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isofs.c
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isofs.c
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/*
* isofs.c
* $Id: isofs.c,v 1.11 2006/09/01 17:23:22 bobi Exp $
*
* Copyright 2004 Bobi B., [email protected]
*
* This file is part of hdl_dump.
*
* hdl_dump is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* hdl_dump is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with hdl_dump; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <ctype.h>
#include <string.h>
#include "isofs.h"
#include "retcodes.h"
#include "common.h"
#define CDVD_SECT_SIZE 2048
/**************************************************************/
/*
* pvd == "Primary Volume Descriptor"
* ptr == "Path Table Record"
*/
static int
isofs_find_pvd_addr(iin_t *iin,
/*@out@*/ u_int64_t *pvd_start_addr,
/*@out@*/ u_int64_t *ptr_start_addr,
/*@out@*/ char system_id[32 + 1],
/*@out@*/ char volume_id[32 + 1],
int layer)
{
u_int32_t start_sector = 16;
const char *data;
u_int32_t len;
const unsigned char *buffer;
int result = iin->read(iin, start_sector, 1, &data, &len);
buffer = (const unsigned char *)data;
*pvd_start_addr = *ptr_start_addr = 0;
*system_id = *volume_id = '\0';
if (result == OSAL_OK)
result = memcmp(buffer + 1, "CD001", 5) == 0 ? OSAL_OK : RET_BAD_ISOFS;
if (layer == 1) {
start_sector = ((u_int32_t)buffer[83] << 24 |
(u_int32_t)buffer[82] << 16 |
(u_int32_t)buffer[81] << 8 |
(u_int32_t)buffer[80] << 0);
result = iin->read(iin, start_sector, 1, &data, &len);
if (len != 2048)
result = RET_BAD_ISOFS;
if (result == OSAL_OK) {
buffer = (const unsigned char *)data;
result = (memcmp(buffer + 1, "CD001", 5) == 0 ?
OSAL_OK :
RET_BAD_ISOFS);
}
}
if (result == OSAL_OK) {
if (buffer[0] == 0x01) /* primary volume descriptor set */
{
*pvd_start_addr = start_sector * IIN_SECTOR_SIZE;
*ptr_start_addr = (u_int64_t)(buffer[143] << 24 |
buffer[142] << 16 |
buffer[141] << 8 |
buffer[140] << 0) *
(u_int64_t)CDVD_SECT_SIZE;
if (system_id != NULL) {
memcpy(system_id, buffer + 8, 32);
system_id[32] = '\0';
(void)rtrim(system_id);
}
if (volume_id != NULL) {
memcpy(volume_id, buffer + 40, 32);
volume_id[32] = '\0';
(void)rtrim(volume_id);
}
} else
result = RET_BAD_ISOFS; /* primary volume descriptor set not found */
}
return (result);
}
/**************************************************************/
static int
isofs_get_root_addr(iin_t *iin,
u_int64_t ptr_start_addr,
/*@out@*/ u_int64_t *root_start_addr)
{
u_int32_t len;
const char *data;
int result = iin->read(iin, (u_int32_t)(ptr_start_addr / IIN_SECTOR_SIZE),
1, &data, &len);
const unsigned char *buffer = (const unsigned char *)data;
*root_start_addr = 0;
if (result == OSAL_OK) {
int found = 0;
u_int32_t dir_start_addr;
const unsigned char *p = buffer;
do {
int id_len;
u_int16_t parent_dir;
id_len = *p++;
if (id_len == 0 ||
p > buffer + 2047)
break; /* last entry */
p++;
dir_start_addr = ((u_int32_t)p[3] << 24 |
(u_int32_t)p[2] << 16 |
(u_int32_t)p[1] << 8 |
(u_int32_t)p[0] << 0);
p += 4;
parent_dir = (u_int16_t)p[1] << 8 | (u_int16_t)p[0];
p += 2;
if (*p == '\0') { /* root dir? */
found = 1;
break;
} else
p += id_len + (id_len % 2); /* skip to next entry */
} while (1);
if (found)
*root_start_addr = (u_int64_t)dir_start_addr * CDVD_SECT_SIZE;
else
result = RET_BAD_ISOFS; /* root dir not found */
}
return (result);
}
/**************************************************************/
static int
isofs_get_file_addr(iin_t *iin,
u_int64_t dir_start_addr,
const char *file_name,
/*@out@*/ u_int64_t *file_start_addr,
/*@out@*/ u_int64_t *file_length)
{
u_int32_t file_name_len = strlen(file_name);
u_int32_t len;
const char *data;
int result = iin->read(iin, (u_int32_t)(dir_start_addr / IIN_SECTOR_SIZE),
1, &data, &len);
const unsigned char *buffer = (const unsigned char *)data;
*file_start_addr = *file_length = 0;
if (result == OSAL_OK) {
int found = 0;
u_int32_t start_addr, length;
