Initial revision
diff --git a/skeletons/NativeInteger.c b/skeletons/NativeInteger.c
new file mode 100644
index 0000000..d42540e
--- /dev/null
+++ b/skeletons/NativeInteger.c
@@ -0,0 +1,193 @@
+/*-
+ * Copyright (c) 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+/*
+ * Please read the NativeInteger.h for the explanation wrt. differences between
+ * INTEGER and NativeInteger.
+ * Basically, both are decoders and encoders of ASN.1 INTEGER type, but this
+ * implementation deals with the standard (machine-specific) representation
+ * of them instead of using the platform-independent buffer.
+ */
+#include <NativeInteger.h>
+#include <INTEGER.h>
+#include <assert.h>
+
+/*
+ * NativeInteger basic type description.
+ */
+static ber_tlv_tag_t asn1_DEF_NativeInteger_tags[] = {
+ (ASN_TAG_CLASS_UNIVERSAL | (2 << 2))
+};
+asn1_TYPE_descriptor_t asn1_DEF_NativeInteger = {
+ "INTEGER", /* The ASN.1 type is still INTEGER */
+ asn_generic_no_constraint,
+ NativeInteger_decode_ber,
+ NativeInteger_encode_der,
+ NativeInteger_print,
+ NativeInteger_free,
+ 0, /* Use generic outmost tag fetcher */
+ asn1_DEF_NativeInteger_tags,
+ sizeof(asn1_DEF_NativeInteger_tags)/sizeof(asn1_DEF_NativeInteger_tags[0]),
+ 1, /* Single UNIVERSAL tag may be implicitly overriden */
+ 0 /* Always in primitive form */
+};
+
+/*
+ * Decode INTEGER type.
+ */
+ber_dec_rval_t
+NativeInteger_decode_ber(asn1_TYPE_descriptor_t *td,
+ void **int_ptr, void *buf_ptr, size_t size, int tag_mode) {
+ int *Int = *int_ptr;
+ ber_dec_rval_t rval;
+ ber_dec_ctx_t ctx = { 0 };
+ ber_tlv_len_t length;
+
+ /*
+ * If the structure is not there, allocate it.
+ */
+ if(Int == NULL) {
+ Int = *int_ptr = CALLOC(1, sizeof(*Int));
+ if(Int == NULL) {
+ rval.code = RC_FAIL;
+ rval.consumed = 0;
+ return rval;
+ }
+ }
+
+ ASN_DEBUG("Decoding %s as INTEGER (tm=%d)",
+ td->name, tag_mode);
+
+ /*
+ * Check tags.
+ */
+ rval = ber_check_tags(td, &ctx,
+ buf_ptr, size, tag_mode, &length, 0);
+ if(rval.code != RC_OK)
+ return rval;
+
+ ASN_DEBUG("%s length is %d bytes", td->name, (int)length);
+
+ /*
+ * Make sure we have this length.
+ */
+ buf_ptr += rval.consumed;
+ size -= rval.consumed;
+ if(length > size) {
+ rval.code = RC_WMORE;
+ rval.consumed = 0;
+ return rval;
+ }
+
+ /*
+ * ASN.1 encoded INTEGER: buf_ptr, length
+ * Fill the Int, at the same time checking for overflow.
+ * If overflow occured, return with RC_FAIL.
+ */
+ {
+ INTEGER_t tmp;
+ long l;
+ tmp.buf = buf_ptr;
+ tmp.size = length;
+
+ if(asn1_INTEGER2long(&tmp, &l)) {
+ rval.code = RC_FAIL;
+ rval.consumed = 0;
+ return rval;
+ }
+
+ *Int = l;
+
+ /*
+ * Note that int might be shorter than long.
+ * This expression hopefully will be optimized away
+ * by compiler.
+ */
+ if(sizeof(int) != sizeof(long) && (*Int != l)) {
+ *Int = 0; /* Safe value */
+ rval.code = RC_FAIL;
+ rval.consumed = 0;
+ return rval;
+ }
+ }
+
+ rval.code = RC_OK;
+ rval.consumed += length;
+
+ ASN_DEBUG("Took %ld/%ld bytes to encode %s (%d)",
+ (long)rval.consumed, (long)length, td->name, *Int);
+
+ return rval;
+}
+
+/*
+ * Encode the NativeInteger using the standard INTEGER type DER encoder.
+ */
+der_enc_rval_t
+NativeInteger_encode_der(asn1_TYPE_descriptor_t *sd, void *ptr,
+ int tag_mode, ber_tlv_tag_t tag,
+ asn_app_consume_bytes_f *cb, void *app_key) {
+ unsigned int Int = *(unsigned int *)ptr; /* Disable sign ext. */
+ der_enc_rval_t erval;
+ INTEGER_t tmp;
+
+#ifdef WORDS_BIGENDIAN /* Opportunistic optimization */
+
+ tmp.buf = ∬
+ tmp.size = sizeof(Int);
+
+#else /* Works even if WORDS_BIGENDIAN is not set where should've been */
+ uint8_t buf[sizeof(int)];
+ uint8_t *p;
+
+ /* Prepare fake INTEGER */
+ for(p = buf + sizeof(buf) - 1; p >= buf; p--, Int >>= 8)
+ *p = Int & 0xff;
+
+ tmp.buf = buf;
+ tmp.size = sizeof(buf);
+#endif /* WORDS_BIGENDIAN */
+
+ /* Encode fake INTEGER */
+ erval = INTEGER_encode_der(sd, &tmp, tag_mode, tag, cb, app_key);
+ if(erval.encoded == -1) {
+ assert(erval.structure_ptr == &tmp);
+ erval.structure_ptr = ptr;
+ }
+ return erval;
+}
+
+/*
+ * INTEGER specific human-readable output.
+ */
+int
+NativeInteger_print(asn1_TYPE_descriptor_t *td, const void *sptr, int ilevel,
+ asn_app_consume_bytes_f *cb, void *app_key) {
+ const int *Int = sptr;
+ char scratch[32];
+ int ret;
+
+ if(Int) {
+ ret = snprintf(scratch, sizeof(scratch), "%d", *Int);
+ assert(ret > 0 && ret < sizeof(scratch));
+ return cb(scratch, ret, app_key);
+ } else {
+ return cb("<absent>", 8, app_key);
+ }
+}
+
+void
+NativeInteger_free(asn1_TYPE_descriptor_t *td, void *ptr, int contents_only) {
+
+ if(!td || !ptr)
+ return;
+
+ ASN_DEBUG("Freeing %s as INTEGER (%d, %p, Native)",
+ td->name, contents_only, ptr);
+
+ if(!contents_only) {
+ FREEMEM(ptr);
+ }
+}
+