From 5ddf0d6705b51118abd98067fc042347baeac007 Mon Sep 17 00:00:00 2001
From: Lukas Cone <lukas.kuzel.ch@gmail.com>
Date: Sat, 19 Feb 2022 17:57:01 +0100
Subject: [PATCH] patterns: Added ISO pattern (#30)

---
 README.md           |   1 +
 patterns/iso.hexpat | 132 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+)
 create mode 100644 patterns/iso.hexpat

diff --git a/README.md b/README.md
index 4fa2cd6..22c3f79 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ Hex patterns, include patterns and magic files for the use with the ImHex Hex Ed
 | PNG  | `image/png` | `patterns/png.hexpat` | PNG image files | 
 | DDS | `image/vnd-ms.dds` | `patterns/dds.hexpat` | DirectDraw Surface |
 | TGA | `image/tga` | `patterns/tga.hexpat` | Truevision TGA/TARGA image |
+| ISO | | `patterns/iso.hexpat` | ISO 9660 file system |
 
 ### Scripts
 
diff --git a/patterns/iso.hexpat b/patterns/iso.hexpat
new file mode 100644
index 0000000..c38bcb5
--- /dev/null
+++ b/patterns/iso.hexpat
@@ -0,0 +1,132 @@
+#pragma endian little
+
+#include <std/io.pat>
+
+enum VolumeDescriptorTypes : u8 {
+  BootRecord,
+  PrimaryVolume,
+  SupplementaryVolume,
+  VolumePartition,
+  Terminator = 0xff,
+};
+
+struct di32 {
+  s32    leValue;
+  be s32 beValue;
+} [[static]];
+
+struct di16 {
+  s16    leValue;
+  be s16 beValue;
+} [[static]];
+
+struct PathTablePtr {
+  s32    leMainOffset;
+  s32    leOptOffset;
+  be s32 beMainOffset;
+  be s32 beOptOffset;
+} [[static]];
+
+struct DateFormat {
+  u8 year;
+  u8 month;
+  u8 day;
+  u8 hour;
+  u8 minute;
+  u8 second;
+  u8 gmtOffset;
+} [[static]];
+
+fn FormatDate(DateFormat fmt) {
+  s16 gmt = (-48 + fmt.gmtOffset) * 15;
+  float gmtHour = gmt / 60;
+  s16 gmtMinute = gmt % 60;
+  str retVal = std::format("{}.{:02}.{:02} {:02}:{:02}:{:02} GMT{:+03}:{:02}",
+                           fmt.day, fmt.month, fmt.year + 1900,
+                           fmt.hour, fmt.minute, fmt.second,
+                           gmtHour, gmtMinute);
+  return retVal;
+};
+
+struct StrDateFormat {
+  char year[4];
+  char month[2];
+  char day[2];
+  char hour[2];
+  char minute[2];
+  char second[2];
+  char secondFrac[2];
+  u8   gmtOffset;
+} [[static]];
+
+fn FormatStrDate(StrDateFormat fmt) {
+  s16 gmt = (-48 + fmt.gmtOffset) * 15;
+  float gmtHour = gmt / 60;
+  s16 gmtMinute = gmt % 60;
+  str retVal = std::format("{}.{}.{} {}:{}:{}.{} GMT{:+03}:{:02}",
+                           fmt.day, fmt.month, fmt.year,
+                           fmt.hour, fmt.minute, fmt.second, fmt.secondFrac,
+                           gmtHour, gmtMinute);
+  return retVal;
+};
+
+bitfield FileFlags {
+  hidden                           : 1;
+  directory                        : 1;
+  associatedFile                   : 1;
+  extendedAttribute                : 1;
+  ownerAndGroupInExtendedAttribute : 1;
+  padding                          : 2;
+  fileRecordNotFinal               : 1;
+};
+
+struct DirectoryRecord {
+  u8 recordSize;
+  u8 extendedRecordSize;
+  di32 extentOffset;
+  di32 dataSize;
+  DateFormat recordDate[[format("FormatDate")]];
+  FileFlags fileFlags;
+  u8 fileUnitSize;
+  u8 interleaveGapSize;
+  di16 volumeSequenceNumber;
+  u8 fileNameLen;
+  char fileName[fileNameLen];
+  padding[$ % 2];
+};
+
+struct VolumeDescriptor {
+  VolumeDescriptorTypes type;
+  char id[5];
+  u8 version;
+
+  if (type == VolumeDescriptorTypes::PrimaryVolume) {
+    padding[1];
+    char systemId[0x20];
+    char volumeId[0x20];
+    padding[8];
+    di32 spaceSize;
+    padding[0x20];
+    di16 setSize;
+    di16 sequenceNumber;
+    di16 logicalBlockSize;
+    di32 pathTableSize;
+    PathTablePtr pathTableOffset;
+    DirectoryRecord rootDir;
+    char setId[0x80];
+    char publisherId[0x80];
+    char preparerId[0x80];
+    char applicationId[0x80];
+    char copyrightFileId[0x25];
+    char abstractFileId[0x25];
+    char bibliographicFileId[0x25];
+    StrDateFormat creationTime[[format("FormatStrDate")]];
+    StrDateFormat modificationTime[[format("FormatStrDate")]];
+    StrDateFormat expirationTime[[format("FormatStrDate")]];
+    StrDateFormat effectiveTime[[format("FormatStrDate")]];
+    u8 fileStructVersion;
+    padding[0x200 + 0x28E];
+  }
+};
+
+VolumeDescriptor data @ 0x8000;
\ No newline at end of file