[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>
#ifndef _WIN32
#define CALLBACK
#include <dlfcn.h>
#else
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

#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 CALLBACK 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;
}

static int uncompress2_pcsx(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_pcsx(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;
		}
	}
#ifndef _WIN32
	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);
			}
		}
	}
#endif
	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>
003cfc63	15	#ifndef _WIN32
003cfc63	16	#define CALLBACK
bb5cf0fc	17	#include <dlfcn.h>
003cfc63	18	#else
	19	#define WIN32_LEAN_AND_MEAN
	20	#include <windows.h>
	21	#endif
47bf65ab	22
	23	#include "cdrcimg.h"
	24
33716956	25	#define PFX "cdrcimg: "
	26	#define err(f, ...) fprintf(stderr, PFX f, ##__VA_ARGS__)
	27
47bf65ab	28	#define CD_FRAMESIZE_RAW 2352
47bf65ab	29
33716956	30	enum {
	31	CDRC_ZLIB,
	32	CDRC_ZLIB2,
	33	CDRC_BZ,
	34	};
	35
47bf65ab	36	static const char *cd_fname;
	37	static unsigned int *cd_index_table;
	38	static unsigned int cd_index_len;
33716956	39	static unsigned int cd_sectors_per_blk;
33716956	40	static int cd_compression;
47bf65ab	41	static FILE *cd_file;
47bf65ab	42
bb5cf0fc	43	static int (pBZ2_bzBuffToBuffDecompress)(char dest, unsigned int destLen, char source,
	44	unsigned int sourceLen, int small, int verbosity);
	45
33716956	46	static struct {
	47	unsigned char raw[16][CD_FRAMESIZE_RAW];
	48	unsigned char compressed[CD_FRAMESIZE_RAW * 16 + 100];
	49	} *cdbuffer;
	50	static int current_block, current_sect_in_blk;
47bf65ab	51
47bf65ab	52	struct CdrStat;
003cfc63	53	extern long CALLBACK CDR__getStatus(struct CdrStat *stat);
47bf65ab	54
	55	struct CdrStat
	56	{
c668f248	57	unsigned int Type;
c668f248	58	unsigned int Status;
47bf65ab	59	unsigned char Time[3]; // current playing time
	60	};
	61
	62	struct trackinfo {
	63	enum {DATA, CDDA} type;
	64	char start[3]; // MSF-format
	65	char length[3]; // MSF-format
	66	};
	67
	68	#define MAXTRACKS 100 /* How many tracks can a CD hold? */
	69
	70	static int numtracks = 0;
	71
	72	#define btoi(b) ((b) / 16 * 10 + (b) % 16) /* BCD to u_char */
	73	#define MSF2SECT(m, s, f) (((m) * 60 + (s) - 2) * 75 + (f))
	74
	75	// return Starting and Ending Track
	76	// buffer:
	77	// byte 0 - start track
	78	// byte 1 - end track
	79	static long CDRgetTN(unsigned char *buffer)
	80	{
	81	buffer[0] = 1;
	82	buffer[1] = numtracks > 0 ? numtracks : 1;
	83
	84	return 0;
	85	}
	86
	87	// return Track Time
	88	// buffer:
	89	// byte 0 - frame
	90	// byte 1 - second
	91	// byte 2 - minute
	92	static long CDRgetTD(unsigned char track, unsigned char *buffer)
	93	{
	94	buffer[2] = 0;
	95	buffer[1] = 2;
	96	buffer[0] = 0;
	97
	98	return 0;
	99	}
	100
2dd6a826	101	static int uncompress2_pcsx(void out, unsigned long out_size, void *in, unsigned long in_size)
33716956	102	{
	103	static z_stream z;
	104	int ret = 0;
	105
	106	if (z.zalloc == NULL) {
	107	// XXX: one-time leak here..
