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 #ifdef HAVE_SYS_TYPES_H
29 # include <sys/types.h>
36 /* Read up to SIZE bytes into buffer BUFFER from the data object with
37 the handle DH. Return the number of characters read, 0 on EOF and
38 -1 on error. If an error occurs, errno is set. */
39 typedef gpgme_ssize_t (*gpgme_data_read_cb) (gpgme_data_t dh,
43 /* Write up to SIZE bytes from buffer BUFFER to the data object with
44 the handle DH. Return the number of characters written, or -1 on
45 error. If an error occurs, errno is set. */
46 typedef gpgme_ssize_t (*gpgme_data_write_cb) (gpgme_data_t dh,
50 /* Set the current position from where the next read or write starts
51 in the data object with the handle DH to OFFSET, relativ to
53 typedef gpgme_off_t (*gpgme_data_seek_cb) (gpgme_data_t dh,
57 /* Release the data object with the handle DH. */
58 typedef void (*gpgme_data_release_cb) (gpgme_data_t dh);
60 /* Get the FD associated with the handle DH, or -1. */
61 typedef int (*gpgme_data_get_fd_cb) (gpgme_data_t dh);
63 struct _gpgme_data_cbs
65 gpgme_data_read_cb read;
66 gpgme_data_write_cb write;
67 gpgme_data_seek_cb seek;
68 gpgme_data_release_cb release;
69 gpgme_data_get_fd_cb get_fd;
74 struct _gpgme_data_cbs *cbs;
75 gpgme_data_encoding_t encoding;
78 #define BUFFER_SIZE PIPE_BUF
80 #ifdef _POSIX_PIPE_BUF
81 #define BUFFER_SIZE _POSIX_PIPE_BUF
83 #define BUFFER_SIZE 512
86 char pending[BUFFER_SIZE];
89 /* File name of the data object. */
92 /* Hint on the to be expected toatl size of the data. */
93 gpgme_off_t size_hint;
97 /* For gpgme_data_new_from_fd. */
100 /* For gpgme_data_new_from_stream. */
103 /* For gpgme_data_new_from_cbs. */
106 gpgme_data_cbs_t cbs;
110 /* For gpgme_data_new_from_mem. */
114 const char *orig_buffer;
115 /* Allocated size of BUFFER. */
121 /* For gpgme_data_new_from_read_cb. */
124 int (*cb) (void *, char *, size_t, size_t *);
131 gpgme_error_t _gpgme_data_new (gpgme_data_t *r_dh,
132 struct _gpgme_data_cbs *cbs);
134 void _gpgme_data_release (gpgme_data_t dh);
136 /* Get the file descriptor associated with DH, if possible. Otherwise
138 int _gpgme_data_get_fd (gpgme_data_t dh);
140 /* Get the size-hint value for DH or 0 if not available. */
141 gpgme_off_t _gpgme_data_get_size_hint (gpgme_data_t dh);