[pcsx_rearmed.git] / deps / libretro-common / include / libchdr / chd.h

/***************************************************************************

    chd.h

    MAME Compressed Hunks of Data file format

****************************************************************************

    Copyright Aaron Giles
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in
          the documentation and/or other materials provided with the
          distribution.
        * Neither the name 'MAME' nor the names of its contributors may be
          used to endorse or promote products derived from this software
          without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

***************************************************************************/

#pragma once

#ifndef __CHD_H__
#define __CHD_H__

#ifdef __cplusplus
extern "C" {
#endif

#include "coretypes.h"
#include <streams/file_stream.h>

/***************************************************************************

    Compressed Hunks of Data header format. All numbers are stored in
    Motorola (big-endian) byte ordering. The header is 76 (V1) or 80 (V2)
    bytes long.

    V1 header:

    [  0] char   tag[8];        // 'MComprHD'
    [  8] UINT32 length;        // length of header (including tag and length fields)
    [ 12] UINT32 version;       // drive format version
    [ 16] UINT32 flags;         // flags (see below)
    [ 20] UINT32 compression;   // compression type
    [ 24] UINT32 hunksize;      // 512-byte sectors per hunk
    [ 28] UINT32 totalhunks;    // total # of hunks represented
    [ 32] UINT32 cylinders;     // number of cylinders on hard disk
    [ 36] UINT32 heads;         // number of heads on hard disk
    [ 40] UINT32 sectors;       // number of sectors on hard disk
    [ 44] UINT8  md5[16];       // MD5 checksum of raw data
    [ 60] UINT8  parentmd5[16]; // MD5 checksum of parent file
    [ 76] (V1 header length)

    V2 header:

    [  0] char   tag[8];        // 'MComprHD'
    [  8] UINT32 length;        // length of header (including tag and length fields)
    [ 12] UINT32 version;       // drive format version
    [ 16] UINT32 flags;         // flags (see below)
    [ 20] UINT32 compression;   // compression type
    [ 24] UINT32 hunksize;      // seclen-byte sectors per hunk
    [ 28] UINT32 totalhunks;    // total # of hunks represented
    [ 32] UINT32 cylinders;     // number of cylinders on hard disk
    [ 36] UINT32 heads;         // number of heads on hard disk
    [ 40] UINT32 sectors;       // number of sectors on hard disk
    [ 44] UINT8  md5[16];       // MD5 checksum of raw data
    [ 60] UINT8  parentmd5[16]; // MD5 checksum of parent file
    [ 76] UINT32 seclen;        // number of bytes per sector
    [ 80] (V2 header length)

    V3 header:

    [  0] char   tag[8];        // 'MComprHD'
    [  8] UINT32 length;        // length of header (including tag and length fields)
    [ 12] UINT32 version;       // drive format version
    [ 16] UINT32 flags;         // flags (see below)
    [ 20] UINT32 compression;   // compression type
    [ 24] UINT32 totalhunks;    // total # of hunks represented
    [ 28] UINT64 logicalbytes;  // logical size of the data (in bytes)
    [ 36] UINT64 metaoffset;    // offset to the first blob of metadata
    [ 44] UINT8  md5[16];       // MD5 checksum of raw data
    [ 60] UINT8  parentmd5[16]; // MD5 checksum of parent file
    [ 76] UINT32 hunkbytes;     // number of bytes per hunk
    [ 80] UINT8  sha1[20];      // SHA1 checksum of raw data
    [100] UINT8  parentsha1[20];// SHA1 checksum of parent file
    [120] (V3 header length)

    V4 header:

    [  0] char   tag[8];        // 'MComprHD'
    [  8] UINT32 length;        // length of header (including tag and length fields)
    [ 12] UINT32 version;       // drive format version
    [ 16] UINT32 flags;         // flags (see below)
    [ 20] UINT32 compression;   // compression type
    [ 24] UINT32 totalhunks;    // total # of hunks represented
    [ 28] UINT64 logicalbytes;  // logical size of the data (in bytes)
    [ 36] UINT64 metaoffset;    // offset to the first blob of metadata
    [ 44] UINT32 hunkbytes;     // number of bytes per hunk
    [ 48] UINT8  sha1[20];      // combined raw+meta SHA1
    [ 68] UINT8  parentsha1[20];// combined raw+meta SHA1 of parent
    [ 88] UINT8  rawsha1[20];   // raw data SHA1
    [108] (V4 header length)

