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jbig2: extract as a full jbig2 file, honor JBIG2Globals

--- a/f_flate.c

+++ b/f_flate.c

@@ -3,7 +3,6 @@

 #include <flate.h>

 #include "pdf.h"

-

 static int

 bw(void *aux, void *d, int n)

 {

--- a/f_jbig2.c

+++ b/f_jbig2.c

@@ -2,11 +2,23 @@

 #include <libc.h>

 #include "pdf.h"

+/* 7.4.7 JBIG2Decode filter */

+

+static u8int bh[] = {

+	/* id string  */ 0x97, 0x4a, 0x42, 0x32, 0x0d, 0x0a, 0x1a, 0x0a,

+	/* sequential */ 0x01,

+	/* one page   */ 0x00, 0x00, 0x00, 0x01,

+};

+

 static int

 flreadall(void *aux, Buffer *bi, Buffer *bo)

 {

-	USED(aux);

+	Stream *s;

+	s = aux;

+	bufput(bo, bh, sizeof(bh));

+	if(s != nil)

+		bufput(bo, s->buf.b, s->buf.sz);

 	bufput(bo, bi->b, bi->sz);

 	bi->off = bi->sz;

@@ -13,7 +25,30 @@

 	return 0;

 }

+static int

+flopen(Filter *f, Object *o)

+{

+	Object *parms, *so;

+	Stream *s;

+

+	parms = dictget(o, "DecodeParms");

+	s = nil;

+	if((so = dictget(parms, "JBIG2Globals")) != &null && (s = Sopen(so)) == nil)

+		return -1;

+	f->aux = s;

+

+	return 0;

+}

+

+static void

+flclose(Filter *f)

+{

+	Sclose(f->aux);

+}

+

 Filter filterJBIG2 = {

 	.name = "JBIG2Decode",

 	.readall = flreadall,

+	.open = flopen,

+	.close = flclose,

 };