--- /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 <OCTET_STRING.h>
+#include <BIT_STRING.h> /* for .bits_unused member */
+
+#undef RETURN
+#define RETURN(_code) do {\
+ asn_dec_rval_t tmprval;\
+ tmprval.code = _code;\
+ tmprval.consumed = consumed_myself;\
+ return tmprval;\
+ } while(0)
+
+static asn_per_constraints_t asn_DEF_OCTET_STRING_constraints = {
+ { APC_CONSTRAINED, 8, 8, 0, 255 },
+ { APC_SEMI_CONSTRAINED, -1, -1, 0, 0 },
+ 0, 0
+};
+
+asn_dec_rval_t
+OCTET_STRING_decode_uper(const asn_codec_ctx_t *opt_codec_ctx,
+ const asn_TYPE_descriptor_t *td,
+ const asn_per_constraints_t *constraints, void **sptr,
+ asn_per_data_t *pd) {
+ const asn_OCTET_STRING_specifics_t *specs = td->specifics
+ ? (const asn_OCTET_STRING_specifics_t *)td->specifics
+ : &asn_SPC_OCTET_STRING_specs;
+ const asn_per_constraints_t *pc =
+ constraints ? constraints : td->encoding_constraints.per_constraints;
+ const asn_per_constraint_t *cval;
+ const asn_per_constraint_t *csiz;
+ asn_dec_rval_t rval = { RC_OK, 0 };
+ OCTET_STRING_t *st = (OCTET_STRING_t *)*sptr;
+ ssize_t consumed_myself = 0;
+ int repeat;
+ enum {
+ OS__BPC_CHAR = 1,
+ OS__BPC_U16 = 2,
+ OS__BPC_U32 = 4
+ } bpc; /* Bytes per character */
+ unsigned int unit_bits;
+ unsigned int canonical_unit_bits;
+
+ (void)opt_codec_ctx;
+
+ if(pc) {
+ cval = &pc->value;
+ csiz = &pc->size;
+ } else {
+ cval = &asn_DEF_OCTET_STRING_constraints.value;
+ csiz = &asn_DEF_OCTET_STRING_constraints.size;
+ }
+
+ switch(specs->subvariant) {
+ default:
+ case ASN_OSUBV_ANY:
+ case ASN_OSUBV_BIT:
+ ASN_DEBUG("Unrecognized subvariant %d", specs->subvariant);
+ RETURN(RC_FAIL);
+ break;
+ case ASN_OSUBV_STR:
+ canonical_unit_bits = unit_bits = 8;
+ if(cval->flags & APC_CONSTRAINED)
+ unit_bits = cval->range_bits;
+ bpc = OS__BPC_CHAR;
+ break;
+ case ASN_OSUBV_U16:
+ canonical_unit_bits = unit_bits = 16;
+ if(cval->flags & APC_CONSTRAINED)
+ unit_bits = cval->range_bits;
+ bpc = OS__BPC_U16;
+ break;
+ case ASN_OSUBV_U32:
+ canonical_unit_bits = unit_bits = 32;
+ if(cval->flags & APC_CONSTRAINED)
+ unit_bits = cval->range_bits;
+ bpc = OS__BPC_U32;
+ break;
+ }
+
+ /*
+ * Allocate the string.