    Flags:
        0x00000001 - set if this drive has a parent
        0x00000002 - set if this drive allows writes

   =========================================================================

    V5 header:

    [  0] char   tag[8];        // 'MComprHD'
    [  8] uint32_t length;        // length of header (including tag and length fields)
    [ 12] uint32_t version;       // drive format version
    [ 16] uint32_t compressors[4];// which custom compressors are used?
    [ 32] uint64_t logicalbytes;  // logical size of the data (in bytes)
    [ 40] uint64_t mapoffset;     // offset to the map
    [ 48] uint64_t metaoffset;    // offset to the first blob of metadata
    [ 56] uint32_t hunkbytes;     // number of bytes per hunk (512k maximum)
    [ 60] uint32_t unitbytes;     // number of bytes per unit within each hunk
    [ 64] uint8_t  rawsha1[20];   // raw data SHA1
    [ 84] uint8_t  sha1[20];      // combined raw+meta SHA1
    [104] uint8_t  parentsha1[20];// combined raw+meta SHA1 of parent
    [124] (V5 header length)

    If parentsha1 != 0, we have a parent (no need for flags)
    If compressors[0] == 0, we are uncompressed (including maps)

    V5 uncompressed map format:

    [  0] uint32_t offset;        // starting offset / hunk size

    V5 compressed map format header:

    [  0] uint32_t length;        // length of compressed map
    [  4] UINT48 datastart;     // offset of first block
    [ 10] uint16_t crc;           // crc-16 of the map
    [ 12] uint8_t lengthbits;     // bits used to encode complength
    [ 13] uint8_t hunkbits;       // bits used to encode self-refs
    [ 14] uint8_t parentunitbits; // bits used to encode parent unit refs
    [ 15] uint8_t reserved;       // future use
    [ 16] (compressed header length)

    Each compressed map entry, once expanded, looks like:

    [  0] uint8_t compression;    // compression type
    [  1] UINT24 complength;    // compressed length
    [  4] UINT48 offset;        // offset
    [ 10] uint16_t crc;           // crc-16 of the data

***************************************************************************/

/***************************************************************************
    CONSTANTS
***************************************************************************/

/* header information */
#define CHD_HEADER_VERSION			5
#define CHD_V1_HEADER_SIZE			76
#define CHD_V2_HEADER_SIZE			80
#define CHD_V3_HEADER_SIZE			120
#define CHD_V4_HEADER_SIZE			108
#define CHD_V5_HEADER_SIZE          124

#define CHD_MAX_HEADER_SIZE			CHD_V5_HEADER_SIZE

/* checksumming information */
#define CHD_MD5_BYTES				16
#define CHD_SHA1_BYTES				20

/* CHD global flags */
#define CHDFLAGS_HAS_PARENT			0x00000001
#define CHDFLAGS_IS_WRITEABLE		0x00000002
#define CHDFLAGS_UNDEFINED			0xfffffffc

#define CHD_MAKE_TAG(a,b,c,d)       (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))

/* compression types */
#define CHDCOMPRESSION_NONE			0
#define CHDCOMPRESSION_ZLIB			1
#define CHDCOMPRESSION_ZLIB_PLUS	2
#define CHDCOMPRESSION_AV			3

#define CHD_CODEC_ZLIB				CHD_MAKE_TAG('z','l','i','b')

/* general codecs with CD frontend */
#define CHD_CODEC_CD_ZLIB CHD_MAKE_TAG('c','d','z','l')
#define CHD_CODEC_CD_LZMA CHD_MAKE_TAG('c','d','l','z')
#define CHD_CODEC_CD_FLAC CHD_MAKE_TAG('c','d','f','l')

/* A/V codec configuration parameters */
#define AV_CODEC_COMPRESS_CONFIG	1
#define AV_CODEC_DECOMPRESS_CONFIG	2

/* metadata parameters */
#define CHDMETATAG_WILDCARD			0
#define CHD_METAINDEX_APPEND		((UINT32)-1)

/* metadata flags */
#define CHD_MDFLAGS_CHECKSUM		0x01		/* indicates data is checksummed */

/* standard hard disk metadata */
#define HARD_DISK_METADATA_TAG		CHD_MAKE_TAG('G','D','D','D')
#define HARD_DISK_METADATA_FORMAT	"CYLS:%u,HEADS:%u,SECS:%u,BPS:%u"

/* hard disk identify information */
#define HARD_DISK_IDENT_METADATA_TAG CHD_MAKE_TAG('I','D','N','T')

