[pcsx_rearmed.git] / plugins / cdrcimg / cdrcimg.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2010
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <zlib.h>
#include <bzlib.h>
#include <dlfcn.h>

#include "cdrcimg.h"

#define PFX "cdrcimg: "
#define err(f, ...) fprintf(stderr, PFX f, ##__VA_ARGS__)

#define CD_FRAMESIZE_RAW 2352

enum {
	CDRC_ZLIB,
	CDRC_ZLIB2,
	CDRC_BZ,
};

static const char *cd_fname;
static unsigned int *cd_index_table;
static unsigned int  cd_index_len;
static unsigned int  cd_sectors_per_blk;
static int cd_compression;
static FILE *cd_file;

static int (*pBZ2_bzBuffToBuffDecompress)(char *dest, unsigned int *destLen, char *source,
		unsigned int sourceLen, int small, int verbosity);

static struct {
	unsigned char raw[16][CD_FRAMESIZE_RAW];
	unsigned char compressed[CD_FRAMESIZE_RAW * 16 + 100];
} *cdbuffer;
static int current_block, current_sect_in_blk;

struct CdrStat;
extern long CDR__getStatus(struct CdrStat *stat);

struct CdrStat
{
	unsigned int Type;
	unsigned int Status;
	unsigned char Time[3]; // current playing time
};

struct trackinfo {
	enum {DATA, CDDA} type;
	char start[3];		// MSF-format
	char length[3];		// MSF-format
};

#define MAXTRACKS 100 /* How many tracks can a CD hold? */

static int numtracks = 0;

#define btoi(b)           ((b) / 16 * 10 + (b) % 16) /* BCD to u_char */
#define MSF2SECT(m, s, f) (((m) * 60 + (s) - 2) * 75 + (f))

// return Starting and Ending Track
// buffer:
//  byte 0 - start track
//  byte 1 - end track
static long CDRgetTN(unsigned char *buffer)
{
	buffer[0] = 1;
	buffer[1] = numtracks > 0 ? numtracks : 1;

	return 0;
}

// return Track Time
// buffer:
//  byte 0 - frame
//  byte 1 - second
//  byte 2 - minute
static long CDRgetTD(unsigned char track, unsigned char *buffer)
{
	buffer[2] = 0;
	buffer[1] = 2;
	buffer[0] = 0;

	return 0;
}

int uncompress2(void *out, unsigned long *out_size, void *in, unsigned long in_size)
{
	static z_stream z;
	int ret = 0;

	if (z.zalloc == NULL) {
		// XXX: one-time leak here..
		z.next_in = Z_NULL;
		z.avail_in = 0;
		z.zalloc = Z_NULL;
		z.zfree = Z_NULL;
		z.opaque = Z_NULL;
		ret = inflateInit2(&z, -15);
	}
	else
		ret = inflateReset(&z);
	if (ret != Z_OK)
		return ret;

	z.next_in = in;
	z.avail_in = in_size;
	z.next_out = out;
	z.avail_out = *out_size;

	ret = inflate(&z, Z_NO_FLUSH);
	//inflateEnd(&z);

	*out_size -= z.avail_out;
	return ret == 1 ? 0 : ret;
}

// read track
// time: byte 0 - minute; byte 1 - second; byte 2 - frame
// uses bcd format
static long CDRreadTrack(unsigned char *time)
{
	unsigned int start_byte, size;
	unsigned long cdbuffer_size;
	int ret, sector, block;

	if (cd_file == NULL)
		return -1;

	sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));

	// avoid division if possible
	switch (cd_sectors_per_blk) {
	case 1:
		block = sector;
		current_sect_in_blk = 0;
		break;
	case 10:
		block = sector / 10;
		current_sect_in_blk = sector % 10;
		break;
	case 16:
		block = sector >> 4;
		current_sect_in_blk = sector & 15;
		break;
	default:
		err("unhandled cd_sectors_per_blk: %d\n", cd_sectors_per_blk);
		return -1;
	}

	if (block == current_block) {
		// it's already there, nothing to do
		//printf("hit sect %d\n", sector);
		return 0;
	}

	if (sector >= cd_index_len * cd_sectors_per_blk) {
		err("sector %d is past track end\n", sector);
		return -1;
	}

