[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 <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
47bf65ab	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>
bb5cf0fc	15	#include <dlfcn.h>
47bf65ab	16
	17	#include "cdrcimg.h"
	18
33716956	19	#define PFX "cdrcimg: "
	20	#define err(f, ...) fprintf(stderr, PFX f, ##__VA_ARGS__)
	21
47bf65ab	22	#define CD_FRAMESIZE_RAW 2352
47bf65ab	23
33716956	24	enum {
	25	CDRC_ZLIB,
	26	CDRC_ZLIB2,
	27	CDRC_BZ,
	28	};
	29
47bf65ab	30	static const char *cd_fname;
	31	static unsigned int *cd_index_table;
	32	static unsigned int cd_index_len;
33716956	33	static unsigned int cd_sectors_per_blk;
33716956	34	static int cd_compression;
47bf65ab	35	static FILE *cd_file;
47bf65ab	36
bb5cf0fc	37	static int (pBZ2_bzBuffToBuffDecompress)(char dest, unsigned int destLen, char source,
	38	unsigned int sourceLen, int small, int verbosity);
	39
33716956	40	static struct {
	41	unsigned char raw[16][CD_FRAMESIZE_RAW];
	42	unsigned char compressed[CD_FRAMESIZE_RAW * 16 + 100];
	43	} *cdbuffer;
	44	static int current_block, current_sect_in_blk;
47bf65ab	45
	46	struct CdrStat;
	47	extern long CDR__getStatus(struct CdrStat *stat);
	48
	49	struct CdrStat
	50	{
c668f248	51	unsigned int Type;
c668f248	52	unsigned int Status;
47bf65ab	53	unsigned char Time[3]; // current playing time
	54	};
	55
	56	struct trackinfo {
	57	enum {DATA, CDDA} type;
	58	char start[3]; // MSF-format
	59	char length[3]; // MSF-format
	60	};
	61
	62	#define MAXTRACKS 100 /* How many tracks can a CD hold? */
	63
	64	static int numtracks = 0;
	65
	66	#define btoi(b) ((b) / 16 * 10 + (b) % 16) /* BCD to u_char */
	67	#define MSF2SECT(m, s, f) (((m) * 60 + (s) - 2) * 75 + (f))
	68
	69	// return Starting and Ending Track
	70	// buffer:
	71	// byte 0 - start track
	72	// byte 1 - end track
	73	static long CDRgetTN(unsigned char *buffer)
	74	{
	75	buffer[0] = 1;
	76	buffer[1] = numtracks > 0 ? numtracks : 1;
	77
	78	return 0;
	79	}
	80
	81	// return Track Time
	82	// buffer:
	83	// byte 0 - frame
	84	// byte 1 - second
	85	// byte 2 - minute
	86	static long CDRgetTD(unsigned char track, unsigned char *buffer)
	87	{
	88	buffer[2] = 0;
	89	buffer[1] = 2;
	90	buffer[0] = 0;
	91
	92	return 0;
	93	}
	94
33716956	95	int uncompress2(void out, unsigned long out_size, void *in, unsigned long in_size)
	96	{
	97	static z_stream z;
	98	int ret = 0;
	99
	100	if (z.zalloc == NULL) {
	101	// XXX: one-time leak here..
