libs/smux/NativeEnumerated.c

   1 /*-
   2  * Copyright (c) 2004, 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
   3  * Redistribution and modifications are permitted subject to BSD license.
   4  */
   5 /*
   6  * Read the NativeInteger.h for the explanation wrt. differences between
   7  * INTEGER and NativeInteger.
   8  * Basically, both are decoders and encoders of ASN.1 INTEGER type, but this
   9  * implementation deals with the standard (machine-specific) representation
  10  * of them instead of using the platform-independent buffer.
  11  */
  12 #include <asn_internal.h>
  13 #include <NativeEnumerated.h>
  14
  15 /*
  16  * NativeEnumerated basic type description.
  17  */
  18 static const ber_tlv_tag_t asn_DEF_NativeEnumerated_tags[] = {
  19         (ASN_TAG_CLASS_UNIVERSAL | (10 << 2))
  20 };
  21 asn_TYPE_descriptor_t asn_DEF_NativeEnumerated = {
  22         "ENUMERATED",                   /* The ASN.1 type is still ENUMERATED */
  23         "ENUMERATED",
  24         NativeInteger_free,
  25         NativeInteger_print,
  26         asn_generic_no_constraint,
  27         NativeInteger_decode_ber,
  28         NativeInteger_encode_der,
  29         NativeInteger_decode_xer,
  30         NativeEnumerated_encode_xer,
  31         NativeEnumerated_decode_uper,
  32         NativeEnumerated_encode_uper,
  33         0, /* Use generic outmost tag fetcher */
  34         asn_DEF_NativeEnumerated_tags,
  35         sizeof(asn_DEF_NativeEnumerated_tags) / sizeof(asn_DEF_NativeEnumerated_tags[0]),
  36         asn_DEF_NativeEnumerated_tags,  /* Same as above */
  37         sizeof(asn_DEF_NativeEnumerated_tags) / sizeof(asn_DEF_NativeEnumerated_tags[0]),
  38         0,      /* No PER visible constraints */
  39         0, 0,   /* No members */
  40         0       /* No specifics */
  41 };
  42
  43 asn_enc_rval_t
  44 NativeEnumerated_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
  45         int ilevel, enum xer_encoder_flags_e flags,
  46                 asn_app_consume_bytes_f *cb, void *app_key) {
  47         asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
  48         asn_enc_rval_t er;
  49         const long *native = (const long *)sptr;
  50         const asn_INTEGER_enum_map_t *el;
  51
  52         (void)ilevel;
  53         (void)flags;
  54
  55         if(!native) ASN__ENCODE_FAILED;
  56
  57         el = INTEGER_map_value2enum(specs, *native);
  58         if(el) {
  59                 size_t srcsize = el->enum_len + 5;
  60                 char *src = (char *)alloca(srcsize);
  61
  62                 er.encoded = snprintf(src, srcsize, "<%s/>", el->enum_name);
  63                 assert(er.encoded > 0 && (size_t)er.encoded < srcsize);
  64                 if(cb(src, er.encoded, app_key) < 0) ASN__ENCODE_FAILED;
  65                 ASN__ENCODED_OK(er);
  66         } else {
  67                 ASN_DEBUG("ASN.1 forbids dealing with "
  68                         "unknown value of ENUMERATED type");
  69                 ASN__ENCODE_FAILED;
  70         }
  71 }
  72
  73 asn_dec_rval_t
  74 NativeEnumerated_decode_uper(asn_codec_ctx_t *opt_codec_ctx,
  75         asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints,
  76         void **sptr, asn_per_data_t *pd) {
  77         asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
  78         asn_dec_rval_t rval = { RC_OK, 0 };
  79         long *native = (long *)*sptr;
  80         asn_per_constraint_t *ct;
  81         long value;
  82
  83         (void)opt_codec_ctx;
  84
  85         if(constraints) ct = &constraints->value;
  86         else if(td->per_constraints) ct = &td->per_constraints->value;
  87         else ASN__DECODE_FAILED;        /* Mandatory! */
  88         if(!specs) ASN__DECODE_FAILED;
  89
  90         if(!native) {
  91                 native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
  92                 if(!native) ASN__DECODE_FAILED;
  93         }
  94
  95         ASN_DEBUG("Decoding %s as NativeEnumerated", td->name);
  96
  97         if(ct->flags & APC_EXTENSIBLE) {
  98                 int inext = per_get_few_bits(pd, 1);