	start_byte = cd_index_table[block];
	if (fseek(cd_file, start_byte, SEEK_SET) != 0) {
		err("seek error for block %d at %x: ",
			block, start_byte);
		perror(NULL);
		return -1;
	}

	size = cd_index_table[block + 1] - start_byte;
	if (size > sizeof(cdbuffer->compressed)) {
		err("block %d is too large: %u\n", block, size);
		return -1;
	}

	if (fread(cdbuffer->compressed, 1, size, cd_file) != size) {
		err("read error for block %d at %x: ", block, start_byte);
		perror(NULL);
		return -1;
	}

	cdbuffer_size = sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk;
	switch (cd_compression) {
	case CDRC_ZLIB:
		ret = uncompress(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
		break;
	case CDRC_ZLIB2:
		ret = uncompress2(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
		break;
	case CDRC_BZ:
		ret = pBZ2_bzBuffToBuffDecompress((char *)cdbuffer->raw, (unsigned int *)&cdbuffer_size,
			(char *)cdbuffer->compressed, size, 0, 0);
		break;
	default:
		err("bad cd_compression: %d\n", cd_compression);
		return -1;
	}

	if (ret != 0) {
		err("uncompress failed with %d for block %d, sector %d\n",
			ret, block, sector);
		return -1;
	}
	if (cdbuffer_size != sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk)
		err("cdbuffer_size: %lu != %d, sector %d\n", cdbuffer_size,
			(int)sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk, sector);

	// done at last!
	current_block = block;
	return 0;
}

// return read track
static unsigned char *CDRgetBuffer(void)
{
	return cdbuffer->raw[current_sect_in_blk] + 12;
}

// plays cdda audio
// sector: byte 0 - minute; byte 1 - second; byte 2 - frame
// does NOT uses bcd format
static long CDRplay(unsigned char *time)
{
	return 0;
}

// stops cdda audio
static long CDRstop(void)
{
	return 0;
}

// gets subchannel data
static unsigned char* CDRgetBufferSub(void)
{
	return NULL;
}

static long CDRgetStatus(struct CdrStat *stat) {
	CDR__getStatus(stat);

	stat->Type = 0x01;

	return 0;
}

static long CDRclose(void)
{
	if (cd_file != NULL) {
		fclose(cd_file);
		cd_file = NULL;
	}
	if (cd_index_table != NULL) {
		free(cd_index_table);
		cd_index_table = NULL;
	}
	return 0;
}

static long CDRshutdown(void)
{
	return CDRclose();
}

static long CDRinit(void)
{
	if (cdbuffer == NULL) {
		cdbuffer = malloc(sizeof(*cdbuffer));
		if (cdbuffer == NULL) {
			err("OOM\n");
			return -1;
		}
	}
	if (pBZ2_bzBuffToBuffDecompress == NULL) {
		void *h = dlopen("/usr/lib/libbz2.so.1", RTLD_LAZY);
		if (h == NULL)
			h = dlopen("./lib/libbz2.so.1", RTLD_LAZY);
		if (h != NULL) {
			pBZ2_bzBuffToBuffDecompress = dlsym(h, "BZ2_bzBuffToBuffDecompress");
			if (pBZ2_bzBuffToBuffDecompress == NULL) {
				err("dlsym bz2: %s", dlerror());
				dlclose(h);
			}
		}
	}
	return 0;
}

static long handle_eboot(void)
{
	struct {
		unsigned int sig;
		unsigned int dontcare[8];
		unsigned int psar_offs;
	} pbp_hdr;
	struct {
		unsigned int offset;
		unsigned int size;
		unsigned int dontcare[6];
	} index_entry;
	char psar_sig[9];
	unsigned int cdimg_base;
	int i, ret;
	FILE *f;

	f = fopen(cd_fname, "rb");
	if (f == NULL) {
		err("missing file: %s: ", cd_fname);
		perror(NULL);
		return -1;
	}

	ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), f);
	if (ret != sizeof(pbp_hdr)) {
		err("failed to read pbp\n");
		goto fail_io;
	}

	ret = fseek(f, pbp_hdr.psar_offs, SEEK_SET);
	if (ret != 0) {
		err("failed to seek to %x\n", pbp_hdr.psar_offs);
		goto fail_io;
	}

	ret = fread(psar_sig, 1, sizeof(psar_sig), f);
	if (ret != sizeof(psar_sig)) {
		err("failed to read psar_sig\n");
		goto fail_io;
	}

	psar_sig[8] = 0;
	if (strcmp(psar_sig, "PSISOIMG") != 0) {
		err("bad psar_sig: %s\n", psar_sig);
		goto fail_io;
	}

