1 files changed, 544 insertions, 0 deletions
diff --git a/nuttx/fs/fat/fs_writefat.c b/nuttx/fs/fat/fs_writefat.c
new file mode 100644
index 000000000..02d55d625
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+++ b/nuttx/fs/fat/fs_writefat.c
@@ -0,0 +1,544 @@
+/****************************************************************************
+ * fs/fat/fs_writefat.c
+ *
+ *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+#include <nuttx/fs/fat.h>
+#include <nuttx/fs/mkfatfs.h>
+
+#include "fs_internal.h"
+#include "fs_fat32.h"
+#include "fs_mkfatfs.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mkfatfs_initmbr
+ *
+ * Description:
+ *   Initialize the sector image of a masterbood record
+ *
+ * Input:
+ *    fmt  - User specified format parameters
+ *    var  - Other format parameters that are not user specifiable
+ *
+ * Return:
+ *    None; caller is responsible for providing valid parameters.
+ *
+ ****************************************************************************/
+static inline void mkfatfs_initmbr(FAR struct fat_format_s *fmt,
+                                   FAR struct fat_var_s *var)
+{
+  memset(var->fv_sect, 0, var->fv_sectorsize);
+
+  /* 3@0: Jump instruction to boot code */
+
+  memcpy(&var->fv_sect[BS_JUMP], var->fv_jump, 3);
+
+  /* 8@3: Usually "MSWIN4.1" */
+
+  strcpy((char*)&var->fv_sect[BS_OEMNAME], "NUTTX   ");
+
+  /* 2@11: Bytes per sector: 512, 1024, 2048, 4096  */
+
+  MBR_PUTBYTESPERSEC(var->fv_sect, var->fv_sectorsize);
+
+  /* 1@13: Sectors per allocation unit: 2**n, n=0..7 */
+
+  MBR_PUTSECPERCLUS(var->fv_sect, (1 << fmt->ff_clustshift));
+
+  /* 2@14: Reserved sector count: Usually 32 */
+
+  MBR_PUTRESVDSECCOUNT(var->fv_sect, fmt->ff_rsvdseccount);
+
+  /* 1@16: Number of FAT data structures: always 2 */
+
+  MBR_PUTNUMFATS(var->fv_sect, fmt->ff_nfats);
+
+  /* 2@17: FAT12/16: Must be 0 for FAT32 */
+
+  MBR_PUTROOTENTCNT(var->fv_sect, fmt->ff_rootdirentries);
+
+  /* 2@19: FAT12/16: Must be 0, see BS_TOTSEC32.
+   * Handled with 4@32: Total count of sectors on the volume */
+
+  if (fmt->ff_nsectors >= 65536)
+    {
+      MBR_PUTTOTSEC32(var->fv_sect, fmt->ff_nsectors);
+    }
+  else
+    {
+      MBR_PUTTOTSEC16(var->fv_sect, (uint16_t)fmt->ff_nsectors);
+    }
+
+  /* 1@21: Media code: f0, f8, f9-fa, fc-ff */ 
+
+  MBR_PUTMEDIA(var->fv_sect, FAT_DEFAULT_MEDIA_TYPE); /* Only "hard drive" supported */
+  
+  /* 2@22: FAT12/16: Must be 0, see BS32_FATSZ32  -- handled in FAT specific logic */
+ 
+  /* 2@24: Sectors per track geometry value and 2@26: Number of heads geometry value */
+
+  MBR_PUTSECPERTRK(var->fv_sect, FAT_DEFAULT_SECPERTRK);
+  MBR_PUTNUMHEADS(var->fv_sect, FAT_DEFAULT_NUMHEADS);
+
+  /* 4@28: Count of hidden sectors preceding FAT */
+
+  MBR_PUTHIDSEC(var->fv_sect, fmt->ff_hidsec);
+
+  /* 4@32: Total count of sectors on the volume -- handled above */
+
+  /* Most of the rest of the sector depends on the FAT size */
+
+  if (fmt->ff_fattype != 32)
+    {
+      /* 2@22: FAT12/16: Must be 0, see BS32_FATSZ32 */
+
