patterns: Add CAB pattern (#342)

* Add files via upload

* Add files via upload

* Update README.md

patterns/cab.hexpat

@@ -0,0 +1,110 @@
+#pragma author The Wandering Trader
+#pragma description Microsoft Cabinet (CAB) Files
+#pragma magic [4D 53 43 46] @ 0x00
+
+import type.time;
+import type.magic;
+import type.size;
+
+fn format_string(auto string) {
+    return std::format("{}",string);
+};
+
+bitfield flags {
+    bool cfhdrPREV_CABINET : 1;
+    bool cfhdrNEXT_CABINET : 1;
+    bool cfhdrRESERVE_PRESENT : 1;
+    padding : 13;
+};
+
+struct CFHEADER {
+    type::Magic<"MSCF"> signature;
+    u32 reserved1;
+    type::Size32 cbCabinet;
+    u32 reserved2;
+    u32 coffFiles;
+    u32 reserved3;
+    u8 versionMajor;
+    u8 versionMinor;
+    u16 cFolders;
+    u16 cFiles;
+    flags flags;
+    u16 setID;
+    u16 iCabinet;
+    if (flags.cfhdrRESERVE_PRESENT) {
+        type::Size16 cbCFHeader;
+        type::Size8 cbCFFolder;
+        type::Size8  cbCFData;
+        u8 abReserve[cbCFHeader];
+    }
+    if (flags.cfhdrPREV_CABINET) {
+        char szCabinetPrev[] [[format("format_string")]];
+        char szDiskPrev[] [[format("format_string")]];
+    }
+    if (flags.cfhdrNEXT_CABINET) {
+        char szCabinetNext[] [[format("format_string")]];
+        char szDiskNext[] [[format("format_string")]];
+    }
+};
+
+enum typeCompress : u8{
+    tcompMASK_TYPE = 0x000F,
+    tcompTYPE_NONE = 0x0000,
+    tcompTYPE_MSZIP = 0x0001,
+    tcompTYPE_QUANTUM = 0x0002,
+    tcompTYPE_LZX = 0x0003,
+};
+
+using CFDATA;
+
+struct CFFOLDER {
+    u32 coffCabStart;
+    u16 cCfData;
+    typeCompress typeCompress;
+    u8 compressionLevel;
+    if (CFHEADER.flags.cfhdrRESERVE_PRESENT) {
+        u8 abReserve[CFHEADER.cbCFFolder];
+    }
+    CFDATA CFDATA[cCfData] @ coffCabStart;
+};
+
+bitfield attribs {
+    bool _A_RDONLY : 1;
+    bool _A_HIDDEN : 1;
+    bool _A_SYSTEM : 1;
+    padding : 2;
+    bool _A_ARCH : 1;
+    bool _A_EXEC : 1;
+    bool _A_NAME_IS_UTF : 1;
+    padding : 8;
+};
+
+struct CFFILE {
+    type::Size32 cbFile;
+    u32 uoffFolderStart;
+    u16 iFolder;
+    type::DOSDate date;
+    type::DOSTime time;
+    attribs attribs;
+    if (attribs._A_NAME_IS_UTF) {
+        char16 szName[];
+    } else {
+        char szName[] [[format("format_string")]];
+    }
+    
+    
+};
+
+struct CFDATA {
+    u32 csum;
+    type::Size16 cbData;
+    type::Size16 cbUncomp;
+    if (CFHEADER.flags.cfhdrRESERVE_PRESENT) {
+        u8 abReserve[CFHEADER.cbCFData];
+    }
+    u8 ab[cbData];
+};
+
+CFHEADER CFHEADER @ 0;
+CFFOLDER CFFOLDER[CFHEADER.cFolders] @ $;
+CFFILE CFFILE[CFHEADER.cFiles] @ $;