--- /dev/null
+/*-
+ * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_internal.h>
+#include <BIT_STRING.h>
+
+/*
+ * BIT STRING basic type description.
+ */
+static const ber_tlv_tag_t asn_DEF_BIT_STRING_tags[] = {
+ (ASN_TAG_CLASS_UNIVERSAL | (3 << 2))
+};
+asn_OCTET_STRING_specifics_t asn_SPC_BIT_STRING_specs = {
+ sizeof(BIT_STRING_t),
+ offsetof(BIT_STRING_t, _asn_ctx),
+ ASN_OSUBV_BIT
+};
+asn_TYPE_operation_t asn_OP_BIT_STRING = {
+ OCTET_STRING_free, /* Implemented in terms of OCTET STRING */
+#if !defined(ASN_DISABLE_PRINT_SUPPORT)
+ BIT_STRING_print,
+#else
+ 0,
+#endif /* !defined(ASN_DISABLE_PRINT_SUPPORT) */
+ BIT_STRING_compare,
+#if !defined(ASN_DISABLE_BER_SUPPORT)
+ OCTET_STRING_decode_ber, /* Implemented in terms of OCTET STRING */
+ OCTET_STRING_encode_der, /* Implemented in terms of OCTET STRING */
+#else
+ 0,
+ 0,
+#endif /* !defined(ASN_DISABLE_BER_SUPPORT) */
+#if !defined(ASN_DISABLE_XER_SUPPORT)
+ OCTET_STRING_decode_xer_binary,
+ BIT_STRING_encode_xer,
+#else
+ 0,
+ 0,
+#endif /* !defined(ASN_DISABLE_XER_SUPPORT) */
+#if !defined(ASN_DISABLE_JER_SUPPORT)
+ BIT_STRING_encode_jer,
+#else
+ 0,
+#endif /* !defined(ASN_DISABLE_JER_SUPPORT) */
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+ BIT_STRING_decode_oer,
+ BIT_STRING_encode_oer,
+#else
+ 0,
+ 0,
+#endif /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT)
+ BIT_STRING_decode_uper, /* Unaligned PER decoder */
+ BIT_STRING_encode_uper, /* Unaligned PER encoder */
+#else
+ 0,
+ 0,
+#endif /* !defined(ASN_DISABLE_UPER_SUPPORT) */
+#if !defined(ASN_DISABLE_APER_SUPPORT)
+ OCTET_STRING_decode_aper, /* Aligned PER decoder */
+ OCTET_STRING_encode_aper, /* Aligned PER encoder */
+#else
+ 0,
+ 0,
+#endif /* !defined(ASN_DISABLE_APER_SUPPORT) */
+#if !defined(ASN_DISABLE_RFILL_SUPPORT)
+ BIT_STRING_random_fill,
+#else
+ 0,
+#endif /* !defined(ASN_DISABLE_RFILL_SUPPORT) */
+ 0 /* Use generic outmost tag fetcher */
+};
+asn_TYPE_descriptor_t asn_DEF_BIT_STRING = {
+ "BIT STRING",
+ "BIT_STRING",
+ &asn_OP_BIT_STRING,
+ asn_DEF_BIT_STRING_tags,
+ sizeof(asn_DEF_BIT_STRING_tags)
+ / sizeof(asn_DEF_BIT_STRING_tags[0]),
+ asn_DEF_BIT_STRING_tags, /* Same as above */
+ sizeof(asn_DEF_BIT_STRING_tags)
+ / sizeof(asn_DEF_BIT_STRING_tags[0]),
+ {
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+ 0,
+#endif /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+ 0,
+#endif /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+ BIT_STRING_constraint
+ },
+ 0, 0, /* No members */
+ &asn_SPC_BIT_STRING_specs
+};
+
+/*
+ * BIT STRING generic constraint.
+ */
+int
+BIT_STRING_constraint(const asn_TYPE_descriptor_t *td, const void *sptr,
+ asn_app_constraint_failed_f *ctfailcb, void *app_key) {
+ const BIT_STRING_t *st = (const BIT_STRING_t *)sptr;
+
+ if(st && st->buf) {
+ if((st->size == 0 && st->bits_unused)
+ || st->bits_unused < 0 || st->bits_unused > 7) {
+ ASN__CTFAIL(app_key, td, sptr,
+ "%s: invalid padding byte (%s:%d)",
+ td->name, __FILE__, __LINE__);
+ return -1;
+ }
+ } else {
+ ASN__CTFAIL(app_key, td, sptr,
+ "%s: value not given (%s:%d)",
+ td->name, __FILE__, __LINE__);
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Non-destructively remove the trailing 0-bits from the given bit string.
+ */
+const BIT_STRING_t *
+BIT_STRING__compactify(const BIT_STRING_t *st, BIT_STRING_t *tmp) {
+ const uint8_t *b;
+ union {
+ const uint8_t *c_buf;
+ uint8_t *nc_buf;
+ } unconst;
+
+ if(st->size == 0) {
+ assert(st->bits_unused == 0);
+ return st;
+ } else {
+ for(b = &st->buf[st->size - 1]; b > st->buf && *b == 0; b--) {
+ ;
+ }
+ /* b points to the last byte which may contain data */
+ if(*b) {
+ int unused = 7;
+ uint8_t v = *b;
+ v &= -(int8_t)v;
+ if(v & 0x0F) unused -= 4;
+ if(v & 0x33) unused -= 2;
+ if(v & 0x55) unused -= 1;
+ tmp->size = b-st->buf + 1;
+ tmp->bits_unused = unused;
+ } else {
+ tmp->size = b-st->buf;
+ tmp->bits_unused = 0;
+ }
+
+ assert(b >= st->buf);
+ }
+
+ unconst.c_buf = st->buf;
+ tmp->buf = unconst.nc_buf;
+ return tmp;
+}
+
+/*
+ * Lexicographically compare the common prefix of both strings,
+ * and if it is the same return -1 for the smallest string.
+ */
+int
+BIT_STRING_compare(const asn_TYPE_descriptor_t *td, const void *aptr,
+ const void *bptr) {
+ /*
+ * Remove information about trailing bits, since
+ * X.680 (08/2015) #22.7 "ensure that different semantics are not"
+ * "associated with [values that differ only in] the trailing 0 bits."
+ */
+ BIT_STRING_t compact_a, compact_b;
+ const BIT_STRING_t *a = BIT_STRING__compactify(aptr, &compact_a);
+ const BIT_STRING_t *b = BIT_STRING__compactify(bptr, &compact_b);
+ const asn_OCTET_STRING_specifics_t *specs = td->specifics;
+
+ (void)specs;
+ assert(specs && specs->subvariant == ASN_OSUBV_BIT);
+
+ if(a && b) {
+ size_t common_prefix_size = a->size <= b->size ? a->size : b->size;
+ int ret = memcmp(a->buf, b->buf, common_prefix_size);
+ if(ret == 0) {
+ /* Figure out which string with equal prefixes is longer. */
+ if(a->size < b->size) {
+ return -1;
+ } else if(a->size > b->size) {
+ return 1;
+ } else {
+ /* Figure out how many unused bits */
+ if(a->bits_unused > b->bits_unused) {
+ return -1;
+ } else if(a->bits_unused < b->bits_unused) {
+ return 1;
+ } else {
+ return 0;
+ }
+ }
+ } else {
+ return ret;
+ }
+ } else if(!a && !b) {
+ return 0;
+ } else if(!a) {
+ return -1;
+ } else {
+ return 1;
+ }
+}
Code Review / sim / e2-interface.git / blobdiff