+ */
+ if(!st) {
+ st = (OCTET_STRING_t *)(*sptr = CALLOC(1, specs->struct_size));
+ if(!st) RETURN(RC_FAIL);
+ }
+
+ ASN_DEBUG("PER Decoding %s size %ld .. %ld bits %d",
+ csiz->flags & APC_EXTENSIBLE ? "extensible" : "non-extensible",
+ csiz->lower_bound, csiz->upper_bound, csiz->effective_bits);
+
+ if(csiz->flags & APC_EXTENSIBLE) {
+ int inext = per_get_few_bits(pd, 1);
+ if(inext < 0) RETURN(RC_WMORE);
+ if(inext) {
+ csiz = &asn_DEF_OCTET_STRING_constraints.size;
+ unit_bits = canonical_unit_bits;
+ }
+ }
+
+ if(csiz->effective_bits >= 0) {
+ FREEMEM(st->buf);
+ if(bpc) {
+ st->size = csiz->upper_bound * bpc;
+ } else {
+ st->size = (csiz->upper_bound + 7) >> 3;
+ }
+ st->buf = (uint8_t *)MALLOC(st->size + 1);
+ if(!st->buf) { st->size = 0; RETURN(RC_FAIL); }
+ }
+
+ /* X.691, #16.5: zero-length encoding */
+ /* X.691, #16.6: short fixed length encoding (up to 2 octets) */
+ /* X.691, #16.7: long fixed length encoding (up to 64K octets) */
+ if(csiz->effective_bits == 0) {
+ int ret;
+ if(bpc) {
+ ASN_DEBUG("Encoding OCTET STRING size %ld",
+ csiz->upper_bound);
+ ret = OCTET_STRING_per_get_characters(pd, st->buf,
+ csiz->upper_bound,
+ bpc, unit_bits,
+ cval->lower_bound,
+ cval->upper_bound,
+ pc);
+ if(ret > 0) RETURN(RC_FAIL);
+ } else {
+ ASN_DEBUG("Encoding BIT STRING size %ld",
+ csiz->upper_bound);
+ ret = per_get_many_bits(pd, st->buf, 0,
+ unit_bits * csiz->upper_bound);
+ }
+ if(ret < 0) RETURN(RC_WMORE);
+ consumed_myself += unit_bits * csiz->upper_bound;
+ st->buf[st->size] = 0;
+ RETURN(RC_OK);
+ }
+
+ st->size = 0;
+ do {
+ ssize_t raw_len;
+ ssize_t len_bytes;
+ void *p;
+ int ret;
+
+ /* Get the PER length */
+ raw_len = uper_get_length(pd, csiz->effective_bits, csiz->lower_bound,
+ &repeat);
+ if(raw_len < 0) RETURN(RC_WMORE);
+ if(raw_len == 0 && st->buf) break;
+
+ ASN_DEBUG("Got PER length eb %ld, len %ld, %s (%s)",
+ (long)csiz->effective_bits, (long)raw_len,
+ repeat ? "repeat" : "once", td->name);
+ len_bytes = raw_len * bpc;
+ p = REALLOC(st->buf, st->size + len_bytes + 1);
+ if(!p) RETURN(RC_FAIL);
+ st->buf = (uint8_t *)p;
+
+ ret = OCTET_STRING_per_get_characters(pd, &st->buf[st->size], raw_len,
+ bpc, unit_bits, cval->lower_bound,
+ cval->upper_bound, pc);
+ if(ret > 0) RETURN(RC_FAIL);
+ if(ret < 0) RETURN(RC_WMORE);
+ st->size += len_bytes;
+ } while(repeat);
+ st->buf[st->size] = 0; /* nul-terminate */
+
+ return rval;
+}
+
+asn_enc_rval_t
+OCTET_STRING_encode_uper(const asn_TYPE_descriptor_t *td,
+ const asn_per_constraints_t *constraints,
+ const void *sptr, asn_per_outp_t *po) {
+ const asn_OCTET_STRING_specifics_t *specs = td->specifics
+ ? (const asn_OCTET_STRING_specifics_t *)td->specifics
+ : &asn_SPC_OCTET_STRING_specs;
+ const asn_per_constraints_t *pc = constraints
+ ? constraints
+ : td->encoding_constraints.per_constraints;
+ const asn_per_constraint_t *cval;
+ const asn_per_constraint_t *csiz;
+ const OCTET_STRING_t *st = (const OCTET_STRING_t *)sptr;
+ asn_enc_rval_t er = { 0, 0, 0 };
+ int inext = 0; /* Lies not within extension root */
+ unsigned int unit_bits;
+ unsigned int canonical_unit_bits;
+ size_t size_in_units;
+ const uint8_t *buf;
+ int ret;
+ enum {
+ OS__BPC_CHAR = 1,
+ OS__BPC_U16 = 2,
+ OS__BPC_U32 = 4
+ } bpc; /* Bytes per character */
+ int ct_extensible;
+