	108	z.next_in = Z_NULL;
	109	z.avail_in = 0;
	110	z.zalloc = Z_NULL;
	111	z.zfree = Z_NULL;
	112	z.opaque = Z_NULL;
	113	ret = inflateInit2(&z, -15);
	114	}
	115	else
	116	ret = inflateReset(&z);
	117	if (ret != Z_OK)
	118	return ret;
	119
	120	z.next_in = in;
	121	z.avail_in = in_size;
	122	z.next_out = out;
	123	z.avail_out = *out_size;
	124
	125	ret = inflate(&z, Z_NO_FLUSH);
	126	//inflateEnd(&z);
	127
	128	*out_size -= z.avail_out;
	129	return ret == 1 ? 0 : ret;
	130	}
	131
47bf65ab	132	// read track
	133	// time: byte 0 - minute; byte 1 - second; byte 2 - frame
	134	// uses bcd format
	135	static long CDRreadTrack(unsigned char *time)
	136	{
	137	unsigned int start_byte, size;
	138	unsigned long cdbuffer_size;
33716956	139	int ret, sector, block;
47bf65ab	140
	141	if (cd_file == NULL)
	142	return -1;
	143
	144	sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
33716956	145
	146	// avoid division if possible
	147	switch (cd_sectors_per_blk) {
	148	case 1:
	149	block = sector;
	150	current_sect_in_blk = 0;
	151	break;
	152	case 10:
	153	block = sector / 10;
	154	current_sect_in_blk = sector % 10;
	155	break;
	156	case 16:
	157	block = sector >> 4;
	158	current_sect_in_blk = sector & 15;
	159	break;
	160	default:
	161	err("unhandled cd_sectors_per_blk: %d\n", cd_sectors_per_blk);
	162	return -1;
	163	}
	164
	165	if (block == current_block) {
47bf65ab	166	// it's already there, nothing to do
	167	//printf("hit sect %d\n", sector);
	168	return 0;
	169	}
	170
33716956	171	if (sector >= cd_index_len * cd_sectors_per_blk) {
33716956	172	err("sector %d is past track end\n", sector);
47bf65ab	173	return -1;
	174	}
	175
33716956	176	start_byte = cd_index_table[block];
47bf65ab	177	if (fseek(cd_file, start_byte, SEEK_SET) != 0) {
33716956	178	err("seek error for block %d at %x: ",
33716956	179	block, start_byte);
47bf65ab	180	perror(NULL);
	181	return -1;
	182	}
	183
33716956	184	size = cd_index_table[block + 1] - start_byte;
	185	if (size > sizeof(cdbuffer->compressed)) {
	186	err("block %d is too large: %u\n", block, size);
47bf65ab	187	return -1;
	188	}
	189
33716956	190	if (fread(cdbuffer->compressed, 1, size, cd_file) != size) {
33716956	191	err("read error for block %d at %x: ", block, start_byte);
47bf65ab	192	perror(NULL);
	193	return -1;
	194	}
	195
33716956	196	cdbuffer_size = sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk;
	197	switch (cd_compression) {
	198	case CDRC_ZLIB:
	199	ret = uncompress(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
	200	break;
	201	case CDRC_ZLIB2:
2dd6a826	202	ret = uncompress2_pcsx(cdbuffer->raw[0], &cdbuffer_size, cdbuffer->compressed, size);
33716956	203	break;
33716956	204	case CDRC_BZ:
bb5cf0fc	205	ret = pBZ2_bzBuffToBuffDecompress((char )cdbuffer->raw, (unsigned int )&cdbuffer_size,
33716956	206	(char *)cdbuffer->compressed, size, 0, 0);
	207	break;
	208	default:
	209	err("bad cd_compression: %d\n", cd_compression);
	210	return -1;
	211	}
	212
47bf65ab	213	if (ret != 0) {
33716956	214	err("uncompress failed with %d for block %d, sector %d\n",
33716956	215	ret, block, sector);
47bf65ab	216	return -1;
47bf65ab	217	}
33716956	218	if (cdbuffer_size != sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk)
33716956	219	err("cdbuffer_size: %lu != %d, sector %d\n", cdbuffer_size,
c979c3ee	220	(int)sizeof(cdbuffer->raw[0]) * cd_sectors_per_blk, sector);
47bf65ab	221
47bf65ab	222	// done at last!
