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Diffstat (limited to 'usr.bin/asn1_compile/gen_decode.c')
-rw-r--r--usr.bin/asn1_compile/gen_decode.c396
1 files changed, 396 insertions, 0 deletions
diff --git a/usr.bin/asn1_compile/gen_decode.c b/usr.bin/asn1_compile/gen_decode.c
new file mode 100644
index 00000000000..27881adc431
--- /dev/null
+++ b/usr.bin/asn1_compile/gen_decode.c
@@ -0,0 +1,396 @@
+/*
+ * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "gen_locl.h"
+
+/*
+RCSID("$KTH: gen_decode.c,v 1.18 2002/08/09 15:37:34 joda Exp $");
+*/
+
+static void
+decode_primitive (const char *typename, const char *name)
+{
+ fprintf (codefile,
+ "e = decode_%s(p, len, %s, &l);\n"
+ "FORW;\n",
+ typename,
+ name);
+}
+
+static void
+decode_type (const char *name, const Type *t)
+{
+ switch (t->type) {
+ case TType:
+#if 0
+ decode_type (name, t->symbol->type);
+#endif
+ fprintf (codefile,
+ "e = decode_%s(p, len, %s, &l);\n"
+ "FORW;\n",
+ t->symbol->gen_name, name);
+ break;
+ case TInteger:
+ if(t->members == NULL)
+ decode_primitive ("integer", name);
+ else {
+ char *s;
+ asprintf(&s, "(int*)%s", name);
+ if(s == NULL)
+ errx (1, "out of memory");
+ decode_primitive ("integer", s);
+ free(s);
+ }
+ break;
+ case TUInteger:
+ decode_primitive ("unsigned", name);
+ break;
+ case TEnumerated:
+ decode_primitive ("enumerated", name);
+ break;
+ case TOctetString:
+ decode_primitive ("octet_string", name);
+ break;
+ case TOID :
+ decode_primitive ("oid", name);
+ break;
+ case TBitString: {
+ Member *m;
+ int tag = -1;
+ int pos;
+
+ fprintf (codefile,
+ "e = der_match_tag_and_length (p, len, UNIV, PRIM, UT_BitString,"
+ "&reallen, &l);\n"
+ "FORW;\n"
+ "if(len < reallen)\n"
+ "return ASN1_OVERRUN;\n"
+ "p++;\n"
+ "len--;\n"
+ "reallen--;\n"
+ "ret++;\n");
+ pos = 0;
+ for (m = t->members; m && tag != m->val; m = m->next) {
+ while (m->val / 8 > pos / 8) {
+ fprintf (codefile,
+ "p++; len--; reallen--; ret++;\n");
+ pos += 8;
+ }
+ fprintf (codefile,
+ "%s->%s = (*p >> %d) & 1;\n",
+ name, m->gen_name, 7 - m->val % 8);
+ if (tag == -1)
+ tag = m->val;
+ }
+ fprintf (codefile,
+ "p += reallen; len -= reallen; ret += reallen;\n");
+ break;
+ }
+ case TSequence: {
+ Member *m;
+ int tag = -1;
+
+ if (t->members == NULL)
+ break;
+
+ fprintf (codefile,
+ "e = der_match_tag_and_length (p, len, UNIV, CONS, UT_Sequence,"
+ "&reallen, &l);\n"
+ "FORW;\n"
+ "{\n"
+ "int dce_fix;\n"
+ "if((dce_fix = fix_dce(reallen, &len)) < 0)\n"
+ "return ASN1_BAD_FORMAT;\n");
+
+ for (m = t->members; m && tag != m->val; m = m->next) {
+ char *s;
+
+ asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name);
+ if (0 && m->type->type == TType){
+ if(m->optional)
+ fprintf (codefile,
+ "%s = malloc(sizeof(*%s));\n"