/* hard disk key information */
#define HARD_DISK_KEY_METADATA_TAG	CHD_MAKE_TAG('K','E','Y',' ')

/* pcmcia CIS information */
#define PCMCIA_CIS_METADATA_TAG		CHD_MAKE_TAG('C','I','S',' ')

/* standard CD-ROM metadata */
#define CDROM_OLD_METADATA_TAG		CHD_MAKE_TAG('C','H','C','D')
#define CDROM_TRACK_METADATA_TAG	   CHD_MAKE_TAG('C','H','T','R')
#define CDROM_TRACK_METADATA_FORMAT	"TRACK:%u TYPE:%s SUBTYPE:%s FRAMES:%u"
#define CDROM_TRACK_METADATA2_TAG	CHD_MAKE_TAG('C','H','T','2')
#define CDROM_TRACK_METADATA2_FORMAT	"TRACK:%u TYPE:%s SUBTYPE:%s FRAMES:%u PREGAP:%u PGTYPE:%s PGSUB:%s POSTGAP:%u"
#define GDROM_OLD_METADATA_TAG		CHD_MAKE_TAG('C','H','G','T')
#define GDROM_TRACK_METADATA_TAG	CHD_MAKE_TAG('C', 'H', 'G', 'D')
#define GDROM_TRACK_METADATA_FORMAT	"TRACK:%u TYPE:%s SUBTYPE:%s FRAMES:%u PAD:%u PREGAP:%u PGTYPE:%s PGSUB:%s POSTGAP:%u"

/* standard A/V metadata */
#define AV_METADATA_TAG				CHD_MAKE_TAG('A','V','A','V')
#define AV_METADATA_FORMAT			"FPS:%d.%06d WIDTH:%d HEIGHT:%d INTERLACED:%d CHANNELS:%d SAMPLERATE:%d"

/* A/V laserdisc frame metadata */
#define AV_LD_METADATA_TAG			CHD_MAKE_TAG('A','V','L','D')

/* CHD open values */
#define CHD_OPEN_READ				1
#define CHD_OPEN_READWRITE			2

/* error types */
enum _chd_error
{
	CHDERR_NONE,
	CHDERR_NO_INTERFACE,
	CHDERR_OUT_OF_MEMORY,
	CHDERR_INVALID_FILE,
	CHDERR_INVALID_PARAMETER,
	CHDERR_INVALID_DATA,
	CHDERR_FILE_NOT_FOUND,
	CHDERR_REQUIRES_PARENT,
	CHDERR_FILE_NOT_WRITEABLE,
	CHDERR_READ_ERROR,
	CHDERR_WRITE_ERROR,
	CHDERR_CODEC_ERROR,
	CHDERR_INVALID_PARENT,
	CHDERR_HUNK_OUT_OF_RANGE,
	CHDERR_DECOMPRESSION_ERROR,
	CHDERR_COMPRESSION_ERROR,
	CHDERR_CANT_CREATE_FILE,
	CHDERR_CANT_VERIFY,
	CHDERR_NOT_SUPPORTED,
	CHDERR_METADATA_NOT_FOUND,
	CHDERR_INVALID_METADATA_SIZE,
	CHDERR_UNSUPPORTED_VERSION,
	CHDERR_VERIFY_INCOMPLETE,
	CHDERR_INVALID_METADATA,
	CHDERR_INVALID_STATE,
	CHDERR_OPERATION_PENDING,
	CHDERR_NO_ASYNC_OPERATION,
	CHDERR_UNSUPPORTED_FORMAT
};
typedef enum _chd_error chd_error;

/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

/* opaque types */
typedef struct _chd_file chd_file;

/* extract header structure (NOT the on-disk header structure) */
typedef struct _chd_header chd_header;
struct _chd_header
{
	UINT32		length;						/* length of header data */
	UINT32		version;					/* drive format version */
	UINT32		flags;						/* flags field */
	UINT32		compression[4];				/* compression type */
	UINT32		hunkbytes;					/* number of bytes per hunk */
	UINT32		totalhunks;					/* total # of hunks represented */
	UINT64		logicalbytes;				/* logical size of the data */
	UINT64		metaoffset;					/* offset in file of first metadata */
	UINT64		mapoffset;					/* TOOD V5 */
	UINT8		md5[CHD_MD5_BYTES];			/* overall MD5 checksum */
	UINT8		parentmd5[CHD_MD5_BYTES];	/* overall MD5 checksum of parent */
	UINT8		sha1[CHD_SHA1_BYTES];		/* overall SHA1 checksum */
	UINT8		rawsha1[CHD_SHA1_BYTES];	/* SHA1 checksum of raw data */
	UINT8		parentsha1[CHD_SHA1_BYTES];	/* overall SHA1 checksum of parent */
	UINT32		unitbytes;					/* TODO V5 */
	UINT64		unitcount;					/* TODO V5 */
    UINT32      hunkcount;                  /* TODO V5 */

