Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved. |
| 3 | * Redistribution and modifications are permitted subject to BSD license. |
| 4 | */ |
| 5 | #include <asn_internal.h> |
| 6 | #include <asn_application.h> |
| 7 | #include <errno.h> |
| 8 | |
| 9 | static asn_enc_rval_t asn_encode_internal( |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 10 | const asn_codec_ctx_t *opt_codec_ctx, |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 11 | enum asn_transfer_syntax syntax, asn_TYPE_descriptor_t *td, |
| 12 | void *sptr, asn_app_consume_bytes_f *callback, void *callback_key); |
| 13 | |
| 14 | |
| 15 | struct callback_count_bytes_key { |
| 16 | asn_app_consume_bytes_f *callback; |
| 17 | void *callback_key; |
| 18 | size_t computed_size; |
| 19 | }; |
| 20 | |
| 21 | /* |
| 22 | * Encoder which just counts bytes that come through it. |
| 23 | */ |
| 24 | static int |
| 25 | callback_count_bytes_cb(const void *data, size_t size, void *keyp) { |
| 26 | struct callback_count_bytes_key *key = keyp; |
| 27 | int ret; |
| 28 | |
| 29 | ret = key->callback(data, size, key->callback_key); |
| 30 | if(ret >= 0) { |
| 31 | key->computed_size += size; |
| 32 | } |
| 33 | |
| 34 | return ret; |
| 35 | } |
| 36 | |
| 37 | struct overrun_encoder_key { |
| 38 | void *buffer; |
| 39 | size_t buffer_size; |
| 40 | size_t computed_size; |
| 41 | }; |
| 42 | |
| 43 | struct callback_failure_catch_key { |
| 44 | asn_app_consume_bytes_f *callback; |
| 45 | void *callback_key; |
| 46 | int callback_failed; |
| 47 | }; |
| 48 | |
| 49 | /* |
| 50 | * Encoder which doesn't stop counting bytes |
| 51 | * even if it reaches the end of the buffer. |
| 52 | */ |
| 53 | static int |
| 54 | overrun_encoder_cb(const void *data, size_t size, void *keyp) { |
| 55 | struct overrun_encoder_key *key = keyp; |
| 56 | |
| 57 | if(key->computed_size + size > key->buffer_size) { |
| 58 | /* |
| 59 | * Avoid accident on the next call: |
| 60 | * stop adding bytes to the buffer. |
| 61 | */ |
| 62 | key->buffer_size = 0; |
| 63 | } else { |
| 64 | memcpy((char *)key->buffer + key->computed_size, data, size); |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 65 | } |
Lev Walkin | a5b0288 | 2017-10-01 22:48:44 -0700 | [diff] [blame] | 66 | key->computed_size += size; |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Encoder which help convert the application level encoder failure into EIO. |
| 73 | */ |
| 74 | static int |
| 75 | callback_failure_catch_cb(const void *data, size_t size, void *keyp) { |
| 76 | struct callback_failure_catch_key *key = keyp; |
| 77 | int ret; |
| 78 | |
| 79 | ret = key->callback(data, size, key->callback_key); |
| 80 | if(ret < 0) { |
| 81 | key->callback_failed = 1; |
| 82 | } |
| 83 | |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | asn_enc_rval_t |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 88 | asn_encode(const asn_codec_ctx_t *opt_codec_ctx, |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 89 | enum asn_transfer_syntax syntax, asn_TYPE_descriptor_t *td, |
| 90 | void *sptr, asn_app_consume_bytes_f *callback, void *callback_key) { |
| 91 | struct callback_failure_catch_key cb_key; |
| 92 | asn_enc_rval_t er; |
| 93 | |
| 94 | if(!callback) { |
| 95 | errno = EINVAL; |
| 96 | ASN__ENCODE_FAILED; |
| 97 | } |
| 98 | |
| 99 | cb_key.callback = callback; |
| 100 | cb_key.callback_key = callback_key; |
| 101 | cb_key.callback_failed = 0; |
