Updates

blender-deps/jbigkit-cmake/libjbig/jbig_ar.h

@@ -0,0 +1,53 @@
+/*
+ *  Header file for the arithmetic encoder and decoder of
+ *  the portable JBIG compression library
+ *
+ *  Markus Kuhn -- http://www.cl.cam.ac.uk/~mgk25/jbigkit/
+ */
+
+#ifndef JBG_AR_H
+#define JBG_AR_H
+
+/*
+ * Status of arithmetic encoder
+ */
+
+struct jbg_arenc_state {
+  unsigned char st[4096];    /* probability status for contexts, MSB = MPS */
+  unsigned long c;                /* register C: base of coding intervall, *
+                                   * layout as in Table 23                 */
+  unsigned long a;       /* register A: normalized size of coding interval */
+  long sc;     /* number of buffered 0xff values that might still overflow */
+  int ct;  /* bit shift counter, determines when next byte will be written */
+  int buffer;                /* buffer for most recent output byte != 0xff */
+  void (*byte_out)(int, void *);  /* function that receives all PSCD bytes */
+  void *file;                              /* parameter passed to byte_out */
+};
+
+/*
+ * Status of arithmetic decoder
+ */
+
+struct jbg_ardec_state {
+  unsigned char st[4096];    /* probability status for contexts, MSB = MPS */
+  unsigned long c;                /* register C: base of coding intervall, *
+                                   * layout as in Table 25                 */
+  unsigned long a;       /* register A: normalized size of coding interval */
+  unsigned char *pscd_ptr;               /* pointer to next PSCD data byte */
+  unsigned char *pscd_end;                   /* pointer to byte after PSCD */
+  int ct;    /* bit-shift counter, determines when next byte will be read;
+              * special value -1 signals that zero-padding has started     */
+  int startup;          /* boolean flag that controls initial fill of s->c */
+  int nopadding;        /* boolean flag that triggers return -2 between
+			 * reaching PSCD end and decoding the first symbol
+			 * that might never have been encoded in the first
+			 * place */
+};
+
+void arith_encode_init(struct jbg_arenc_state *s, int reuse_st);
+void arith_encode_flush(struct jbg_arenc_state *s);
+void arith_encode(struct jbg_arenc_state *s, int cx, int pix);
+void arith_decode_init(struct jbg_ardec_state *s, int reuse_st);
+int  arith_decode(struct jbg_ardec_state *s, int cx);
+
+#endif /* JBG_AR_H */