    /* map information */
    UINT32      mapentrybytes;              /* length of each entry in a map (V5) */
    UINT8*      rawmap;                     /* raw map data */

	UINT32		obsolete_cylinders;			/* obsolete field -- do not use! */
	UINT32		obsolete_sectors;			/* obsolete field -- do not use! */
	UINT32		obsolete_heads;				/* obsolete field -- do not use! */
	UINT32		obsolete_hunksize;			/* obsolete field -- do not use! */
};

/* structure for returning information about a verification pass */
typedef struct _chd_verify_result chd_verify_result;
struct _chd_verify_result
{
	UINT8		md5[CHD_MD5_BYTES];			/* overall MD5 checksum */
	UINT8		sha1[CHD_SHA1_BYTES];		/* overall SHA1 checksum */
	UINT8		rawsha1[CHD_SHA1_BYTES];	/* SHA1 checksum of raw data */
	UINT8		metasha1[CHD_SHA1_BYTES];	/* SHA1 checksum of metadata */
};

/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/

/* ----- CHD file management ----- */

/* create a new CHD file fitting the given description */
/* chd_error chd_create(const char *filename, UINT64 logicalbytes, UINT32 hunkbytes, UINT32 compression, chd_file *parent); */

/* same as chd_create(), but accepts an already-opened core_file object */
/* chd_error chd_create_file(core_file *file, UINT64 logicalbytes, UINT32 hunkbytes, UINT32 compression, chd_file *parent); */

/* open an existing CHD file */
chd_error chd_open_file(RFILE *file, int mode, chd_file *parent, chd_file **chd);

chd_error chd_open(const char *filename, int mode, chd_file *parent, chd_file **chd);

/* precache underlying file */
chd_error chd_precache(chd_file *chd);

/* close a CHD file */
void chd_close(chd_file *chd);

/* return the associated core_file */
RFILE *chd_core_file(chd_file *chd);

/* return an error string for the given CHD error */
const char *chd_error_string(chd_error err);

/* ----- CHD header management ----- */

/* return a pointer to the extracted CHD header data */
const chd_header *chd_get_header(chd_file *chd);

/* ----- core data read/write ----- */

/* read one hunk from the CHD file */
chd_error chd_read(chd_file *chd, UINT32 hunknum, void *buffer);

/* ----- metadata management ----- */

/* get indexed metadata of a particular sort */
chd_error chd_get_metadata(chd_file *chd, UINT32 searchtag, UINT32 searchindex, void *output, UINT32 outputlen, UINT32 *resultlen, UINT32 *resulttag, UINT8 *resultflags);

/* ----- codec interfaces ----- */

/* set internal codec parameters */
chd_error chd_codec_config(chd_file *chd, int param, void *config);

/* return a string description of a codec */
const char *chd_get_codec_name(UINT32 codec);

extern const uint8_t s_cd_sync_header[12];