  99                 if(inext < 0) ASN__DECODE_STARVED;
 100                 if(inext) ct = 0;
 101         }
 102
 103         if(ct && ct->range_bits >= 0) {
 104                 value = per_get_few_bits(pd, ct->range_bits);
 105                 if(value < 0) ASN__DECODE_STARVED;
 106                 if(value >= (specs->extension
 107                         ? specs->extension - 1 : specs->map_count))
 108                         ASN__DECODE_FAILED;
 109         } else {
 110                 if(!specs->extension)
 111                         ASN__DECODE_FAILED;
 112                 /*
 113                  * X.691, #10.6: normally small non-negative whole number;
 114                  */
 115                 value = uper_get_nsnnwn(pd);
 116                 if(value < 0) ASN__DECODE_STARVED;
 117                 value += specs->extension - 1;
 118                 if(value >= specs->map_count)
 119                         ASN__DECODE_FAILED;
 120         }
 121
 122         *native = specs->value2enum[value].nat_value;
 123         ASN_DEBUG("Decoded %s = %ld", td->name, *native);
 124
 125         return rval;
 126 }
 127
 128 static int
 129 NativeEnumerated__compar_value2enum(const void *ap, const void *bp) {
 130         const asn_INTEGER_enum_map_t *a = ap;
 131         const asn_INTEGER_enum_map_t *b = bp;
 132         if(a->nat_value == b->nat_value)
 133                 return 0;
 134         if(a->nat_value < b->nat_value)
 135                 return -1;
 136         return 1;
 137 }
 138
 139 asn_enc_rval_t
 140 NativeEnumerated_encode_uper(asn_TYPE_descriptor_t *td,
 141         asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
 142         asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
 143         asn_enc_rval_t er;
 144         long native, value;
 145         asn_per_constraint_t *ct;
 146         int inext = 0;
 147         asn_INTEGER_enum_map_t key;
 148         const asn_INTEGER_enum_map_t *kf;
 149
 150         if(!sptr) ASN__ENCODE_FAILED;
 151         if(!specs) ASN__ENCODE_FAILED;
 152
 153         if(constraints) ct = &constraints->value;
 154         else if(td->per_constraints) ct = &td->per_constraints->value;
 155         else ASN__ENCODE_FAILED;        /* Mandatory! */
 156
 157         ASN_DEBUG("Encoding %s as NativeEnumerated", td->name);
 158
 159         er.encoded = 0;
 160
 161         native = *(long *)sptr;
 162         if(native < 0) ASN__ENCODE_FAILED;
 163
 164         key.nat_value = native;
 165         kf = bsearch(&key, specs->value2enum, specs->map_count,
 166                 sizeof(key), NativeEnumerated__compar_value2enum);
 167         if(!kf) {
 168                 ASN_DEBUG("No element corresponds to %ld", native);
 169                 ASN__ENCODE_FAILED;
 170         }
 171         value = kf - specs->value2enum;
 172
 173         if(ct->range_bits >= 0) {
 174                 int cmpWith = specs->extension
 175                                 ? specs->extension - 1 : specs->map_count;
 176                 if(value >= cmpWith)
 177                         inext = 1;
 178         }
 179         if(ct->flags & APC_EXTENSIBLE) {
 180                 if(per_put_few_bits(po, inext, 1))
 181                         ASN__ENCODE_FAILED;
 182                 if(inext) ct = 0;
 183         } else if(inext) {
 184                 ASN__ENCODE_FAILED;
 185         }
 186
 187         if(ct && ct->range_bits >= 0) {
 188                 if(per_put_few_bits(po, value, ct->range_bits))
 189                         ASN__ENCODE_FAILED;
 190                 ASN__ENCODED_OK(er);
 191         }
 192
 193         if(!specs->extension)
 194                 ASN__ENCODE_FAILED;
 195
 196         /*
 197          * X.691, #10.6: normally small non-negative whole number;
 198          */
 199         ASN_DEBUG("value = %ld, ext = %d, inext = %d, res = %ld",
 200                 value, specs->extension, inext,
 201                 value - (inext ? (specs->extension - 1) : 0));
 202         if(uper_put_nsnnwn(po, value - (inext ? (specs->extension - 1) : 0)))
 203                 ASN__ENCODE_FAILED;
 204
 205         ASN__ENCODED_OK(er);
 206 }
 207