| 102 | |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 103 | er = asn_encode_internal(opt_codec_ctx, syntax, td, sptr, |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 104 | callback_failure_catch_cb, &cb_key); |
| 105 | if(cb_key.callback_failed) { |
| 106 | assert(er.encoded == -1); |
| 107 | assert(errno == EBADF); |
| 108 | errno = EIO; |
| 109 | } |
| 110 | |
| 111 | return er; |
| 112 | } |
| 113 | |
| 114 | asn_enc_rval_t |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 115 | asn_encode_to_buffer(const asn_codec_ctx_t *opt_codec_ctx, |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 116 | enum asn_transfer_syntax syntax, asn_TYPE_descriptor_t *td, |
| 117 | void *sptr, void *buffer, size_t buffer_size) { |
| 118 | struct overrun_encoder_key buf_key; |
| 119 | asn_enc_rval_t er; |
| 120 | |
| 121 | if(buffer_size > 0 && !buffer) { |
| 122 | errno = EINVAL; |
| 123 | ASN__ENCODE_FAILED; |
| 124 | } |
| 125 | |
| 126 | buf_key.buffer = buffer; |
| 127 | buf_key.buffer_size = buffer_size; |
| 128 | buf_key.computed_size = 0; |
| 129 | |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 130 | er = asn_encode_internal(opt_codec_ctx, syntax, td, sptr, |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 131 | overrun_encoder_cb, &buf_key); |
| 132 | |
Lev Walkin | a5b0288 | 2017-10-01 22:48:44 -0700 | [diff] [blame] | 133 | if(er.encoded >= 0 && (size_t)er.encoded != buf_key.computed_size) { |
Lev Walkin | aa5838c | 2017-10-03 17:13:33 -0700 | [diff] [blame] | 134 | ASN_DEBUG("asn_encode() returned %zd yet produced %zu bytes", |
Lev Walkin | a5b0288 | 2017-10-01 22:48:44 -0700 | [diff] [blame] | 135 | er.encoded, buf_key.computed_size); |
Lev Walkin | aa5838c | 2017-10-03 17:13:33 -0700 | [diff] [blame] | 136 | assert(er.encoded < 0 || (size_t)er.encoded == buf_key.computed_size); |
Lev Walkin | a5b0288 | 2017-10-01 22:48:44 -0700 | [diff] [blame] | 137 | } |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 138 | |
| 139 | return er; |
| 140 | } |
| 141 | |
| 142 | static asn_enc_rval_t |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 143 | asn_encode_internal(const asn_codec_ctx_t *opt_codec_ctx, |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 144 | enum asn_transfer_syntax syntax, asn_TYPE_descriptor_t *td, |
| 145 | void *sptr, asn_app_consume_bytes_f *callback, |
| 146 | void *callback_key) { |
| 147 | asn_enc_rval_t er; |
| 148 | enum xer_encoder_flags_e xer_flags = XER_F_CANONICAL; |
| 149 | |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 150 | (void)opt_codec_ctx; /* Parameters are not checked on encode yet. */ |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 151 | |
| 152 | if(!td || !sptr) { |
| 153 | errno = EINVAL; |
| 154 | ASN__ENCODE_FAILED; |
| 155 | } |
| 156 | |
| 157 | switch(syntax) { |
Lev Walkin | a5972be | 2017-09-29 23:15:58 -0700 | [diff] [blame] | 158 | case ATS_NONSTANDARD_PLAINTEXT: |
| 159 | if(td->op->print_struct) { |
| 160 | struct callback_count_bytes_key cb_key; |
| 161 | cb_key.callback = callback; |
| 162 | cb_key.callback_key = callback_key; |
| 163 | cb_key.computed_size = 0; |
| 164 | if(td->op->print_struct(td, sptr, 1, callback_count_bytes_cb, |
| 165 | &cb_key) |
| 166 | < 0 |
| 167 | || callback_count_bytes_cb("\n", 1, &cb_key) < 0) { |
| 168 | errno = EBADF; /* Structure has incorrect form. */ |
| 169 | er.encoded = -1; |
| 170 | er.failed_type = td; |
| 171 | er.structure_ptr = sptr; |
| 172 | } else { |
| 173 | er.encoded = cb_key.computed_size; |
| 174 | er.failed_type = 0; |
| 175 | er.structure_ptr = 0; |
| 176 | } |
| 177 | } else { |
