1 files changed, 55 insertions, 0 deletions
diff --git a/pstoraster/shcgen.h b/pstoraster/shcgen.h
new file mode 100644
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+++ b/pstoraster/shcgen.h
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+/* Copyright (C) 1994 Aladdin Enterprises.  All rights reserved.
+  
+  This file is part of GNU Ghostscript.
+  
+  GNU Ghostscript is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility to
+  anyone for the consequences of using it or for whether it serves any
+  particular purpose or works at all, unless he says so in writing.  Refer to
+  the GNU General Public License for full details.
+  
+  Everyone is granted permission to copy, modify and redistribute GNU
+  Ghostscript, but only under the conditions described in the GNU General
+  Public License.  A copy of this license is supposed to have been given to
+  you along with GNU Ghostscript so you can know your rights and
+  responsibilities.  It should be in a file named COPYING.  Among other
+  things, the copyright notice and this notice must be preserved on all
+  copies.
+  
+  Aladdin Enterprises is not affiliated with the Free Software Foundation or
+  the GNU Project.  GNU Ghostscript, as distributed by Aladdin Enterprises,
+  does not depend on any other GNU software.
+*/
+
+/* shcgen.h */
+/* Interface to shcgen.c */
+/* Requires shc.h */
+
+/* Compute an optimal Huffman code from an input data set. */
+/* The client must have set all the elements of *def. */
+/* The definition is guaranteed to be well-behaved. */
+int hc_compute(P3(hc_definition *def, const long *freqs, gs_memory_t *mem));
+
+/* Convert a definition to a byte string. */
+/* The caller must provide the byte string, of length def->num_values. */
+/* Assume (do not check) that the definition is well-behaved. */
+/* Return the actual length of the string. */
+int hc_bytes_from_definition(P2(byte *dbytes, const hc_definition *def));
+
+/* Extract num_counts and num_values from a byte string. */
+void hc_sizes_from_bytes(P3(hc_definition *def, const byte *dbytes, int num_bytes));
+
+/* Convert a byte string back to a definition. */
+/* The caller must initialize *def, including allocating counts and values. */
+void hc_definition_from_bytes(P2(hc_definition *def, const byte *dbytes));
+
+/* Generate the encoding table from the definition. */
+/* The size of the encode array is def->num_values. */
+void hc_make_encoding(P2(hce_code *encode, const hc_definition *def));
+
+/* Calculate the size of the decoding table. */
+uint hc_sizeof_decoding(P2(const hc_definition *def, int initial_bits));
+
+/* Generate the decoding tables. */
+void hc_make_decoding(P3(hcd_code *decode, const hc_definition *def,
+  int initial_bits));