	102	z.next_in = Z_NULL;
	103	z.avail_in = 0;
	104	z.zalloc = Z_NULL;
	105	z.zfree = Z_NULL;
	106	z.opaque = Z_NULL;
	107	ret = inflateInit2(&z, -15);
	108	}
	109	else
	110	ret = inflateReset(&z);
	111	if (ret != Z_OK)
	112	return ret;
	113
	114	z.next_in = in;
	115	z.avail_in = in_size;
	116	z.next_out = out;
	117	z.avail_out = *out_size;
	118
	119	ret = inflate(&z, Z_NO_FLUSH);
	120	//inflateEnd(&z);
	121
	122	*out_size -= z.avail_out;
	123	return ret == 1 ? 0 : ret;
	124	}
	125
47bf65ab	126	// read track
	127	// time: byte 0 - minute; byte 1 - second; byte 2 - frame
	128	// uses bcd format
	129	static long CDRreadTrack(unsigned char *time)
	130	{
	131	unsigned int start_byte, size;
	132	unsigned long cdbuffer_size;
33716956	133	int ret, sector, block;
47bf65ab	134
	135	if (cd_file == NULL)
	136	return -1;
	137
	138	sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
33716956	139
	140	// avoid division if possible
	141	switch (cd_sectors_per_blk) {
	142	case 1:
	143	block = sector;
	144	current_sect_in_blk = 0;
	145	break;
	146	case 10:
	147	block = sector / 10;
	148	current_sect_in_blk = sector % 10;
	149	break;
	150	case 16:
	151	block = sector >> 4;
	152	current_sect_in_blk = sector & 15;
	153	break;
	154	default:
	155	err("unhandled cd_sectors_per_blk: %d\n", cd_sectors_per_blk);
	156	return -1;
	157	}
	158
	159	if (block == current_block) {
47bf65ab	160	// it's already there, nothing to do
	161	//printf("hit sect %d\n", sector);
	162	return 0;
	163	}
	164
33716956	165	if (sector >= cd_index_len * cd_sectors_per_blk) {
33716956	166	err("sector %d is past track end\n", sector);
47bf65ab	167	return -1;
	168	}
	169
33716956	170	start_byte = cd_index_table[block];
47bf65ab	171	if (fseek(cd_file, start_byte, SEEK_SET) != 0) {
33716956	172	err("seek error for block %d at %x: ",
33716956	173	block, start_byte);
47bf65ab	174	perror(NULL);
	175	return -1;
	176	}
	177
33716956	178	size = cd_index_table[block + 1] - start_byte;
	179	if (size > sizeof(cdbuffer->compressed)) {
	180	err("block %d is too large: %u\n", block, size);
47bf65ab	181	return -1;
	182	}
	183
33716956	184	if (fread(cdbuffer->compressed, 1, size, cd_file) != size) {
33716956	185	err("read error for block %d at %x: ", block, start_byte);
47bf65ab	186	perror(NULL);
	187	return -1;
	188	}
	189
33716956	190	cdbuffer_size = sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk;
	191	switch (cd_compression) {
	192	case CDRC_ZLIB:
	193	ret = uncompress(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
	194	break;
	195	case CDRC_ZLIB2:
	196	ret = uncompress2(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
	197	break;
	198	case CDRC_BZ:
bb5cf0fc	199	ret = pBZ2_bzBuffToBuffDecompress((char )cdbuffer->raw, (unsigned int )&cdbuffer_size,
33716956	200	(char *)cdbuffer->compressed, size, 0, 0);
	201	break;
	202	default:
	203	err("bad cd_compression: %d\n", cd_compression);
	204	return -1;
	205	}
	206
47bf65ab	207	if (ret != 0) {
33716956	208	err("uncompress failed with %d for block %d, sector %d\n",
33716956	209	ret, block, sector);
47bf65ab	210	return -1;
47bf65ab	211	}
33716956	212	if (cdbuffer_size != sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk)
33716956	213	err("cdbuffer_size: %lu != %d, sector %d\n", cdbuffer_size,
c979c3ee	214	(int)sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk, sector);
47bf65ab	215
47bf65ab	216	// done at last!
