mirror of https://gerrit.osmocom.org/asn1c
485 lines
14 KiB
C
485 lines
14 KiB
C
/*-
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* Copyright (c) 2004, 2005, 2006 Lev Walkin <vlm@lionet.info>.
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* All rights reserved.
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* Redistribution and modifications are permitted subject to BSD license.
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*/
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/*
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* Read the NativeInteger.h for the explanation wrt. differences between
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* INTEGER and NativeInteger.
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* Basically, both are decoders and encoders of ASN.1 INTEGER type, but this
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* implementation deals with the standard (machine-specific) representation
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* of them instead of using the platform-independent buffer.
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*/
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#include <asn_internal.h>
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#include <NativeInteger.h>
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/*
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* NativeInteger basic type description.
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*/
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static const ber_tlv_tag_t asn_DEF_NativeInteger_tags[] = {
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(ASN_TAG_CLASS_UNIVERSAL | (2 << 2))
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};
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asn_TYPE_operation_t asn_OP_NativeInteger = {
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NativeInteger_free,
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NativeInteger_print,
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NativeInteger_compare,
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NativeInteger_decode_ber,
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NativeInteger_encode_der,
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NativeInteger_decode_xer,
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NativeInteger_encode_xer,
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#ifdef ASN_DISABLE_OER_SUPPORT
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0,
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0,
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#else
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NativeInteger_decode_oer, /* OER decoder */
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NativeInteger_encode_oer, /* Canonical OER encoder */
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#endif /* ASN_DISABLE_OER_SUPPORT */
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#ifdef ASN_DISABLE_PER_SUPPORT
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0,
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0,
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#else
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NativeInteger_decode_uper, /* Unaligned PER decoder */
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NativeInteger_encode_uper, /* Unaligned PER encoder */
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#endif /* ASN_DISABLE_PER_SUPPORT */
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NativeInteger_random_fill,
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0 /* Use generic outmost tag fetcher */
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};
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asn_TYPE_descriptor_t asn_DEF_NativeInteger = {
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"INTEGER", /* The ASN.1 type is still INTEGER */
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"INTEGER",
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&asn_OP_NativeInteger,
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asn_DEF_NativeInteger_tags,
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sizeof(asn_DEF_NativeInteger_tags) / sizeof(asn_DEF_NativeInteger_tags[0]),
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asn_DEF_NativeInteger_tags, /* Same as above */
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sizeof(asn_DEF_NativeInteger_tags) / sizeof(asn_DEF_NativeInteger_tags[0]),
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{ 0, 0, asn_generic_no_constraint },
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0, 0, /* No members */
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0 /* No specifics */
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};
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/*
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* Decode INTEGER type.
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*/
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asn_dec_rval_t
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NativeInteger_decode_ber(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td, void **nint_ptr,
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const void *buf_ptr, size_t size, int tag_mode) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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long *native = (long *)*nint_ptr;
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asn_dec_rval_t rval;
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ber_tlv_len_t length;
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/*
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* If the structure is not there, allocate it.
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*/
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if(native == NULL) {
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native = (long *)(*nint_ptr = CALLOC(1, sizeof(*native)));
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if(native == NULL) {
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rval.code = RC_FAIL;
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rval.consumed = 0;
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return rval;
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}
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}
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ASN_DEBUG("Decoding %s as INTEGER (tm=%d)",
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td->name, tag_mode);
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/*
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* Check tags.
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*/
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rval = ber_check_tags(opt_codec_ctx, td, 0, buf_ptr, size,
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tag_mode, 0, &length, 0);
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if(rval.code != RC_OK)
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return rval;
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ASN_DEBUG("%s length is %d bytes", td->name, (int)length);
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/*
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* Make sure we have this length.
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*/
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buf_ptr = ((const char *)buf_ptr) + rval.consumed;
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size -= rval.consumed;
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if(length > (ber_tlv_len_t)size) {
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rval.code = RC_WMORE;
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rval.consumed = 0;
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return rval;
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}
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/*
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* ASN.1 encoded INTEGER: buf_ptr, length
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* Fill the native, at the same time checking for overflow.
