--- /dev/null
+/*\r
+ * Acess2\r
+ * FAT12/16/32 Driver\r
+ * vfs/fs/fs_fat.h\r
+ */\r
+#ifndef _FS_FAT_H_\r
+#define _FS_FAT_H_\r
+\r
+// === On Disk Structures ===\r
+/**\r
+ * \struct fat_bootsect_s\r
+ * \brief Bootsector format\r
+ */\r
+struct fat_bootsect_s\r
+{\r
+ Uint8 jmp[3]; //!< Jump Instruction\r
+ char oemname[8]; //!< OEM Name. Typically MSDOS1.1\r
+ Uint16 bps; //!< Bytes per Sector. Assumed to be 512\r
+ Uint8 spc; //!< Sectors per Cluster\r
+ Uint16 resvSectCount; //!< Number of reserved sectors at beginning of volume\r
+ // +0x10\r
+ Uint8 fatCount; //!< Number of copies of the FAT\r
+ Uint16 files_in_root; //!< Count of files in the root directory\r
+ Uint16 totalSect16; //!< Total sector count (FAT12/16)\r
+ Uint8 mediaDesc; //!< Media Desctiptor\r
+ Uint16 fatSz16; //!< FAT Size (FAT12/16)\r
+ // +0x18\r
+ Uint16 spt; //!< Sectors per track. Ignored (Acess uses LBA)\r
+ Uint16 heads; //!< Heads. Ignored (Acess uses LBA)\r
+ Uint32 hiddenCount; //!< ???\r
+ Uint32 totalSect32; //!< Total sector count (FAT32)\r
+ union {\r
+ struct {\r
+ Uint8 drvNum; //!< Drive Number. BIOS Drive ID (E.g. 0x80)\r
+ Uint8 resv; //!< Reserved byte\r
+ Uint8 bootSig; //!< Boot Signature. ???\r
+ Uint32 volId; //!< Volume ID\r
+ char label[11]; //!< Disk Label\r
+ char fsType[8]; //!< FS Type. ???\r
+ } __attribute__((packed)) fat16; //!< FAT16 Specific information\r
+ struct {\r
+ Uint32 fatSz32; //!< 32-Bit FAT Size\r
+ Uint16 extFlags; //!< Extended flags\r
+ Uint16 fsVer; //!< Filesystem Version\r
+ Uint32 rootClust; //!< Root Cluster ID\r
+ Uint16 fsInfo; //!< FS Info. ???\r
+ Uint16 backupBS; //!< Backup Bootsector Sector Offset\r
+ char resv[12]; //!< Reserved Data\r
+ Uint8 drvNum; //!< Drive Number\r
+ char resv2; //!< Reserved Data\r
+ Uint8 bootSig; //!< Boot Signature. ???\r
+ Uint32 volId; //!< Volume ID\r
+ char label[11]; //!< Disk Label\r
+ char fsType[8]; //!< Filesystem Type. ???\r
+ } __attribute__((packed)) fat32; //!< FAT32 Specific Information\r
+ }__attribute__((packed)) spec; //!< Non Shared Data\r
+ char pad[512-90]; //!< Bootsector Data (Code/Boot Signature 0xAA55)\r
+} __attribute__((packed));\r
+\r
+/**\r
+ \struct fat_filetable_s\r
+ \brief Format of a 8.3 file entry on disk\r
+*/\r
+struct fat_filetable_s {\r
+ char name[11]; //!< 8.3 Name\r
+ Uint8 attrib; //!< File Attributes.\r
+ Uint8 ntres; //!< Reserved for NT - Set to 0\r
+ Uint8 ctimems; //!< 10ths of a second ranging from 0-199 (2 seconds)\r
+ Uint16 ctime; //!< Creation Time\r
+ Uint16 cdate; //!< Creation Date\r
+ Uint16 adate; //!< Accessed Date. No Time feild though\r
+ Uint16 clusterHi; //!< High Cluster. 0 for FAT12 and FAT16\r
+ Uint16 mtime; //!< Last Modified Time\r
+ Uint16 mdate; //!< Last Modified Date\r
+ Uint16 cluster; //!< Low Word of First cluster\r
+ Uint32 size; //!< Size of file\r