+ "if(%s == NULL) return ENOMEM;\n", s, s, s);
+ fprintf (codefile,
+ "e = decode_seq_%s(p, len, %d, %d, %s, &l);\n",
+ m->type->symbol->gen_name,
+ m->val,
+ m->optional,
+ s);
+ if(m->optional)
+ fprintf (codefile,
+ "if (e == ASN1_MISSING_FIELD) {\n"
+ "free(%s);\n"
+ "%s = NULL;\n"
+ "e = l = 0;\n"
+ "}\n",
+ s, s);
+
+ fprintf (codefile, "FORW;\n");
+
+ }else{
+ fprintf (codefile, "{\n"
+ "size_t newlen, oldlen;\n\n"
+ "e = der_match_tag (p, len, CONTEXT, CONS, %d, &l);\n",
+ m->val);
+ fprintf (codefile,
+ "if (e)\n");
+ if(m->optional)
+ /* XXX should look at e */
+ fprintf (codefile,
+ "%s = NULL;\n", s);
+ else
+ fprintf (codefile,
+ "return e;\n");
+ fprintf (codefile,
+ "else {\n");
+ fprintf (codefile,
+ "p += l;\n"
+ "len -= l;\n"
+ "ret += l;\n"
+ "e = der_get_length (p, len, &newlen, &l);\n"
+ "FORW;\n"
+ "{\n"
+
+ "int dce_fix;\n"
+ "oldlen = len;\n"
+ "if((dce_fix = fix_dce(newlen, &len)) < 0)"
+ "return ASN1_BAD_FORMAT;\n");
+ if (m->optional)
+ fprintf (codefile,
+ "%s = malloc(sizeof(*%s));\n"
+ "if(%s == NULL) return ENOMEM;\n", s, s, s);
+ decode_type (s, m->type);
+ fprintf (codefile,
+ "if(dce_fix){\n"
+ "e = der_match_tag_and_length (p, len, "
+ "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n"
+ "FORW;\n"
+ "}else \n"
+ "len = oldlen - newlen;\n"
+ "}\n"
+ "}\n");
+ fprintf (codefile,
+ "}\n");
+ }
+ if (tag == -1)
+ tag = m->val;
+ free (s);
+ }
+ fprintf(codefile,
+ "if(dce_fix){\n"
+ "e = der_match_tag_and_length (p, len, "
+ "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n"
+ "FORW;\n"
+ "}\n"
+ "}\n");
+
+ break;
+ }
+ case TSequenceOf: {
+ char *n;
+
+ fprintf (codefile,
+ "e = der_match_tag_and_length (p, len, UNIV, CONS, UT_Sequence,"
+ "&reallen, &l);\n"
+ "FORW;\n"
+ "if(len < reallen)\n"
+ "return ASN1_OVERRUN;\n"
+ "len = reallen;\n");
+
+ fprintf (codefile,
+ "{\n"
+ "size_t origlen = len;\n"
+ "int oldret = ret;\n"
+ "ret = 0;\n"
+ "(%s)->len = 0;\n"
+ "(%s)->val = NULL;\n"
+ "while(ret < origlen) {\n"
+ "(%s)->len++;\n"
+ "(%s)->val = realloc((%s)->val, sizeof(*((%s)->val)) * (%s)->len);\n",
+ name, name, name, name, name, name, name);
+ asprintf (&n, "&(%s)->val[(%s)->len-1]", name, name);
+ decode_type (n, t->subtype);
+ fprintf (codefile,
+ "len = origlen - ret;\n"
+ "}\n"
+ "ret += oldret;\n"
+ "}\n");
+ free (n);
+ break;
+ }
+ case TGeneralizedTime:
+ decode_primitive ("generalized_time", name);
+ break;
+ case TGeneralString:
+ decode_primitive ("general_string", name);
+ break;
+ case TApplication:
+ fprintf (codefile,
+ "e = der_match_tag_and_length (p, len, APPL, CONS, %d, "
+ "&reallen, &l);\n"
+ "FORW;\n"
+ "{\n"
+ "int dce_fix;\n"
+ "if((dce_fix = fix_dce(reallen, &len)) < 0)\n"
+ "return ASN1_BAD_FORMAT;\n",
+ t->application);
