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Improve logging of SIXEL parsing errors.

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This commit is contained in:
Nicholas Marriott
2023-08-23 09:30:20 +01:00
parent dfbc6b1888
commit 071849f82f
1 changed files with 51 additions and 17 deletions
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68
image-sixel.c
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@@ -138,19 +138,29 @@ sixel_parse_attributes(struct sixel_image *si, const char *cp, const char *end)
if (endptr == last || *endptr != ';')
return (last);
strtoul(endptr + 1, &endptr, 10);
if (endptr == last || *endptr != ';')
if (endptr == last || *endptr != ';') {
log_debug("%s: missing ;", __func__);
return (NULL);
}
x = strtoul(endptr + 1, &endptr, 10);
if (endptr == last || *endptr != ';')
if (endptr == last || *endptr != ';') {
log_debug("%s: missing ;", __func__);
return (NULL);
if (x > SIXEL_WIDTH_LIMIT)
}
if (x > SIXEL_WIDTH_LIMIT) {
log_debug("%s: image is too wide", __func__);
return (NULL);
}
y = strtoul(endptr + 1, &endptr, 10);
if (endptr != last)
if (endptr != last) {
log_debug("%s: extra ;", __func__);
return (NULL);
if (y > SIXEL_HEIGHT_LIMIT)
}
if (y > SIXEL_HEIGHT_LIMIT) {
log_debug("%s: image is too tall", __func__);
return (NULL);
}
si->x = x;
sixel_parse_expand_lines(si, y);
@@ -173,27 +183,39 @@ sixel_parse_colour(struct sixel_image *si, const char *cp, const char *end)
}
c = strtoul(cp, &endptr, 10);
if (c > SIXEL_COLOUR_REGISTERS)
if (c > SIXEL_COLOUR_REGISTERS) {
log_debug("%s: too many colours", __func__);
return (NULL);
}
si->dc = c + 1;
if (endptr == last || *endptr != ';')
return (last);
type = strtoul(endptr + 1, &endptr, 10);
if (endptr == last || *endptr != ';')
if (endptr == last || *endptr != ';') {
log_debug("%s: missing ;", __func__);
return (NULL);
}
r = strtoul(endptr + 1, &endptr, 10);
if (endptr == last || *endptr != ';')
if (endptr == last || *endptr != ';') {
log_debug("%s: missing ;", __func__);
return (NULL);
}
g = strtoul(endptr + 1, &endptr, 10);
if (endptr == last || *endptr != ';')
if (endptr == last || *endptr != ';') {
log_debug("%s: missing ;", __func__);
return (NULL);
}
b = strtoul(endptr + 1, &endptr, 10);
if (endptr != last)
if (endptr != last) {
log_debug("%s: missing ;", __func__);
return (NULL);
}
if (type != 1 && type != 2)
if (type != 1 && type != 2) {
log_debug("%s: invalid type %d", __func__, type);
return (NULL);
}
if (c + 1 > si->ncolours) {
si->colours = xrecallocarray(si->colours, si->ncolours, c + 1,
sizeof *si->colours);
@@ -216,21 +238,29 @@ sixel_parse_repeat(struct sixel_image *si, const char *cp, const char *end)
if (*last < '0' || *last > '9')
break;
tmp[n++] = *last++;
if (n == (sizeof tmp) - 1)
if (n == (sizeof tmp) - 1) {
log_debug("%s: repeat not terminated", __func__);
return (NULL);
}
}
if (n == 0 || last == end)
if (n == 0 || last == end) {
log_debug("%s: repeat not terminated", __func__);
return (NULL);
}
tmp[n] = '\0';
n = strtonum(tmp, 1, SIXEL_WIDTH_LIMIT, &errstr);
if (n == 0 || errstr != NULL)
if (n == 0 || errstr != NULL) {
log_debug("%s: repeat too wide", __func__);
return (NULL);
}
ch = (*last++) - 0x3f;
for (i = 0; i < n; i++) {
if (sixel_parse_write(si, ch) != 0)
if (sixel_parse_write(si, ch) != 0) {
log_debug("%s: width limit reached", __func__);
return (NULL);
}
si->dx++;
}
return (last);
@@ -243,8 +273,10 @@ sixel_parse(const char *buf, size_t len, u_int xpixel, u_int ypixel)
const char *cp = buf, *end = buf + len;
char ch;
if (len == 0 || len == 1 || *cp++ != 'q')
if (len == 0 || len == 1 || *cp++ != 'q') {
log_debug("%s: empty image", __func__);
return (NULL);
}
si = xcalloc (1, sizeof *si);
si->xpixel = xpixel;
@@ -280,8 +312,10 @@ sixel_parse(const char *buf, size_t len, u_int xpixel, u_int ypixel)
break;
if (ch < 0x3f || ch > 0x7e)
goto bad;
if (sixel_parse_write(si, ch - 0x3f) != 0)
if (sixel_parse_write(si, ch - 0x3f) != 0) {
log_debug("%s: width limit reached", __func__);
goto bad;
}
si->dx++;
break;
}