From 2a1f3fd84c80e24057097974895056708019eca6 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Sun, 22 Jun 2025 17:02:56 +0100
Subject: [PATCH] Add pattern for BlindWrite 4 disc images.

---
 optical/BlindWrite4.hexpat | 138 +++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 optical/BlindWrite4.hexpat

diff --git a/optical/BlindWrite4.hexpat b/optical/BlindWrite4.hexpat
new file mode 100644
index 0000000..ab81a28
--- /dev/null
+++ b/optical/BlindWrite4.hexpat
@@ -0,0 +1,138 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : BlindWrite4.hexpat
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : ImHex pattern for parsing BlindWrite 4 disc images.
+// Version        : 1.00
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Parses BlindWrite 4 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
+// ****************************************************************************/
+
+#pragma author Nat Portillo <claunia@claunia.com>
+#pragma description BlindWrite 4 disc images parser (*.BWT)
+#pragma endian little
+#pragma magic [ "BLINDWRITE TOC FILE" ] @ 0x00
+
+import type.magic;
+
+enum bw4_track_mode_t : u8
+{
+    Audio = 0,
+    Mode1 = 1,
+    Mode2 = 2
+};
+
+bitfield CtrlAdr
+{
+    CONTROL : 4;
+    ADR : 4;
+};
+
+struct bw4_track_t
+{
+    u32 filename_len;
+    char filename[filename_len] [[name("Filename")]];
+    u32 offset [[name("Track offset in file")]];
+    u8 subchannel [[name("Subchannel reading mode")]];
+    u8 unknown1[3];
+    u32 unknown2;
+    u8 unknown3;
+    u8 session;
+    u8 unknown4;
+    CtrlAdr;
+    u8 unknown5;
+    bw4_track_mode_t track_mode [[name("Track mode")]];
+    u8 unknown6;
+    u8 point [[name("Track point")]];
+    u32 unknown7;
+    u32 unknown8;
+    u32 unknown9;
+    u32 unknown10;
+    u16 unknown11;
+    s32 lastSector [[name("Last sector")]];
+    s8 unknown12;
+    s32 pregap [[name("Track pregap")]];
+    s32 startSector [[name("Track starting sector (index 1)")]];
+    u32 unknown13[2];
+    u32 title_len;
+    char title[title_len] [[name("Album title")]];
+    u32 performer_len;
+    char performer[performer_len] [[name("Album performer")]];
+    u32 unknown14_len;
+    char unknown14[unknown14_len];
+    u32 unknown15_len;
+    char unknown15[unknown15_len];
+    u32 unknown16_len;
+    char unknown16[unknown16_len];
+    u32 unknown17_len;
+    char unknown17[unknown17_len];
+    u32 disc_id_len;
+    char disc_id[disc_id_len] [[name("Disc ID from CD-Text")]];
+    u32 unknown18_len;
+    char unknown18[unknown18_len];
+    u32 unknown19_len;
+    char unknown19[unknown19_len];
+    u32 unknown20_len;
+    char unknown20[unknown20_len];
+    u32 unknown21_len;
+    char unknown21[unknown21_len];
+    u32 unknown22_len;
+    char unknown22[unknown22_len];
+    u32 unknown23_len;
+    char unknown23[unknown23_len];
+    u32 unknown24_len;
+    char unknown24[unknown24_len];
+    u32 isrc_len;
+    char isrc[isrc_len] [[name("ISRC")]];
+};
+
+struct bw4_header_t
+{
+    type::Magic<"BLINDWRITE TOC FILE"> magic;
+    u32 unknown1 [[highlight_hidden]];
+    u64 timestamp;
+    u32 volid_len;
+    char volume_id[volid_len] [[name("Volume identifier")]];
+    u32 sysid_len;
+    char system_id[sysid_len] [[name("System identifier")]];
+    u32 comments_len;
+    char comments[comments_len] [[name("Image comments")]];
+    u32 track_descriptors;
+    u32 data_file_len;
+    char data_file[data_file_len] [[name("Data file")]];
+    u32 subchannel_file_len;
+    char subchannel_file[subchannel_file_len] [[name("Subchannel file")]];
+    u32 unknown2 [[highlight_hidden]];
+    u8 unknown3_len [[highlight_hidden]];
+    char unknown3[unknown3_len] [[highlight_hidden]];
+    bw4_track_t tracks[track_descriptors];
+};
+
+bw4_header_t header @ 0x00;
\ No newline at end of file