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Avoid a crash on invalid vector fonts

This commit is contained in:
Matthias Koefferlein 2026-08-15 00:09:34 +02:00
parent fb26cf6433
commit 2e54668001
1 changed files with 17 additions and 0 deletions
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17
src/db/db/dbHershey.cc
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@ -95,9 +95,19 @@ hershey_font_names ()
return ff;
}
static unsigned int safe_font (unsigned int f)
{
if (f >= (unsigned int) (sizeof (fonts) / sizeof (fonts [0]))) {
return 0;
} else {
return f;
}
}
size_t
hershey_count_edges (const std::string &s, unsigned int f)
{
f = safe_font (f);
HersheyFont *fp = fonts [f];
size_t n = 0;
@ -127,18 +137,21 @@ hershey_count_edges (const std::string &s, unsigned int f)
int
hershey_font_width (unsigned int f)
{
f = safe_font (f);
return fonts [f]->width;
}
int
hershey_font_height (unsigned int f)
{
f = safe_font (f);
return fonts [f]->height;
}
db::DBox
hershey_text_box (const std::string &s, unsigned int f)
{
f = safe_font (f);
HersheyFont *fp = fonts [f];
int wl = 0;
@ -183,6 +196,8 @@ hershey_text_box (const std::string &s, unsigned int f)
void
hershey_justify (const std::string &s, unsigned int f, db::DBox bx, HAlign halign, VAlign valign, std::vector<db::DPoint> &linestarts, double &left, double &bottom)
{
f = safe_font (f);
left = 0.0;
bottom = 0.0;
@ -253,6 +268,8 @@ hershey_justify (const std::string &s, unsigned int f, db::DBox bx, HAlign halig
basic_hershey_edge_iterator::basic_hershey_edge_iterator (const std::string &s, unsigned int f, const std::vector<db::DPoint> &line_starts)
: m_line (0), m_string (s), m_edge (0), m_edge_end (0), m_linestarts (line_starts)
{
f = safe_font (f);
m_fp = fonts [f];
mp_cp = m_string.c_str ();