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376b62e8fa
RetroArch/libretro-common/media/media_detect_cd.c
twinaphex 376b62e8fa Cut down on more unnecessary strlens
2020-05-24 17:25:52 +02:00

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/* Copyright (C) 2010-2020 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>
#include <file/file_path.h>
#include <retro_miscellaneous.h>
/*#define MEDIA_CUE_PARSE_DEBUG*/
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 || !**buf)
return false;
for (i = 0; i < len; i++)
{
if ((*buf)[i] == ' ' || (*buf)[i] == '\t')
continue;
*buf += i;
found = true;
break;
}
if (found)
return true;
return false;
}
/* Fill in "info" with detected CD info. Use this when you have a cue file and want it parsed to find the first data track and any pregap info. */
bool media_detect_cd_info_cue(const char *path, media_detect_cd_info_t *info)
{
RFILE *file = NULL;
char *line = NULL;
char track_path[PATH_MAX_LENGTH] = {0};
char track_abs_path[PATH_MAX_LENGTH] = {0};
char track_mode[11] = {0};
bool found_file = false;
bool found_track = false;
unsigned first_data_track = 0;
uint64_t data_track_pregap_bytes = 0;
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 cue path for reading: %s\n", path);
fflush(stdout);
return false;
}
while (!filestream_eof(file) && (line = filestream_getline(file)))
{
size_t len = 0;
const char *command = NULL;
if (string_is_empty(line))
{
free(line);
continue;
}
len = strlen(line);
command = line;
media_skip_spaces(&command, len);
if (!found_file && !strncasecmp(command, "FILE", 4))
{
const char *file = command + 4;
media_skip_spaces(&file, len - 4);
if (!string_is_empty(file))
{
const char *file_end = NULL;
size_t file_len = 0;
bool quoted = false;
if (file[0] == '"')
{
quoted = true;
file++;
}
if (quoted)
file_end = strchr(file, '\"');
else
file_end = strchr(file, ' ');
if (file_end)
{
file_len = file_end - file;
memcpy(track_path, file, file_len);
found_file = true;
#ifdef MEDIA_CUE_PARSE_DEBUG
printf("Found file: %s\n", track_path);
fflush(stdout);
#endif
}
}
}
else if (found_file && !found_track && !strncasecmp(command, "TRACK", 5))
{
const char *track = command + 5;
media_skip_spaces(&track, len - 5);
if (!string_is_empty(track))
{
unsigned track_number = 0;
sscanf(track, "%d", &track_number);
#ifdef MEDIA_CUE_PARSE_DEBUG
printf("Found track: %d\n", track_number);
fflush(stdout);
#endif
track++;
if (track[0] && track[0] != ' ' && track[0] != '\t')
track++;
if (!string_is_empty(track))
{
media_skip_spaces(&track, strlen(track));
#ifdef MEDIA_CUE_PARSE_DEBUG
printf("Found track type: %s\n", track);
fflush(stdout);
#endif
if (!strncasecmp(track, "MODE", 4))
{
first_data_track = track_number;
found_track = true;
strlcpy(track_mode, track, sizeof(track_mode));
}
else
found_file = false;
}
}
}
else if (found_file && found_track && first_data_track && !strncasecmp(command, "INDEX", 5))
{
const char *index = command + 5;
media_skip_spaces(&index, len - 5);
if (!string_is_empty(index))
{
unsigned index_number = 0;
sscanf(index, "%d", &index_number);
if (index_number == 1)
{
const char *pregap = index + 1;
if (pregap[0] && pregap[0] != ' ' && pregap[0] != '\t')
pregap++;
if (!string_is_empty(pregap))
{
media_skip_spaces(&pregap, strlen(pregap));
found_file = false;
found_track = false;
if (first_data_track && !string_is_empty(track_mode))
{
unsigned track_sector_size = 0;
unsigned track_mode_number = 0;
if (strlen(track_mode) == 10)
{
sscanf(track_mode, "MODE%d/%d", &track_mode_number, &track_sector_size);
#ifdef MEDIA_CUE_PARSE_DEBUG
printf("Found track mode %d with sector size %d\n", track_mode_number, track_sector_size);