33716956	217	current_block = block;
47bf65ab	218	return 0;
	219	}
	220
	221	// return read track
	222	static unsigned char *CDRgetBuffer(void)
	223	{
33716956	224	return cdbuffer->raw[current_sect_in_blk] + 12;
47bf65ab	225	}
	226
	227	// plays cdda audio
	228	// sector: byte 0 - minute; byte 1 - second; byte 2 - frame
	229	// does NOT uses bcd format
	230	static long CDRplay(unsigned char *time)
	231	{
	232	return 0;
	233	}
	234
	235	// stops cdda audio
	236	static long CDRstop(void)
	237	{
	238	return 0;
	239	}
	240
	241	// gets subchannel data
	242	static unsigned char* CDRgetBufferSub(void)
	243	{
	244	return NULL;
	245	}
	246
	247	static long CDRgetStatus(struct CdrStat *stat) {
	248	CDR__getStatus(stat);
	249
	250	stat->Type = 0x01;
	251
	252	return 0;
	253	}
	254
	255	static long CDRclose(void)
	256	{
	257	if (cd_file != NULL) {
	258	fclose(cd_file);
	259	cd_file = NULL;
	260	}
	261	if (cd_index_table != NULL) {
	262	free(cd_index_table);
	263	cd_index_table = NULL;
	264	}
	265	return 0;
	266	}
	267
	268	static long CDRshutdown(void)
	269	{
	270	return CDRclose();
	271	}
	272
	273	static long CDRinit(void)
	274	{
33716956	275	if (cdbuffer == NULL) {
	276	cdbuffer = malloc(sizeof(*cdbuffer));
	277	if (cdbuffer == NULL) {
	278	err("OOM\n");
	279	return -1;
	280	}
	281	}
bb5cf0fc	282	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	283	void *h = dlopen("/usr/lib/libbz2.so.1", RTLD_LAZY);
	284	if (h == NULL)
	285	h = dlopen("./lib/libbz2.so.1", RTLD_LAZY);
	286	if (h != NULL) {
	287	pBZ2_bzBuffToBuffDecompress = dlsym(h, "BZ2_bzBuffToBuffDecompress");
	288	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	289	err("dlsym bz2: %s", dlerror());
	290	dlclose(h);
	291	}
	292	}
	293	}
33716956	294	return 0;
	295	}
	296
	297	static long handle_eboot(void)
	298	{
	299	struct {
	300	unsigned int sig;
	301	unsigned int dontcare[8];
	302	unsigned int psar_offs;
	303	} pbp_hdr;
	304	struct {
	305	unsigned int offset;
	306	unsigned int size;
	307	unsigned int dontcare[6];
	308	} index_entry;
	309	char psar_sig[9];
	310	unsigned int cdimg_base;
	311	int i, ret;
	312	FILE *f;
	313
	314	f = fopen(cd_fname, "rb");
	315	if (f == NULL) {
	316	err("missing file: %s: ", cd_fname);
	317	perror(NULL);
	318	return -1;
	319	}
	320
	321	ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), f);
	322	if (ret != sizeof(pbp_hdr)) {
	323	err("failed to read pbp\n");
	324	goto fail_io;
	325	}
	326
	327	ret = fseek(f, pbp_hdr.psar_offs, SEEK_SET);
	328	if (ret != 0) {
	329	err("failed to seek to %x\n", pbp_hdr.psar_offs);
	330	goto fail_io;
	331	}
	332
	333	ret = fread(psar_sig, 1, sizeof(psar_sig), f);
	334	if (ret != sizeof(psar_sig)) {
	335	err("failed to read psar_sig\n");
	336	goto fail_io;
	337	}
	338
	339	psar_sig[8] = 0;
	340	if (strcmp(psar_sig, "PSISOIMG") != 0) {
	341	err("bad psar_sig: %s\n", psar_sig);
	342	goto fail_io;
	343	}
	344
	345	// seek to ISO index
	346	ret = fseek(f, 0x4000 - sizeof(psar_sig), SEEK_CUR);
	347	if (ret != 0) {
	348	err("failed to seek to ISO index\n");
	349	goto fail_io;
	350	}
	351
	352	cd_index_len = (0x100000 - 0x4000) / sizeof(index_entry);
	353	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	354	if (cd_index_table == NULL)
	355	goto fail_io;
	356
	357	cdimg_base = pbp_hdr.psar_offs + 0x100000;
358	for (i = 0; i < cd_index_len; i++) {