#ifdef __cplusplus
}
#endif

#endif /* __CHD_H__ */
Commit	Line	Data
3719602c PC	1	/***************************************************************************
	2
	3	chd.h
	4
	5	MAME Compressed Hunks of Data file format
	6
	7	****************************************************************************
	8
	9	Copyright Aaron Giles
	10	All rights reserved.
	11
	12	Redistribution and use in source and binary forms, with or without
	13	modification, are permitted provided that the following conditions are
	14	met:
	15
	16	* Redistributions of source code must retain the above copyright
	17	notice, this list of conditions and the following disclaimer.
	18	* Redistributions in binary form must reproduce the above copyright
	19	notice, this list of conditions and the following disclaimer in
	20	the documentation and/or other materials provided with the
	21	distribution.
	22	* Neither the name 'MAME' nor the names of its contributors may be
	23	used to endorse or promote products derived from this software
	24	without specific prior written permission.
	25
	26	THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
	27	IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	28	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	29	DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
	30	INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	31	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	32	SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	33	HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	34	STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	35	IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	36	POSSIBILITY OF SUCH DAMAGE.
	37
	38	***************************************************************************/
	39
	40	#pragma once
	41
	42	#ifndef __CHD_H__
	43	#define __CHD_H__
	44
	45	#ifdef __cplusplus
	46	extern "C" {
	47	#endif
	48
	49	#include "coretypes.h"
	50	#include <streams/file_stream.h>
	51
	52	/***************************************************************************
	53
	54	Compressed Hunks of Data header format. All numbers are stored in
	55	Motorola (big-endian) byte ordering. The header is 76 (V1) or 80 (V2)
	56	bytes long.
	57
	58	V1 header:
	59
	60	[ 0] char tag[8]; // 'MComprHD'
	61	[ 8] UINT32 length; // length of header (including tag and length fields)
	62	[ 12] UINT32 version; // drive format version
	63	[ 16] UINT32 flags; // flags (see below)
	64	[ 20] UINT32 compression; // compression type
65	[ 24] UINT32 hunksize; // 512-byte sectors per hunk
66	[ 28] UINT32 totalhunks; // total # of hunks represented
67	[ 32] UINT32 cylinders; // number of cylinders on hard disk
68	[ 36] UINT32 heads; // number of heads on hard disk
69	[ 40] UINT32 sectors; // number of sectors on hard disk
70	[ 44] UINT8 md5[16]; // MD5 checksum of raw data
71	[ 60] UINT8 parentmd5[16]; // MD5 checksum of parent file
72	[ 76] (V1 header length)
73
74	V2 header:
75
76	[ 0] char tag[8]; // 'MComprHD'
77	[ 8] UINT32 length; // length of header (including tag and length fields)
78	[ 12] UINT32 version; // drive format version
79	[ 16] UINT32 flags; // flags (see below)
80	[ 20] UINT32 compression; // compression type
81	[ 24] UINT32 hunksize; // seclen-byte sectors per hunk
82	[ 28] UINT32 totalhunks; // total # of hunks represented
83	[ 32] UINT32 cylinders; // number of cylinders on hard disk
84	[ 36] UINT32 heads; // number of heads on hard disk
85	[ 40] UINT32 sectors; // number of sectors on hard disk
86	[ 44] UINT8 md5[16]; // MD5 checksum of raw data
87	[ 60] UINT8 parentmd5[16]; // MD5 checksum of parent file
88	[ 76] UINT32 seclen; // number of bytes per sector
89	[ 80] (V2 header length)
90
91	V3 header:
92
93	[ 0] char tag[8]; // 'MComprHD'
94	[ 8] UINT32 length; // length of header (including tag and length fields)
95	[ 12] UINT32 version; // drive format version
96	[ 16] UINT32 flags; // flags (see below)
