Allow for a global trustlist.

1 files changed, 136 insertions, 0 deletions

diff --git a/common/convert.c b/common/convert.c
new file mode 100644
index 000000000..66f612063
--- /dev/null
+++ b/common/convert.c
@@ -0,0 +1,136 @@
+/* convert.c - Hex conversion functions.
+ *	Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "util.h"
+
+
+#define tohex(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'A'))
+
+
+/* Convert STRING consisting of hex characters into its binary representation
+   and store that at BUFFER.  BUFFER needs to be of LENGTH bytes.  The
+   function check that the STRING will convert exactly to LENGTH
+   bytes. Colons inbetween the hex digits are allowed, if one colon
+   has been given a colon is expected very 2 characters. The string
+   is delimited by either end of string or a white space character.
+   The function returns -1 on error or the length of the parsed
+   string.  */
+int
+hexcolon2bin (const char *string, void *buffer, size_t length)
+{
+  int i;
+  const char *s = string;
+  int need_colon = 0;
+
+  for (i=0; i < length; )
+    {
+      if (i==1 && *s == ':')  /* Skip colons between hex digits.  */
+        {
+          need_colon = 1;
+          s++;
+        }
+      else if (need_colon && *s == ':')
+        s++;
+      else if (need_colon)
+        return -1;           /* Colon expected. */
+      if (!hexdigitp (s) || !hexdigitp (s+1))
+        return -1;           /* Invalid hex digits. */
+      ((unsigned char*)buffer)[i++] = xtoi_2 (s);
+      s += 2;
+    }
+  if (*s == ':')
+    return -1;             /* Trailing colons are not allowed.  */
+  if (*s && (!isascii (*s) || !isspace (*s)) )
+    return -1;             /* Not followed by Nul or white space.  */
+  if (i != length)
+    return -1;             /* Not of expected length.  */
+  if (*s)
+    s++; /* Skip the delimiter. */
+  return s - string;
+}
+
+
+
+static char *
+do_bin2hex (const void *buffer, size_t length, char *stringbuf, int with_colon)
+{
+  const unsigned char *s;
+  char *p;
+  
+  if (!stringbuf)
+    {
+      /* Not really correct for with_colon but we don't care about the
+         one wasted byte. */
+      size_t n = with_colon? 3:2; 
+      size_t nbytes = n * length + 1; 
+      if (length &&  (nbytes-1) / n != length) 
+        {
+          errno = ENOMEM;
+          return NULL;
+        }
+      stringbuf = xtrymalloc (nbytes);
+      if (!stringbuf)
+        return NULL;
+    }
+  
+  for (s = buffer, p = stringbuf; length; length--, s++)
+    {
+      if (with_colon && s != buffer)
+        *p++ = ':';
+      *p++ = tohex ((*s>>4)&15);
+      *p++ = tohex (*s&15);
+    }
+  *p = 0;
+
+  return stringbuf;
+}
+
+
+/* Convert LENGTH bytes of data in BUFFER into hex encoding and store
+   that at the provided STRINGBUF.  STRINGBUF must be allocated of at
+   least (2*LENGTH+1) bytes or be NULL so that the function mallocs an
+   appropriate buffer.  Returns STRINGBUF or NULL on error (which may
+   only occur if STRINGBUF has been NULL and the internal malloc
+   failed). */
+char *
+bin2hex (const void *buffer, size_t length, char *stringbuf)
+{
+  return do_bin2hex (buffer, length, stringbuf, 0);
+}
+
+/* Convert LENGTH bytes of data in BUFFER into hex encoding and store
+   that at the provided STRINGBUF.  STRINGBUF must be allocated of at
+   least (3*LENGTH+1) bytes or be NULL so that the function mallocs an
+   appropriate buffer.  Returns STRINGBUF or NULL on error (which may
+   only occur if STRINGBUF has been NULL and the internal malloc
+   failed). */
+char *
+bin2hexcolon (const void *buffer, size_t length, char *stringbuf)
+{
+  return do_bin2hex (buffer, length, stringbuf, 1);
+}
+
+