	// seek to ISO index
	ret = fseek(f, 0x4000 - sizeof(psar_sig), SEEK_CUR);
	if (ret != 0) {
		err("failed to seek to ISO index\n");
		goto fail_io;
	}

	cd_index_len = (0x100000 - 0x4000) / sizeof(index_entry);
	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	if (cd_index_table == NULL)
		goto fail_io;

	cdimg_base = pbp_hdr.psar_offs + 0x100000;
	for (i = 0; i < cd_index_len; i++) {
		ret = fread(&index_entry, 1, sizeof(index_entry), f);
		if (ret != sizeof(index_entry)) {
			err("failed to read index_entry #%d\n", i);
			goto fail_index;
		}

		if (index_entry.size == 0)
			break;

		cd_index_table[i] = cdimg_base + index_entry.offset;
	}
	cd_index_table[i] = cdimg_base + index_entry.offset + index_entry.size;

	cd_compression = CDRC_ZLIB2;
	cd_sectors_per_blk = 16;
	cd_file = f;

	printf(PFX "Loaded EBOOT CD Image: %s.\n", cd_fname);
	return 0;

fail_index:
	free(cd_index_table);
	cd_index_table = NULL;
fail_io:
	fclose(f);
	return -1;
}

// This function is invoked by the front-end when opening an ISO
// file for playback
static long CDRopen(void)
{
	union {
		struct {
			unsigned int offset;
			unsigned short size;
		} __attribute__((packed)) ztab_entry;
		struct {
			unsigned int offset;
			unsigned short size;
			unsigned int dontcare;
		} __attribute__((packed)) znxtab_entry;
		unsigned int bztab_entry;
	} u;
	int tabentry_size;
	char table_fname[256];
	long table_size;
	int i, ret;
	char *ext;
	FILE *f = NULL;

	if (cd_file != NULL)
		return 0; // it's already open

	numtracks = 0;
	current_block = -1;
	current_sect_in_blk = 0;

	if (cd_fname == NULL)
		return -1;

	ext = strrchr(cd_fname, '.');
	if (ext == NULL)
		return -1;

	if (strcasecmp(ext, ".pbp") == 0) {
		return handle_eboot();
	}

	// pocketiso stuff
	else if (strcasecmp(ext, ".z") == 0) {
		cd_compression = CDRC_ZLIB;
		tabentry_size = sizeof(u.ztab_entry);
		snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	}
	else if (strcasecmp(ext, ".znx") == 0) {
		cd_compression = CDRC_ZLIB;
		tabentry_size = sizeof(u.znxtab_entry);
		snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	}
	else if (strcasecmp(ext, ".bz") == 0) {
		if (pBZ2_bzBuffToBuffDecompress == NULL) {
			err("libbz2 unavailable for .bz2 handling\n");
			return -1;
		}
		cd_compression = CDRC_BZ;
		tabentry_size = sizeof(u.bztab_entry);
		snprintf(table_fname, sizeof(table_fname), "%s.index", cd_fname);
	}
	else {
		err("unhandled extension: %s\n", ext);
		return -1;
	}

	f = fopen(table_fname, "rb");
	if (f == NULL) {
		err("missing file: %s: ", table_fname);
		perror(NULL);
		return -1;
	}

	ret = fseek(f, 0, SEEK_END);
	if (ret != 0) {
		err("failed to seek\n");
		goto fail_table_io;
	}
	table_size = ftell(f);
	fseek(f, 0, SEEK_SET);

	if (table_size > 4 * 1024 * 1024) {
		err(".table too large\n");
		goto fail_table_io;
	}

	cd_index_len = table_size / tabentry_size;

