--- /dev/null
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_internal.h>
+#include <NativeInteger.h>
+#include <INTEGER.h>
+
+/*
+ * Decode INTEGER type.
+ */
+asn_dec_rval_t
+NativeInteger_decode_ber(const asn_codec_ctx_t *opt_codec_ctx,
+ const asn_TYPE_descriptor_t *td, void **nint_ptr,
+ const void *buf_ptr, size_t size, int tag_mode) {
+ const asn_INTEGER_specifics_t *specs =
+ (const asn_INTEGER_specifics_t *)td->specifics;
+ long *native = (long *)*nint_ptr;
+ asn_dec_rval_t rval;
+ ber_tlv_len_t length;
+
+ /*
+ * If the structure is not there, allocate it.
+ */
+ if(native == NULL) {
+ native = (long *)(*nint_ptr = CALLOC(1, sizeof(*native)));
+ if(native == 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(opt_codec_ctx, td, 0, buf_ptr, size,
+ tag_mode, 0, &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 = ((const char *)buf_ptr) + rval.consumed;
+ size -= rval.consumed;
+ if(length > (ber_tlv_len_t)size) {
+ rval.code = RC_WMORE;
+ rval.consumed = 0;
+ return rval;
+ }
+
+ /*
+ * ASN.1 encoded INTEGER: buf_ptr, length
+ * Fill the native, at the same time checking for overflow.
+ * If overflow occurred, return with RC_FAIL.
+ */
+ {
+ INTEGER_t tmp;
+ union {
+ const void *constbuf;
+ void *nonconstbuf;
+ } unconst_buf;
+ long l;
+
+ unconst_buf.constbuf = buf_ptr;
+ tmp.buf = (uint8_t *)unconst_buf.nonconstbuf;
+ tmp.size = length;
+
+ if((specs&&specs->field_unsigned)
+ ? asn_INTEGER2ulong(&tmp, (unsigned long *)&l) /* sic */
+ : asn_INTEGER2long(&tmp, &l)) {
+ rval.code = RC_FAIL;
+ rval.consumed = 0;
+ return rval;
+ }
+
+ *native = l;
+ }
+
+ rval.code = RC_OK;
+ rval.consumed += length;
+
+ ASN_DEBUG("Took %ld/%ld bytes to encode %s (%ld)",
+ (long)rval.consumed, (long)length, td->name, (long)*native);
+
+ return rval;
+}
+
+/*
+ * Encode the NativeInteger using the standard INTEGER type DER encoder.
+ */
+asn_enc_rval_t
+NativeInteger_encode_der(const asn_TYPE_descriptor_t *sd, const void *ptr,
+ int tag_mode, ber_tlv_tag_t tag,
+ asn_app_consume_bytes_f *cb, void *app_key) {
+ unsigned long native = *(const unsigned long *)ptr; /* Disable sign ext. */
+ asn_enc_rval_t erval = {0,0,0};
+ INTEGER_t tmp;
+
+#ifdef WORDS_BIGENDIAN /* Opportunistic optimization */
+
+ tmp.buf = (uint8_t *)&native;
+ tmp.size = sizeof(native);
+
+#else /* Works even if WORDS_BIGENDIAN is not set where should've been */
+ uint8_t buf[sizeof(native)];
+ uint8_t *p;
+
+ /* Prepare a fake INTEGER */
+ for(p = buf + sizeof(buf) - 1; p >= buf; p--, native >>= 8)
+ *p = (uint8_t)native;
+
+ 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.structure_ptr == &tmp) {
+ erval.structure_ptr = ptr;
+ }
+ return erval;
+}