412ccb3b47
* data.h, data-user.c, data-stream.c, data-mem.c, data-fd.c, data-compat.c: New file. Really check them in this time, completes 2002-10-08 change.
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/* data.h - Internal data object abstraction interface.
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* Copyright (C) 2002 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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* GPGME is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GPGME is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef DATA_H
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#define DATA_H
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/types.h>
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#include <limits.h>
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#include "gpgme.h"
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/* Read up to SIZE bytes into buffer BUFFER from the data object with
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the handle DH. Return the number of characters read, 0 on EOF and
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-1 on error. If an error occurs, errno is set. */
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typedef int (*gpgme_data_read_cb) (GpgmeData dh, void *buffer, size_t size);
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/* Write up to SIZE bytes from buffer BUFFER to the data object with
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the handle DH. Return the number of characters written, or -1 on
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error. If an error occurs, errno is set. */
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typedef ssize_t (*gpgme_data_write_cb) (GpgmeData dh, const void *buffer,
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size_t size);
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/* Set the current position from where the next read or write starts
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in the data object with the handle DH to OFFSET, relativ to
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WHENCE. */
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typedef off_t (*gpgme_data_seek_cb) (GpgmeData dh, off_t offset, int whence);
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/* Release the data object with the handle DH. */
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typedef int (*gpgme_data_release_cb) (GpgmeData dh);
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struct gpgme_data_cbs
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{
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gpgme_data_read_cb read;
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gpgme_data_write_cb write;
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gpgme_data_seek_cb seek;
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gpgme_data_release_cb release;
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};
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struct gpgme_data_s
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{
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struct gpgme_data_cbs *cbs;
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GpgmeDataEncoding encoding;
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#ifdef PIPE_BUF
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#define BUFFER_SIZE PIPE_BUF
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#else
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#ifdef _POSIX_PIPE_BUF
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#define BUFFER_SIZE _POSIX_PIPE_BUF
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#else
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#define BUFFER_SIZE 512
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#endif
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#endif
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char pending[BUFFER_SIZE];
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int pending_len;
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union
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{
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/* For gpgme_data_new_from_fd. */
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int fd;
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/* For gpgme_data_new_from_stream. */
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FILE *stream;
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/* For gpgme_data_new_from_cbs. */
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struct
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{
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struct GpgmeDataCbs *cbs;
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void *handle;
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} user;
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/* For gpgme_data_new_from_mem. */
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struct
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{
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char *buffer;
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const char *orig_buffer;
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/* Allocated size of BUFFER. */
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size_t size;
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size_t length;
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size_t offset;
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} mem;
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/* For gpgme_data_new_from_read_cb. */
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struct
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{
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int (*cb) (void *, char *, size_t, size_t *);
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void *handle;
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} old_user;
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} data;
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};
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GpgmeError _gpgme_data_new (GpgmeData *r_dh, struct gpgme_data_cbs *cbs);
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void _gpgme_data_release (GpgmeData dh);
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#endif /* DATA_H */
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