2 files changed, 54 insertions, 1 deletions
diff --git a/include/mupdf.h b/include/mupdf.h
index a1633541..cc455f89 100644
--- a/include/mupdf.h
+++ b/include/mupdf.h
@@ -12,4 +12,4 @@
 #include "mupdf/rsrc.h"
 #include "mupdf/content.h"
 #include "mupdf/page.h"
-
+#include "mupdf/function.h"
diff --git a/include/mupdf/function.h b/include/mupdf/function.h
new file mode 100644
index 00000000..483931b5
--- /dev/null
+++ b/include/mupdf/function.h
@@ -0,0 +1,53 @@
+typedef struct pdf_function_s pdf_function;
+typedef struct psobj_s psobj;
+
+struct pdf_function_s
+{
+	unsigned short type;	/* 0=sample 2=exponential 3=stitching 4=postscript */
+	int m;					/* number of input values */
+	int n;					/* number of output values */
+	float *domain;			/* even index : min value, odd index : max value */
+	float *range;			/* even index : min value, odd index : max value */
+	union
+	{
+		struct {
+			unsigned short bps;
+			unsigned short order;
+			int *size;		/* the num of samples in each input dimension */
+			float *encode;
+			float *decode;
+			int *samples;
+		} sa;
+		struct {
+			float n;
+			float *c0;
+			float *c1;
+		} e;
+		struct {
+			int k;
+			pdf_function **funcs;
+			float *bounds;
+			float *encode;
+		} st;
+		struct {
+			psobj *code;
+			int cap;
+		} p;
+	}u;
+};
+
+struct psobj_s
+{
+	unsigned short type;
+	union {
+		int booln;			// boolean (stack only)
+		int intg;			// integer (stack and code)
+		float real;			// real (stack and code)
+		int op;			// operator (code only)
+		int blk;			// if/ifelse block pointer (code only)
+	};
+};
+
+fz_error *pdf_loadfunction(pdf_function **func, pdf_xref *xref, fz_obj *obj);
+fz_error *pdf_execfunction(pdf_function *func, float *in, int inlen, float *out, int outlen);
+void pdf_freefunc(pdf_function *func);
+\ No newline at end of file