33716956	223	current_block = block;
47bf65ab	224	return 0;
	225	}
	226
	227	// return read track
	228	static unsigned char *CDRgetBuffer(void)
	229	{
33716956	230	return cdbuffer->raw[current_sect_in_blk] + 12;
47bf65ab	231	}
	232
	233	// plays cdda audio
	234	// sector: byte 0 - minute; byte 1 - second; byte 2 - frame
	235	// does NOT uses bcd format
	236	static long CDRplay(unsigned char *time)
	237	{
	238	return 0;
	239	}
	240
	241	// stops cdda audio
	242	static long CDRstop(void)
	243	{
	244	return 0;
	245	}
	246
	247	// gets subchannel data
	248	static unsigned char* CDRgetBufferSub(void)
	249	{
	250	return NULL;
	251	}
	252
	253	static long CDRgetStatus(struct CdrStat *stat) {
	254	CDR__getStatus(stat);
	255
	256	stat->Type = 0x01;
	257
	258	return 0;
	259	}
	260
	261	static long CDRclose(void)
	262	{
	263	if (cd_file != NULL) {
	264	fclose(cd_file);
	265	cd_file = NULL;
	266	}
	267	if (cd_index_table != NULL) {
	268	free(cd_index_table);
	269	cd_index_table = NULL;
	270	}
	271	return 0;
	272	}
	273
	274	static long CDRshutdown(void)
	275	{
	276	return CDRclose();
	277	}
	278
	279	static long CDRinit(void)
	280	{
33716956	281	if (cdbuffer == NULL) {
	282	cdbuffer = malloc(sizeof(*cdbuffer));
	283	if (cdbuffer == NULL) {
	284	err("OOM\n");
	285	return -1;
	286	}
	287	}
003cfc63	288	#ifndef _WIN32
bb5cf0fc	289	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	290	void *h = dlopen("/usr/lib/libbz2.so.1", RTLD_LAZY);
	291	if (h == NULL)
	292	h = dlopen("./lib/libbz2.so.1", RTLD_LAZY);
	293	if (h != NULL) {
	294	pBZ2_bzBuffToBuffDecompress = dlsym(h, "BZ2_bzBuffToBuffDecompress");
	295	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	296	err("dlsym bz2: %s", dlerror());
	297	dlclose(h);
	298	}
	299	}
	300	}
003cfc63	301	#endif
33716956	302	return 0;
	303	}
	304
	305	static long handle_eboot(void)
	306	{
	307	struct {
	308	unsigned int sig;
	309	unsigned int dontcare[8];
	310	unsigned int psar_offs;
	311	} pbp_hdr;
	312	struct {
	313	unsigned int offset;
	314	unsigned int size;
	315	unsigned int dontcare[6];
	316	} index_entry;
	317	char psar_sig[9];
	318	unsigned int cdimg_base;
	319	int i, ret;
	320	FILE *f;
	321
	322	f = fopen(cd_fname, "rb");
	323	if (f == NULL) {
	324	err("missing file: %s: ", cd_fname);
	325	perror(NULL);
	326	return -1;
	327	}
	328
	329	ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), f);
	330	if (ret != sizeof(pbp_hdr)) {
	331	err("failed to read pbp\n");
	332	goto fail_io;
	333	}
	334
	335	ret = fseek(f, pbp_hdr.psar_offs, SEEK_SET);
	336	if (ret != 0) {
	337	err("failed to seek to %x\n", pbp_hdr.psar_offs);
	338	goto fail_io;
	339	}
	340
	341	ret = fread(psar_sig, 1, sizeof(psar_sig), f);
	342	if (ret != sizeof(psar_sig)) {
	343	err("failed to read psar_sig\n");
	344	goto fail_io;
	345	}
	346
	347	psar_sig[8] = 0;
	348	if (strcmp(psar_sig, "PSISOIMG") != 0) {
	349	err("bad psar_sig: %s\n", psar_sig);
	350	goto fail_io;
	351	}
	352
	353	// seek to ISO index
	354	ret = fseek(f, 0x4000 - sizeof(psar_sig), SEEK_CUR);
	355	if (ret != 0) {
	356	err("failed to seek to ISO index\n");
	357	goto fail_io;
	358	}
	359
	360	cd_index_len = (0x100000 - 0x4000) / sizeof(index_entry);
	361	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	362	if (cd_index_table == NULL)
	363	goto fail_io;
	364
	365	cdimg_base = pbp_hdr.psar_offs + 0x100000;
366	for (i = 0; i < cd_index_len; i++) {
