1 files changed, 102 insertions, 0 deletions
diff --git a/kbx/keybox-file.c b/kbx/keybox-file.c
new file mode 100644
index 000000000..fc9321478
--- /dev/null
+++ b/kbx/keybox-file.c
@@ -0,0 +1,102 @@
+/* keybox-file.c - file oeprations
+ *	Copyright (C) 2001, 2003 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include "keybox-defs.h"
+
+/* Read a block at the current postion and return it in r_blob.
+   r_blob may be NULL to simply skip the current block */
+int
+_keybox_read_blob (KEYBOXBLOB *r_blob, FILE *fp)
+{
+  char *image;
+  size_t imagelen = 0;
+  int c1, c2, c3, c4, type;
+  int rc;
+  off_t off;
+
+ again:
+  *r_blob = NULL;
+  off = ftello (fp);
+  if (off == (off_t)-1)
+    return gpg_error (gpg_err_code_from_errno (errno));
+
+  if ((c1 = getc (fp)) == EOF
+      || (c2 = getc (fp)) == EOF
+      || (c3 = getc (fp)) == EOF
+      || (c4 = getc (fp)) == EOF
+      || (type = getc (fp)) == EOF)
+    {
+      if ( c1 == EOF && !ferror (fp) )
+        return -1; /* eof */
+      return gpg_error (gpg_err_code_from_errno (errno));
+    }
+
+  imagelen = (c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
+  if (imagelen > 500000) /* sanity check */
+    return gpg_error (GPG_ERR_TOO_LARGE);
+  
+  if (imagelen < 5) 
+    return gpg_error (GPG_ERR_TOO_SHORT);
+
+  if (!type)
+    {
+      /* special treatment for empty blobs. */
+      if (fseek (fp, imagelen-5, SEEK_CUR))
+        return gpg_error (gpg_err_code_from_errno (errno));
+      goto again;
+    }
+
+  image = xtrymalloc (imagelen);
+  if (!image) 
+    return gpg_error (gpg_err_code_from_errno (errno));
+
+  image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4; image[4] = type;
+  if (fread (image+5, imagelen-5, 1, fp) != 1)
+    {
+      gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
+      xfree (image);
+      return tmperr;
+    }
+  
+  rc = r_blob? _keybox_new_blob (r_blob, image, imagelen, off) : 0;
+  if (rc || !r_blob)
+        xfree (image);
+  return rc;
+}
+
+
+/* Write the block to the current file position */
+int
+_keybox_write_blob (KEYBOXBLOB blob, FILE *fp)
+{
+  const char *image;
+  size_t length;
+
+  image = _keybox_get_blob_image (blob, &length);
+  if (fwrite (image, length, 1, fp) != 1)
+    return gpg_error (gpg_err_code_from_errno (errno));
+  return 0;
+}