Adding upstream version 2.2.27.upstream/2.2.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 266 insertions, 0 deletions

diff --git a/common/convert.c b/common/convert.c
new file mode 100644
index 0000000..6d03adc
--- /dev/null
+++ b/common/convert.c
@@ -0,0 +1,266 @@
+/* convert.c - Hex conversion functions.
+ *	Copyright (C) 2006, 2008 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either
+ *
+ *   - the GNU Lesser General Public License as published by the Free
+ *     Software Foundation; either version 3 of the License, or (at
+ *     your option) any later version.
+ *
+ * or
+ *
+ *   - 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.
+ *
+ * or both in parallel, as here.
+ *
+ * This file 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#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 checks that the STRING will convert
+   exactly to LENGTH bytes. 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
+hex2bin (const char *string, void *buffer, size_t length)
+{
+  int i;
+  const char *s = string;
+
+  for (i=0; i < length; )
+    {
+      if (!hexdigitp (s) || !hexdigitp (s+1))
+        return -1;           /* Invalid hex digits. */
+      ((unsigned char*)buffer)[i++] = xtoi_2 (s);
+      s += 2;
+    }
+  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;
+}
+
+
+/* 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 between 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)
+        {
+          gpg_err_set_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);
+}
+
+
+
+/* Convert HEXSTRING consisting of hex characters into string and
+   store that at BUFFER.  HEXSTRING is either delimited by end of
+   string or a white space character.  The function makes sure that
+   the resulting string in BUFFER is terminated by a Nul byte.  Note
+   that the returned string may include embedded Nul bytes; the extra
+   Nul byte at the end is used to make sure tha the result can always
+   be used as a C-string.
+
+   BUFSIZE is the available length of BUFFER; if the converted result
+   plus a possible required extra Nul character does not fit into this
+   buffer, the function returns NULL and won't change the existing
+   content of BUFFER.  In-place conversion is possible as long as
+   BUFFER points to HEXSTRING.
+
+   If BUFFER is NULL and BUFSIZE is 0 the function scans HEXSTRING but
+   does not store anything.  This may be used to find the end of
+   HEXSTRING.
+
+   On success the function returns a pointer to the next character
+   after HEXSTRING (which is either end-of-string or a the next white
+   space).  If BUFLEN is not NULL the number of valid vytes in BUFFER
+   is stored there (an extra Nul byte is not counted); this will even
+   be done if BUFFER has been passed as NULL. */
+const char *
+hex2str (const char *hexstring, char *buffer, size_t bufsize, size_t *buflen)
+{
+  const char *s = hexstring;
+  int idx, count;
+  int need_nul = 0;
+
+  if (buflen)
+    *buflen = 0;
+
+  for (s=hexstring, count=0; hexdigitp (s) && hexdigitp (s+1); s += 2, count++)
+    ;
+  if (*s && (!isascii (*s) || !isspace (*s)) )
+    {
+      gpg_err_set_errno (EINVAL);
+      return NULL;   /* Not followed by Nul or white space.  */
+    }
+  /* We need to append a nul character.  However we don't want that if
+     the hexstring already ends with "00".  */
+  need_nul = ((s == hexstring) || !(s[-2] == '0' && s[-1] == '0'));
+  if (need_nul)
+    count++;
+
+  if (buffer)
+    {
+      if (count > bufsize)
+        {
+          gpg_err_set_errno (EINVAL);
+          return NULL; /* Too long.  */
+        }
+
+      for (s=hexstring, idx=0; hexdigitp (s) && hexdigitp (s+1); s += 2)
+        ((unsigned char*)buffer)[idx++] = xtoi_2 (s);
+      if (need_nul)
+        buffer[idx] = 0;
+    }
+
+  if (buflen)
+    *buflen = count - need_nul;
+  return s;
+}
+
+
+/* Same as hex2str but this function allocated a new string.  Returns
+   NULL on error.  If R_COUNT is not NULL, the number of scanned bytes
+   will be stored there.  ERRNO is set on error. */
+char *
+hex2str_alloc (const char *hexstring, size_t *r_count)
+{
+  const char *tail;
+  size_t nbytes;
+  char *result;
+
+  tail = hex2str (hexstring, NULL, 0, &nbytes);
+  if (!tail)
+    {
+      if (r_count)
+        *r_count = 0;
+      return NULL;
+    }
+  if (r_count)
+    *r_count = tail - hexstring;
+  result = xtrymalloc (nbytes+1);
+  if (!result)
+    return NULL;
+  if (!hex2str (hexstring, result, nbytes+1, NULL))
+    BUG ();
+  return result;
+}