20a0d5bab8
* configure.ac: Add invocation of AC_SYS_LARGEFILE, AC_TYPE_OFF_T and AC_FUNC_FSEEKO. doc/ 2004-02-01 Marcus Brinkmann <marcus@g10code.de> * gpgme.texi (Largefile Support): New section. gpgme/ 2004-02-01 Marcus Brinkmann <marcus@g10code.de> * data-compat.c (gpgme_data_new_from_filepart): Call fseeko if available. * data-stream.c (stream_seek): Likewise.
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/* data-stream.c - A stream based data object.
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Copyright (C) 2002, 2004 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 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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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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GPGME; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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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 <stdio.h>
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#include <sys/types.h>
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#include "data.h"
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static ssize_t
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stream_read (gpgme_data_t dh, void *buffer, size_t size)
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{
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size_t amt = fread (buffer, 1, size, dh->data.stream);
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if (amt > 0)
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return amt;
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return ferror (dh->data.stream) ? -1 : 0;
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}
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static ssize_t
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stream_write (gpgme_data_t dh, const void *buffer, size_t size)
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{
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size_t amt = fwrite (buffer, 1, size, dh->data.stream);
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if (amt > 0)
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return amt;
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return ferror (dh->data.stream) ? -1 : 0;
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}
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static off_t
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stream_seek (gpgme_data_t dh, off_t offset, int whence)
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{
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#ifdef HAVE_FSEEKO
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return fseeko (dh->data.stream, offset, whence);
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#else
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/* FIXME: Check for overflow, or at least bail at compilation. */
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return fseek (dh->data.stream, offset, whence);
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#endif
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}
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static struct _gpgme_data_cbs stream_cbs =
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{
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stream_read,
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stream_write,
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stream_seek,
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NULL
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};
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gpgme_error_t
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gpgme_data_new_from_stream (gpgme_data_t *dh, FILE *stream)
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{
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gpgme_error_t err = _gpgme_data_new (dh, &stream_cbs);
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if (err)
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return err;
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(*dh)->data.stream = stream;
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return 0;
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}
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