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RetroArch/libretro-common/media/media_detect_cd.c
Brad Parker a191112634 cdrom: add PC Engine CD detection
2019-07-29 15:11:28 -04:00

282 lines
9.3 KiB
C
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/* Copyright (C) 2010-2019 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (media_detect_cd.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <media/media_detect_cd.h>
#include <streams/file_stream.h>
#include <string/stdstring.h>
static void media_zero_trailing_spaces(char *buf, size_t len)
{
int i;
for (i = len - 1; i >= 0; i--)
{
if (buf[i] == ' ')
buf[i] = '\0';
else if (buf[i] != '\0')
break;
}
}
static bool media_skip_spaces(const char **buf, size_t len)
{
bool found = false;
unsigned i;
if (!buf || !*buf)
return false;
for (i = 0; i < len; i++)
{
if ((*buf)[i] == ' ')
continue;
*buf += i;
found = true;
break;
}
if (found)
return true;
return false;
}
bool media_detect_cd_info(const char *path, media_detect_cd_info_t *info)
{
RFILE *file;
if (string_is_empty(path) || !info)
return false;
file = filestream_open(path, RETRO_VFS_FILE_ACCESS_READ, 0);
if (!file)
{
printf("[MEDIA] Could not open path for reading: %s\n", path);
fflush(stdout);
return false;
}
{
unsigned offset = 0;
unsigned sector_size = 0;
unsigned buf_size = 17 * 2352;
char *buf = (char*)calloc(1, buf_size);
int64_t read_bytes = 0;
if (!buf)
return false;
read_bytes = filestream_read(file, buf, buf_size);
if (read_bytes != buf_size)
{
printf("[MEDIA] Could not read from media.\n");
fflush(stdout);
filestream_close(file);
free(buf);
return false;
}
/* 12-byte sync field at the start of every sector, common to both mode1 and mode2 data tracks
* (when at least sync data is requested). This is a CD-ROM standard feature and not specific to any game devices,
* and as such should not be part of any system-specific detection or "magic" bytes.
* Depending on what parts of a sector were requested from the disc, the user data might start at
* byte offset 0, 4, 8, 12, 16 or 24. Cue sheets only specify the total number of bytes requested from the sectors
* of a track (like 2048 or 2352) and it is then assumed based on the size/mode as to what fields are present. */
if (!memcmp(buf, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", 12))
{
/* Assume track data contains all fields. */
sector_size = 2352;
if (buf[15] == 2)
{
/* assume Mode 2 formed (formless is rarely used) */
offset = 24;
}
else
{
/* assume Mode 1 */
offset = 16;
}
}
else
{
/* Assume sectors only contain user data instead. */
offset = 0;
sector_size = 2048;
}
if (!memcmp(buf + offset, "SEGADISCSYSTEM", strlen("SEGADISCSYSTEM")))
{
const char *title_pos;
const char *serial_pos;
bool title_found = false;
/* All discs currently in Redump for MCD start with SEGADISCSYSTEM. There are other strings mentioned elsewhere online,
* but I have not seen any real examples of them. */
info->system_id = MEDIA_CD_SYSTEM_MEGA_CD;
strlcpy(info->system, "Sega CD / Mega CD", sizeof(info->system));
title_pos = buf + offset + 0x150;
if (media_skip_spaces(&title_pos, 48))
{
memcpy(info->title, title_pos, 48 - (title_pos - (buf + offset + 0x150)));
media_zero_trailing_spaces(info->title, sizeof(info->title));
}
else
strlcpy(info->title, "N/A", sizeof(info->title));
serial_pos = buf + offset + 0x183;
if (media_skip_spaces(&serial_pos, 8))
memcpy(info->serial, serial_pos, 8 - (serial_pos - (buf + offset + 0x183)));
else
strlcpy(info->serial, "N/A", sizeof(info->serial));
}
