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cff: Allow empty array of operands for certain operators

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Operators BlueValues, OtherBlues, FamilyBlues, FamilyOtherBlues,
StemSnapH and StemSnapV have operands of type delta which can be
a number or an array of delta-encoded numbers. This array can be
empty according to freetype developers.
This commit checks whether current operator is among those listed
and permits empty operand in such case.
This commit is contained in:
Marek Kasik 2020-03-27 19:39:46 +01:00 • committed by Bryce Harrington
parent c43ff33c43
commit 590122daa8
1 changed files with 49 additions and 29 deletions
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78
src/cairo-cff-subset.c
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@ -56,30 +56,36 @@
/* CFF Dict Operators. If the high byte is 0 the command is encoded
* with a single byte. */
#define BASEFONTNAME_OP 0x0c16
#define CIDCOUNT_OP 0x0c22
#define CHARSET_OP 0x000f
#define CHARSTRINGS_OP 0x0011
#define COPYRIGHT_OP 0x0c00
#define DEFAULTWIDTH_OP 0x0014
#define ENCODING_OP 0x0010
#define FAMILYNAME_OP 0x0003
#define FDARRAY_OP 0x0c24
#define FDSELECT_OP 0x0c25
#define FONTBBOX_OP 0x0005
#define FONTMATRIX_OP 0x0c07
#define FONTNAME_OP 0x0c26
#define FULLNAME_OP 0x0002
#define LOCAL_SUB_OP 0x0013
#define NOMINALWIDTH_OP 0x0015
#define NOTICE_OP 0x0001
#define POSTSCRIPT_OP 0x0c15
#define PRIVATE_OP 0x0012
#define ROS_OP 0x0c1e
#define UNIQUEID_OP 0x000d
#define VERSION_OP 0x0000
#define WEIGHT_OP 0x0004
#define XUID_OP 0x000e
#define BASEFONTNAME_OP 0x0c16
#define CIDCOUNT_OP 0x0c22
#define CHARSET_OP 0x000f
#define CHARSTRINGS_OP 0x0011
#define COPYRIGHT_OP 0x0c00
#define DEFAULTWIDTH_OP 0x0014
#define ENCODING_OP 0x0010
#define FAMILYNAME_OP 0x0003
#define FDARRAY_OP 0x0c24
#define FDSELECT_OP 0x0c25
#define FONTBBOX_OP 0x0005
#define FONTMATRIX_OP 0x0c07
#define FONTNAME_OP 0x0c26
#define FULLNAME_OP 0x0002
#define LOCAL_SUB_OP 0x0013
#define NOMINALWIDTH_OP 0x0015
#define NOTICE_OP 0x0001
#define POSTSCRIPT_OP 0x0c15
#define PRIVATE_OP 0x0012
#define ROS_OP 0x0c1e
#define UNIQUEID_OP 0x000d
#define VERSION_OP 0x0000
#define WEIGHT_OP 0x0004
#define XUID_OP 0x000e
#define BLUEVALUES_OP 0x0006
#define OTHERBLUES_OP 0x0007
#define FAMILYBLUES_OP 0x0008
#define FAMILYOTHERBLUES_OP 0x0009
#define STEMSNAPH_OP 0x0c0c
#define STEMSNAPV_OP 0x0c0d
#define NUM_STD_STRINGS 391
@ -615,13 +621,27 @@ cff_dict_create_operator (int operator,
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_dict_init_key (op, operator);
op->operand = _cairo_malloc (size);
if (unlikely (op->operand == NULL)) {
free (op);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (size != 0) {
op->operand = _cairo_malloc (size);
if (unlikely (op->operand == NULL)) {
free (op);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
memcpy (op->operand, operand, size);
} else {
op->operand = NULL;
/* Delta-encoded arrays can be empty. */
if (operator != BLUEVALUES_OP &&
operator != OTHERBLUES_OP &&
operator != FAMILYBLUES_OP &&
operator != FAMILYOTHERBLUES_OP &&
operator != STEMSNAPH_OP &&
operator != STEMSNAPV_OP) {
free (op);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
}
memcpy (op->operand, operand, size);
op->operand_length = size;
op->operand_offset = -1;