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module-avb: add UTF-8 validation function

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Nils Tonnaett 2026-05-12 23:34:44 -07:00 • committed by Wim Taymans
parent 6a0c0d45ff
commit b47c07b9cd
3 changed files with 91 additions and 0 deletions
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78
src/modules/module-avb/strings.c Normal file
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/* SPDX-FileCopyrightText: Copyright © 2026 Nils Tonnaett
* Nils Tonnaett <ntonnatt@ccrma.stanford.edu> */
/* SPDX-License-Identifier: MIT */
#include "strings.h"
typedef enum {
ST_START,
ST_A,
ST_B,
ST_C,
ST_D,
ST_E,
ST_F,
ST_G,
ST_ERROR,
} UTF8_STATE;
int validate_utf8(uint8_t *str, size_t len) {
UTF8_STATE state = ST_START;
for (int i = 0; i < len; ++i) {
switch (state) {
case ST_START:
if (str[i] <= 0x7F) {
continue;
} else if (str[i] >= 0xC2 && str[i] <= 0xDF) {
state = ST_A;
} else if (str[i] >= 0xE1 && str[i] <= 0xEC) {
state = ST_B;
} else if (str[i] >= 0xEE && str[i] <= 0xEF) {
state = ST_B;
} else if (str[i] == 0xE0) {
state = ST_C;
} else if (str[i] == 0xED) {
state = ST_D;
} else if (str[i] >= 0xF1 && str[i] <= 0xF3) {
state = ST_E;
} else if (str[i] == 0xF0) {
state = ST_F;
} else if (str[i] >= 0xF4) {
state = ST_G;
} else {
state = ST_ERROR;
}
break;
case ST_A:
state = (str[i] >= 0x80 && str[i] <= 0xBF) ? ST_START : ST_ERROR;
break;
case ST_B:
state = (str[i] >= 0x80 && str[i] <= 0xBF) ? ST_A : ST_ERROR;
break;
case ST_C:
state = (str[i] >= 0xA0 && str[i] <= 0xBF) ? ST_A : ST_ERROR;
break;
case ST_D:
state = (str[i] >= 0x80 && str[i] <= 0x9F) ? ST_A : ST_ERROR;
break;
case ST_E:
state = (str[i] >= 0x80 && str[i] <= 0xBF) ? ST_B : ST_ERROR;
break;
case ST_F:
state = (str[i] >= 0x90 && str[i] <= 0xBF) ? ST_B : ST_ERROR;
break;
case ST_G:
state = (str[i] >= 0x80 && str[i] <= 0x8F) ? ST_B : ST_ERROR;
break;
}
if (state == ST_ERROR) {
return -1;
}
}
if (state != ST_START) {
return -1;
} else {
return 0;
}
}