| 178 | errno = ENOENT; /* Transfer syntax is not defined for this type. */ |
| 179 | ASN__ENCODE_FAILED; |
| 180 | } |
| 181 | break; |
| 182 | |
| 183 | case ATS_RANDOM: |
| 184 | errno = ENOENT; /* Randomization doesn't make sense on output. */ |
| 185 | ASN__ENCODE_FAILED; |
| 186 | |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 187 | case ATS_BER: |
| 188 | /* BER is a superset of DER. */ |
| 189 | /* Fall through. */ |
| 190 | case ATS_DER: |
| 191 | if(td->op->der_encoder) { |
| 192 | er = der_encode(td, sptr, callback, callback_key); |
| 193 | if(er.encoded == -1) { |
| 194 | if(er.failed_type && er.failed_type->op->der_encoder) { |
| 195 | errno = EBADF; /* Structure has incorrect form. */ |
| 196 | } else { |
| 197 | errno = ENOENT; /* DER is not defined for this type. */ |
| 198 | } |
| 199 | } |
| 200 | } else { |
| 201 | errno = ENOENT; /* Transfer syntax is not defined for this type. */ |
| 202 | ASN__ENCODE_FAILED; |
| 203 | } |
| 204 | break; |
| 205 | case ATS_CER: |
| 206 | errno = ENOENT; /* Transfer syntax is not defined for any type. */ |
| 207 | ASN__ENCODE_FAILED; |
| 208 | |
| 209 | #ifdef ASN_DISABLE_OER_SUPPORT |
| 210 | case ATS_BASIC_OER: |
| 211 | case ATS_CANONICAL_OER: |
| 212 | errno = ENOENT; /* PER is not defined. */ |
| 213 | ASN__ENCODE_FAILED; |
| 214 | break; |
| 215 | #else /* ASN_DISABLE_OER_SUPPORT */ |
| 216 | case ATS_BASIC_OER: |
| 217 | /* CANONICAL-OER is a superset of BASIC-OER. */ |
| 218 | /* Fall through. */ |
| 219 | case ATS_CANONICAL_OER: |
| 220 | if(td->op->oer_encoder) { |
| 221 | er = oer_encode(td, sptr, callback, callback_key); |
| 222 | if(er.encoded == -1) { |
| 223 | if(er.failed_type && er.failed_type->op->oer_encoder) { |
| 224 | errno = EBADF; /* Structure has incorrect form. */ |
| 225 | } else { |
| 226 | errno = ENOENT; /* OER is not defined for this type. */ |
| 227 | } |
| 228 | } |
| 229 | } else { |
| 230 | errno = ENOENT; /* Transfer syntax is not defined for this type. */ |
| 231 | ASN__ENCODE_FAILED; |
| 232 | } |
| 233 | break; |
| 234 | #endif /* ASN_DISABLE_OER_SUPPORT */ |
| 235 | |
| 236 | #ifdef ASN_DISABLE_PER_SUPPORT |
| 237 | case ATS_UNALIGNED_BASIC_PER: |
| 238 | case ATS_UNALIGNED_CANONICAL_PER: |
| 239 | errno = ENOENT; /* PER is not defined. */ |
| 240 | ASN__ENCODE_FAILED; |
| 241 | break; |
| 242 | #else /* ASN_DISABLE_PER_SUPPORT */ |
| 243 | case ATS_UNALIGNED_BASIC_PER: |
| 244 | /* CANONICAL-UPER is a superset of BASIC-UPER. */ |
| 245 | /* Fall through. */ |
| 246 | case ATS_UNALIGNED_CANONICAL_PER: |
| 247 | if(td->op->uper_encoder) { |
| 248 | er = uper_encode(td, sptr, callback, callback_key); |
| 249 | if(er.encoded == -1) { |
| 250 | if(er.failed_type && er.failed_type->op->uper_encoder) { |
| 251 | errno = EBADF; /* Structure has incorrect form. */ |
| 252 | } else { |
| 253 | errno = ENOENT; /* UPER is not defined for this type. */ |
| 254 | } |
| 255 | } else { |
| 256 | ASN_DEBUG("Complete encoded in %ld bits", (long)er.encoded); |
| 257 | if(er.encoded == 0) { |
| 258 | /* Enforce "Complete Encoding" of X.691 #11.1 */ |
| 259 | if(callback("\0", 1, callback_key) < 0) { |
| 260 | errno = EBADF; |
| 261 | ASN__ENCODE_FAILED; |
| 262 | } |
| 263 | er.encoded = 8; /* Exactly 8 zero bits is added. */ |
| 264 | } |
| 265 | /* Convert bits into bytes */ |
| 266 | er.encoded = (er.encoded + 7) >> 3; |
| 267 | } |
| 268 | } else { |
| 269 | errno = ENOENT; /* Transfer syntax is not defined for this type. */ |
| 270 | ASN__ENCODE_FAILED; |
| 271 | } |
| 272 | break; |
| 273 | #endif /* ASN_DISABLE_PER_SUPPORT */ |
