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/* data-compat.c - Compatibility interfaces for data objects.
* Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
*
* This file is part of GPGME.
*
* GPGME is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* GPGME is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <https://gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#include <stdlib.h>
#include "data.h"
#include "util.h"
#include "debug.h"
/* Create a new data buffer filled with LENGTH bytes starting from
OFFSET within the file FNAME or stream STREAM (exactly one must be
non-zero). */
gpgme_error_t
gpgme_data_new_from_filepart (gpgme_data_t *r_dh, const char *fname,
FILE *stream, gpgme_off_t offset, size_t length)
{
gpgme_error_t err;
char *buf = NULL;
int res;
TRACE_BEG (DEBUG_DATA, "gpgme_data_new_from_filepart", r_dh,
"file_name=%s, stream=%p, offset=%lli, length=%zu",
fname, stream, (long long int)offset, length);
if (stream && fname)
return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
if (fname)
stream = fopen (fname, "rb");
if (!stream)
return TRACE_ERR (gpg_error_from_syserror ());
#ifdef HAVE_FSEEKO
res = fseeko (stream, offset, SEEK_SET);
#else
/* FIXME: Check for overflow, or at least bail at compilation. */
res = fseek (stream, offset, SEEK_SET);
#endif
if (res)
{
int saved_err = gpg_error_from_syserror ();
if (fname)
fclose (stream);
return TRACE_ERR (saved_err);
}
buf = malloc (length);
if (!buf)
{
int saved_err = gpg_error_from_syserror ();
if (fname)
fclose (stream);
return TRACE_ERR (saved_err);
}
while (fread (buf, length, 1, stream) < 1
&& ferror (stream) && errno == EINTR);
if (ferror (stream))
{
int saved_err = gpg_error_from_syserror ();
if (buf)
free (buf);
if (fname)
fclose (stream);
return TRACE_ERR (saved_err);
}
if (fname)
fclose (stream);
err = gpgme_data_new (r_dh);
if (err)
{
if (buf)
free (buf);
return err;
}
(*r_dh)->data.mem.buffer = buf;
(*r_dh)->data.mem.size = length;
(*r_dh)->data.mem.length = length;
TRACE_SUC ("r_dh=%p", *r_dh);
return 0;
}
/* Create a new data buffer filled with the content of file FNAME.
COPY must be non-zero (delayed reads are not supported yet). */
gpgme_error_t
gpgme_data_new_from_file (gpgme_data_t *r_dh, const char *fname, int copy)
{
gpgme_error_t err;
struct stat statbuf;
TRACE_BEG (DEBUG_DATA, "gpgme_data_new_from_file", r_dh,
"file_name=%s, copy=%i (%s)", fname, copy, copy ? "yes" : "no");
if (!fname || !copy)
return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
if (stat (fname, &statbuf) < 0)
return TRACE_ERR (gpg_error_from_syserror ());
err = gpgme_data_new_from_filepart (r_dh, fname, NULL, 0, statbuf.st_size);
return TRACE_ERR (err);
}
static int
gpgme_error_to_errno (gpgme_error_t err)
{
int res = gpg_err_code_to_errno (gpg_err_code (err));
if (!err)
{
switch (gpg_err_code (err))
{
case GPG_ERR_EOF:
res = 0;
break;
case GPG_ERR_INV_VALUE:
res = EINVAL;
break;
case GPG_ERR_NOT_SUPPORTED:
res = ENOSYS;
break;
default:
/* FIXME: Yeah, well. */
res = EINVAL;
break;
}
}
TRACE (DEBUG_DATA, "gpgme:gpgme_error_to_errno", NULL,
"mapping %s <%s> to: %s", gpgme_strerror (err),
gpgme_strsource (err), strerror (res));
gpg_err_set_errno (res);
return res ? -1 : 0;
}
static gpgme_ssize_t
old_user_read (gpgme_data_t dh, void *buffer, size_t size)
{
gpgme_error_t err;
size_t amt;
TRACE_BEG (DEBUG_DATA, "gpgme:old_user_read", dh,
"buffer=%p, size=%zu", buffer, size);
err = (*dh->data.old_user.cb) (dh->data.old_user.handle,
buffer, size, &amt);
if (err)
return TRACE_SYSRES (gpgme_error_to_errno (err));
return TRACE_SYSRES ((int)amt);
}
static gpgme_off_t
old_user_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
{
gpgme_error_t err;
TRACE_BEG (DEBUG_DATA, "gpgme:old_user_seek", dh,
"offset=%llu, whence=%i", (long long int)offset, whence);
if (whence != SEEK_SET || offset)
{
gpg_err_set_errno (EINVAL);
return TRACE_SYSRES (-1);
}
err = (*dh->data.old_user.cb) (dh->data.old_user.handle, NULL, 0, NULL);
if (err)
return TRACE_SYSRES (gpgme_error_to_errno (err));
return TRACE_SYSRES (0);
}
static struct _gpgme_data_cbs old_user_cbs =
{
old_user_read,
NULL,
old_user_seek,
NULL
};
/* Create a new data buffer which retrieves the data from the callback
function READ_CB. */
gpgme_error_t
gpgme_data_new_with_read_cb (gpgme_data_t *r_dh,
int (*read_cb) (void *, char *, size_t, size_t *),
void *read_cb_value)
{
gpgme_error_t err;
TRACE_BEG (DEBUG_DATA, "gpgme_data_new_with_read_cb", r_dh,
"read_cb=%p/%p", read_cb, read_cb_value);
err = _gpgme_data_new (r_dh, &old_user_cbs);
if (err)
return TRACE_ERR (err);
(*r_dh)->data.old_user.cb = read_cb;
(*r_dh)->data.old_user.handle = read_cb_value;
return TRACE_ERR (0);
}
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