	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	if (cd_index_table == NULL)
		goto fail_table_io;

	switch (cd_compression) {
	case CDRC_ZLIB:
		// a Z.table file is binary where each element represents
		// one compressed frame.  
		//    4 bytes: the offset of the frame in the .Z file
		//    2 bytes: the length of the compressed frame
		// .znx.table has 4 additional bytes (xa header??)
		u.znxtab_entry.dontcare = 0;
		for (i = 0; i < cd_index_len; i++) {
			ret = fread(&u, 1, tabentry_size, f);
			if (ret != tabentry_size) {
				err(".table read failed on entry %d/%d\n", i, cd_index_len);
				goto fail_table_io_read;
			}
			cd_index_table[i] = u.ztab_entry.offset;
			//if (u.znxtab_entry.dontcare != 0)
			//	printf("znx %08x!\n", u.znxtab_entry.dontcare);
		}
		// fake entry, so that we know last compressed block size
		cd_index_table[i] = u.ztab_entry.offset + u.ztab_entry.size;
		cd_sectors_per_blk = 1;
		break;
	case CDRC_BZ:
		// the .BZ.table file is arranged so that one entry represents
		// 10 compressed frames. Each element is a 4 byte unsigned integer
		// representing the offset in the .BZ file. Last entry is the size
		// of the compressed file.
		for (i = 0; i < cd_index_len; i++) {
			ret = fread(&u.bztab_entry, 1, sizeof(u.bztab_entry), f);
			if (ret != sizeof(u.bztab_entry)) {
				err(".table read failed on entry %d/%d\n", i, cd_index_len);
				goto fail_table_io_read;
			}
			cd_index_table[i] = u.bztab_entry;
		}
		cd_sectors_per_blk = 10;
		break;
	}

	cd_file = fopen(cd_fname, "rb");
	if (cd_file == NULL) {
		err("failed to open: %s: ", table_fname);
		perror(NULL);
		goto fail_img;
	}
	fclose(f);

	printf(PFX "Loaded compressed CD Image: %s.\n", cd_fname);

	return 0;

fail_img:
fail_table_io_read:
	free(cd_index_table);
	cd_index_table = NULL;
fail_table_io:
	fclose(f);
	return -1;
}

#define FUNC(n) { #n, n }

static const struct {
	const char *name;
	void *func;
} plugin_funcs[] = {
	/* CDR */
	FUNC(CDRinit),
	FUNC(CDRshutdown),
	FUNC(CDRopen),
	FUNC(CDRclose),
	FUNC(CDRgetTN),
	FUNC(CDRgetTD),
	FUNC(CDRreadTrack),
	FUNC(CDRgetBuffer),
	FUNC(CDRgetBufferSub),
	FUNC(CDRplay),
	FUNC(CDRstop),
	FUNC(CDRgetStatus),
};

