Logo Search packages:      
Sourcecode: biosig4c++ version File versions  Download package

NativeInteger.c

/*-
 * Copyright (c) 2004, 2005, 2006 Lev Walkin <vlm@lionet.info>.
 * All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
/*
 * Read the NativeInteger.h for the explanation wrt. differences between
 * INTEGER and NativeInteger.
 * Basically, both are decoders and encoders of ASN.1 INTEGER type, but this
 * implementation deals with the standard (machine-specific) representation
 * of them instead of using the platform-independent buffer.
 */
#include <asn_internal.h>
#include <NativeInteger.h>

/*
 * NativeInteger basic type description.
 */
static ber_tlv_tag_t asn_DEF_NativeInteger_tags[] = {
      (ASN_TAG_CLASS_UNIVERSAL | (2 << 2))
};
asn_TYPE_descriptor_t asn_DEF_NativeInteger = {
      "INTEGER",              /* The ASN.1 type is still INTEGER */
      "INTEGER",
      NativeInteger_free,
      NativeInteger_print,
      asn_generic_no_constraint,
      NativeInteger_decode_ber,
      NativeInteger_encode_der,
      NativeInteger_decode_xer,
      NativeInteger_encode_xer,
      NativeInteger_decode_uper,    /* Unaligned PER decoder */
      NativeInteger_encode_uper,    /* Unaligned PER encoder */
      0, /* Use generic outmost tag fetcher */
      asn_DEF_NativeInteger_tags,
      sizeof(asn_DEF_NativeInteger_tags) / sizeof(asn_DEF_NativeInteger_tags[0]),
      asn_DEF_NativeInteger_tags,   /* Same as above */
      sizeof(asn_DEF_NativeInteger_tags) / sizeof(asn_DEF_NativeInteger_tags[0]),
      0,    /* No PER visible constraints */
      0, 0, /* No members */
      0     /* No specifics */
};

/*
 * Decode INTEGER type.
 */
asn_dec_rval_t
NativeInteger_decode_ber(asn_codec_ctx_t *opt_codec_ctx,
      asn_TYPE_descriptor_t *td,
      void **nint_ptr, const void *buf_ptr, size_t size, int tag_mode) {
      asn_INTEGER_specifics_t *specs=(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 occured, 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, &l)
                  : 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(asn_TYPE_descriptor_t *sd, void *ptr,
      int tag_mode, ber_tlv_tag_t tag,
      asn_app_consume_bytes_f *cb, void *app_key) {
      unsigned long native = *(unsigned long *)ptr;   /* Disable sign ext. */
      asn_enc_rval_t erval;
      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.encoded == -1) {
            assert(erval.structure_ptr == &tmp);
            erval.structure_ptr = ptr;
      }
      return erval;
}

/*
 * Decode the chunk of XML text encoding INTEGER.
 */
asn_dec_rval_t
NativeInteger_decode_xer(asn_codec_ctx_t *opt_codec_ctx,
      asn_TYPE_descriptor_t *td, void **sptr, const char *opt_mname,
            const void *buf_ptr, size_t size) {
      asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
      asn_dec_rval_t rval;
      INTEGER_t st;
      void *st_ptr = (void *)&st;
      long *native = (long *)*sptr;

      if(!native) {
            native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
            if(!native) _ASN_DECODE_FAILED;
      }

      memset(&st, 0, sizeof(st));
      rval = INTEGER_decode_xer(opt_codec_ctx, td, &st_ptr, 
            opt_mname, buf_ptr, size);
      if(rval.code == RC_OK) {
            long l;
            if((specs&&specs->field_unsigned)
                  ? asn_INTEGER2ulong(&st, &l)
                  : asn_INTEGER2long(&st, &l)) {
                  rval.code = RC_FAIL;
                  rval.consumed = 0;
            } else {
                  *native = l;
            }
      } else {
            /*
             * Cannot restart from the middle;
             * there is no place to save state in the native type.
             * Request a continuation from the very beginning.
             */
            rval.consumed = 0;
      }
      ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_INTEGER, &st);
      return rval;
}


asn_enc_rval_t
NativeInteger_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
      int ilevel, enum xer_encoder_flags_e flags,
            asn_app_consume_bytes_f *cb, void *app_key) {
      asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
      char scratch[32]; /* Enough for 64-bit int */
      asn_enc_rval_t er;
      const long *native = (const long *)sptr;

