/*- * Copyright (c) 2004 Lev Walkin . All rights reserved. * Redistribution and modifications are permitted subject to BSD license. */ /* * Please 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 #include #include /* * 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, 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, 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, void *buf_ptr, size_t size, int tag_mode) { 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 = ((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; long l; tmp.buf = (uint8_t *)buf_ptr; tmp.size = length; if(asn_INTEGER2long(&tmp, &l)) { rval.code = RC_FAIL; rval.consumed = 0; return rval; } *native = l; /* * Note that native integer size might be other than long. * This expression hopefully will be optimized away * by compiler. */ if(sizeof(*native) != sizeof(long) && ((long)*native != l)) { *native = 0; /* Safe value */ rval.code = RC_FAIL; rval.consumed = 0; return rval; } } 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 = 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, void *buf_ptr, size_t size) { asn_dec_rval_t rval; INTEGER_t *st = 0; void *st_ptr = (void *)&st; long *native = (long *)*sptr; if(!native) { *sptr = CALLOC(1, sizeof(int)); native = (long *)*sptr; if(!native) { rval.code = RC_FAIL; rval.consumed = 0; return rval; } } rval = INTEGER_decode_xer(opt_codec_ctx, td, (void **)st_ptr, opt_mname, buf_ptr, size); if(rval.code == RC_OK) { long l; if(asn_INTEGER2long(st, &l)) { rval.code = RC_FAIL; rval.consumed = 0; } else { *native = l; /* Native type might be shorter than long */ if(sizeof(*native) != sizeof(long) && ((long)*native != l)) { *native = 0; /* Safe value */ rval.code = RC_FAIL; rval.consumed = 0; return rval; } } } 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_DEF_INTEGER.free_struct(&asn_DEF_INTEGER, st, 0); 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) { 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), "%ld", *native); if(er.encoded <= 0 || (size_t)er.encoded >= sizeof(scratch) || cb(scratch, er.encoded, app_key) < 0) _ASN_ENCODE_FAILED; 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) { 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), "%ld", *native); assert(ret > 0 && (size_t)ret < sizeof(scratch)); return (cb(scratch, ret, app_key) < 0) ? -1 : 0; } else { return (cb("", 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); } }