fflush(stdout);
#endif
if ((track_mode_number == 1 || track_mode_number == 2) && track_sector_size)
{
unsigned min = 0;
unsigned sec = 0;
unsigned frame = 0;
sscanf(pregap, "%02d:%02d:%02d", &min, &sec, &frame);
if (min || sec || frame || strstr(pregap, "00:00:00"))
{
data_track_pregap_bytes = ((min * 60 + sec) * 75 + frame) * track_sector_size;
#ifdef MEDIA_CUE_PARSE_DEBUG
printf("Found pregap of %02d:%02d:%02d (bytes: %" PRIu64 ")\n", min, sec, frame, data_track_pregap_bytes);
fflush(stdout);
#endif
break;
}
}
}
}
}
}
}
}
free(line);
}
filestream_close(file);
if (!string_is_empty(track_path))
{
if (strstr(track_path, "/") || strstr(track_path, "\\"))
{
printf("using path %s\n", track_path);
fflush(stdout);
return media_detect_cd_info(track_path, data_track_pregap_bytes, info);
}
else
{
fill_pathname_basedir(track_abs_path, path, sizeof(track_abs_path));
strlcat(track_abs_path, track_path, sizeof(track_abs_path));
printf("using abs path %s\n", track_abs_path);
fflush(stdout);
return media_detect_cd_info(track_abs_path, data_track_pregap_bytes, info);
}
}
return true;
}
/* Fill in "info" with detected CD info. Use this when you want to open a specific track file directly, and the pregap is known. */
bool media_detect_cd_info(const char *path, uint64_t pregap_bytes, 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;
if (pregap_bytes)
filestream_seek(file, pregap_bytes, RETRO_VFS_SEEK_POSITION_START);
read_bytes = filestream_read(file, buf, buf_size);
if (read_bytes != buf_size)
{
printf("[MEDIA] Could not read from media: got %" PRId64 " bytes instead of %d.\n", read_bytes, buf_size);
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_CONST("SEGADISCSYSTEM")))
{
const char *title_pos = NULL;
const char *serial_pos = NULL;
#if 0
bool title_found = false;
#endif
/* 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)));
media_zero_trailing_spaces(info->serial, sizeof(info->serial));
}
else
strlcpy(info->serial, "N/A", sizeof(info->serial));
}
else if (!memcmp(buf + offset, "SEGA SEGASATURN",
STRLEN_CONST("SEGA SEGASATURN")))
{
const char *title_pos = NULL;
const char *serial_pos = NULL;
const char *version_pos = NULL;
const char *release_date_pos = NULL;
#if 0
bool title_found = false;
#endif
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)));
media_zero_trailing_spaces(info->serial, sizeof(info->serial));
}
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)));
media_zero_trailing_spaces(info->version, sizeof(info->version));
}
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)));
media_zero_trailing_spaces(info->release_date, sizeof(info->release_date));
}
else
strlcpy(info->release_date, "N/A", sizeof(info->release_date));
}
else if (!memcmp(buf + offset, "SEGA SEGAKATANA", STRLEN_CONST("SEGA SEGAKATANA")))
{
const char *title_pos = NULL;
const char *serial_pos = NULL;
const char *version_pos = NULL;
const char *release_date_pos = NULL;
#if 0
bool title_found = false;
#endif
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)));
media_zero_trailing_spaces(info->serial, sizeof(info->serial));
}
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)));
media_zero_trailing_spaces(info->version, sizeof(info->version));
}
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)));
media_zero_trailing_spaces(info->release_date, sizeof(info->release_date));
}
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;
#if 0
bool title_found = false;
#endif
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)));
media_zero_trailing_spaces(info->title, sizeof(info->title));
}
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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