359	ret = fread(&index_entry, 1, sizeof(index_entry), f);
360	if (ret != sizeof(index_entry)) {
361	err("failed to read index_entry #%d\n", i);
362	goto fail_index;
363	}
364
365	if (index_entry.size == 0)
366	break;
367
368	cd_index_table[i] = cdimg_base + index_entry.offset;
369	}
370	cd_index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
371
372	cd_compression = CDRC_ZLIB2;
373	cd_sectors_per_blk = 16;
374	cd_file = f;
375
376	printf(PFX "Loaded EBOOT CD Image: %s.\n", cd_fname);
377	return 0;
378
379	fail_index:
380	free(cd_index_table);
381	cd_index_table = NULL;
382	fail_io:
383	fclose(f);
384	return -1;
47bf65ab	385	}
	386
	387	// This function is invoked by the front-end when opening an ISO
	388	// file for playback
	389	static long CDRopen(void)
	390	{
33716956	391	union {
	392	struct {
	393	unsigned int offset;
	394	unsigned short size;
	395	} __attribute__((packed)) ztab_entry;
	396	struct {
	397	unsigned int offset;
	398	unsigned short size;
	399	unsigned int dontcare;
	400	} __attribute__((packed)) znxtab_entry;
	401	unsigned int bztab_entry;
	402	} u;
	403	int tabentry_size;
47bf65ab	404	char table_fname[256];
	405	long table_size;
	406	int i, ret;
33716956	407	char *ext;
33716956	408	FILE *f = NULL;
47bf65ab	409
	410	if (cd_file != NULL)
	411	return 0; // it's already open
	412
	413	numtracks = 0;
33716956	414	current_block = -1;
33716956	415	current_sect_in_blk = 0;
47bf65ab	416
	417	if (cd_fname == NULL)
	418	return -1;
	419
33716956	420	ext = strrchr(cd_fname, '.');
	421	if (ext == NULL)
	422	return -1;
	423
	424	if (strcasecmp(ext, ".pbp") == 0) {
	425	return handle_eboot();
	426	}
	427
	428	// pocketiso stuff
	429	else if (strcasecmp(ext, ".z") == 0) {
	430	cd_compression = CDRC_ZLIB;
	431	tabentry_size = sizeof(u.ztab_entry);
	432	snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	433	}
	434	else if (strcasecmp(ext, ".znx") == 0) {
	435	cd_compression = CDRC_ZLIB;
	436	tabentry_size = sizeof(u.znxtab_entry);
	437	snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	438	}
	439	else if (strcasecmp(ext, ".bz") == 0) {
bb5cf0fc	440	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	441	err("libbz2 unavailable for .bz2 handling\n");
	442	return -1;
	443	}
33716956	444	cd_compression = CDRC_BZ;
	445	tabentry_size = sizeof(u.bztab_entry);
	446	snprintf(table_fname, sizeof(table_fname), "%s.index", cd_fname);
	447	}
	448	else {
	449	err("unhandled extension: %s\n", ext);
	450	return -1;
	451	}
	452
47bf65ab	453	f = fopen(table_fname, "rb");
47bf65ab	454	if (f == NULL) {
33716956	455	err("missing file: %s: ", table_fname);
47bf65ab	456	perror(NULL);
	457	return -1;
	458	}
	459
	460	ret = fseek(f, 0, SEEK_END);
	461	if (ret != 0) {
33716956	462	err("failed to seek\n");
47bf65ab	463	goto fail_table_io;
	464	}
	465	table_size = ftell(f);
	466	fseek(f, 0, SEEK_SET);
	467
33716956	468	if (table_size > 4 * 1024 * 1024) {
33716956	469	err(".table too large\n");
47bf65ab	470	goto fail_table_io;
	471	}
	472
33716956	473	cd_index_len = table_size / tabentry_size;
33716956	474
47bf65ab	475	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	476	if (cd_index_table == NULL)
	477	goto fail_table_io;
	478
33716956	479	switch (cd_compression) {
	480	case CDRC_ZLIB:
	481	// a Z.table file is binary where each element represents
	482	// one compressed frame.