97	[ 20] UINT32 compression; // compression type
98	[ 24] UINT32 totalhunks; // total # of hunks represented
99	[ 28] UINT64 logicalbytes; // logical size of the data (in bytes)
100	[ 36] UINT64 metaoffset; // offset to the first blob of metadata
101	[ 44] UINT8 md5[16]; // MD5 checksum of raw data
102	[ 60] UINT8 parentmd5[16]; // MD5 checksum of parent file
103	[ 76] UINT32 hunkbytes; // number of bytes per hunk
104	[ 80] UINT8 sha1[20]; // SHA1 checksum of raw data
105	[100] UINT8 parentsha1[20];// SHA1 checksum of parent file
106	[120] (V3 header length)
107
108	V4 header:
109
110	[ 0] char tag[8]; // 'MComprHD'
111	[ 8] UINT32 length; // length of header (including tag and length fields)
112	[ 12] UINT32 version; // drive format version
113	[ 16] UINT32 flags; // flags (see below)
114	[ 20] UINT32 compression; // compression type
115	[ 24] UINT32 totalhunks; // total # of hunks represented
116	[ 28] UINT64 logicalbytes; // logical size of the data (in bytes)
117	[ 36] UINT64 metaoffset; // offset to the first blob of metadata
118	[ 44] UINT32 hunkbytes; // number of bytes per hunk
119	[ 48] UINT8 sha1[20]; // combined raw+meta SHA1
120	[ 68] UINT8 parentsha1[20];// combined raw+meta SHA1 of parent
121	[ 88] UINT8 rawsha1[20]; // raw data SHA1
122	[108] (V4 header length)
123
124	Flags:
125	0x00000001 - set if this drive has a parent
126	0x00000002 - set if this drive allows writes
127
128	=========================================================================
129
130	V5 header:
131
132	[ 0] char tag[8]; // 'MComprHD'
133	[ 8] uint32_t length; // length of header (including tag and length fields)
134	[ 12] uint32_t version; // drive format version
135	[ 16] uint32_t compressors[4];// which custom compressors are used?
136	[ 32] uint64_t logicalbytes; // logical size of the data (in bytes)
137	[ 40] uint64_t mapoffset; // offset to the map
138	[ 48] uint64_t metaoffset; // offset to the first blob of metadata
139	[ 56] uint32_t hunkbytes; // number of bytes per hunk (512k maximum)
140	[ 60] uint32_t unitbytes; // number of bytes per unit within each hunk
141	[ 64] uint8_t rawsha1[20]; // raw data SHA1
142	[ 84] uint8_t sha1[20]; // combined raw+meta SHA1
143	[104] uint8_t parentsha1[20];// combined raw+meta SHA1 of parent
144	[124] (V5 header length)
145
146	If parentsha1 != 0, we have a parent (no need for flags)
147	If compressors[0] == 0, we are uncompressed (including maps)
148
149	V5 uncompressed map format:
150
151	[ 0] uint32_t offset; // starting offset / hunk size
152
153	V5 compressed map format header:
154
155	[ 0] uint32_t length; // length of compressed map
156	[ 4] UINT48 datastart; // offset of first block
157	[ 10] uint16_t crc; // crc-16 of the map
158	[ 12] uint8_t lengthbits; // bits used to encode complength
159	[ 13] uint8_t hunkbits; // bits used to encode self-refs
160	[ 14] uint8_t parentunitbits; // bits used to encode parent unit refs
161	[ 15] uint8_t reserved; // future use
162	[ 16] (compressed header length)
163
164	Each compressed map entry, once expanded, looks like:
165
166	[ 0] uint8_t compression; // compression type
167	[ 1] UINT24 complength; // compressed length
168	[ 4] UINT48 offset; // offset
169	[ 10] uint16_t crc; // crc-16 of the data
170
171	***************************************************************************/
172
173	/***************************************************************************
174	CONSTANTS
175	***************************************************************************/
176
177	/* header information */
178	#define CHD_HEADER_VERSION 5
179	#define CHD_V1_HEADER_SIZE 76
180	#define CHD_V2_HEADER_SIZE 80
181	#define CHD_V3_HEADER_SIZE 120
182	#define CHD_V4_HEADER_SIZE 108
183	#define CHD_V5_HEADER_SIZE 124
184
185	#define CHD_MAX_HEADER_SIZE CHD_V5_HEADER_SIZE
186
187	/* checksumming information */
188	#define CHD_MD5_BYTES 16
189	#define CHD_SHA1_BYTES 20
190
