patterns: Adding IPS pattern and fixed PE magic file (#153)

* Update pe.hexpat

New improvement

* Add ips.hexpat via upload

* Add ips.hexpat.ips via upload

* Added IPS to README

* Mentioned Windows in portable_executable_magic

README.md

@@ -57,6 +57,7 @@ Everything will immediately show up in ImHex's Content Store and gets bundled wi
 | ID3 | `audio/mpeg` | [`patterns/id3.hexpat`](patterns/id3.hexpat) | ID3 tags in MP3 files |
 | Intel HEX  | | [`patterns/intel_hex.hexpat`](patterns/intel_hex.hexpat) | [Intel hexadecimal object file format definition]("https://en.wikipedia.org/wiki/Intel_HEX") |
 | IP | | [`patterns/ip.hexpat`](patterns/ip.hexpat) | Ethernet II Frames (IP Packets) |
+| IPS | | [`patterns/ips.hexpat`](patterns/ips.hexpat) | IPS (International Patching System) files |
 | ISO | | [`patterns/iso.hexpat`](patterns/iso.hexpat) | ISO 9660 file system |
 | Java Class | `application/x-java-applet` | [`patterns/java_class.hexpat`](patterns/java_class.hexpat) | Java Class files |
 | JPEG | `image/jpeg` | [`patterns/jpeg.hexpat`](patterns/jpeg.hexpat) | JPEG Image Format |

magic/portable_executable_magic

@@ -1,4 +1,4 @@
-# A libmagic database containing definition for PE files used by MS-DOS based systems
+# A libmagic database containing definition for PE files used by MS-DOS/Windows based systems
 
 # MS-DOS Portable Executable
 0x0		    string/b	MZ      MS-DOS Binary

patterns/ips.hexpat

@@ -0,0 +1,30 @@
+#include <std/mem.pat>
+#include <std/string.pat>
+
+#pragma endian big
+
+u8 eofOffset = 3;
+
+struct Hunk {
+	u24 offset;
+	u16 length;
+	if (length == 0) {
+		u16 runCount;
+		u8 payload;
+	}
+	else {
+		u8 payload[length];
+	}
+};
+
+struct IPS {
+	char signature[5];
+	if (std::mem::read_string(std::mem::size()-3, 3) != "EOF") {
+		eofOffset += 3;
+	}
+	Hunk hunks[while($ < std::mem::size()-eofOffset)];
+	char eof[3];
+	u24 truncatedSize[eofOffset>3];
+};
+
+IPS ips @ 0x00;