else if (!memcmp(buf + offset, "SEGA SEGASATURN", strlen("SEGA SEGASATURN")))
{
const char *title_pos;
const char *serial_pos;
const char *version_pos;
const char *release_date_pos;
bool title_found = false;
info->system_id = MEDIA_CD_SYSTEM_SATURN;
strlcpy(info->system, "Sega Saturn", sizeof(info->system));
title_pos = buf + offset + 0x60;
if (media_skip_spaces(&title_pos, 112))
{
memcpy(info->title, title_pos, 112 - (title_pos - (buf + offset + 0x60)));
media_zero_trailing_spaces(info->title, sizeof(info->title));
}
else
strlcpy(info->title, "N/A", sizeof(info->title));
serial_pos = buf + offset + 0x20;
if (media_skip_spaces(&serial_pos, 10))
memcpy(info->serial, serial_pos, 10 - (serial_pos - (buf + offset + 0x20)));
else
strlcpy(info->serial, "N/A", sizeof(info->serial));
version_pos = buf + offset + 0x2a;
if (media_skip_spaces(&version_pos, 6))
memcpy(info->version, version_pos, 6 - (version_pos - (buf + offset + 0x2a)));
else
strlcpy(info->version, "N/A", sizeof(info->version));
release_date_pos = buf + offset + 0x30;
if (media_skip_spaces(&release_date_pos, 8))
memcpy(info->release_date, release_date_pos, 8 - (release_date_pos - (buf + offset + 0x30)));
else
strlcpy(info->release_date, "N/A", sizeof(info->release_date));
}
else if (!memcmp(buf + offset, "SEGA SEGAKATANA", strlen("SEGA SEGAKATANA")))
{
const char *title_pos;
const char *serial_pos;
const char *version_pos;
const char *release_date_pos;
bool title_found = false;
info->system_id = MEDIA_CD_SYSTEM_DREAMCAST;
strlcpy(info->system, "Sega Dreamcast", sizeof(info->system));
title_pos = buf + offset + 0x80;
if (media_skip_spaces(&title_pos, 96))
{
memcpy(info->title, title_pos, 96 - (title_pos - (buf + offset + 0x80)));
media_zero_trailing_spaces(info->title, sizeof(info->title));
}
else
strlcpy(info->title, "N/A", sizeof(info->title));
serial_pos = buf + offset + 0x40;
if (media_skip_spaces(&serial_pos, 10))
memcpy(info->serial, serial_pos, 10 - (serial_pos - (buf + offset + 0x40)));
else
strlcpy(info->serial, "N/A", sizeof(info->serial));
version_pos = buf + offset + 0x4a;
if (media_skip_spaces(&version_pos, 6))
memcpy(info->version, version_pos, 6 - (version_pos - (buf + offset + 0x4a)));
else
strlcpy(info->version, "N/A", sizeof(info->version));
release_date_pos = buf + offset + 0x50;
if (media_skip_spaces(&release_date_pos, 8))
memcpy(info->release_date, release_date_pos, 8 - (release_date_pos - (buf + offset + 0x50)));
else
strlcpy(info->release_date, "N/A", sizeof(info->release_date));
}
/* Primary Volume Descriptor fields of ISO9660 */
else if (!memcmp(buf + offset + (16 * sector_size), "\1CD001\1\0PLAYSTATION", 19))
{
const char *title_pos = NULL;
bool title_found = false;
info->system_id = MEDIA_CD_SYSTEM_PSX;
strlcpy(info->system, "Sony PlayStation", sizeof(info->system));
title_pos = buf + offset + (16 * sector_size) + 40;
if (media_skip_spaces(&title_pos, 32))
memcpy(info->title, title_pos, 32 - (title_pos - (buf + offset + (16 * sector_size) + 40)));
else
strlcpy(info->title, "N/A", sizeof(info->title));
}
else if (!memcmp(buf + offset, "\x01\x5a\x5a\x5a\x5a\x5a\x01\x00\x00\x00\x00\x00", 12))
{
info->system_id = MEDIA_CD_SYSTEM_3DO;
strlcpy(info->system, "3DO", sizeof(info->system));
}
else if (!memcmp(buf + offset + 0x950, "PC Engine CD-ROM SYSTEM", 23))
{
info->system_id = MEDIA_CD_SYSTEM_PC_ENGINE_CD;
strlcpy(info->system, "TurboGrafx-CD / PC-Engine CD", sizeof(info->system));
}
free(buf);
}
filestream_close(file);
return true;
}
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