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-rw-r--r--src/data-compat.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/src/data-compat.c b/src/data-compat.c
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--- /dev/null
+++ b/src/data-compat.c
@@ -0,0 +1,254 @@
+/* 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, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+#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, off_t offset, size_t length)
+{
+#if defined (HAVE_W32CE_SYSTEM) && defined (_MSC_VER)
+ return gpgme_error (GPG_ERR_NOT_IMPLEMENTED);
+#else
+ gpgme_error_t err;
+ char *buf = NULL;
+ int res;
+
+ TRACE_BEG4 (DEBUG_DATA, "gpgme_data_new_from_filepart", r_dh,
+ "file_name=%s, stream=%p, offset=%lli, length=%u",
+ fname, stream, 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_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 TRACE_ERR (gpg_error_from_errno (saved_errno));
+ }
+
+ buf = malloc (length);
+ if (!buf)
+ {
+ int saved_errno = errno;
+ if (fname)
+ fclose (stream);
+ return TRACE_ERR (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 TRACE_ERR (gpg_error_from_errno (saved_errno));
+ }
+
+ 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;
+
+ return TRACE_SUC1 ("r_dh=%p", *r_dh);
+#endif
+}
+
+
+/* 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)
+{
+#if defined (HAVE_W32CE_SYSTEM) && defined (_MSC_VER)
+ return gpgme_error (GPG_ERR_NOT_IMPLEMENTED);
+#else
+ gpgme_error_t err;
+ struct stat statbuf;
+ TRACE_BEG3 (DEBUG_DATA, "gpgme_data_new_from_filepart", 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_errno (errno));
+
+ err = gpgme_data_new_from_filepart (r_dh, fname, NULL, 0, statbuf.st_size);
+ return TRACE_ERR (err);
+#endif
+}
+
+
+static int
+gpgme_error_to_errno (gpgme_error_t err)
+{
+ int res = gpg_err_code_to_errno (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;
+ }
+ }
+ TRACE3 (DEBUG_DATA, "gpgme:gpgme_error_to_errno", 0,
+ "mapping %s <%s> to: %s", gpgme_strerror (err),
+ gpgme_strsource (err), strerror (res));
+ gpg_err_set_errno (res);
+ return res ? -1 : 0;
+}
+
+
+static ssize_t
+old_user_read (gpgme_data_t dh, void *buffer, size_t size)
+{
+ gpgme_error_t err;
+ size_t amt;
+ TRACE_BEG2 (DEBUG_DATA, "gpgme:old_user_read", dh,
+ "buffer=%p, size=%u", 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 (amt);
+}
+
+
+static off_t
+old_user_seek (gpgme_data_t dh, off_t offset, int whence)
+{
+ gpgme_error_t err;
+ TRACE_BEG2 (DEBUG_DATA, "gpgme:old_user_seek", dh,
+ "offset=%llu, whence=%i", 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_BEG2 (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);
+}
+
+
+gpgme_error_t
+gpgme_data_rewind (gpgme_data_t dh)
+{
+ gpgme_error_t err;
+ TRACE_BEG (DEBUG_DATA, "gpgme_data_rewind", dh);
+
+ err = (gpgme_data_seek (dh, 0, SEEK_SET) == -1)
+ ? gpg_error_from_errno (errno) : 0;
+
+ return TRACE_ERR (err);
+}
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