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diff --git a/xicc/ccss.h b/xicc/ccss.h
new file mode 100644
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+#ifndef CCSS_H
+#define CCSS_H
+
+/* 
+ * Argyll Color Correction System
+ * Colorimeter Calibration Spectral Set support.
+ *
+ * Author: Graeme W. Gill
+ * Date:   18/8/2011
+ *
+ * Copyright 2010 Graeme W. Gill
+ * All rights reserved.
+ *
+ * This material is licenced under the GNU GENERAL PUBLIC LICENSE Version 2 or later :-
+ * see the License2.txt file for licencing details.
+ *
+ * Based on ccmx.h
+ */
+
+/*
+ * This object provides storage and application of emisive spectral
+ * samples that can be used to compute calibration for suitable
+ * colorimeters (such as the i1d3) tuned for particular types of displays.
+ */
+
+/* ------------------------------------------------------------------------------ */
+
+struct _ccss {
+
+  /* Public: */
+	void (*del)(struct _ccss *p);
+
+	/* Set the contents of the ccss. return nz on error. */
+	/* (Makes copies of all parameters) */
+	int (*set_ccss)(struct _ccss *p, char *orig, char *cdate,
+	                char *desc, char *disp, char *tech, int refrmode, char *sel,
+	                char *ref, xspect *samples, int no_samp);	
+
+	/* write to a CGATS .ccss file */
+	/* return nz on error, with message in err[] */
+	int (*write_ccss)(struct _ccss *p, char *filename);
+
+	/* write a CGATS .ccss file to a memory buffer. */
+	/* return nz on error, with message in err[] */
+	int (*buf_write_ccss)(struct _ccss *p, unsigned char **buf, int *len);
+
+	/* read from a CGATS .ccss file */
+	/* return nz on error, with message in err[] */
+	int (*read_ccss)(struct _ccss *p, char *filename);
+
+	/* read from a CGATS .ccss file from a memory buffer. */
+	/* return nz on error, with message in err[] */
+	int (*buf_read_ccss)(struct _ccss *p, unsigned char *buf, int len);
+
+  /* Private: */
+	/* (All char * are owned by ccss) */
+	char *orig;			/* Originator. May be NULL */
+	char *crdate;		/* Creation date (in ctime() format). May be NULL */
+	char *desc;			/* General Description (optional) */
+	char *disp;			/* Description of the display (Manfrr and Model No) (optional if tech) */
+	char *tech;			/* Technology (CRT, LCD + backlight type etc.) (optional if disp) */
+	int refrmode;		/* Refresh mode, -1 if unknown, 0 of no, 1 if yes */
+	char *sel;			/* Optional UI selector characters. May be NULL */
+	char *ref;			/* Name of reference spectrometer instrument (optional) */
+	xspect *samples;	/* Set of spectral samples */
+	int no_samp;		/* Number of samples */
+	
+	/* Houskeeping - should switch this to a1log ? */
+	int errc;				/* Error code */
+	char err[200];			/* Error message */
+}; typedef struct _ccss ccss;
+
+/* Create a new, uninitialised ccss */
+ccss *new_ccss(void);
+
+#endif /* CCSS_H */
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