+} __attribute__((packed));\r
+\r
+/**\r
+ * \struct fat_longfilename_s\r
+ * \brief Format of a long file name entry on disk\r
+ */\r
+struct fat_longfilename_s {\r
+ Uint8 id; //!< ID of entry. Bit 6 is set for last entry\r
+ Uint16 name1[5]; //!< 5 characters of name\r
+ Uint8 attrib; //!< Attributes. Must be ATTR_LFN\r
+ Uint8 type; //!< Type. ???\r
+ Uint8 checksum; //!< Checksum\r
+ Uint16 name2[6]; //!< 6 characters of name\r
+ Uint16 firstCluster; //!< Used for non LFN compatability. Set to 0\r
+ Uint16 name3[2]; //!< Last 2 characters of name\r
+} __attribute__((packed));\r
+\r
+/**\r
+ * \name File Attributes\r
+ * \brief Flag values for ::fat_filetable_s.attrib\r
+ * \{\r
+ */\r
+#define ATTR_READONLY 0x01 //!< Read-only file\r
+#define ATTR_HIDDEN 0x02 //!< Hidden File\r
+#define ATTR_SYSTEM 0x04 //!< System File\r
+#define ATTR_VOLUMEID 0x08 //!< Volume ID (Deprecated)\r
+#define ATTR_DIRECTORY 0x10 //!< Directory\r
+/**\r
+ * \brief File needs archiving\r
+ * \note User set flag, no significance to the FS driver\r
+ */\r
+#define ATTR_ARCHIVE 0x20\r
+/**\r
+ * \brief Meta Attribute \r
+ * \r
+ * If ::fat_filetable_s.attrib equals ATTR_LFN the file is a LFN entry\r
+ */\r
+#define ATTR_LFN (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUMEID)\r
+/**\r
+ * \}\r
+ */\r
+\r
+/**\r
+ * \brief Internal IDs for FAT types\r
+ */\r
+enum eFatType\r
+{\r
+ FAT12, //!< FAT12 Volume\r
+ FAT16, //!< FAT16 Volume\r
+ FAT32, //!< FAT32 Volume\r
+};\r
+\r
+/**\r
+ * \name End of Cluster marks\r
+ * \brief FAT values that indicate the end of a cluster chain in\r
+ * different versions.\r
+ * \{\r
+ */\r
+#define EOC_FAT12 0x0FFF //!< FAT-12 Mark\r
+#define EOC_FAT16 0xFFFF //!< FAT-16 Mark\r
+#define EOC_FAT32 0x00FFFFFF //!< FAT-32 Mark\r
+/**\r
+ * \}\r
+ */\r
+\r
+typedef struct fat_bootsect_s fat_bootsect;\r
+typedef struct fat_filetable_s fat_filetable;\r
+typedef struct fat_longfilename_s fat_longfilename;\r
+\r
+// === Memory Structures ===\r
+/**\r
+ * \struct drv_fat_volinfo_s\r
+ * \brief Representation of a volume in memory\r
+ */\r
+struct drv_fat_volinfo_s\r
+{\r
+ int fileHandle; //!< File Handle\r
+ int type; //!< FAT Type. See eFatType\r
+ char name[12]; //!< Volume Name (With NULL Terminator)\r
+ tMutex lFAT; //!< Lock to prevent double-writing to the FAT\r
+ Uint32 firstDataSect; //!< First data sector\r
+ Uint32 rootOffset; //!< Root Offset (clusters)\r
+ Uint32 ClusterCount; //!< Total Cluster Count\r
+ fat_bootsect bootsect; //!< Boot Sector\r
+ tVFS_Node rootNode; //!< Root Node\r
+ int BytesPerCluster;\r
+ int inodeHandle; //!< Inode Cache Handle\r
+ #if CACHE_FAT\r
+ Uint32 *FATCache; //!< FAT Cache\r
+ #endif\r
+};\r
+\r
+typedef struct drv_fat_volinfo_s tFAT_VolInfo;\r
+\r
+#endif\r
git.ucc.asn.au / tpg / acess2.git / blobdiff
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