void cdrcimg_set_fname(const char *fname)
{
	cd_fname = fname;
}

void *cdrcimg_get_sym(const char *sym)
{
	int i;
	for (i = 0; i < sizeof(plugin_funcs) / sizeof(plugin_funcs[0]); i++)
		if (strcmp(plugin_funcs[i].name, sym) == 0)
			return plugin_funcs[i].func;
	return NULL;
}
Commit	Line	Data
	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2010
	3	*
	4	* This work is licensed under the terms of any of these licenses
	5	* (at your option):
	6	* - GNU GPL, version 2 or later.
	7	* - GNU LGPL, version 2.1 or later.
	8	* See the COPYING file in the top-level directory.
	9	*/
	10
	11	#include <stdio.h>
	12	#include <string.h>
	13	#include <stdlib.h>
	14	#include <zlib.h>
	15	#include <bzlib.h>
	16	#include <dlfcn.h>
	17
	18	#include "cdrcimg.h"
	19
	20	#define PFX "cdrcimg: "
	21	#define err(f, ...) fprintf(stderr, PFX f, ##__VA_ARGS__)
	22
	23	#define CD_FRAMESIZE_RAW 2352
	24
	25	enum {
	26	CDRC_ZLIB,
	27	CDRC_ZLIB2,
	28	CDRC_BZ,
	29	};
	30
	31	static const char *cd_fname;
	32	static unsigned int *cd_index_table;
	33	static unsigned int cd_index_len;
	34	static unsigned int cd_sectors_per_blk;
	35	static int cd_compression;
	36	static FILE *cd_file;
	37
	38	static int (pBZ2_bzBuffToBuffDecompress)(char dest, unsigned int destLen, char source,
	39	unsigned int sourceLen, int small, int verbosity);
	40
	41	static struct {
	42	unsigned char raw[16][CD_FRAMESIZE_RAW];
	43	unsigned char compressed[CD_FRAMESIZE_RAW * 16 + 100];
	44	} *cdbuffer;
	45	static int current_block, current_sect_in_blk;
	46
	47	struct CdrStat;
	48	extern long CDR__getStatus(struct CdrStat *stat);
	49
	50	struct CdrStat
	51	{
	52	unsigned int Type;
	53	unsigned int Status;
	54	unsigned char Time[3]; // current playing time
	55	};
	56
	57	struct trackinfo {
	58	enum {DATA, CDDA} type;
	59	char start[3]; // MSF-format
	60	char length[3]; // MSF-format
	61	};
	62
	63	#define MAXTRACKS 100 /* How many tracks can a CD hold? */
	64
	65	static int numtracks = 0;
	66
	67	#define btoi(b) ((b) / 16 * 10 + (b) % 16) /* BCD to u_char */
	68	#define MSF2SECT(m, s, f) (((m) * 60 + (s) - 2) * 75 + (f))
	69
	70	// return Starting and Ending Track
	71	// buffer:
	72	// byte 0 - start track
	73	// byte 1 - end track
	74	static long CDRgetTN(unsigned char *buffer)
	75	{
	76	buffer[0] = 1;
	77	buffer[1] = numtracks > 0 ? numtracks : 1;
	78
	79	return 0;
	80	}
	81
	82	// return Track Time
	83	// buffer:
	84	// byte 0 - frame
	85	// byte 1 - second
	86	// byte 2 - minute
	87	static long CDRgetTD(unsigned char track, unsigned char *buffer)
	88	{
	89	buffer[2] = 0;
	90	buffer[1] = 2;
	91	buffer[0] = 0;
	92
	93	return 0;
	94	}
	95
	96	int uncompress2(void out, unsigned long out_size, void *in, unsigned long in_size)
	97	{
	98	static z_stream z;
	99	int ret = 0;
	100
	101	if (z.zalloc == NULL) {
	102	// XXX: one-time leak here..
	103	z.next_in = Z_NULL;
	104	z.avail_in = 0;
	105	z.zalloc = Z_NULL;
	106	z.zfree = Z_NULL;
	107	z.opaque = Z_NULL;
	108	ret = inflateInit2(&z, -15);
	109	}
	110	else
	111	ret = inflateReset(&z);
	112	if (ret != Z_OK)
	113	return ret;
	114
	115	z.next_in = in;
	116	z.avail_in = in_size;
	117	z.next_out = out;
	118	z.avail_out = *out_size;
	119
	120	ret = inflate(&z, Z_NO_FLUSH);
	121	//inflateEnd(&z);
	122
	123	*out_size -= z.avail_out;
	124	return ret == 1 ? 0 : ret;
	125	}
	126
	127	// read track
	128	// time: byte 0 - minute; byte 1 - second; byte 2 - frame
	129	// uses bcd format
	130	static long CDRreadTrack(unsigned char *time)
	131	{
	132	unsigned int start_byte, size;
	133	unsigned long cdbuffer_size;
	134	int ret, sector, block;
	135
	136	if (cd_file == NULL)
	137	return -1;
	138
	139	sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
	140
	141	// avoid division if possible
