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ignore BDC / EMC marked-content operators

--- a/op.c

+++ b/op.c

@@ -739,6 +739,13 @@

 	return 0;

 }

+static int

+opignore(Op *op, Page *p)

+{

+	USED(op, p);

+	return 1;

+}

+

 static Op ops[] = {

 	/* 7.8.2 Compatibility operators */

 	{"BX", cobegin, 0,}, /* begin a compatilibity section */

@@ -836,6 +843,10 @@

 	{"d0", t3width, 2,},   /* width info */

 	{"d1", t3widthbb, 6,}, /* width & bounding box */

+	/* 14.6 Marked content */

+	{"BDC", opignore, 2,},

+	{"EMC", opignore, 0,},

+

 	/* 7.10.5.2 Operators and operands */

 	/* B.2 Arithmetic operators */

 	{"add", t4add, 2,},

@@ -885,7 +896,7 @@

 	{"roll", t4roll, -2,},

 	/* terminator */

-	{nil, nil, 0},

+	{nil, nil, 0,},

 };

 // If an op is found at the current position in the stream, the associated Op is