$NetBSD: patch-ag,v 1.3 2006/04/28 13:09:38 joerg Exp $

--- src/gens/util/chd.h.orig	2006-04-28 12:32:01.000000000 +0000
+++ src/gens/util/chd.h
@@ -0,0 +1,95 @@
+#ifndef HAD_CHD_H
+
+/*
+  NiH: chd.h,v 1.3 2004/06/25 23:31:08 dillo Exp
+
+  chd.h -- accessing chd files
+  Copyright (C) 2004 Dieter Baron and Thomas Klausner
+
+  This file is part of ckmame, a program to check rom sets for MAME.
+  The authors can be contacted at <nih@giga.or.at>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License, version 2, as
+  published by the Free Software Foundation.
+
+  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <zlib.h>
+
+#define CHD_ERR_NONE	0	/* N no error */
+#define CHD_ERR_OPEN	1	/* S cannot open file */
+#define CHD_ERR_READ	2	/* S read error */
+#define CHD_ERR_NO_CHD	3	/* N not a CHD file */
+#define CHD_ERR_VERSION	4	/* N unsupported version */
+#define CHD_ERR_INVAL	5	/* N invalid argument */
+#define CHD_ERR_SEEK	6	/* S seek error */
+#define CHD_ERR_NOTSUP	7	/* N unsupported chd feature */
+#define CHD_ERR_ZLIB	8	/* Z zlib error */
+#define CHD_ERR_CRC	9	/* N CRC mismatch */
+#define CHD_ERR_NOMEM	10	/* N out of memory */
+
+#define CHD_MAP_TYPE_COMPRESSED		0x01
+#define CHD_MAP_TYPE_UNCOMPRESSED	0x02
+#define CHD_MAP_TYPE_MINI		0x03
+#define CHD_MAP_TYPE_SELF_HUNK		0x04
+#define CHD_MAP_TYPE_PARENT_HUNK	0x05
+#define CHD_MAP_TYPE_MASK		0x0f
+#define CHD_MAP_FL_NOCRC		0x10
+
+#define CHD_COMP_NONE			0x0
+#define CHD_COMP_ZLIB			0x1
+#define CHD_COMP_ZLIB_PLUS		0x2
+
+
+
+struct chd_map_entry {
+    uint64_t offset;	/* offse t within the file of the data */
+    uint32_t crc;	/* 32-bit CRC of the data */
+    uint16_t length;	/* length of the data */
+    uint16_t flags;	/* misc flags */
+};
+
+struct chd {
+    FILE *f;
+    char *name;
+    int error;
+
+    uint32_t hdr_length;	/* length of header data */
+    uint32_t version;		/* drive format version */
+    uint32_t flags;		/* flags field */
+    uint32_t compression;	/* compression type */
+    uint32_t hunk_len;		/* number of bytes per hunk */
+    uint32_t total_hunks;	/* total # of hunks represented */
+    uint64_t total_len;		/* logical size of the data */
+    uint64_t meta_offset;	/* offset in file of first metadata */
+    uint8_t md5[16];		/* MD5 checksum of raw data */
+    uint8_t parent_md5[16];	/* MD5 checksum of parent file */
+    uint8_t sha1[20];           /* SHA1 checksum of raw data */
+    uint8_t parent_sha1[20];	/* SHA1 checksum of parent file */
+
+    struct chd_map_entry *map;	/* hunk map */
+    char *buf;			/* decompression buffer */
+    z_stream z;			/* decompressor */
+    int hno;			/* hunk currently in hbuf */
+    char *hbuf;			/* hunk data buffer */
+};
+
+
+
+void chd_close(struct chd *);
+struct chd *chd_open(const char *, int *);
+int chd_read_hunk(struct chd *, int, char *);
+int chd_read_range(struct chd *, char *, int, int);
+
+#endif /* chd.h */