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* If overflow occurred, return with RC_FAIL.
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*/
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{
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INTEGER_t tmp;
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union {
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const void *constbuf;
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void *nonconstbuf;
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} unconst_buf;
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long l;
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unconst_buf.constbuf = buf_ptr;
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tmp.buf = (uint8_t *)unconst_buf.nonconstbuf;
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tmp.size = length;
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if((specs&&specs->field_unsigned)
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? asn_INTEGER2ulong(&tmp, (unsigned long *)&l) /* sic */
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: asn_INTEGER2long(&tmp, &l)) {
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rval.code = RC_FAIL;
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rval.consumed = 0;
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return rval;
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}
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*native = l;
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}
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rval.code = RC_OK;
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rval.consumed += length;
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ASN_DEBUG("Took %ld/%ld bytes to encode %s (%ld)",
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(long)rval.consumed, (long)length, td->name, (long)*native);
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return rval;
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}
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/*
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* Encode the NativeInteger using the standard INTEGER type DER encoder.
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*/
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asn_enc_rval_t
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NativeInteger_encode_der(const asn_TYPE_descriptor_t *sd, const void *ptr,
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int tag_mode, ber_tlv_tag_t tag,
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asn_app_consume_bytes_f *cb, void *app_key) {
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unsigned long native = *(const unsigned long *)ptr; /* Disable sign ext. */
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asn_enc_rval_t erval;
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INTEGER_t tmp;
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#ifdef WORDS_BIGENDIAN /* Opportunistic optimization */
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tmp.buf = (uint8_t *)&native;
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tmp.size = sizeof(native);
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#else /* Works even if WORDS_BIGENDIAN is not set where should've been */
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uint8_t buf[sizeof(native)];
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uint8_t *p;
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/* Prepare a fake INTEGER */
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for(p = buf + sizeof(buf) - 1; p >= buf; p--, native >>= 8)
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*p = (uint8_t)native;
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tmp.buf = buf;
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tmp.size = sizeof(buf);
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#endif /* WORDS_BIGENDIAN */
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/* Encode fake INTEGER */
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erval = INTEGER_encode_der(sd, &tmp, tag_mode, tag, cb, app_key);
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if(erval.structure_ptr == &tmp) {
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erval.structure_ptr = ptr;
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}
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return erval;
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}
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/*
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* Decode the chunk of XML text encoding INTEGER.
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*/
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asn_dec_rval_t
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NativeInteger_decode_xer(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td, void **sptr,
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const char *opt_mname, const void *buf_ptr,
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size_t size) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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asn_dec_rval_t rval;
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INTEGER_t st;
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void *st_ptr = (void *)&st;
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long *native = (long *)*sptr;
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if(!native) {
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native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
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if(!native) ASN__DECODE_FAILED;
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}
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memset(&st, 0, sizeof(st));
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rval = INTEGER_decode_xer(opt_codec_ctx, td, &st_ptr,
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opt_mname, buf_ptr, size);
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if(rval.code == RC_OK) {
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long l;
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if((specs&&specs->field_unsigned)
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? asn_INTEGER2ulong(&st, (unsigned long *)&l) /* sic */
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: asn_INTEGER2long(&st, &l)) {
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rval.code = RC_FAIL;
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rval.consumed = 0;
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} else {
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*native = l;
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}
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} else {
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/*
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* Cannot restart from the middle;
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* there is no place to save state in the native type.
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* Request a continuation from the very beginning.
