forked from acouzens/open5gs
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
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* Copyright (c) 2017 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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#include <asn_internal.h>
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#include <UTF8String.h>
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/*
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* Biased function for randomizing UTF-8 sequences.
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*/
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static size_t
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UTF8String__random_char(uint8_t *b, size_t size) {
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static const struct rnd_value {
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const char *value;
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size_t size;
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} values[] = {{"\0", 1},
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{"\x01", 1},
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{"\x7f", 1},
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{"\xc2\xa2", 2},
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{"\xe2\x82\xac", 3},
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{"\xf0\x90\x8d\x88", 4},
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{"\xf4\x8f\xbf\xbf", 4}};
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const struct rnd_value *v;
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size_t max_idx = 0;
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switch(size) {
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case 0:
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assert(size != 0);
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return 0;
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case 1:
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max_idx = 2;
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break;
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case 2:
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max_idx = 3;
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break;
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default:
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case 4:
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max_idx = sizeof(values) / sizeof(values[0]) - 1;
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break;
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}
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v = &values[asn_random_between(0, max_idx)];
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memcpy(b, v->value, v->size);
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return v->size;
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}
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asn_random_fill_result_t
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UTF8String_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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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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uint8_t *buf;
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uint8_t *bend;
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uint8_t *b;
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size_t rnd_len;
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size_t idx;
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UTF8String_t *st;
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if(max_length == 0 && !*sptr) return result_skipped;
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/* Figure out how far we should go */
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rnd_len = OCTET_STRING_random_length_constrained(td, constraints,
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max_length / 4);
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buf = CALLOC(4, rnd_len + 1);
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if(!buf) return result_failed;
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bend = &buf[4 * rnd_len];
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for(b = buf, idx = 0; idx < rnd_len; idx++) {
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b += UTF8String__random_char(b, (bend - b));
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}
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*(uint8_t *)b = 0;
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if(*sptr) {
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st = *sptr;
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FREEMEM(st->buf);
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} else {
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st = (OCTET_STRING_t *)(*sptr = CALLOC(1, sizeof(UTF8String_t)));
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if(!st) {
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FREEMEM(buf);
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return result_failed;
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}
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}
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st->buf = buf;
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st->size = b - buf;
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assert(UTF8String_length(st) == (ssize_t)rnd_len);
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return result_ok;
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}
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