root.h

来自「ST5518机顶盒系统文件系统源代码！绝对超值！」· C头文件 代码 · 共 76 行

/******************************************************************************

File Name   : root.h

Description : Functions for manipulating the root sector.

******************************************************************************/

#ifndef  ROOT_H
#define  ROOT_H

    /* Includes ------------------------------------------------------------ */

#include "stcommon.h"
#include "stavfs.h"
#include "internal.h"
#include "avdevice.h"

    /* Exported Types ------------------------------------------------------ */

/* Structure defining the layout of a partitions root sector
   in the first sector in a partition's space */

typedef struct
{
    U16  Unused16_1;     /* Set to zero */
    U8   Unused8_1;
    char Name[9];        /* Partition name */
    U32  Version;        /* Revision of the disk image */
    U16  ClusterSize;    /* in sectors */
    U16  TrackSize;      /* in clusters - reserved - set to 255 */
    U16  StateFlags;     /* 0x0001 - file sys in use */
    U16  Flags;          /* reserved - Set to Zero */
    U64  DataStart;      /* first LBA (sector) of data */
    U64  DataSize;       /* in clusters */
    U64  DirStart;       /* first LBA (sector) filetable */
    U64  Unused64[64-7]; /* reserved - Set to Zero */
    U32  Unused32_1;     /* reserved - Set to Zero */
    U32  CRC;            /* CRC check value */
     
} stavfs_RootSector_t;

    /* Exported Constants -------------------------------------------------- */

#define IMAGE_VERSION              (0X00000002)  /* Revision of the disk image */
#define CLUSTER_IMAGE              (0X80000000)  /* Cluster based disk image   */

#ifndef STAVFS_NO_BACKUP_ON_WRITE
#define BACKUP_ON_WRITE            (0X40000000)  /* Support for backup on write */
#else
#define BACKUP_ON_WRITE            (0X00000000)  /* No support for backup on write */
#endif

#define ROOT_PARTITION_VERSION     (IMAGE_VERSION    | \
                                    CLUSTER_IMAGE    | \
                                    BACKUP_ON_WRITE)

#define ROOT_PARTITION_FLAG_INUSE  (0X0001)
#define ROOT_PARTITION_FLAG_BAD    (0X0002)

#define PARTITION_NAME             "STAVFS"

    /* Exported Variables -------------------------------------------------- */

    /* Exported Macros ----------------------------------------------------- */

    /* Exported Function Prototypes ---------------------------------------- */

ST_ErrorCode_t stavfs_ReadRootSector (stavfs_Device_t *Device, stavfs_RootSector_t *RootSector);
ST_ErrorCode_t stavfs_WriteRootSector(stavfs_Device_t *Device, stavfs_RootSector_t *RootSector);

int stavfs_DoBufferCRC(char *Buff, int Length, U32 *CRCRemainder);


#endif