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/* data.h - Internal data object abstraction interface.
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Copyright (C) 2002, 2004, 2005 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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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 ssize_t (*gpgme_data_read_cb) (gpgme_data_t dh, void *buffer,
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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) (gpgme_data_t 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) (gpgme_data_t dh, off_t offset,
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int whence);
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/* Release the data object with the handle DH. */
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typedef void (*gpgme_data_release_cb) (gpgme_data_t dh);
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/* Get the FD associated with the handle DH, or -1. */
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typedef int (*gpgme_data_get_fd_cb) (gpgme_data_t 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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gpgme_data_get_fd_cb get_fd;
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};
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struct gpgme_data
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{
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struct _gpgme_data_cbs *cbs;
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gpgme_data_encoding_t 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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/* File name of the data object. */
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char *file_name;
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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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gpgme_data_cbs_t 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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off_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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gpgme_error_t _gpgme_data_new (gpgme_data_t *r_dh,
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struct _gpgme_data_cbs *cbs);
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void _gpgme_data_release (gpgme_data_t dh);
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/* Get the file descriptor associated with DH, if possible. Otherwise
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return -1. */
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int _gpgme_data_get_fd (gpgme_data_t dh);
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#endif /* DATA_H */
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