	142	switch (cd_sectors_per_blk) {
	143	case 1:
	144	block = sector;
	145	current_sect_in_blk = 0;
	146	break;
	147	case 10:
	148	block = sector / 10;
	149	current_sect_in_blk = sector % 10;
	150	break;
	151	case 16:
	152	block = sector >> 4;
	153	current_sect_in_blk = sector & 15;
	154	break;
	155	default:
	156	err("unhandled cd_sectors_per_blk: %d\n", cd_sectors_per_blk);
	157	return -1;
	158	}
	159
	160	if (block == current_block) {
	161	// it's already there, nothing to do
	162	//printf("hit sect %d\n", sector);
	163	return 0;
	164	}
	165
	166	if (sector >= cd_index_len * cd_sectors_per_blk) {
	167	err("sector %d is past track end\n", sector);
	168	return -1;
	169	}
	170
	171	start_byte = cd_index_table[block];
	172	if (fseek(cd_file, start_byte, SEEK_SET) != 0) {
	173	err("seek error for block %d at %x: ",
	174	block, start_byte);
	175	perror(NULL);
	176	return -1;
	177	}
	178
	179	size = cd_index_table[block + 1] - start_byte;
	180	if (size > sizeof(cdbuffer->compressed)) {
	181	err("block %d is too large: %u\n", block, size);
	182	return -1;
	183	}
	184
	185	if (fread(cdbuffer->compressed, 1, size, cd_file) != size) {
	186	err("read error for block %d at %x: ", block, start_byte);
	187	perror(NULL);
	188	return -1;
	189	}
	190
	191	cdbuffer_size = sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk;
	192	switch (cd_compression) {
	193	case CDRC_ZLIB:
	194	ret = uncompress(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
	195	break;
	196	case CDRC_ZLIB2:
	197	ret = uncompress2(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
	198	break;
	199	case CDRC_BZ:
	200	ret = pBZ2_bzBuffToBuffDecompress((char )cdbuffer->raw, (unsigned int )&cdbuffer_size,
	201	(char *)cdbuffer->compressed, size, 0, 0);
	202	break;
	203	default:
	204	err("bad cd_compression: %d\n", cd_compression);
	205	return -1;
	206	}
	207
	208	if (ret != 0) {
	209	err("uncompress failed with %d for block %d, sector %d\n",
	210	ret, block, sector);
	211	return -1;
	212	}
	213	if (cdbuffer_size != sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk)
	214	err("cdbuffer_size: %lu != %d, sector %d\n", cdbuffer_size,
	215	(int)sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk, sector);
	216
	217	// done at last!
	218	current_block = block;
	219	return 0;
	220	}
	221
	222	// return read track
	223	static unsigned char *CDRgetBuffer(void)
	224	{
	225	return cdbuffer->raw[current_sect_in_blk] + 12;
	226	}
	227
	228	// plays cdda audio
	229	// sector: byte 0 - minute; byte 1 - second; byte 2 - frame
	230	// does NOT uses bcd format
	231	static long CDRplay(unsigned char *time)
	232	{
	233	return 0;
	234	}
	235
	236	// stops cdda audio
	237	static long CDRstop(void)
	238	{
	239	return 0;
	240	}
	241
	242	// gets subchannel data
	243	static unsigned char* CDRgetBufferSub(void)
	244	{
	245	return NULL;
	246	}
	247
	248	static long CDRgetStatus(struct CdrStat *stat) {
	249	CDR__getStatus(stat);
	250
	251	stat->Type = 0x01;
	252
	253	return 0;
	254	}
	255
	256	static long CDRclose(void)
	257	{
	258	if (cd_file != NULL) {
	259	fclose(cd_file);
	260	cd_file = NULL;
	261	}
	262	if (cd_index_table != NULL) {
	263	free(cd_index_table);
	264	cd_index_table = NULL;
	265	}
	266	return 0;
	267	}
	268
	269	static long CDRshutdown(void)
	270	{
	271	return CDRclose();
	272	}
	273
	274	static long CDRinit(void)
	275	{
	276	if (cdbuffer == NULL) {
	277	cdbuffer = malloc(sizeof(*cdbuffer));
	278	if (cdbuffer == NULL) {
	279	err("OOM\n");
	280	return -1;
	281	}
	282	}
	283	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	284	void *h = dlopen("/usr/lib/libbz2.so.1", RTLD_LAZY);
	285	if (h == NULL)
	286	h = dlopen("./lib/libbz2.so.1", RTLD_LAZY);
	287	if (h != NULL) {
	288	pBZ2_bzBuffToBuffDecompress = dlsym(h, "BZ2_bzBuffToBuffDecompress");
