avdevice.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 89 行

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

File Name :  avdevice.h

Description: Device related types, definitions and structures.

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

#ifndef  DEVICE_H
#define  DEVICE_H

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

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

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

#define CLOSED_FILE             NULL

#define ROOT_SECTOR_AREA_SIZE   (2)      /* Number of sectors in the root area in each partition */
#define MAX_CLUSTERS_PER_BLOCK  (255)


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



typedef struct
{
    /* Device administration */
        
    ST_DeviceName_t  DeviceName;
    BOOL             DeviceActive;   /* If the device is not active you have a stale handle */
    semaphore_t      DeviceLock;     /* Protect against multi-reentrant calls */
    partition_t     *MemoryPartition;

    int              OpenHandles;    /* The number of open handles on the device */

    /* Disk partition access */
        
    void            *HALData;
    U16              Partition;      /* This is our partition number */
                                              
    /* Root sector info */
    
    U64              RootSectorLBA;   /* LBA address of the root sector  */
    U16              ClusterSize;     /* Size = 2^ClusterSize sectors    */
    U32              NumClusterBlock; /* The number of cluster block in the file area */
    U64              RootDirLBA;      /* LBA address of the Root Directory */
    U64              DataStartLBA;    /* LBA address of file data area   */
    U64              DataSize;        /* Size in sectors.                */
    
    void            *RWCache;        /* Internal data for the R/W Cache */
    void            *RootDir;        /* Internal data for the Root Directory */
    void            *MCat;           /* Internal data for the Master CAT */
}
stavfs_Device_t;




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

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

#define FILE_BACKUP_SIZE(Device_p)   ((LOCAL_CAT_SIZE > (Device_p)->ClusterSize)?(LOCAL_CAT_SIZE):((Device_p)->ClusterSize))
#define CLUSTERS_PER_BLOCK(Device_p) (MAX_CLUSTERS_PER_BLOCK)
#define CLUSTER_BLOCK_SIZE(Device_p) (LOCAL_CAT_SIZE + FILE_BACKUP_SIZE(Device_p) + (Device_p)->ClusterSize*CLUSTERS_PER_BLOCK(Device_p))
                                       
    /* Exported Function Prototypes ---------------------------------------- */

void stavfs_GetBackupLBA  (stavfs_Device_t *Device_p, U64 const *LBA_p, U64 *BackupLBA_p);
void stavfs_GetLocalCatLBA(stavfs_Device_t *Device_p, U64 const *LBA_p, U64 *CatLBA_p);

void stavfs_GetClusterIdx (stavfs_Device_t *Device_p, U32 *BlockId_p, U32 *Idx_p, U64 const *LBA_p);
void stavfs_GetClusterLBA (stavfs_Device_t *Device_p, U32  BlockId,   U8   Idx,   U64 *LBA_p);
void stavfs_GetLCatLBA    (stavfs_Device_t *Device_p, U32  BlockId,   U64 *LBA_p);

/* Utility functions from stavfs.c */

stavfs_Device_t *stavfs_GetDevice     (ST_DeviceName_t Name);
ST_ErrorCode_t   stavfs_ValidateDevice(stavfs_Device_t *Device_p);


#endif