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*/
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rval.consumed = 0;
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}
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ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_INTEGER, &st);
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return rval;
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}
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asn_enc_rval_t
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NativeInteger_encode_xer(const asn_TYPE_descriptor_t *td, const void *sptr,
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int ilevel, enum xer_encoder_flags_e flags,
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asn_app_consume_bytes_f *cb, void *app_key) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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char scratch[32]; /* Enough for 64-bit int */
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asn_enc_rval_t er;
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const long *native = (const long *)sptr;
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(void)ilevel;
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(void)flags;
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if(!native) ASN__ENCODE_FAILED;
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er.encoded = snprintf(scratch, sizeof(scratch),
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(specs && specs->field_unsigned)
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? "%lu" : "%ld", *native);
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if(er.encoded <= 0 || (size_t)er.encoded >= sizeof(scratch)
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|| cb(scratch, er.encoded, app_key) < 0)
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ASN__ENCODE_FAILED;
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ASN__ENCODED_OK(er);
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}
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#ifndef ASN_DISABLE_PER_SUPPORT
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asn_dec_rval_t
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NativeInteger_decode_uper(const asn_codec_ctx_t *opt_codec_ctx,
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const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints, void **sptr,
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asn_per_data_t *pd) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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asn_dec_rval_t rval;
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long *native = (long *)*sptr;
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INTEGER_t tmpint;
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void *tmpintptr = &tmpint;
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(void)opt_codec_ctx;
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ASN_DEBUG("Decoding NativeInteger %s (UPER)", td->name);
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if(!native) {
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native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
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if(!native) ASN__DECODE_FAILED;
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}
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memset(&tmpint, 0, sizeof tmpint);
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rval = INTEGER_decode_uper(opt_codec_ctx, td, constraints,
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&tmpintptr, pd);
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if(rval.code == RC_OK) {
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if((specs&&specs->field_unsigned)
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? asn_INTEGER2ulong(&tmpint, (unsigned long *)native)
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: asn_INTEGER2long(&tmpint, native))
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rval.code = RC_FAIL;
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else
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ASN_DEBUG("NativeInteger %s got value %ld",
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td->name, *native);
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}
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ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_INTEGER, &tmpint);
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return rval;
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}
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asn_enc_rval_t
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NativeInteger_encode_uper(const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints,
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const void *sptr, asn_per_outp_t *po) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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asn_enc_rval_t er;
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long native;
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INTEGER_t tmpint;
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if(!sptr) ASN__ENCODE_FAILED;
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native = *(const long *)sptr;
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ASN_DEBUG("Encoding NativeInteger %s %ld (UPER)", td->name, native);
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memset(&tmpint, 0, sizeof(tmpint));
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if((specs&&specs->field_unsigned)
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? asn_ulong2INTEGER(&tmpint, native)
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: asn_long2INTEGER(&tmpint, native))
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ASN__ENCODE_FAILED;
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er = INTEGER_encode_uper(td, constraints, &tmpint, po);
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ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_INTEGER, &tmpint);
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return er;
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}
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#endif /* ASN_DISABLE_PER_SUPPORT */
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/*
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* INTEGER specific human-readable output.
