1 /* data.h - Internal data object abstraction interface.
2 Copyright (C) 2002, 2004, 2005 g10 Code GmbH
4 This file is part of GPGME.
6 GPGME is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of
9 the License, or (at your option) any later version.
11 GPGME is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 #include <sys/types.h>
34 /* Read up to SIZE bytes into buffer BUFFER from the data object with
35 the handle DH. Return the number of characters read, 0 on EOF and
36 -1 on error. If an error occurs, errno is set. */
37 typedef ssize_t (*gpgme_data_read_cb) (gpgme_data_t dh, void *buffer,
40 /* Write up to SIZE bytes from buffer BUFFER to the data object with
41 the handle DH. Return the number of characters written, or -1 on
42 error. If an error occurs, errno is set. */
43 typedef ssize_t (*gpgme_data_write_cb) (gpgme_data_t dh, const void *buffer,
46 /* Set the current position from where the next read or write starts
47 in the data object with the handle DH to OFFSET, relativ to
49 typedef off_t (*gpgme_data_seek_cb) (gpgme_data_t dh, off_t offset,
52 /* Release the data object with the handle DH. */
53 typedef void (*gpgme_data_release_cb) (gpgme_data_t dh);
55 /* Get the FD associated with the handle DH, or -1. */
56 typedef int (*gpgme_data_get_fd_cb) (gpgme_data_t dh);
58 struct _gpgme_data_cbs
60 gpgme_data_read_cb read;
61 gpgme_data_write_cb write;
62 gpgme_data_seek_cb seek;
63 gpgme_data_release_cb release;
64 gpgme_data_get_fd_cb get_fd;
69 struct _gpgme_data_cbs *cbs;
70 gpgme_data_encoding_t encoding;
73 #define BUFFER_SIZE PIPE_BUF
75 #ifdef _POSIX_PIPE_BUF
76 #define BUFFER_SIZE _POSIX_PIPE_BUF
78 #define BUFFER_SIZE 512
81 char pending[BUFFER_SIZE];
84 /* File name of the data object. */
89 /* For gpgme_data_new_from_fd. */
92 /* For gpgme_data_new_from_stream. */
95 /* For gpgme_data_new_from_cbs. */
102 /* For gpgme_data_new_from_mem. */
106 const char *orig_buffer;
107 /* Allocated size of BUFFER. */
113 /* For gpgme_data_new_from_read_cb. */
116 int (*cb) (void *, char *, size_t, size_t *);
123 gpgme_error_t _gpgme_data_new (gpgme_data_t *r_dh,
124 struct _gpgme_data_cbs *cbs);
126 void _gpgme_data_release (gpgme_data_t dh);
128 /* Get the file descriptor associated with DH, if possible. Otherwise
130 int _gpgme_data_get_fd (gpgme_data_t dh);