+      MBR_PUTFATSZ16(var->fv_sect, (uint16_t)var->fv_nfatsects);
+
+      /* The following fields are only valid for FAT12/16 */
+      /*  1@36: Drive number for MSDOS bootstrap -- left zero */
+      /*  1@37: Reserved (zero) */
+      /*  1@38: Extended boot signature: 0x29 if following valid */
+
+      MBR_PUTBOOTSIG16(var->fv_sect, EXTBOOT_SIGNATURE);
+
+      /* 4@39: Volume serial number */
+
+      MBR_PUTVOLID16(var->fv_sect, fmt->ff_volumeid);
+
+      /* 11@43: Volume label */
+
+      memcpy(&var->fv_sect[BS16_VOLLAB], fmt->ff_volumelabel, 11);
+
+      /* 8@54: "FAT12  ", "FAT16  ", or "FAT    " */
+
+      if (fmt->ff_fattype == 12)
+        {
+          memcpy(&var->fv_sect[BS16_FILESYSTYPE], "FAT12   ", 8);
+        }
+      else /* if (fmt->ff_fattype == 16) */
+        {
+          memcpy(&var->fv_sect[BS16_FILESYSTYPE], "FAT16   ", 8);
+        }
+
+      /* Boot code may be placed in the remainder of the sector */
+
+      memcpy(&var->fv_sect[BS16_BOOTCODE], var->fv_bootcode, var->fv_bootcodesize);
+    }
+  else
+    {
+      /* The following fields are only valid for FAT32 */
+      /*  4@36: Count of sectors occupied by one FAT */
+
+      MBR_PUTFATSZ32(var->fv_sect, var->fv_nfatsects);
+
+      /* 2@40: 0-3:Active FAT, 7=0 both FATS, 7=1 one FAT -- left zero*/ 
+      /* 2@42: MSB:Major LSB:Minor revision number (0.0) -- left zero */
+      /* 4@44: Cluster no. of 1st cluster of root dir */
+
+      MBR_PUTROOTCLUS(var->fv_sect, FAT32_DEFAULT_ROOT_CLUSTER);
+
+      /* 2@48: Sector number of fsinfo structure. Usually 1. */
+
+      MBR_PUTFSINFO(var->fv_sect, FAT_DEFAULT_FSINFO_SECTOR);
+
+      /* 2@50: Sector number of boot record. Usually 6  */
+
+      MBR_PUTBKBOOTSEC(var->fv_sect, fmt->ff_backupboot);
+
+      /* 12@52: Reserved (zero) */
+      /*  1@64: Drive number for MSDOS bootstrap -- left zero */
+      /*  1@65: Reserved (zero) */
+      /*  1@66: Extended boot signature: 0x29 if following valid */
+ 
+      MBR_PUTBOOTSIG32(var->fv_sect, EXTBOOT_SIGNATURE);
+
+      /* 4@67: Volume serial number */
+
+      MBR_PUTVOLID32(var->fv_sect, fmt->ff_volumeid);
+
+      /* 11@71: Volume label */
+
+      memcpy(&var->fv_sect[BS32_VOLLAB], fmt->ff_volumelabel, 11);
+
+      /* 8@82: "FAT12  ", "FAT16  ", or "FAT    " */
+
+      memcpy(&var->fv_sect[BS32_FILESYSTYPE], "FAT32   ", 8);
+
+      /* Boot code may be placed in the remainder of the sector */
+
+      memcpy(&var->fv_sect[BS16_BOOTCODE], var->fv_bootcode, var->fv_bootcodesize);
+    }
+
+  /* The magic bytes at the end of the MBR are common to FAT12/16/32 */
+  /*  2@510: Valid MBRs have 0x55aa here */
+
+  MBR_PUTSIGNATURE(var->fv_sect, BOOT_SIGNATURE16);
+}
+
+/****************************************************************************
+ * Name: mkfatfs_initfsinfo
+ *
+ * Description:
+ *   Initialize the FAT32 FSINFO sector image
+ *
+ * Input:
+ *    fmt  - User specified format parameters
+ *    var  - Other format parameters that are not user specifiable
+ *
+ * Return:
+ *    None; caller is responsible for providing valid parameters.