367	ret = fread(&index_entry, 1, sizeof(index_entry), f);
368	if (ret != sizeof(index_entry)) {
369	err("failed to read index_entry #%d\n", i);
370	goto fail_index;
371	}
372
373	if (index_entry.size == 0)
374	break;
375
376	cd_index_table[i] = cdimg_base + index_entry.offset;
377	}
378	cd_index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
379
380	cd_compression = CDRC_ZLIB2;
381	cd_sectors_per_blk = 16;
382	cd_file = f;
383
384	printf(PFX "Loaded EBOOT CD Image: %s.\n", cd_fname);
385	return 0;
386
387	fail_index:
388	free(cd_index_table);
389	cd_index_table = NULL;
390	fail_io:
391	fclose(f);
392	return -1;
47bf65ab	393	}
	394
	395	// This function is invoked by the front-end when opening an ISO
	396	// file for playback
	397	static long CDRopen(void)
	398	{
33716956	399	union {
	400	struct {
	401	unsigned int offset;
	402	unsigned short size;
	403	} __attribute__((packed)) ztab_entry;
	404	struct {
	405	unsigned int offset;
	406	unsigned short size;
	407	unsigned int dontcare;
	408	} __attribute__((packed)) znxtab_entry;
	409	unsigned int bztab_entry;
	410	} u;
	411	int tabentry_size;
47bf65ab	412	char table_fname[256];
	413	long table_size;
	414	int i, ret;
33716956	415	char *ext;
33716956	416	FILE *f = NULL;
47bf65ab	417
	418	if (cd_file != NULL)
	419	return 0; // it's already open
	420
	421	numtracks = 0;
33716956	422	current_block = -1;
33716956	423	current_sect_in_blk = 0;
47bf65ab	424
	425	if (cd_fname == NULL)
	426	return -1;
	427
33716956	428	ext = strrchr(cd_fname, '.');
	429	if (ext == NULL)
	430	return -1;
	431
	432	if (strcasecmp(ext, ".pbp") == 0) {
	433	return handle_eboot();
	434	}
	435
	436	// pocketiso stuff
	437	else if (strcasecmp(ext, ".z") == 0) {
	438	cd_compression = CDRC_ZLIB;
	439	tabentry_size = sizeof(u.ztab_entry);
	440	snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	441	}
	442	else if (strcasecmp(ext, ".znx") == 0) {
	443	cd_compression = CDRC_ZLIB;
	444	tabentry_size = sizeof(u.znxtab_entry);
	445	snprintf(table_fname, sizeof(table_fname), "%s.table", cd_fname);
	446	}
	447	else if (strcasecmp(ext, ".bz") == 0) {
bb5cf0fc	448	if (pBZ2_bzBuffToBuffDecompress == NULL) {
	449	err("libbz2 unavailable for .bz2 handling\n");
	450	return -1;
	451	}
33716956	452	cd_compression = CDRC_BZ;
	453	tabentry_size = sizeof(u.bztab_entry);
	454	snprintf(table_fname, sizeof(table_fname), "%s.index", cd_fname);
	455	}
	456	else {
	457	err("unhandled extension: %s\n", ext);
	458	return -1;
	459	}
	460
47bf65ab	461	f = fopen(table_fname, "rb");
47bf65ab	462	if (f == NULL) {
33716956	463	err("missing file: %s: ", table_fname);
47bf65ab	464	perror(NULL);
	465	return -1;
	466	}
	467
	468	ret = fseek(f, 0, SEEK_END);
	469	if (ret != 0) {
33716956	470	err("failed to seek\n");
47bf65ab	471	goto fail_table_io;
	472	}
	473	table_size = ftell(f);
	474	fseek(f, 0, SEEK_SET);
	475
33716956	476	if (table_size > 4 * 1024 * 1024) {
33716956	477	err(".table too large\n");
47bf65ab	478	goto fail_table_io;
	479	}
	480
33716956	481	cd_index_len = table_size / tabentry_size;
33716956	482
47bf65ab	483	cd_index_table = malloc((cd_index_len + 1) * sizeof(cd_index_table[0]));
	484	if (cd_index_table == NULL)
	485	goto fail_table_io;
	486
33716956	487	switch (cd_compression) {
	488	case CDRC_ZLIB:
	489	// a Z.table file is binary where each element represents
	490	// one compressed frame.
