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+/* packhead.h: Header definition of compressed data
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+
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+ Copyright (C) 2000 Thomas Nussbaumer
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+ Copyright (C) 2007 Kevin Kofler
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2, or (at your option)
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+ any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program; if not, write to the Free Software Foundation,
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+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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+
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+#ifndef PACKHEAD_H
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+#define PACKHEAD_H
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+
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+
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+#define MAGIC_CHAR1 'T'
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+#define MAGIC_CHAR2 'P'
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+
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+#define MAX_RLE_ENTRIES 31
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+
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+// size = 16 bytes
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+typedef struct {
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+ unsigned char origsize_lo; // original size lowbyte
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+ unsigned char origsize_hi; // original size highbyte
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+ unsigned char magic1; // must be equal to MAGIC_CHAR1
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+ unsigned char magic2; // must be equal to MAGIC_CHAR2
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+ unsigned char compsize_lo; // compressed size lowbyte
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+ unsigned char compsize_hi; // compressed size lowbyte
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+ unsigned char esc1; // escape >> (8-escBits)
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+ unsigned char notused3;
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+ unsigned char notused4;
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+ unsigned char esc2; // escBits
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+ unsigned char gamma1; // maxGamma + 1
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+ unsigned char gamma2; // (1<<maxGamma)
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+ unsigned char extralz; // extraLZPosBits
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+ unsigned char notused1;
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+ unsigned char notused2;
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+ unsigned char rleentries; // rleUsed
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+} PackedHeader;
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+
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+
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+#define GetUnPackedSize(p) (unsigned int)((p)->origsize_lo | ((p)->origsize_hi << 8))
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+#define IsPacked(p) ((p)->magic1 == MAGIC_CHAR1 && (p)->magic2 == MAGIC_CHAR2)
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+
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+
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+typedef struct {
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+ unsigned char value[MAX_RLE_ENTRIES];
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+} RLEEntries;
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+
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+
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+#endif
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