From 7f6002caba3f0a6749820c2772161caf55b8d267 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Fri, 7 May 2021 20:00:12 +0000
Subject: Initial commit (uqm-0.8.0)

---
 src/libs/decomp/lzh.h | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 src/libs/decomp/lzh.h

(limited to 'src/libs/decomp/lzh.h')

diff --git a/src/libs/decomp/lzh.h b/src/libs/decomp/lzh.h
new file mode 100644
index 0000000..8ebdef4
--- /dev/null
+++ b/src/libs/decomp/lzh.h
@@ -0,0 +1,91 @@
+//Copyright Paul Reiche, Fred Ford. 1992-2002
+
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef LIBS_DECOMP_LZH_H_
+#define LIBS_DECOMP_LZH_H_
+
+#include "libs/declib.h"
+#include "libs/memlib.h"
+
+/* LZSS Parameters */
+
+#define N 4096 /* Size of string buffer */
+#define F 16 /* Size of look-ahead buffer */
+//#define F 60 /* Size of look-ahead buffer */
+#define THRESHOLD 2
+#define NIL N /* End of tree's node  */
+
+/* Huffman coding parameters */
+
+#define N_CHAR   (256 - THRESHOLD + F)
+								/* character code (= 0..N_CHAR-1) */
+#define T  (N_CHAR * 2 - 1) /* Size of table */
+#define R  (T - 1) /* root position */
+#define MAX_FREQ 0x8000
+										/* update when cumulative frequency */
+
+struct _LZHCODE_DESC
+{
+	COUNT buf_index, restart_index, bytes_left;
+	BYTE text_buf[N + F - 1];
+		/* reconstruct freq tree */
+	COUNT freq[T + 1]; /* cumulative freq table */
+		/*
+		 * pointing parent nodes.
+		 * area [T..(T + N_CHAR - 1)] are pointers for leaves
+		 */
+	COUNT prnt[T + N_CHAR];
+		/* pointing children nodes (son[], son[] + 1)*/
+	COUNT son[T];
+	UWORD workbuf;
+	BYTE workbuflen;
+
+	STREAM_TYPE StreamType;
+
+	void *Stream;
+	DWORD StreamIndex, StreamLength;
+
+	STREAM_MODE StreamMode;
+	PVOIDFUNC CleanupFunc;
+};
+
+typedef struct _LZHCODE_DESC LZHCODE_DESC;
+typedef LZHCODE_DESC *PLZHCODE_DESC;
+
+#define InChar() (_StreamType == FILE_STREAM ? \
+								GetResFileChar ((uio_Stream *)_Stream) : \
+								(int)*_Stream++)
+#define OutChar(c) (_StreamType == FILE_STREAM ? \
+								PutResFileChar ((c), (uio_Stream *)_Stream) : \
+								(*_Stream++ = (BYTE)(c)))
+
+
+#define AllocCodeDesc() HCalloc (sizeof (LZHCODE_DESC))
+#define FreeCodeDesc HFree
+
+extern void _update (COUNT c);
+extern void StartHuff (void);
+
+extern PLZHCODE_DESC  _lpCurCodeDesc;
+extern STREAM_TYPE    _StreamType;
+extern BYTE*          _Stream;
+extern UWORD          _workbuf;
+extern BYTE           _workbuflen;
+
+#endif /* LIBS_DECOMP_LZH_H_ */
+
-- 
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