const unsigned char *p = buffer;
do {
int len_dr;
u_int32_t name_len;
const unsigned char *start = p;
len_dr = *p++;
if (len_dr == 0 ||
p > buffer + 2047)
break; /* last entry */
p++;
start_addr = ((u_int32_t)p[3] << 24 |
(u_int32_t)p[2] << 16 |
(u_int32_t)p[1] << 8 |
(u_int32_t)p[0] << 0);
p += 8;
length = ((u_int32_t)p[3] << 24 |
(u_int32_t)p[2] << 16 |
(u_int32_t)p[1] << 8 |
(u_int32_t)p[0] << 0);
p += 8;
p += 7; /* recording date/time */
++p;
++p;
++p;
p += 4; /* flags, unit size, intereave gap size, volume seq no */
name_len = *p++;
if ((name_len == file_name_len) && (memcmp(p, file_name, file_name_len) == 0)) { /* found */
found = 1;
break;
} else
p = start + len_dr; /* continue to the next file */
} while (1);
if (found) {
*file_start_addr = (u_int64_t)start_addr * CDVD_SECT_SIZE;
*file_length = length;
} else
result = RET_NOT_FOUND;
}
return (result);
}
/**************************************************************/
static int
parse_config_cnf(const char *contents,
u_int32_t length,
/*@out@*/ char signature[12 + 1])
{
/* when using memory-mapped I/O buffer is read-only */
char buf[131072];
int found = 0;
char *line = buf;
const char *end = buf + length;
*signature = '\0';
if (length <= sizeof(buf))
memcpy(buf, contents, length);
else
return (RET_NOT_PS_CDVD);
do {
char *p = line, *start = line;
while (*p != '\r' && *p != '\n' && p < end && *p != '\0')
++p;
*p = '\0';
line = p + 1;
/* expected format: "BOOT2 = cdrom0:\SCES_xxx.xx;1\r\n" */
p = start;
if (memcmp(p, "BOOT2", 5) == 0) {
p += 5;
while (*p == ' ' || *p == '\t' || *p == '=')
++p;
if ((memcmp(p, "cdrom0:\\", 8) == 0) || (memcmp(p, "cdrom1:\\", 8) == 0)) { /*cdrom1 is used by some game mods*/
p += 8;
while (*p != ';')
*signature++ = *p++;
*signature = '\0';
found = 1;
break;
}
}
} while (line < end);
return (found ? OSAL_OK : RET_NOT_PS_CDVD /* perhaps PSOne CD-ROM */);
}
/**************************************************************/
static int
isofs_parse_config_cnf(iin_t *iin,
u_int64_t file_start_addr,
u_int64_t file_length,
/*@out@*/ char signature[12 + 1])
{
u_int32_t len;
const char *data;
int result = iin->read(iin, (u_int32_t)(file_start_addr / IIN_SECTOR_SIZE),
1, &data, &len);
*signature = '\0';
if (result == OSAL_OK)
result = parse_config_cnf(data, (u_int32_t)file_length, signature);
return (result);
}
/**************************************************************/
static int
isofs_detect_media_type(iin_t *iin,
/*@out@*/ ps2_cdvd_info_t *info)
{
const char *buf = NULL;
u_int32_t len = 0;
int result = iin->read(iin, 16, 1, &buf, &len);
if (result == OSAL_OK && len == CDVD_SECT_SIZE) {
if (memcmp(buf + 1024, "CD-XA001", 8) == 0)
info->media_type = mt_cd;
else if (memcmp(buf + 1024, "\0\0\0\0\0\0\0\0", 8) == 0)
info->media_type = mt_dvd;
else
info->media_type = mt_unknown;
}
return (result);
}
/**************************************************************/
int isofs_get_ps2_cdvd_info(iin_t *iin,
ps2_cdvd_info_t *info)
{
u_int64_t pvd_start_addr, ptr_start_addr, root_start_addr;
u_int64_t system_cnf_start_addr, system_cnf_length;
char system_id[32 + 1];
int result;
result = isofs_detect_media_type(iin, info);
if (result == OSAL_OK)
result = isofs_find_pvd_addr(iin, &pvd_start_addr, &ptr_start_addr,
system_id, info->volume_id, 0);
if (result == OSAL_OK)
if (strcmp(system_id, "PLAYSTATION") != 0)
result = RET_NOT_PS_CDVD;
if (result == OSAL_OK)
result = isofs_get_root_addr(iin, ptr_start_addr, &root_start_addr);
if (result == OSAL_OK)
result = isofs_get_file_addr(iin, root_start_addr, "SYSTEM.CNF;1",
&system_cnf_start_addr, &system_cnf_length);
if (result == OSAL_OK)
result = isofs_parse_config_cnf(iin, system_cnf_start_addr,
system_cnf_length, info->startup_elf);
if (result == OSAL_OK) {
char tmp_volume_id[32 + 1];
if (isofs_find_pvd_addr(iin, &pvd_start_addr, &ptr_start_addr,
system_id, tmp_volume_id, 1) == OSAL_OK)
info->layer_pvd = pvd_start_addr / CDVD_SECT_SIZE;
else
info->layer_pvd = 0;
}
return (result);
}