Changeset 66594 in vbox for trunk/include/iprt/formats

Timestamp:

Apr 17, 2017 3:29:05 PM (8 years ago)

Author:

vboxsync

Message:

iprt: Reworked and implemented VFS chains, adding stdfile, gzip and gunzip element provider/factories.

File:

• trunk/include/iprt/formats/fat.h (modified) (24 diffs)

trunk/include/iprt/formats/fat.h

@@ -31 +31 @@
 #include <iprt/assert.h>
 
-#pragma pack(1)
 
 /** @name FAT Media byte values
@@ -47 +46 @@
  * This was the first DOS version with a BPB.
  */
+#pragma pack(1)
 typedef struct FATBPB20
 {
@@ -66 +66 @@
     uint16_t        cSectorsPerFat;
 } FATBPB20;
+#pragma pack()
 AssertCompileSize(FATBPB20, 0xd);
 /** Pointer to a DOS 2.0 BPB. */
@@ -76 +77 @@
  * The DOS 3.0 BPB changes that survived.
  */
+#pragma pack(1)
 typedef struct FATBPB30CMN
 {
@@ -85 +87 @@
     uint16_t        cTracksPerCylinder;
 } FATBPB30CMN;
+#pragma pack()
 AssertCompileSize(FATBPB30CMN, 0x11);
 
@@ -90 +93 @@
  * The DOS 3.0 BPB.
  */
+#pragma pack(1)
 typedef struct FATBPB30
 {
@@ -98 +102 @@
     uint16_t        cHiddenSectors;
 } FATBPB30;
+#pragma pack()
 AssertCompileSize(FATBPB30, 0x13);
 /** Pointer to a DOS 3.0 BPB. */
@@ -107 +112 @@
  * The DOS 3.0 BPB, flattened structure.
  */
+#pragma pack(1)
 typedef struct FATBPB30FLAT
 {
@@ -139 +145 @@
     /** @} */
 } FATBPB30FLAT;
+#pragma pack()
 AssertCompileSize(FATBPB30FLAT, 0x13);
 /** Pointer to a flattened DOS 3.0 BPB. */
@@ -149 +156 @@
  * The DOS 3.2 BPB.
  */
+#pragma pack(1)
 typedef struct FATBPB32
 {
@@ -157 +165 @@
     uint16_t        cAnotherTotalSectors;
 } FATBPB32;
+#pragma pack()
 AssertCompileSize(FATBPB32, 0x15);
 /** Pointer to a DOS 3.2 BPB. */
@@ -166 +175 @@
  * The DOS 3.2 BPB, flattened structure.
  */
+#pragma pack(1)
 typedef struct FATBPB32FLAT
 {
@@ -204 +214 @@
     /** @} */
 } FATBPB32FLAT;
+#pragma pack()
 AssertCompileSize(FATBPB32FLAT, 0x15);
 /** Pointer to a flattened DOS 3.2 BPB. */
@@ -214 +225 @@
  * The DOS 3.31 BPB.
  */
+#pragma pack(1)
 typedef struct FATBPB331
 {
@@ -226 +238 @@
     uint32_t        cTotalSectors32;
 } FATBPB331;
+#pragma pack()
 AssertCompileSize(FATBPB331, 0x19);
 /** Pointer to a DOS 3.31 BPB. */
@@ -235 +248 @@
  * The DOS 3.31 BPB, flattened structure.
  */
+#pragma pack(1)
 typedef struct FATBPB331FLAT
 {
@@ -274 +288 @@
     /** @} */
 } FATBPB331FLAT;
+#pragma pack()
 AssertCompileSize(FATBPB331FLAT, 0x19);
 /** Pointer to a flattened DOS 3.31 BPB. */
@@ -284 +299 @@
  * Extended BIOS parameter block (EBPB).
  */
+#pragma pack(1)
 typedef struct FATEBPB
 {
@@ -306 +322 @@
     char            achType[8];
 } FATEBPB;
+#pragma pack()
 AssertCompileSize(FATEBPB, 0x33);
 /** Pointer to an extended BIOS parameter block. */
@@ -329 +346 @@
  * FAT32 Extended BIOS parameter block (EBPB).
  */
+#pragma pack(1)
 typedef struct FAT32EBPB
 {
@@ -376 +394 @@
     union
     {
+        /** Type string variant.  */
         char        achType[8];
+        /** Total sector count if 4G or higher. */
         uint64_t    cTotalSectors64;
     } u;
 } FAT32EBPB;
+#pragma pack()
 AssertCompileSize(FAT32EBPB, 0x4f);
 /** Pointer to a FAT32 extended BIOS parameter block. */
@@ -393 +414 @@
  * FAT boot sector layout.
  */
+#pragma pack(1)
 typedef struct FATBOOTSECTOR
 {
@@ -417 +439 @@
     uint16_t            uSignature;
 } FATBOOTSECTOR;
+#pragma pack()
 AssertCompileSize(FATBOOTSECTOR, 0x200);
 /** Pointer to a FAT boot sector. */
@@ -426 +449 @@
 #define FATBOOTSECTOR_SIGNATURE     UINT16_C(0xaa55)
 
-#pragma pack()
+
+
+/**
+ * FAT32 info sector (follows the boot sector).
+ */
+typedef struct FAT32INFOSECTOR
+{
+    /** 0x000: Signature \#1 (FAT32INFOSECTOR_SIGNATURE_1). */
+    uint32_t        uSignature1;
+    /** Reserved, should be zero. */
+    uint8_t         abReserved1[0x1E0];
+    /** 0x1e4: Signature \#1 (FAT32INFOSECTOR_SIGNATURE_2). */
+    uint32_t        uSignature2;
+    /** 0x1e8: Last known number of free clusters (informational). */
+    uint32_t        cFreeClusters;
+    /** 0x1ec: Last allocated cluster number (informational).  This could be used as
+     * an allocation hint when searching for a free cluster. */
+    uint32_t        cLastAllocatedCluster;
+    /** 0x1f0: Reserved, should be zero, preserve. */
+    uint8_t         abReserved2[12];
+    /** 0x1fc: Signature \#3 (FAT32INFOSECTOR_SIGNATURE_3). */
+    uint32_t        uSignature3;
+} FAT32INFOSECTOR;
+AssertCompileSize(FAT32INFOSECTOR, 0x200);
+/** Pointer to a FAT32 info sector. */
+typedef FAT32INFOSECTOR *PFAT32INFOSECTOR;
+/** Pointer to a const FAT32 info sector. */
+typedef FAT32INFOSECTOR const *PCFAT32INFOSECTOR;
+
+#define FAT32INFOSECTOR_SIGNATURE_1     UINT32_C(0x41615252)
+#define FAT32INFOSECTOR_SIGNATURE_2     UINT32_C(0x61417272)
+#define FAT32INFOSECTOR_SIGNATURE_3     UINT32_C(0xaa550000)
 
 #endif