191	/* CHD global flags */
192	#define CHDFLAGS_HAS_PARENT 0x00000001
193	#define CHDFLAGS_IS_WRITEABLE 0x00000002
194	#define CHDFLAGS_UNDEFINED 0xfffffffc
195
196	#define CHD_MAKE_TAG(a,b,c,d) (((a) << 24) \| ((b) << 16) \| ((c) << 8) \| (d))
197
198	/* compression types */
199	#define CHDCOMPRESSION_NONE 0
200	#define CHDCOMPRESSION_ZLIB 1
201	#define CHDCOMPRESSION_ZLIB_PLUS 2
202	#define CHDCOMPRESSION_AV 3
203
204	#define CHD_CODEC_ZLIB CHD_MAKE_TAG('z','l','i','b')
205
206	/* general codecs with CD frontend */
207	#define CHD_CODEC_CD_ZLIB CHD_MAKE_TAG('c','d','z','l')
208	#define CHD_CODEC_CD_LZMA CHD_MAKE_TAG('c','d','l','z')
209	#define CHD_CODEC_CD_FLAC CHD_MAKE_TAG('c','d','f','l')
210
211	/* A/V codec configuration parameters */
212	#define AV_CODEC_COMPRESS_CONFIG 1
213	#define AV_CODEC_DECOMPRESS_CONFIG 2
214
215	/* metadata parameters */
216	#define CHDMETATAG_WILDCARD 0
217	#define CHD_METAINDEX_APPEND ((UINT32)-1)
218
219	/* metadata flags */
220	#define CHD_MDFLAGS_CHECKSUM 0x01 /* indicates data is checksummed */
221
222	/* standard hard disk metadata */
223	#define HARD_DISK_METADATA_TAG CHD_MAKE_TAG('G','D','D','D')
224	#define HARD_DISK_METADATA_FORMAT "CYLS:%u,HEADS:%u,SECS:%u,BPS:%u"
225
226	/* hard disk identify information */
227	#define HARD_DISK_IDENT_METADATA_TAG CHD_MAKE_TAG('I','D','N','T')
228
229	/* hard disk key information */
230	#define HARD_DISK_KEY_METADATA_TAG CHD_MAKE_TAG('K','E','Y',' ')
231
232	/* pcmcia CIS information */
233	#define PCMCIA_CIS_METADATA_TAG CHD_MAKE_TAG('C','I','S',' ')
234
235	/* standard CD-ROM metadata */
236	#define CDROM_OLD_METADATA_TAG CHD_MAKE_TAG('C','H','C','D')
237	#define CDROM_TRACK_METADATA_TAG CHD_MAKE_TAG('C','H','T','R')
238	#define CDROM_TRACK_METADATA_FORMAT "TRACK:%u TYPE:%s SUBTYPE:%s FRAMES:%u"
239	#define CDROM_TRACK_METADATA2_TAG CHD_MAKE_TAG('C','H','T','2')
240	#define CDROM_TRACK_METADATA2_FORMAT "TRACK:%u TYPE:%s SUBTYPE:%s FRAMES:%u PREGAP:%u PGTYPE:%s PGSUB:%s POSTGAP:%u"
241	#define GDROM_OLD_METADATA_TAG CHD_MAKE_TAG('C','H','G','T')
242	#define GDROM_TRACK_METADATA_TAG CHD_MAKE_TAG('C', 'H', 'G', 'D')
243	#define GDROM_TRACK_METADATA_FORMAT "TRACK:%u TYPE:%s SUBTYPE:%s FRAMES:%u PAD:%u PREGAP:%u PGTYPE:%s PGSUB:%s POSTGAP:%u"
244
245	/* standard A/V metadata */
246	#define AV_METADATA_TAG CHD_MAKE_TAG('A','V','A','V')
247	#define AV_METADATA_FORMAT "FPS:%d.%06d WIDTH:%d HEIGHT:%d INTERLACED:%d CHANNELS:%d SAMPLERATE:%d"
248
249	/* A/V laserdisc frame metadata */
250	#define AV_LD_METADATA_TAG CHD_MAKE_TAG('A','V','L','D')
251
252	/* CHD open values */
253	#define CHD_OPEN_READ 1
254	#define CHD_OPEN_READWRITE 2
255
256	/* error types */
257	enum _chd_error
258	{
259	CHDERR_NONE,
260	CHDERR_NO_INTERFACE,
261	CHDERR_OUT_OF_MEMORY,
262	CHDERR_INVALID_FILE,
263	CHDERR_INVALID_PARAMETER,
264	CHDERR_INVALID_DATA,
265	CHDERR_FILE_NOT_FOUND,
266	CHDERR_REQUIRES_PARENT,
267	CHDERR_FILE_NOT_WRITEABLE,
268	CHDERR_READ_ERROR,
269	CHDERR_WRITE_ERROR,
270	CHDERR_CODEC_ERROR,
271	CHDERR_INVALID_PARENT,
272	CHDERR_HUNK_OUT_OF_RANGE,
273	CHDERR_DECOMPRESSION_ERROR,
274	CHDERR_COMPRESSION_ERROR,
275	CHDERR_CANT_CREATE_FILE,
276	CHDERR_CANT_VERIFY,
277	CHDERR_NOT_SUPPORTED,
278	CHDERR_METADATA_NOT_FOUND,
279	CHDERR_INVALID_METADATA_SIZE,
280	CHDERR_UNSUPPORTED_VERSION,
281	CHDERR_VERIFY_INCOMPLETE,
282	CHDERR_INVALID_METADATA,
283	CHDERR_INVALID_STATE,
284	CHDERR_OPERATION_PENDING,
285	CHDERR_NO_ASYNC_OPERATION,
286	CHDERR_UNSUPPORTED_FORMAT
287	};
288	typedef enum _chd_error chd_error;
289
290	/***************************************************************************
291	TYPE DEFINITIONS
292	***************************************************************************/
293
294	/* opaque types */
295	typedef struct _chd_file chd_file;
296
297	/* extract header structure (NOT the on-disk header structure) */
298	typedef struct _chd_header chd_header;
299	struct _chd_header
