From 8fb732cc601fd9f9fdd8b25a21d4e939ce78b478 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Mon, 9 Oct 2017 12:31:39 +0100
Subject: [PATCH] Add support for Amiga extensions to ISO9660.

---
 DiscImageChef.Filesystems/ISO9660/Consts.cs  | 35 ++++++++++++++++++++
 DiscImageChef.Filesystems/ISO9660/Info.cs    |  3 ++
 DiscImageChef.Filesystems/ISO9660/Structs.cs | 20 +++++++++++
 3 files changed, 58 insertions(+)

diff --git a/DiscImageChef.Filesystems/ISO9660/Consts.cs b/DiscImageChef.Filesystems/ISO9660/Consts.cs
index d0c859701..6509dd3f1 100644
--- a/DiscImageChef.Filesystems/ISO9660/Consts.cs
+++ b/DiscImageChef.Filesystems/ISO9660/Consts.cs
@@ -63,6 +63,7 @@ namespace DiscImageChef.Filesystems.ISO9660
         const ulong ziso_header_cigam = 0x07D6DBC99653E437;
         const ushort ziso_Magic = 0x5A46; // "ZF"
         const ushort ziso_PagedZlib = 0x707A; // "pz"
+        const ushort Amiga_Magic = 0x4153; // "AS"
 
         [Flags]
         enum FileFlags : byte
@@ -232,5 +233,39 @@ namespace DiscImageChef.Filesystems.ISO9660
             Effective = 1 << 6,
             LongFormat = 1 << 7,
         }
+
+        [Flags]
+        enum AmigaFlags : byte
+        {
+            Protection = 1 << 0,
+            Comment = 1 << 1,
+            CommentContinues = 1 << 2
+        }
+
+        [Flags]
+        enum AmigaMultiuser : byte
+        {
+            GroupDelete = 1 << 0,
+            GroupExec = 1 << 1,
+            GroupWrite = 1 << 2,
+            GroupRead = 1 << 3,
+            OtherDelete = 1 << 4,
+            OtherExec = 1 << 5,
+            OtherWrite = 1 << 6,
+            OtherRead = 1 << 7,
+        }
+
+        [Flags]
+        enum AmigaAttributes : byte
+        {
+            OwnerDelete = 1 << 0,
+            OwnerExec = 1 << 1,
+            OwnerWrite = 1 << 2,
+            OwnerRead = 1 << 3,
+            Archive = 1 << 4,
+            Reentrant = 1 << 5,
+            Script = 1 << 6,
+            Reserved = 1 << 7,
+        }
     }
 }
diff --git a/DiscImageChef.Filesystems/ISO9660/Info.cs b/DiscImageChef.Filesystems/ISO9660/Info.cs
index 8197f2b97..035869322 100644
--- a/DiscImageChef.Filesystems/ISO9660/Info.cs
+++ b/DiscImageChef.Filesystems/ISO9660/Info.cs
@@ -258,6 +258,7 @@ namespace DiscImageChef.Filesystems.ISO9660
             bool SUSP = false;
             bool RRIP = false;
             bool ziso = false;
+            bool Amiga = false;
             List<ContinuationArea> contareas = new List<ContinuationArea>();
             List<byte[]> refareas = new List<byte[]>();
             StringBuilder suspInformation = new StringBuilder();
@@ -378,6 +379,7 @@ namespace DiscImageChef.Filesystems.ISO9660
                                             nextSignature == RRIP_Timestamps || nextSignature == RRIP_Sparse;
 
                                 ziso |= nextSignature == ziso_Magic;
+                                Amiga |= nextSignature == Amiga_Magic;
 
                                 sa_off += sa[sa_off + 2];
 
@@ -435,6 +437,7 @@ namespace DiscImageChef.Filesystems.ISO9660
                                 nextSignature == RRIP_Timestamps || nextSignature == RRIP_Sparse;
 
                     ziso |= nextSignature == ziso_Magic;
+                    Amiga |= nextSignature == Amiga_Magic;
 
                     ca_off += ca_data[ca_off + 2];
                 }
diff --git a/DiscImageChef.Filesystems/ISO9660/Structs.cs b/DiscImageChef.Filesystems/ISO9660/Structs.cs
index 35c63f90c..8537ce3f8 100644
--- a/DiscImageChef.Filesystems/ISO9660/Structs.cs
+++ b/DiscImageChef.Filesystems/ISO9660/Structs.cs
@@ -632,6 +632,26 @@ namespace DiscImageChef.Filesystems.ISO9660
             public uint uncomp_len_be;
         }
 
+        [StructLayout(LayoutKind.Sequential, Pack = 1)]
+        struct AmigaEntry
+        {
+            public ushort signature;
+            public byte length;
+            public byte version;
+            public AmigaFlags flags;
+            // Followed by AmigaProtection if present
+            // Followed by length-prefixed string for comment if present
+        }
+
+        [StructLayout(LayoutKind.Sequential, Pack = 1)]
+        struct AmigaProtection
+        {
+            public byte User;
+            public byte Reserved;
+            public AmigaMultiuser Multiuser;
+            public AmigaAttributes Protection;
+        }
+
         struct DecodedVolumeDescriptor
         {
             public string SystemIdentifier;