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Remove UniqueID key from subsetted Type 1 fonts

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Subsetted fonts must not share the same UniqueID as the original
font.
This commit is contained in:
Adrian Johnson 2008-05-01 23:24:57 +09:30
parent e30cd617c8
commit 6ae1061508
1 changed files with 59 additions and 0 deletions
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59
src/cairo-type1-subset.c
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@ -276,6 +276,47 @@ cairo_type1_font_subset_find_segments (cairo_type1_font_subset_t *font)
return CAIRO_STATUS_SUCCESS;
}
/* Search for the definition of key and erase it by overwriting with spaces.
* This function is looks for definitions of the form:
*
* /key1 1234 def
* /key2 [12 34 56] def
*
* ie a key defined as an integer or array of integers.
*
*/
static void
cairo_type1_font_erase_dict_key (cairo_type1_font_subset_t *font,
const char *key)
{
const char *start, *p, *segment_end;
segment_end = font->header_segment + font->header_segment_size;
start = font->header_segment;
do {
start = find_token (start, segment_end, key);
if (start) {
p = start + strlen(key);
/* skip integers or array of integers */
while (p < segment_end &&
(isspace(*p) ||
isdigit(*p) ||
*p == '[' ||
*p == ']'))
{
p++;
}
if (p + 3 < segment_end && memcmp(p, "def", 3) == 0) {
/* erase definition of the key */
memset((char *) start, ' ', p + 3 - start);
}
start += strlen(key);
}
} while (start);
}
static cairo_status_t
cairo_type1_font_subset_write_header (cairo_type1_font_subset_t *font,
const char *name)
@ -283,6 +324,24 @@ cairo_type1_font_subset_write_header (cairo_type1_font_subset_t *font,
const char *start, *end, *segment_end;
unsigned int i;
/* FIXME:
* This function assumes that /FontName always appears
* before /Encoding. This appears to always be the case with Type1
* fonts.
*
* The more recently added code for removing the UniqueID key can
* not make any assumptions about the position of the UniqueID key
* in the dictionary so it is implemented by overwriting the key
* definition with spaces before we start copying the font to the
* output.
*
* This code should be rewritten to not make any assumptions about
* the order of dictionary keys. This will allow UniqueID to be
* stripped out instead of leaving a bunch of spaces in the
* output.
*/
cairo_type1_font_erase_dict_key (font, "/UniqueID");
segment_end = font->header_segment + font->header_segment_size;
start = find_token (font->header_segment, segment_end, "/FontName");