Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_asn1 / lib / secasn1u.c

diff --git a/Security/libsecurity_asn1/lib/secasn1u.c b/Security/libsecurity_asn1/lib/secasn1u.c
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+++ b/Security/libsecurity_asn1/lib/secasn1u.c
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+/*
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ * 
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ * 
+ * The Original Code is the Netscape security libraries.
+ * 
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are 
+ * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
+ * Rights Reserved.
+ * 
+ * Contributor(s):
+ * 
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License Version 2 or later (the
+ * "GPL"), in which case the provisions of the GPL are applicable 
+ * instead of those above.  If you wish to allow use of your 
+ * version of this file only under the terms of the GPL and not to
+ * allow others to use your version of this file under the MPL,
+ * indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by
+ * the GPL.  If you do not delete the provisions above, a recipient
+ * may use your version of this file under either the MPL or the
+ * GPL.
+ */
+
+/*
+ * Utility routines to complement the ASN.1 encoding and decoding functions.
+ *
+ * $Id: secasn1u.c,v 1.3 2004/05/13 15:29:13 dmitch Exp $
+ */
+
+#include "secasn1.h"
+
+
+/*
+ * We have a length that needs to be encoded; how many bytes will the
+ * encoding take?
+ *
+ * The rules are that 0 - 0x7f takes one byte (the length itself is the
+ * entire encoding); everything else takes one plus the number of bytes
+ * in the length.
+ */
+int
+SEC_ASN1LengthLength (unsigned long len)
+{
+    int lenlen = 1;
+
+    if (len > 0x7f) {
+       do {
+           lenlen++;
+           len >>= 8;
+       } while (len);
+    }
+
+    return lenlen;
+}
+
+
+/*
+ * XXX Move over (and rewrite as appropriate) the rest of the
+ * stuff in dersubr.c!
+ */
+
+
+/*
+ * Find the appropriate subtemplate for the given template.
+ * This may involve calling a "chooser" function, or it may just
+ * be right there.  In either case, it is expected to *have* a
+ * subtemplate; this is asserted in debug builds (in non-debug
+ * builds, NULL will be returned).
+ *
+ * "thing" is a pointer to the structure being encoded/decoded
+ * "encoding", when true, means that we are in the process of encoding
+ *     (as opposed to in the process of decoding)
+ */
+const SecAsn1Template *
+SEC_ASN1GetSubtemplate (
+       const SecAsn1Template *theTemplate, 
+       void *thing,
+       PRBool encoding
+       #ifdef  __APPLE__
+       ,
+       const char *buf                 // for decode only
+       #endif
+       )
+{
+    const SecAsn1Template *subt = NULL;
+
+    PORT_Assert (theTemplate->sub != NULL);
+    if (theTemplate->sub != NULL) {
+       if (theTemplate->kind & SEC_ASN1_DYNAMIC) {
+           SecAsn1TemplateChooserPtr chooserp;
+
+           chooserp = *(SecAsn1TemplateChooserPtr *) theTemplate->sub;
+           if (chooserp) {
+                       void *dest = thing;
+                       if (thing != NULL) {
+                               thing = (char *)thing - theTemplate->offset;
+                       }
+                       subt = (* chooserp)(thing, encoding, buf, dest);
+           }
+       } else {
+           subt = (SecAsn1Template*)theTemplate->sub;
+       }
+    }
+    return subt;
+}