPE_BUF
|
|
|
#else
|
|
|
#define BUFFER_SIZE 512
|
|
|
#endif
|
|
|
#endif
|
|
|
char pending[BUFFER_SIZE];
|
|
|
int pending_len;
|
|
|
|
|
|
/* File name of the data object. */
|
|
|
char *file_name;
|
|
|
|
|
|
union
|
|
|
{
|
|
|
/* For gpgme_data_new_from_fd. */
|
|
|
int fd;
|
|
|
|
|
|
/* For gpgme_data_new_from_stream. */
|
|
|
FILE *stream;
|
|
|
|
|
|
/* For gpgme_data_new_from_cbs. */
|
|
|
struct
|
|
|
{
|
|
|
gpgme_data_cbs_t cbs;
|
|
|
void *handle;
|
|
|
} user;
|
|
|
|
|
|
/* For gpgme_data_new_from_mem. */
|
|
|
struct
|
|
|
{
|
|
|
char *buffer;
|
|
|
const char *orig_buffer;
|
|
|
/* Allocated size of BUFFER. */
|
|
|
size_t size;
|
|
|
size_t length;
|
|
|
off_t offset;
|
|
|
} mem;
|
|
|
|
|
|
/* For gpgme_data_new_from_read_cb. */
|
|
|
struct
|
|
|
{
|
|
|
int (*cb) (void *, char *, size_t, size_t *);
|
|
|
void *handle;
|
|
|
} old_user;
|
|
|
} data;
|
|
|
};
|
|
|
|
|
|
|
|
|
gpgme_error_t _gpgme_data_new (gpgme_data_t *r_dh,
|
|
|
struct _gpgme_data_cbs *cbs);
|
|
|
|
|
|
void _gpgme_data_release (gpgme_data_t dh);
|
|
|
|
|
|
/* Get the file descriptor associated with DH, if possible. Otherwise
|
|
|
return -1. */
|
|
|
int _gpgme_data_get_fd (gpgme_data_t dh);
|
|
|
|
|
|
#endif /* DATA_H */
|