	289	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	290	err("dlsym bz2: %s", dlerror());
	291	dlclose(h);
	292	}
	293	}
	294	}
	295	return 0;
	296	}
	297
	298	static long handle_eboot(void)
	299	{
	300	struct {
	301	unsigned int sig;
	302	unsigned int dontcare[8];
	303	unsigned int psar_offs;
	304	} pbp_hdr;
	305	struct {
	306	unsigned int offset;
	307	unsigned int size;
	308	unsigned int dontcare[6];
	309	} index_entry;
	310	char psar_sig[9];
	311	unsigned int cdimg_base;
	312	int i, ret;
	313	FILE *f;
	314
	315	f = fopen(cd_fname, "rb");
	316	if (f == NULL) {
	317	err("missing file: %s: ", cd_fname);
	318	perror(NULL);
	319	return -1;
	320	}
	321
	322	ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), f);
	323	if (ret != sizeof(pbp_hdr)) {
	324	err("failed to read pbp\n");
	325	goto fail_io;
	326	}
	327
	328	ret = fseek(f, pbp_hdr.psar_offs, SEEK_SET);
	329	if (ret != 0) {
	330	err("failed to seek to %x\n", pbp_hdr.psar_offs);
	331	goto fail_io;
	332	}
	333
	334	ret = fread(psar_sig, 1, sizeof(psar_sig), f);
	335	if (ret != sizeof(psar_sig)) {
	336	err("failed to read psar_sig\n");
	337	goto fail_io;
	338	}
	339
	340	psar_sig[8] = 0;
	341	if (strcmp(psar_sig, "PSISOIMG") != 0) {
	342	err("bad psar_sig: %s\n", psar_sig);
	343	goto fail_io;
	344	}
	345
	346	// seek to ISO index
	347	ret = fseek(f, 0x4000 - sizeof(psar_sig), SEEK_CUR);
	348	if (ret != 0) {
	349	err("failed to seek to ISO index\n");
	350	goto fail_io;
	351	}
	352
	353	cd_index_len = (0x100000 - 0x4000) / sizeof(index_entry);
	354	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	355	if (cd_index_table == NULL)
	356	goto fail_io;
	357
	358	cdimg_base = pbp_hdr.psar_offs + 0x100000;
	359	for (i = 0; i < cd_index_len; i++) {
	360	ret = fread(&index_entry, 1, sizeof(index_entry), f);
	361	if (ret != sizeof(index_entry)) {
	362	err("failed to read index_entry #%d\n", i);
	363	goto fail_index;
	364	}
	365
	366	if (index_entry.size == 0)
	367	break;
	368
	369	cd_index_table[i] = cdimg_base + index_entry.offset;
	370	}
	371	cd_index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
	372
	373	cd_compression = CDRC_ZLIB2;
	374	cd_sectors_per_blk = 16;
	375	cd_file = f;
	376
	377	printf(PFX "Loaded EBOOT CD Image: %s.\n", cd_fname);
	378	return 0;
	379
	380	fail_index:
	381	free(cd_index_table);
	382	cd_index_table = NULL;
	383	fail_io:
	384	fclose(f);
	385	return -1;
	386	}
	387
	388	// This function is invoked by the front-end when opening an ISO
	389	// file for playback
	390	static long CDRopen(void)
	391	{
	392	union {
	393	struct {
	394	unsigned int offset;
	395	unsigned short size;
	396	} __attribute__((packed)) ztab_entry;
	397	struct {
	398	unsigned int offset;
	399	unsigned short size;
	400	unsigned int dontcare;
	401	} __attribute__((packed)) znxtab_entry;
	402	unsigned int bztab_entry;
	403	} u;
	404	int tabentry_size;
	405	char table_fname[256];
	406	long table_size;
	407	int i, ret;
	408	char *ext;
	409	FILE *f = NULL;
	410
	411	if (cd_file != NULL)
	412	return 0; // it's already open
	413
	414	numtracks = 0;
	415	current_block = -1;
	416	current_sect_in_blk = 0;
	417
	418	if (cd_fname == NULL)
	419	return -1;
	420
	421	ext = strrchr(cd_fname, '.');
	422	if (ext == NULL)
	423	return -1;
	424
	425	if (strcasecmp(ext, ".pbp") == 0) {
	426	return handle_eboot();
	427	}
	428
	429	// pocketiso stuff
	430	else if (strcasecmp(ext, ".z") == 0) {
	431	cd_compression = CDRC_ZLIB;
	432	tabentry_size = sizeof(u.ztab_entry);
	433	snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	434	}
	435	else if (strcasecmp(ext, ".znx") == 0) {
	436	cd_compression = CDRC_ZLIB;
	437	tabentry_size = sizeof(u.znxtab_entry);
	438	snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	439	}