	491	// 4 bytes: the offset of the frame in the .Z file
	492	// 2 bytes: the length of the compressed frame
	493	// .znx.table has 4 additional bytes (xa header??)
	494	u.znxtab_entry.dontcare = 0;
	495	for (i = 0; i < cd_index_len; i++) {
	496	ret = fread(&u, 1, tabentry_size, f);
	497	if (ret != tabentry_size) {
	498	err(".table read failed on entry %d/%d\n", i, cd_index_len);
	499	goto fail_table_io_read;
	500	}
	501	cd_index_table[i] = u.ztab_entry.offset;
	502	//if (u.znxtab_entry.dontcare != 0)
	503	// printf("znx %08x!\n", u.znxtab_entry.dontcare);
	504	}
	505	// fake entry, so that we know last compressed block size
	506	cd_index_table[i] = u.ztab_entry.offset + u.ztab_entry.size;
	507	cd_sectors_per_blk = 1;
	508	break;
	509	case CDRC_BZ:
	510	// the .BZ.table file is arranged so that one entry represents
	511	// 10 compressed frames. Each element is a 4 byte unsigned integer
	512	// representing the offset in the .BZ file. Last entry is the size
	513	// of the compressed file.
	514	for (i = 0; i < cd_index_len; i++) {
	515	ret = fread(&u.bztab_entry, 1, sizeof(u.bztab_entry), f);
	516	if (ret != sizeof(u.bztab_entry)) {
	517	err(".table read failed on entry %d/%d\n", i, cd_index_len);
	518	goto fail_table_io_read;
	519	}
	520	cd_index_table[i] = u.bztab_entry;
47bf65ab	521	}
33716956	522	cd_sectors_per_blk = 10;
33716956	523	break;
47bf65ab	524	}
47bf65ab	525
	526	cd_file = fopen(cd_fname, "rb");
	527	if (cd_file == NULL) {
33716956	528	err("failed to open: %s: ", table_fname);
47bf65ab	529	perror(NULL);
	530	goto fail_img;
	531	}
	532	fclose(f);
	533
33716956	534	printf(PFX "Loaded compressed CD Image: %s.\n", cd_fname);
47bf65ab	535
	536	return 0;
	537
	538	fail_img:
	539	fail_table_io_read:
	540	free(cd_index_table);
	541	cd_index_table = NULL;
	542	fail_table_io:
	543	fclose(f);
	544	return -1;
	545	}
	546
	547	#define FUNC(n) { #n, n }
	548
	549	static const struct {
	550	const char *name;
	551	void *func;
	552	} plugin_funcs[] = {
	553	/* CDR */
	554	FUNC(CDRinit),
	555	FUNC(CDRshutdown),
	556	FUNC(CDRopen),
	557	FUNC(CDRclose),
	558	FUNC(CDRgetTN),
	559	FUNC(CDRgetTD),
	560	FUNC(CDRreadTrack),
	561	FUNC(CDRgetBuffer),
	562	FUNC(CDRgetBufferSub),
	563	FUNC(CDRplay),
	564	FUNC(CDRstop),
	565	FUNC(CDRgetStatus),
	566	};
	567
	568	void cdrcimg_set_fname(const char *fname)
	569	{
	570	cd_fname = fname;
	571	}
	572
	573	void cdrcimg_get_sym(const char sym)
	574	{
	575	int i;
	576	for (i = 0; i < sizeof(plugin_funcs) / sizeof(plugin_funcs[0]); i++)
	577	if (strcmp(plugin_funcs[i].name, sym) == 0)
	578	return plugin_funcs[i].func;
	579	return NULL;
	580	}
	581