+ *
+ ****************************************************************************/
+static inline void mkfatfs_initfsinfo(FAR struct fat_format_s *fmt,
+                                      FAR struct fat_var_s *var)
+{
+  memset(var->fv_sect, 0, var->fv_sectorsize);
+
+  /* 4@0: 0x41615252 = "RRaA" */
+
+  FSI_PUTLEADSIG(var->fv_sect, 0x41615252);
+
+  /* 480@4: Reserved (zero) */
+  /* 4@484: 0x61417272 = "rrAa" */
+
+  FSI_PUTSTRUCTSIG(var->fv_sect, 0x61417272);
+
+  /* 4@488: Last free cluster count on volume */
+
+  FSI_PUTFREECOUNT(var->fv_sect, var->fv_nclusters - 1);
+
+  /* 4@492: Cluster number of 1st free cluster */
+
+  FSI_PUTNXTFREE(var->fv_sect, FAT32_DEFAULT_ROOT_CLUSTER);
+
+  /* 12@496: Reserved (zero) */
+  /* 4@508:  0xaa550000 */
+
+  FSI_PUTTRAILSIG(var->fv_sect, BOOT_SIGNATURE32);
+}
+
+/****************************************************************************
+ * Name: mkfatfs_initrootdir
+ *
+ * Description:
+ *   Initialize one root directory sector image
+ *
+ * Input:
+ *    fmt  - User specified format parameters
+ *    var  - Other format parameters that are not user specifiable
+ *    sectno - On FAT32, the root directory is a cluster chain.
+ *        This value indicates which sector of the cluster should be produced.
+ *
+ * Return:
+ *    None; caller is responsible for providing valid parameters.
+ *
+ ****************************************************************************/
+static inline void mkfatfs_initrootdir(FAR struct fat_format_s *fmt,
+                                       FAR struct fat_var_s *var, int sectno)
+{
+  memset(var->fv_sect, 0, var->fv_sectorsize);
+  if (sectno == 0)
+    {
+      /* It is only necessary to set data in the first sector of the directory */
+      
+      if (memcmp(fmt->ff_volumelabel, "           ", 11))
+        {
+          memcpy(&var->fv_sect[DIR_NAME], fmt->ff_volumelabel, 11);
+        }
+
+      DIR_PUTATTRIBUTES(var->fv_sect, FATATTR_VOLUMEID);
+      DIR_PUTCRTIME(var->fv_sect, var->fv_createtime & 0xffff);
+      DIR_PUTWRTTIME(var->fv_sect, var->fv_createtime & 0xffff);
+      DIR_PUTCRDATE(var->fv_sect, var->fv_createtime >> 16);
+      DIR_PUTWRTDATE(var->fv_sect, var->fv_createtime >> 16);
+    }
+}
+
+/****************************************************************************
+ * Name: mkfatfs_writembr
+ *
+ * Description:
+ *   Write the master boot record and, for FAT32, the backup boot record and
+ *   the fsinfo sector.
+ *
+ * Input:
+ *    fmt  - User specified format parameters
+ *    var  - Other format parameters that are not user specifiable
+ *
+ * Return:
+ *    Zero on success; negated errno on failure
+ *
+ ****************************************************************************/
+
+static inline int mkfatfs_writembr(FAR struct fat_format_s *fmt,
+                                   FAR struct fat_var_s *var)
+{
+  int sectno;
+  int ret;
+
+  /* Create an image of the configured master boot record */
+
+  mkfatfs_initmbr(fmt, var);
+
+  /* Write the master boot record as sector zero */
+
+  ret = DEV_WRITE(var->fv_sect, 0, 1);
+
+  /* Write all of the reserved sectors */
+
+  memset(var->fv_sect, 0, var->fv_sectorsize);
+ for (sectno = 1; sectno < fmt->ff_rsvdseccount && ret >= 0; sectno++)
+    {
+      ret = DEV_WRITE(var->fv_sect, sectno, 1);
+    }
+ 
+  /* Write FAT32-specific sectors */
+
+  if (ret >= 0 && fmt->ff_fattype == 32)
+    {
+      /* Write the backup master boot record */
+
+      if (fmt->ff_backupboot != 0)
+        {
+          /* Create another copy of the configured master boot record */
+
+          mkfatfs_initmbr(fmt, var);
+
+          /* Write it to the backup location */
+
+          ret = DEV_WRITE(var->fv_sect, fmt->ff_backupboot, 1);
+        }
+
+      if (ret >= 0)
+        {
+          /* Create an image of the fsinfo sector*/
+
+          mkfatfs_initfsinfo(fmt, var);
+
+          /* Write the fsinfo sector */
+
+          ret = DEV_WRITE(var->fv_sect, FAT_DEFAULT_FSINFO_SECTOR, 1);
+        }
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: mkfatfs_writefat
+ *
+ * Description:
+ *   Write the FAT sectors
+ *
+ * Input:
+ *    fmt  - User specified format parameters
+ *    var  - Other format parameters that are not user specifiable
+ *
+ * Return:
+ *    Zero on success; negated errno on failure
+ *
+ ****************************************************************************/
+
+static inline int mkfatfs_writefat(FAR struct fat_format_s *fmt,
+                                   FAR struct fat_var_s *var)
+{
+  off_t offset = fmt->ff_rsvdseccount;
+  int fatno;
+  int sectno;
+  int ret;
+
+  /* Loop for each FAT copy */
+
+  for (fatno = 0; fatno < fmt->ff_nfats; fatno++)
+    {
+      /* Loop for each sector in the FAT */
+
+       for (sectno = 0; sectno < var->fv_nfatsects; sectno++)
+         {
+           memset(var->fv_sect, 0, var->fv_sectorsize);
+
+          /* Mark cluster allocations in sector one of each FAT */
+
+           if (sectno == 0)
+             {
+               memset(var->fv_sect, 0, var->fv_sectorsize);
+               switch(fmt->ff_fattype)
+                 {
+                   case 12:
+                     /* Mark the first two full FAT entries -- 24 bits, 3 bytes total */
+
+                     memset(var->fv_sect, 0xff, 3);
+                     break;
+
+                   case 16:
+                     /* Mark the first two full FAT entries -- 32 bits, 4 bytes total */
+
+                     memset(var->fv_sect, 0xff, 4);
+                     break;
+
+                   case 32:
+                   default: /* Shouldn't happen */
+                     /* Mark the first two full FAT entries -- 64 bits, 8 bytes total */
+
+                     memset(var->fv_sect, 0xff, 8);
+
+                     /* Cluster 2 is used as the root directory.  Mark as EOF */
+
+                     var->fv_sect[8] =  0xf8;
+                     memset(&var->fv_sect[9], 0xff, 3);
+                     break;
+                 }
+
+               /* Save the media type in the first byte of the FAT */
+
+               var->fv_sect[0] = FAT_DEFAULT_MEDIA_TYPE;
+            }
+
+           /* Write the FAT sector */
+
+           ret = DEV_WRITE(var->fv_sect, offset, 1);
+           if (ret < 0)
+             {
+               return ret;
+             }
+           offset++;
+         }
+     }
+   return OK;
+}
+
+/****************************************************************************
+ * Name: mkfatfs_writerootdir
+ *
+ * Description:
+ *   Write the root directory sectors
+ *
+ * Input:
+ *    fmt  - User specified format parameters
+ *    var  - Other format parameters that are not user specifiable
+ *
+ * Return:
+ *    Zero on success; negated errno on failure
+ *
+ ****************************************************************************/
+
+static inline int mkfatfs_writerootdir(FAR struct fat_format_s *fmt,
+                                       FAR struct fat_var_s *var)
+{
+  off_t offset = fmt->ff_rsvdseccount + fmt->ff_nfats * var->fv_nfatsects;
+  int ret;
+  int i;
+
+  /* Write the root directory after the last FAT. This is the root directory
+   * area for FAT12/16, and the first cluster on FAT32.
+   */
+
+  for (i = 0; i < var->fv_nrootdirsects; i++)
+    {
+      /* Format the next sector of the root directory */
+
+      mkfatfs_initrootdir(fmt, var, i);
+
+      /* Write the next sector of the root directory */
+
+      ret = DEV_WRITE(var->fv_sect, offset, 1);
+      if (ret < 0)
+        {
+          return ret;
+        }
+      offset++;
+    }
+  return 0;
+}
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mkfatfs_writefat
+ *
+ * Description:
+ *   Write the configured fat filesystem to the block device
+ *
+ * Input:
+ *    fmt  - Caller specified format parameters
+ *    var  - Other format parameters that are not caller specifiable. (Most
+ *           set by mkfatfs_configfatfs()).
+ *
+ * Return:
+ *    Zero on success; negated errno on failure
+ *
+ ****************************************************************************/
+
+int mkfatfs_writefatfs(FAR struct fat_format_s *fmt,
+                       FAR struct fat_var_s *var)
+{
+  int ret;
+
+  /* Write the master boot record (also the backup and fsinfo sectors) */
+
+  ret = mkfatfs_writembr(fmt, var);
+
+  /* Write FATs */
+
+  if (ret >= 0)
+    {
+      ret = mkfatfs_writefat(fmt, var);
+    }
+
+  /* Write the root directory after the last FAT. */
+
+  if (ret >= 0)
+    {
+      ret = mkfatfs_writerootdir(fmt, var);
+    }
+  return ret;
+}
+