1 files changed, 115 insertions, 0 deletions
diff --git a/stream/filt_jbig2d.c b/stream/filt_jbig2d.c
new file mode 100644
index 00000000..ed54eed3
--- /dev/null
+++ b/stream/filt_jbig2d.c
@@ -0,0 +1,115 @@
+#include <fitz.h>
+
+/* TODO: complete rewrite with error checking and use fitz memctx */
+
+/*
+<rillian> so to use a global_ctx, you run your global data through a normal ctx
+<rillian> then call jbig2_make_global_ctx with the normal context
+<rillian> that does the (currently null) conversion
+<maskros> make_global_ctx after i fed it all the global stream data?
+<rillian> maskros: yes
+<rillian> and you pass the new global ctx object to jbig2_ctx_new() when you
++create the per-page ctx
+*/
+
+#ifdef WIN32 /* Microsoft Visual C++ */
+
+typedef signed char             int8_t;
+typedef short int               int16_t;
+typedef int                     int32_t;
+typedef __int64                 int64_t;
+
+typedef unsigned char             uint8_t;
+typedef unsigned short int        uint16_t;
+typedef unsigned int              uint32_t;
+
+#else
+#include <inttypes.h>
+#endif
+
+#include <jbig2.h>
+
+typedef struct fz_jbig2d_s fz_jbig2d;
+
+struct fz_jbig2d_s
+{
+	fz_filter super;
+	Jbig2Ctx *ctx;
+	Jbig2GlobalCtx *gctx;
+	Jbig2Image *page;
+	int idx;
+};
+
+fz_error *
+fz_newjbig2d(fz_filter **fp, fz_obj *params)
+{
+	FZ_NEWFILTER(fz_jbig2d, d, jbig2d);
+	d->ctx = jbig2_ctx_new(nil, JBIG2_OPTIONS_EMBEDDED, nil, nil, nil);
+	d->page = nil;
+	d->idx = 0;
+	return nil;
+}
+
+void
+fz_dropjbig2d(fz_filter *filter)
+{
+	fz_jbig2d *d = (fz_jbig2d*)filter;
+	jbig2_ctx_free(d->ctx);
+}
+
+fz_error *
+fz_setjbig2dglobalstream(fz_filter *filter, unsigned char *buf, int len)
+{
+	fz_jbig2d *d = (fz_jbig2d*)filter;
+	jbig2_data_in(d->ctx, buf, len);
+	d->gctx = jbig2_make_global_ctx(d->ctx);
+	d->ctx = jbig2_ctx_new(nil, JBIG2_OPTIONS_EMBEDDED, d->gctx, nil, nil);
+	return nil;
+}
+
+fz_error *
+fz_processjbig2d(fz_filter *filter, fz_buffer *in, fz_buffer *out)
+{
+	fz_jbig2d *d = (fz_jbig2d*)filter;
+	int len;
+	int i;
+
+	while (1)
+	{
+		if (in->rp == in->wp) {
+			if (!in->eof)
+				return fz_ioneedin;
+
+			if (!d->page) {
+				jbig2_complete_page(d->ctx);
+				d->page = jbig2_page_out(d->ctx);
+			}
+
+			if (out->wp == out->ep)
+				return fz_ioneedout;
+
+			len = out->ep - out->wp;
+			if (d->idx + len > d->page->height * d->page->stride)
+				len = d->page->height * d->page->stride - d->idx;
+
+			/* XXX memcpy(out->wp, d->page->data + d->idx, len); */
+			for (i = 0; i < len; i++)
+				out->wp[i] = ~ d->page->data[d->idx + i];
+
+			out->wp += len;
+			d->idx += len;
+
+			if (d->idx == d->page->height * d->page->stride) {
+				jbig2_release_page(d->ctx, d->page);
+				out->eof = 1;
+				return fz_iodone;
+			}
+		}
+		else {
+			len = in->wp - in->rp;
+			jbig2_data_in(d->ctx, in->rp, len);
+			in->rp += len;
+		}
+	}
+}
+