	483	// 4 bytes: the offset of the frame in the .Z file
	484	// 2 bytes: the length of the compressed frame
	485	// .znx.table has 4 additional bytes (xa header??)
	486	u.znxtab_entry.dontcare = 0;
	487	for (i = 0; i < cd_index_len; i++) {
	488	ret = fread(&u, 1, tabentry_size, f);
	489	if (ret != tabentry_size) {
	490	err(".table read failed on entry %d/%d\n", i, cd_index_len);
	491	goto fail_table_io_read;
	492	}
	493	cd_index_table[i] = u.ztab_entry.offset;
	494	//if (u.znxtab_entry.dontcare != 0)
	495	// printf("znx %08x!\n", u.znxtab_entry.dontcare);
	496	}
	497	// fake entry, so that we know last compressed block size
	498	cd_index_table[i] = u.ztab_entry.offset + u.ztab_entry.size;
	499	cd_sectors_per_blk = 1;
	500	break;
	501	case CDRC_BZ:
	502	// the .BZ.table file is arranged so that one entry represents
	503	// 10 compressed frames. Each element is a 4 byte unsigned integer
	504	// representing the offset in the .BZ file. Last entry is the size
	505	// of the compressed file.
	506	for (i = 0; i < cd_index_len; i++) {
	507	ret = fread(&u.bztab_entry, 1, sizeof(u.bztab_entry), f);
	508	if (ret != sizeof(u.bztab_entry)) {
	509	err(".table read failed on entry %d/%d\n", i, cd_index_len);
	510	goto fail_table_io_read;
	511	}
	512	cd_index_table[i] = u.bztab_entry;
47bf65ab	513	}
33716956	514	cd_sectors_per_blk = 10;
33716956	515	break;
47bf65ab	516	}
47bf65ab	517
	518	cd_file = fopen(cd_fname, "rb");
	519	if (cd_file == NULL) {
33716956	520	err("failed to open: %s: ", table_fname);
47bf65ab	521	perror(NULL);
	522	goto fail_img;
	523	}
	524	fclose(f);
	525
33716956	526	printf(PFX "Loaded compressed CD Image: %s.\n", cd_fname);
47bf65ab	527
	528	return 0;
	529
	530	fail_img:
	531	fail_table_io_read:
	532	free(cd_index_table);
	533	cd_index_table = NULL;
	534	fail_table_io:
	535	fclose(f);
	536	return -1;
	537	}
	538
	539	#define FUNC(n) { #n, n }
	540
	541	static const struct {
	542	const char *name;
	543	void *func;
	544	} plugin_funcs[] = {
	545	/* CDR */
	546	FUNC(CDRinit),
	547	FUNC(CDRshutdown),
	548	FUNC(CDRopen),
	549	FUNC(CDRclose),
	550	FUNC(CDRgetTN),
	551	FUNC(CDRgetTD),
	552	FUNC(CDRreadTrack),
	553	FUNC(CDRgetBuffer),
	554	FUNC(CDRgetBufferSub),
	555	FUNC(CDRplay),
	556	FUNC(CDRstop),
	557	FUNC(CDRgetStatus),
	558	};
	559
	560	void cdrcimg_set_fname(const char *fname)
	561	{
	562	cd_fname = fname;
	563	}
	564
	565	void cdrcimg_get_sym(const char sym)
	566	{
	567	int i;
	568	for (i = 0; i < sizeof(plugin_funcs) / sizeof(plugin_funcs[0]); i++)
	569	if (strcmp(plugin_funcs[i].name, sym) == 0)
	570	return plugin_funcs[i].func;
	571	return NULL;
	572	}
	573