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/* data-compat.c - Compatibility interfaces for data objects.
Copyright (C) 2002, 2003, 2004 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stdlib.h>
#include "data.h"
#include "util.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 *dh, const char *fname,
FILE *stream, off_t offset, size_t length)
{
gpgme_error_t err;
char *buf = NULL;
int res;
if (stream && fname)
return gpg_error (GPG_ERR_INV_VALUE);
if (fname)
stream = fopen (fname, "rb");
if (!stream)
return gpg_error_from_errno (errno);
#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_errno = errno;
if (fname)
fclose (stream);
return gpg_error_from_errno (saved_errno);
}
buf = malloc (length);
if (!buf)
{
int saved_errno = errno;
if (fname)
fclose (stream);
return gpg_error_from_errno (saved_errno);
}
while (fread (buf, length, 1, stream) < 1
&& ferror (stream) && errno == EINTR);
if (ferror (stream))
{
int saved_errno = errno;
if (buf)
free (buf);
if (fname)
fclose (stream);
return gpg_error_from_errno (saved_errno);
}
if (fname)
fclose (stream);
err = gpgme_data_new (dh);
if (err)
{
if (buf)
free (buf);
return err;
}
(*dh)->data.mem.buffer = buf;
(*dh)->data.mem.size = length;
(*dh)->data.mem.length = length;
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 *dh, const char *fname, int copy)
{
struct stat statbuf;
if (!fname || !copy)
return gpg_error (GPG_ERR_INV_VALUE);
if (stat (fname, &statbuf) < 0)
return gpg_error_from_errno (errno);
return gpgme_data_new_from_filepart (dh, fname, NULL, 0, statbuf.st_size);
}
static int
gpgme_error_to_errno (gpgme_error_t err)
{
int no = gpg_err_code_to_errno (err);
if (no)
{
errno = no;
return -1;
}
switch (gpg_err_code (err))
{
case GPG_ERR_EOF:
return 0;
case GPG_ERR_INV_VALUE:
errno = EINVAL;
return -1;
case GPG_ERR_NOT_SUPPORTED:
errno = ENOSYS;
return -1;
default:
/* FIXME: Yeah, well. */
errno = EINVAL;
return -1;
}
}
static ssize_t
old_user_read (gpgme_data_t dh, void *buffer, size_t size)
{
size_t amt;
gpgme_error_t err = (*dh->data.old_user.cb) (dh->data.old_user.handle,
buffer, size, &amt);
if (err)
return gpgme_error_to_errno (err);
return amt;
}
static off_t
old_user_seek (gpgme_data_t dh, off_t offset, int whence)
{
gpgme_error_t err;
if (whence != SEEK_SET || offset)
return EINVAL;
err = (*dh->data.old_user.cb) (dh->data.old_user.handle, NULL, 0, NULL);
if (err)
return gpgme_error_to_errno (err);
return 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 *dh,
int (*read_cb) (void *, char *, size_t, size_t *),
void *read_cb_value)
{
gpgme_error_t err = _gpgme_data_new (dh, &old_user_cbs);
if (err)
return err;
(*dh)->data.old_user.cb = read_cb;
(*dh)->data.old_user.handle = read_cb_value;
return 0;
}
gpgme_error_t
gpgme_data_rewind (gpgme_data_t dh)
{
return (gpgme_data_seek (dh, 0, SEEK_SET) == -1)
? gpg_error_from_errno (errno) : 0;
}
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