+ decode_type (name, t->subtype);
+ fprintf(codefile,
+ "if(dce_fix){\n"
+ "e = der_match_tag_and_length (p, len, "
+ "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n"
+ "FORW;\n"
+ "}\n"
+ "}\n");
+
+ break;
+ default :
+ abort ();
+ }
+}
+
+void
+generate_type_decode (const Symbol *s)
+{
+ fprintf (headerfile,
+ "int "
+ "decode_%s(const unsigned char *, size_t, %s *, size_t *);\n",
+ s->gen_name, s->gen_name);
+
+ fprintf (codefile, "#define FORW "
+ "if(e) goto fail; "
+ "p += l; "
+ "len -= l; "
+ "ret += l\n\n");
+
+
+ fprintf (codefile, "int\n"
+ "decode_%s(const unsigned char *p,"
+ " size_t len, %s *data, size_t *size)\n"
+ "{\n",
+ s->gen_name, s->gen_name);
+
+ switch (s->type->type) {
+ case TInteger:
+ case TUInteger:
+ case TOctetString:
+ case TOID:
+ case TGeneralizedTime:
+ case TGeneralString:
+ case TBitString:
+ case TSequence:
+ case TSequenceOf:
+ case TApplication:
+ case TType:
+ fprintf (codefile,
+ "size_t ret = 0, reallen;\n"
+ "size_t l;\n"
+ "int e;\n\n");
+ fprintf (codefile, "memset(data, 0, sizeof(*data));\n");
+ fprintf (codefile, "reallen = 0;\n"); /* hack to avoid `unused variable' */
+
+ decode_type ("data", s->type);
+ fprintf (codefile,
+ "if(size) *size = ret;\n"
+ "return 0;\n");
+ fprintf (codefile,
+ "fail:\n"
+ "free_%s(data);\n"
+ "return e;\n",
+ s->gen_name);
+ break;
+ default:
+ abort ();
+ }
+ fprintf (codefile, "}\n\n");
+}
+
+void
+generate_seq_type_decode (const Symbol *s)
+{
+ fprintf (headerfile,
+ "int decode_seq_%s(const unsigned char *, size_t, int, int, "
+ "%s *, size_t *);\n",
+ s->gen_name, s->gen_name);
+
+ fprintf (codefile, "int\n"
+ "decode_seq_%s(const unsigned char *p, size_t len, int tag, "
+ "int optional, %s *data, size_t *size)\n"
+ "{\n",
+ s->gen_name, s->gen_name);
+
+ fprintf (codefile,
+ "size_t newlen, oldlen;\n"
+ "size_t l, ret = 0;\n"
+ "int e;\n"
+ "int dce_fix;\n");
+
+ fprintf (codefile,
+ "e = der_match_tag(p, len, CONTEXT, CONS, tag, &l);\n"
+ "if (e)\n"
+ "return e;\n");
+ fprintf (codefile,
+ "p += l;\n"
+ "len -= l;\n"
+ "ret += l;\n"
+ "e = der_get_length(p, len, &newlen, &l);\n"
+ "if (e)\n"
+ "return e;\n"
+ "p += l;\n"
+ "len -= l;\n"
+ "ret += l;\n"
+ "oldlen = len;\n"
+ "if ((dce_fix = fix_dce(newlen, &len)) < 0)\n"
+ "return ASN1_BAD_FORMAT;\n"
+ "e = decode_%s(p, len, data, &l);\n"
+ "if (e)\n"
+ "return e;\n"
+ "p += l;\n"
+ "len -= l;\n"
+ "ret += l;\n"
+ "if (dce_fix) {\n"
+ "size_t reallen;\n\n"
+ "e = der_match_tag_and_length(p, len, "
+ "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n"
+ "if (e)\n"
+ "return e;\n"
+ "ret += l;\n"
+ "}\n",
+ s->gen_name);
+ fprintf (codefile,
+ "if(size) *size = ret;\n"
+ "return 0;\n");
+
+ fprintf (codefile, "}\n\n");
+}
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