Initial community commit

Src/external_dependencies/openmpt-trunk/include/lhasa/lib/lh5_decoder.c

@@ -0,0 +1,49 @@
+/*
+
+Copyright (c) 2011, 2012, Simon Howard
+
+Permission to use, copy, modify, and/or distribute this software
+for any purpose with or without fee is hereby granted, provided
+that the above copyright notice and this permission notice appear
+in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ */
+
+//
+// Decoder for the -lh5- algorithm.
+//
+// This is the "new" algorithm that appeared in LHA v2, replacing
+// the older -lh1-. -lh4- seems to be identical to -lh5-.
+//
+
+// 16 KiB history ring buffer:
+
+#define HISTORY_BITS    14   /* 2^14 = 16384 */
+
+// Number of bits to encode HISTORY_BITS:
+
+#define OFFSET_BITS     4
+
+// Name of the variable for the encoder:
+
+#define DECODER_NAME lha_lh5_decoder
+
+// Generate a second decoder for lh4 that just has a different
+// block size.
+
+#define DECODER2_NAME lha_lh4_decoder
+
+// The actual algorithm code is contained in lh_new_decoder.c, which
+// acts as a template for -lh4-, -lh5-, -lh6- and -lh7-.
+
+#include "lh_new_decoder.c"
+