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*/
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int
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NativeInteger_print(const asn_TYPE_descriptor_t *td, const void *sptr,
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int ilevel, asn_app_consume_bytes_f *cb, void *app_key) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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const long *native = (const long *)sptr;
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char scratch[32]; /* Enough for 64-bit int */
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int ret;
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(void)td; /* Unused argument */
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(void)ilevel; /* Unused argument */
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if(native) {
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long value = *native;
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ret = snprintf(scratch, sizeof(scratch),
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(specs && specs->field_unsigned) ? "%lu" : "%ld", value);
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assert(ret > 0 && (size_t)ret < sizeof(scratch));
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if(cb(scratch, ret, app_key) < 0) return -1;
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if(specs && (value >= 0 || !specs->field_unsigned)) {
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const asn_INTEGER_enum_map_t *el =
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INTEGER_map_value2enum(specs, value);
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if(el) {
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if(cb(" (", 2, app_key) < 0) return -1;
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if(cb(el->enum_name, el->enum_len, app_key) < 0) return -1;
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if(cb(")", 1, app_key) < 0) return -1;
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}
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}
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return 0;
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} else {
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return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
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}
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}
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void
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NativeInteger_free(const asn_TYPE_descriptor_t *td, void *ptr,
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enum asn_struct_free_method method) {
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if(!td || !ptr)
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return;
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ASN_DEBUG("Freeing %s as INTEGER (%d, %p, Native)",
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td->name, method, ptr);
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switch(method) {
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case ASFM_FREE_EVERYTHING:
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FREEMEM(ptr);
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break;
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case ASFM_FREE_UNDERLYING:
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break;
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case ASFM_FREE_UNDERLYING_AND_RESET:
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memset(ptr, 0, sizeof(long));
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break;
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}
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}
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int
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NativeInteger_compare(const asn_TYPE_descriptor_t *td, const void *aptr, const void *bptr) {
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(void)td;
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if(aptr && bptr) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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if(specs && specs->field_unsigned) {
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const unsigned long *a = aptr;
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const unsigned long *b = bptr;
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if(*a < *b) {
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return -1;
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} else if(*a > *b) {
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return 1;
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} else {
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return 0;
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}
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} else {
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const long *a = aptr;
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const long *b = bptr;
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if(*a < *b) {
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return -1;
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} else if(*a > *b) {
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return 1;
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} else {
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return 0;
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}
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}
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} else if(!aptr) {
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return -1;
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} else {
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return 1;
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}
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}
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asn_random_fill_result_t
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NativeInteger_random_fill(const asn_TYPE_descriptor_t *td, void **sptr,
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const asn_encoding_constraints_t *constraints,
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size_t max_length) {
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const asn_INTEGER_specifics_t *specs =
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(const asn_INTEGER_specifics_t *)td->specifics;
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asn_random_fill_result_t result_ok = {ARFILL_OK, 1};
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asn_random_fill_result_t result_failed = {ARFILL_FAILED, 0};
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asn_random_fill_result_t result_skipped = {ARFILL_SKIPPED, 0};
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long *st = *sptr;
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const asn_INTEGER_enum_map_t *emap;
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size_t emap_len;
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intmax_t value;
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int find_inside_map;
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if(max_length == 0) return result_skipped;
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if(st == NULL) {
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st = (long *)CALLOC(1, sizeof(*st));
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if(st == NULL) {
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return result_failed;
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}
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}
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if(specs) {
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emap = specs->value2enum;
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emap_len = specs->map_count;
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if(specs->strict_enumeration) {
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find_inside_map = emap_len > 0;
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} else {
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find_inside_map = emap_len ? asn_random_between(0, 1) : 0;
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}
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} else {
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emap = 0;
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emap_len = 0;
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find_inside_map = 0;
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}
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if(find_inside_map) {
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assert(emap_len > 0);
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value = emap[asn_random_between(0, emap_len - 1)].nat_value;
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} else {
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const asn_per_constraints_t *ct;
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static const long variants[] = {
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-65536, -65535, -65534, -32769, -32768, -32767, -16385, -16384,
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-16383, -257, -256, -255, -254, -129, -128, -127,
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-126, -1, 0, 1, 126, 127, 128, 129,
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254, 255, 256, 257, 16383, 16384, 16385, 32767,
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32768, 32769, 65534, 65535, 65536, 65537};
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if(specs && specs->field_unsigned) {
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assert(variants[18] == 0);
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value = variants[asn_random_between(
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18, sizeof(variants) / sizeof(variants[0]) - 1)];
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} else {
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value = variants[asn_random_between(
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0, sizeof(variants) / sizeof(variants[0]) - 1)];
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}
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if(!constraints) constraints = &td->encoding_constraints;
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ct = constraints ? constraints->per_constraints : 0;
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if(ct && (ct->value.flags & APC_CONSTRAINED)) {
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if(value < ct->value.lower_bound || value > ct->value.upper_bound) {
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value = asn_random_between(ct->value.lower_bound,
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ct->value.upper_bound);
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}
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}
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}
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*sptr = st;
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*st = value;
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return result_ok;
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}
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