	440	else if (strcasecmp(ext, ".bz") == 0) {
	441	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	442	err("libbz2 unavailable for .bz2 handling\n");
	443	return -1;
	444	}
	445	cd_compression = CDRC_BZ;
	446	tabentry_size = sizeof(u.bztab_entry);
	447	snprintf(table_fname, sizeof(table_fname), "%s.index", cd_fname);
	448	}
	449	else {
	450	err("unhandled extension: %s\n", ext);
	451	return -1;
	452	}
	453
	454	f = fopen(table_fname, "rb");
	455	if (f == NULL) {
	456	err("missing file: %s: ", table_fname);
	457	perror(NULL);
	458	return -1;
	459	}
	460
	461	ret = fseek(f, 0, SEEK_END);
	462	if (ret != 0) {
	463	err("failed to seek\n");
	464	goto fail_table_io;
	465	}
	466	table_size = ftell(f);
	467	fseek(f, 0, SEEK_SET);
	468
	469	if (table_size > 4 * 1024 * 1024) {
	470	err(".table too large\n");
	471	goto fail_table_io;
	472	}
	473
	474	cd_index_len = table_size / tabentry_size;
	475
	476	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	477	if (cd_index_table == NULL)
	478	goto fail_table_io;
	479
	480	switch (cd_compression) {
	481	case CDRC_ZLIB:
	482	// a Z.table file is binary where each element represents
	483	// one compressed frame.
	484	// 4 bytes: the offset of the frame in the .Z file
	485	// 2 bytes: the length of the compressed frame
	486	// .znx.table has 4 additional bytes (xa header??)
	487	u.znxtab_entry.dontcare = 0;
	488	for (i = 0; i < cd_index_len; i++) {
	489	ret = fread(&u, 1, tabentry_size, f);
	490	if (ret != tabentry_size) {
	491	err(".table read failed on entry %d/%d\n", i, cd_index_len);
	492	goto fail_table_io_read;
	493	}
	494	cd_index_table[i] = u.ztab_entry.offset;
	495	//if (u.znxtab_entry.dontcare != 0)
	496	// printf("znx %08x!\n", u.znxtab_entry.dontcare);
	497	}
	498	// fake entry, so that we know last compressed block size
	499	cd_index_table[i] = u.ztab_entry.offset + u.ztab_entry.size;
	500	cd_sectors_per_blk = 1;
	501	break;
	502	case CDRC_BZ:
	503	// the .BZ.table file is arranged so that one entry represents
	504	// 10 compressed frames. Each element is a 4 byte unsigned integer
	505	// representing the offset in the .BZ file. Last entry is the size
	506	// of the compressed file.
	507	for (i = 0; i < cd_index_len; i++) {
	508	ret = fread(&u.bztab_entry, 1, sizeof(u.bztab_entry), f);
	509	if (ret != sizeof(u.bztab_entry)) {
	510	err(".table read failed on entry %d/%d\n", i, cd_index_len);
	511	goto fail_table_io_read;
	512	}
	513	cd_index_table[i] = u.bztab_entry;
	514	}
	515	cd_sectors_per_blk = 10;
	516	break;
	517	}
	518
	519	cd_file = fopen(cd_fname, "rb");
	520	if (cd_file == NULL) {
	521	err("failed to open: %s: ", table_fname);
	522	perror(NULL);
	523	goto fail_img;
	524	}
	525	fclose(f);
	526
	527	printf(PFX "Loaded compressed CD Image: %s.\n", cd_fname);
	528
	529	return 0;
	530
	531	fail_img:
	532	fail_table_io_read:
	533	free(cd_index_table);
	534	cd_index_table = NULL;
	535	fail_table_io:
	536	fclose(f);
	537	return -1;
	538	}
	539
	540	#define FUNC(n) { #n, n }
	541
	542	static const struct {
	543	const char *name;
	544	void *func;
	545	} plugin_funcs[] = {
	546	/* CDR */
	547	FUNC(CDRinit),
	548	FUNC(CDRshutdown),
	549	FUNC(CDRopen),
	550	FUNC(CDRclose),
	551	FUNC(CDRgetTN),
	552	FUNC(CDRgetTD),
	553	FUNC(CDRreadTrack),
	554	FUNC(CDRgetBuffer),
	555	FUNC(CDRgetBufferSub),
	556	FUNC(CDRplay),
	557	FUNC(CDRstop),
	558	FUNC(CDRgetStatus),
	559	};
	560
	561	void cdrcimg_set_fname(const char *fname)
	562	{
	563	cd_fname = fname;
	564	}
	565
	566	void cdrcimg_get_sym(const char sym)
	567	{
	568	int i;
	569	for (i = 0; i < sizeof(plugin_funcs) / sizeof(plugin_funcs[0]); i++)
	570	if (strcmp(plugin_funcs[i].name, sym) == 0)
	571	return plugin_funcs[i].func;
	572	return NULL;
	573	}
	574