| 274 | |
| 275 | case ATS_BASIC_XER: |
| 276 | /* CANONICAL-XER is a superset of BASIC-XER. */ |
| 277 | xer_flags &= ~XER_F_CANONICAL; |
| 278 | xer_flags |= XER_F_BASIC; |
| 279 | /* Fall through. */ |
| 280 | case ATS_CANONICAL_XER: |
| 281 | if(td->op->xer_encoder) { |
| 282 | er = xer_encode(td, sptr, xer_flags, callback, callback_key); |
| 283 | if(er.encoded == -1) { |
| 284 | if(er.failed_type && er.failed_type->op->xer_encoder) { |
| 285 | errno = EBADF; /* Structure has incorrect form. */ |
| 286 | } else { |
| 287 | errno = ENOENT; /* XER is not defined for this type. */ |
| 288 | } |
| 289 | } |
| 290 | } else { |
| 291 | errno = ENOENT; /* Transfer syntax is not defined for this type. */ |
| 292 | ASN__ENCODE_FAILED; |
| 293 | } |
| 294 | break; |
| 295 | |
Lev Walkin | 6d46bc3 | 2017-09-12 21:34:00 -0700 | [diff] [blame] | 296 | default: |
| 297 | errno = ENOENT; |
| 298 | ASN__ENCODE_FAILED; |
| 299 | } |
| 300 | |
| 301 | return er; |
| 302 | } |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 303 | |
| 304 | asn_dec_rval_t |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 305 | asn_decode(const asn_codec_ctx_t *opt_codec_ctx, |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 306 | enum asn_transfer_syntax syntax, struct asn_TYPE_descriptor_s *td, |
| 307 | void **sptr, const void *buffer, size_t size) { |
| 308 | |
Lev Walkin | a5972be | 2017-09-29 23:15:58 -0700 | [diff] [blame] | 309 | if(!td || !td->op || !sptr || (size && !buffer)) { |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 310 | ASN__DECODE_FAILED; |
| 311 | } |
| 312 | |
| 313 | switch(syntax) { |
| 314 | case ATS_CER: |
| 315 | case ATS_NONSTANDARD_PLAINTEXT: |
| 316 | default: |
| 317 | errno = ENOENT; |
| 318 | ASN__DECODE_FAILED; |
| 319 | |
Lev Walkin | a5972be | 2017-09-29 23:15:58 -0700 | [diff] [blame] | 320 | case ATS_RANDOM: |
| 321 | if(!td->op->random_fill) { |
| 322 | ASN__DECODE_FAILED; |
| 323 | } else { |
| 324 | if(asn_random_fill(td, sptr, 16000) == 0) { |
| 325 | asn_dec_rval_t ret = {RC_OK, 0}; |
| 326 | return ret; |
| 327 | } else { |
| 328 | ASN__DECODE_FAILED; |
| 329 | } |
| 330 | } |
| 331 | break; |
| 332 | |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 333 | case ATS_DER: |
| 334 | case ATS_BER: |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 335 | return ber_decode(opt_codec_ctx, td, sptr, buffer, size); |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 336 | |
| 337 | case ATS_BASIC_OER: |
| 338 | case ATS_CANONICAL_OER: |
| 339 | #ifdef ASN_DISABLE_OER_SUPPORT |
| 340 | errno = ENOENT; |
| 341 | ASN__DECODE_FAILED; |
| 342 | #else |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 343 | return oer_decode(opt_codec_ctx, td, sptr, buffer, size); |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 344 | #endif |
| 345 | |
| 346 | case ATS_UNALIGNED_BASIC_PER: |
| 347 | case ATS_UNALIGNED_CANONICAL_PER: |
| 348 | #ifdef ASN_DISABLE_PER_SUPPORT |
| 349 | errno = ENOENT; |
| 350 | ASN__DECODE_FAILED; |
| 351 | #else |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 352 | return uper_decode_complete(opt_codec_ctx, td, sptr, buffer, size); |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 353 | #endif |
| 354 | |
| 355 | case ATS_BASIC_XER: |
| 356 | case ATS_CANONICAL_XER: |
Lev Walkin | afbf2a9 | 2017-09-12 23:30:27 -0700 | [diff] [blame] | 357 | return xer_decode(opt_codec_ctx, td, sptr, buffer, size); |
Lev Walkin | e8bbe93 | 2017-09-12 23:06:52 -0700 | [diff] [blame] | 358 | } |
| 359 | } |
| 360 | |