300	{
301	UINT32 length; /* length of header data */
302	UINT32 version; /* drive format version */
303	UINT32 flags; /* flags field */
304	UINT32 compression[4]; /* compression type */
305	UINT32 hunkbytes; /* number of bytes per hunk */
306	UINT32 totalhunks; /* total # of hunks represented */
307	UINT64 logicalbytes; /* logical size of the data */
308	UINT64 metaoffset; /* offset in file of first metadata */
309	UINT64 mapoffset; /* TOOD V5 */
310	UINT8 md5[CHD_MD5_BYTES]; /* overall MD5 checksum */
311	UINT8 parentmd5[CHD_MD5_BYTES]; /* overall MD5 checksum of parent */
312	UINT8 sha1[CHD_SHA1_BYTES]; /* overall SHA1 checksum */
313	UINT8 rawsha1[CHD_SHA1_BYTES]; /* SHA1 checksum of raw data */
314	UINT8 parentsha1[CHD_SHA1_BYTES]; /* overall SHA1 checksum of parent */
315	UINT32 unitbytes; /* TODO V5 */
316	UINT64 unitcount; /* TODO V5 */
317	UINT32 hunkcount; /* TODO V5 */
318
319	/* map information */
320	UINT32 mapentrybytes; /* length of each entry in a map (V5) */
321	UINT8* rawmap; /* raw map data */
322
323	UINT32 obsolete_cylinders; /* obsolete field -- do not use! */
324	UINT32 obsolete_sectors; /* obsolete field -- do not use! */
325	UINT32 obsolete_heads; /* obsolete field -- do not use! */
326	UINT32 obsolete_hunksize; /* obsolete field -- do not use! */
327	};
328
329	/* structure for returning information about a verification pass */
330	typedef struct _chd_verify_result chd_verify_result;
331	struct _chd_verify_result
332	{
333	UINT8 md5[CHD_MD5_BYTES]; /* overall MD5 checksum */
334	UINT8 sha1[CHD_SHA1_BYTES]; /* overall SHA1 checksum */
335	UINT8 rawsha1[CHD_SHA1_BYTES]; /* SHA1 checksum of raw data */
336	UINT8 metasha1[CHD_SHA1_BYTES]; /* SHA1 checksum of metadata */
337	};
338
339	/***************************************************************************
340	FUNCTION PROTOTYPES
341	***************************************************************************/
342
343	/* ----- CHD file management ----- */
344
345	/* create a new CHD file fitting the given description */
346	/* chd_error chd_create(const char filename, UINT64 logicalbytes, UINT32 hunkbytes, UINT32 compression, chd_file parent); */
347
348	/* same as chd_create(), but accepts an already-opened core_file object */
349	/* chd_error chd_create_file(core_file file, UINT64 logicalbytes, UINT32 hunkbytes, UINT32 compression, chd_file parent); */
350
351	/* open an existing CHD file */
352	chd_error chd_open_file(RFILE file, int mode, chd_file parent, chd_file **chd);
353
354	chd_error chd_open(const char filename, int mode, chd_file parent, chd_file **chd);
355
356	/* precache underlying file */
357	chd_error chd_precache(chd_file *chd);
358
359	/* close a CHD file */
360	void chd_close(chd_file *chd);
361
362	/* return the associated core_file */
363	RFILE chd_core_file(chd_file chd);
364
365	/* return an error string for the given CHD error */
366	const char *chd_error_string(chd_error err);
367
368	/* ----- CHD header management ----- */
369
370	/* return a pointer to the extracted CHD header data */
371	const chd_header chd_get_header(chd_file chd);
372
373	/* ----- core data read/write ----- */
374
375	/* read one hunk from the CHD file */
376	chd_error chd_read(chd_file chd, UINT32 hunknum, void buffer);
377
378	/* ----- metadata management ----- */
379
380	/* get indexed metadata of a particular sort */
381	chd_error chd_get_metadata(chd_file chd, UINT32 searchtag, UINT32 searchindex, void output, UINT32 outputlen, UINT32 resultlen, UINT32 resulttag, UINT8 *resultflags);
382
383	/* ----- codec interfaces ----- */
384
385	/* set internal codec parameters */
386	chd_error chd_codec_config(chd_file chd, int param, void config);
387
388	/* return a string description of a codec */
389	const char *chd_get_codec_name(UINT32 codec);
390
391	extern const uint8_t s_cd_sync_header[12];
392
393	#ifdef __cplusplus
394	}
395	#endif
396
397	#endif /* __CHD_H__ */