+ if(!st || (!st->buf && st->size))
+ ASN__ENCODE_FAILED;
+
+ if(pc) {
+ cval = &pc->value;
+ csiz = &pc->size;
+ } else {
+ cval = &asn_DEF_OCTET_STRING_constraints.value;
+ csiz = &asn_DEF_OCTET_STRING_constraints.size;
+ }
+ ct_extensible = csiz->flags & APC_EXTENSIBLE;
+
+ switch(specs->subvariant) {
+ default:
+ case ASN_OSUBV_ANY:
+ case ASN_OSUBV_BIT:
+ ASN__ENCODE_FAILED;
+ case ASN_OSUBV_STR:
+ canonical_unit_bits = unit_bits = 8;
+ if(cval->flags & APC_CONSTRAINED)
+ unit_bits = cval->range_bits;
+ bpc = OS__BPC_CHAR;
+ size_in_units = st->size;
+ break;
+ case ASN_OSUBV_U16:
+ canonical_unit_bits = unit_bits = 16;
+ if(cval->flags & APC_CONSTRAINED)
+ unit_bits = cval->range_bits;
+ bpc = OS__BPC_U16;
+ size_in_units = st->size >> 1;
+ if(st->size & 1) {
+ ASN_DEBUG("%s string size is not modulo 2", td->name);
+ ASN__ENCODE_FAILED;
+ }
+ break;
+ case ASN_OSUBV_U32:
+ canonical_unit_bits = unit_bits = 32;
+ if(cval->flags & APC_CONSTRAINED)
+ unit_bits = cval->range_bits;
+ bpc = OS__BPC_U32;
+ size_in_units = st->size >> 2;
+ if(st->size & 3) {
+ ASN_DEBUG("%s string size is not modulo 4", td->name);
+ ASN__ENCODE_FAILED;
+ }
+ break;
+ }
+
+ ASN_DEBUG("Encoding %s into %" ASN_PRI_SIZE " units of %d bits"
+ " (%ld..%ld, effective %d)%s",
+ td->name, size_in_units, unit_bits,
+ csiz->lower_bound, csiz->upper_bound,
+ csiz->effective_bits, ct_extensible ? " EXT" : "");
+
+ /* Figure out whether size lies within PER visible constraint */
+
+ if(csiz->effective_bits >= 0) {
+ if((ssize_t)size_in_units < csiz->lower_bound
+ || (ssize_t)size_in_units > csiz->upper_bound) {
+ if(ct_extensible) {
+ csiz = &asn_DEF_OCTET_STRING_constraints.size;
+ unit_bits = canonical_unit_bits;
+ inext = 1;
+ } else {
+ ASN__ENCODE_FAILED;
+ }
+ }
+ } else {
+ inext = 0;
+ }
+
+ if(ct_extensible) {
+ /* Declare whether length is [not] within extension root */
+ if(per_put_few_bits(po, inext, 1))
+ ASN__ENCODE_FAILED;
+ }
+
+ if(csiz->effective_bits >= 0 && !inext) {
+ ASN_DEBUG("Encoding %" ASN_PRI_SIZE " bytes (%ld), length in %d bits", st->size,
+ size_in_units - csiz->lower_bound, csiz->effective_bits);
+ ret = per_put_few_bits(po, size_in_units - csiz->lower_bound,
+ csiz->effective_bits);
+ if(ret) ASN__ENCODE_FAILED;
+ ret = OCTET_STRING_per_put_characters(po, st->buf, size_in_units, bpc,
+ unit_bits, cval->lower_bound,
+ cval->upper_bound, pc);
+ if(ret) ASN__ENCODE_FAILED;
+ ASN__ENCODED_OK(er);
+ }
+
+ ASN_DEBUG("Encoding %" ASN_PRI_SIZE " bytes", st->size);
+
+ buf = st->buf;
+ ASN_DEBUG("Encoding %" ASN_PRI_SIZE " in units", size_in_units);
+ do {
+ int need_eom = 0;
+ ssize_t may_save = uper_put_length(po, size_in_units, &need_eom);
+ if(may_save < 0) ASN__ENCODE_FAILED;
+
+ ASN_DEBUG("Encoding %" ASN_PRI_SSIZE " of %" ASN_PRI_SIZE "%s", may_save, size_in_units,
+ need_eom ? ",+EOM" : "");
+
+ ret = OCTET_STRING_per_put_characters(po, buf, may_save, bpc, unit_bits,
+ cval->lower_bound,
+ cval->upper_bound, pc);
+ if(ret) ASN__ENCODE_FAILED;
+
+ buf += may_save * bpc;
+ size_in_units -= may_save;
+ assert(!(may_save & 0x07) || !size_in_units);
+ if(need_eom && uper_put_length(po, 0, 0))
+ ASN__ENCODE_FAILED; /* End of Message length */
+ } while(size_in_units);
+
+ ASN__ENCODED_OK(er);
+}
Code Review / sim / e2-interface.git / blobdiff