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convttf: Add sanity checking to specified defaultchar

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It now matches the logic in convbdf

Change-Id: Ic17fdd4dbed41fad4d3353b9dd314cd24a8ded58
This commit is contained in:
Solomon Peachy 2026-05-29 07:33:36 -04:00
parent f17effbe8f
commit 8af98332ab
1 changed files with 10 additions and 2 deletions
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12
tools/convttf.c
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@ -94,7 +94,7 @@ int pct = 0; /* display ttc table if it is not zero. */
FT_Long max_char = 0x10FFFF;
int pixel_size = 15;
FT_Long start_char = 0;
FT_Long defaultchar = 0;
FT_Long defaultchar = -1;
FT_Long limit_char;
FT_Long firstchar = 0;
FT_Long lastchar;
@ -714,7 +714,15 @@ void convttf(char* path, char* destfile, FT_Long face_index)
if (code <= firstchar)
firstchar = code;
}
export_font.header.defaultchar = defaultchar - firstchar;
/* calc default char */
if (defaultchar < 0 ||
defaultchar < firstchar ||
defaultchar > limit_char ||
defaultchar > lastchar)
defaultchar = firstchar;
export_font.header.defaultchar = defaultchar;
export_font.header.firstchar = firstchar;
export_font.header.size = lastchar - firstchar + 1;
export_font.header.nbits = idx;