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module-avb: don't encode error as state

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Nils Tonnaett 2026-05-18 12:53:53 -07:00 • committed by Wim Taymans
parent 2dd60fdbc6
commit 4831ba60af
1 changed files with 33 additions and 10 deletions
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43
src/modules/module-avb/strings.c
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@ -4,6 +4,8 @@
#include "strings.h" #include "strings.h"
#include <stdbool.h>
typedef enum { typedef enum {
ST_START, ST_START,
ST_A, ST_A,
@ -13,12 +15,12 @@ typedef enum {
ST_E, ST_E,
ST_F, ST_F,
ST_G, ST_G,
ST_ERROR,
} UTF8_STATE; } UTF8_STATE;
int validate_utf8 (const unsigned char *str, size_t len) int validate_utf8 (const unsigned char *str, size_t len)
{ {
UTF8_STATE state = ST_START; UTF8_STATE state = ST_START;
bool err = false;
for (unsigned int i = 0; i < len; ++i) for (unsigned int i = 0; i < len; ++i)
{ {
@ -63,32 +65,53 @@ int validate_utf8 (const unsigned char *str, size_t len)
} }
else else
{ {
state = ST_ERROR; err = true;
} }
break; break;
case ST_A: case ST_A:
state = (str[i] >= 0x80 && str[i] <= 0xBF) ? ST_START : ST_ERROR; if (str[i] >= 0x80 && str[i] <= 0xBF)
state = ST_START;
else
err = true;
break; break;
case ST_B: case ST_B:
state = (str[i] >= 0x80 && str[i] <= 0xBF) ? ST_A : ST_ERROR; if (str[i] >= 0x80 && str[i] <= 0xBF)
state = ST_A;
else
err = true;
break; break;
case ST_C: case ST_C:
state = (str[i] >= 0xA0 && str[i] <= 0xBF) ? ST_A : ST_ERROR; if (str[i] >= 0xA0 && str[i] <= 0xBF)
state = ST_A;
else
err = true;
break; break;
case ST_D: case ST_D:
state = (str[i] >= 0x80 && str[i] <= 0x9F) ? ST_A : ST_ERROR; if (str[i] >= 0x80 && str[i] <= 0x9F)
state = ST_A;
else
err = true;
break; break;
case ST_E: case ST_E:
state = (str[i] >= 0x80 && str[i] <= 0xBF) ? ST_B : ST_ERROR; if (str[i] >= 0x80 && str[i] <= 0xBF)
state = ST_B;
else
err = true;
break; break;
case ST_F: case ST_F:
state = (str[i] >= 0x90 && str[i] <= 0xBF) ? ST_B : ST_ERROR; if (str[i] >= 0x90 && str[i] <= 0xBF)
state = ST_B;
else
err = true;
break; break;
case ST_G: case ST_G:
state = (str[i] >= 0x80 && str[i] <= 0x8F) ? ST_B : ST_ERROR; if (str[i] >= 0x80 && str[i] <= 0x8F)
state = ST_B;
else
err = true;
break; break;
} }
if (state == ST_ERROR) if (err == true)
{ {
return -1; return -1;
} }