      (void)ilevel;
      (void)flags;

      if(!native) _ASN_ENCODE_FAILED;

      er.encoded = snprintf(scratch, sizeof(scratch),
                  (specs && specs->field_unsigned)
                  ? "%lu" : "%ld", *native);
      if(er.encoded <= 0 || (size_t)er.encoded >= sizeof(scratch)
            || cb(scratch, er.encoded, app_key) < 0)
            _ASN_ENCODE_FAILED;

      _ASN_ENCODED_OK(er);
}

asn_dec_rval_t
NativeInteger_decode_uper(asn_codec_ctx_t *opt_codec_ctx,
      asn_TYPE_descriptor_t *td,
      asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {

      asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
      asn_dec_rval_t rval;
      long *native = (long *)*sptr;
      INTEGER_t tmpint;
      void *tmpintptr = &tmpint;

      (void)opt_codec_ctx;
      ASN_DEBUG("Decoding NativeInteger %s (UPER)", td->name);

      if(!native) {
            native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
            if(!native) _ASN_DECODE_FAILED;
      }

      memset(&tmpint, 0, sizeof tmpint);
      rval = INTEGER_decode_uper(opt_codec_ctx, td, constraints,
                           &tmpintptr, pd);
      if(rval.code == RC_OK) {
            if((specs&&specs->field_unsigned)
                  ? asn_INTEGER2ulong(&tmpint, native)
                  : asn_INTEGER2long(&tmpint, native))
                  rval.code = RC_FAIL;
            else
                  ASN_DEBUG("NativeInteger %s got value %ld",
                        td->name, *native);
      }
      ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_INTEGER, &tmpint);

      return rval;
}

asn_enc_rval_t
NativeInteger_encode_uper(asn_TYPE_descriptor_t *td,
      asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
      asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
      asn_enc_rval_t er;
      long native;
      INTEGER_t tmpint;

      if(!sptr) _ASN_ENCODE_FAILED;

      native = *(long *)sptr;

      ASN_DEBUG("Encoding NativeInteger %s %ld (UPER)", td->name, native);

      memset(&tmpint, 0, sizeof(tmpint));
      if((specs&&specs->field_unsigned)
            ? asn_ulong2INTEGER(&tmpint, native)
            : asn_long2INTEGER(&tmpint, native))
            _ASN_ENCODE_FAILED;
      er = INTEGER_encode_uper(td, constraints, &tmpint, po);
      ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_INTEGER, &tmpint);
      return er;
}

/*
 * INTEGER specific human-readable output.
 */
int
NativeInteger_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
      asn_app_consume_bytes_f *cb, void *app_key) {
      asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
      const long *native = (const long *)sptr;
      char scratch[32]; /* Enough for 64-bit int */
      int ret;

      (void)td;   /* Unused argument */
      (void)ilevel;     /* Unused argument */

      if(native) {
            ret = snprintf(scratch, sizeof(scratch),
                  (specs && specs->field_unsigned)
                  ? "%lu" : "%ld", *native);
            assert(ret > 0 && (size_t)ret < sizeof(scratch));
            return (cb(scratch, ret, app_key) < 0) ? -1 : 0;
      } else {
            return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
      }
}

void
NativeInteger_free(asn_TYPE_descriptor_t *td, void *ptr, int contents_only) {

      if(!td || !ptr)
            return;

      ASN_DEBUG("Freeing %s as INTEGER (%d, %p, Native)",
            td->name, contents_only, ptr);

      if(!contents_only) {
            FREEMEM(ptr);
      }
}


Generated by  Doxygen 1.6.0   Back to index