From 3444540e2c8a7f45c25dbcc0e7a86513cca1c380 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Sun, 22 Jun 2025 18:50:27 +0100
Subject: [PATCH] Add pattern for Alcohol 120% disc images.

---
 optical/Alcohol.hexpat | 173 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 optical/Alcohol.hexpat

diff --git a/optical/Alcohol.hexpat b/optical/Alcohol.hexpat
new file mode 100644
index 0000000..c7feabe
--- /dev/null
+++ b/optical/Alcohol.hexpat
@@ -0,0 +1,173 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : Alcohol.hexpat
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : ImHex pattern for parsing Alcohol 120% disc images.
+// Version        : 1.00
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Parses Alcohol 120% disc images.
+//
+// --[ History ] --------------------------------------------------------------
+//     
+//     1.00: Initial release.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This program 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 3 of the
+//     License, or (at your option) any later version.
+//
+//     This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2025 Natalia Portillo
+// Copyright © 2020 RibShark
+// ****************************************************************************/
+
+#pragma author Nat Portillo <claunia@claunia.com>
+#pragma description Alcohol 120% parser (*.mds)
+#pragma endian little
+#pragma magic [ "MEDIA DESCRIPTOR" ] @ 0x00
+
+import type.magic;
+import std.string;
+
+enum medium_type_t : u16
+{
+    CD = 0x00,
+    CDR = 0x01,
+    CDRW = 0x02,
+    DVD = 0x10,
+    DVDR = 0x12
+};
+
+enum track_mode_t : u8
+{
+    NoData = 0x00,
+    Data = 0x02,
+    Audio = 0xA9,
+    Mode1 = 0xAA,
+    Mode2 = 0xAB,
+    Mode2F1 = 0xEC,
+    Mode2F2 = 0xED,
+    Mode2F1Alt = 0xAC,
+    Mode2F2Alt = 0xAD,
+};
+
+enum subchannel_mode_t : u8
+{
+    None = 0x00,
+    Interleaved = 0x08
+};
+
+struct alc_dpm_t
+{
+    u32 unknown;  // 0x01
+    u32 unknown2; // 0x1FC
+    u32 unknown3; // 0x01
+    u32 start_sector; // 0x00
+    u32 resolution;
+    u32 count;
+    u32 entries[count];
+};
+
+struct alc_footer_t
+{
+    u32 filename_off;
+    u32 widechar;
+    u32 unknown1;
+    u32 unknown2;
+};
+
+struct alc_extra_t
+{
+    u32 pregap;
+    u32 sectors;
+};
+
+struct alc_track_t
+{
+    track_mode_t mode;
+    subchannel_mode_t subMode;
+    u8 adr_ctrl;
+    u8 tno;
+    u8 point;
+    u8 min;
+    u8 sec;
+    u8 frame;
+    u8 zero;
+    u8 pmin;
+    u8 psec;
+    u8 pframe;
+    u32 extra_off;
+    u16 sector_size;
+    u8 unknown[18];
+    u32 start_lba;
+    u64 start_off;
+    u32 files;
+    u32 footer_off;
+    u8 unknown2[24];
+
+    if(extra_off > 0)
+        alc_extra_t extra @ extra_off;
+};
+
+struct alc_session_t
+{
+    s32 start;
+    s32 end;
+    u16 sequence;
+    u8 all_blocks;
+    u8 non_track_blocks;
+    u16 first_track;
+    u16 last_track;
+    u32 unknown;
+    u32 track_off;
+    alc_track_t tracks[this.all_blocks] @ track_off;
+};
+
+struct alc_header_t
+{
+    type::Magic<"MEDIA DESCRIPTOR"> magic;
+    u8 major_version;
+    u8 minor_version;
+    medium_type_t type;
+    u16 sessions;
+    u16 unknown1[2];
+    u16 bca_len;
+    u32 unknown2[2];
+    u32 bca_off;
+    u32 unknown3[6];
+    u32 structures_off;
+    u32 unknown4[3];
+    u32 session_off;
+    u32 dpm_off;
+};
+
+alc_header_t header @ 0x00;
+alc_session_t sessions[header.sessions] @ header.session_off;
+
+if(sessions[0].tracks[3].footer_off > 0)
+{
+    alc_footer_t footer @ sessions[0].tracks[3].footer_off;
+    
+    if(footer.widechar > 0)
+        std::string::NullString16 filename @ footer.filename_off;
+    else
+        std::string::NullString filename @ footer.filename_off;
+}
+
+if(header.dpm_off > 0)
+    alc_dpm_t dpm @ header.dpm_off;
\ No newline at end of file