fsal.h

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/*******************************************************************************
 *
 * Filename:
 * ---------
 *   fsal.h
 *
 * Project:
 * --------
 *   MAUI
 *
 * Description:
 * ------------
 *   File System Abstraction Layer, with buffered read/write.
 *
 * Author:
 * -------
 * -------
 *
 *==============================================================================
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/**
 * \file fsal.h
 * \author Murphy Chen
 * \version $Revision:   1.26  $
 * \date $Modtime:   May 16 2005 23:18:18  $
 *
 * FSAL stands for File System Abstraction Layer.
 * This layer provides the following functionalities:
 * - Isolate the underlying file systems.
 * - Provide buffered read/write operations.
 * - Provide bits/bytes accessing functions.
 */

#ifndef __FSAL_BUFFER_H__
#define __FSAL_BUFFER_H__


#ifndef MMI_ON_WIN32
   /// For target and MoDIS
   #define FSAL_VERBOSE 0
   #include "kal_release.h"
   #include "fat_fs.h"
   #include "med_status.h"
   /// access MOD_MED module ID for kal_prompt_trace
   #include "stack_config.h"
   /// for kal_prompt_trace
   #include "kal_trace.h"
   #define FSAL_PLATFORM_KAL 1
   #define FSAL_PLATFORM_WIN32 0
   #define FSAL_PLATFORM_MEMORY 0
#else
   /// For Win32 standalone application, unit test and PC Simulator
   #include <stdio.h>
   #include <assert.h>
   #include <string.h>
   #ifndef ASSERT
      #define ASSERT(x) assert(x)
   #endif
   #define FSAL_VERBOSE 0
   #define kal_mem_cpy(a,b,c) memcpy(a,b,c)
   #include "kal_non_specific_general_types.h"
   #define MED_STAT_FSAL_START 0
   #define FSAL_PLATFORM_KAL 0
   #define FSAL_PLATFORM_WIN32 1
   #define FSAL_PLATFORM_MEMORY 0
#endif

typedef enum {
   FSAL_OK = MED_STAT_FSAL_START,
   FSAL_OPEN_ERROR,
   FSAL_READ_ERROR,
   FSAL_WRITE_ERROR,
   FSAL_SEEK_ERROR,
   FSAL_CLOSE_ERROR,
   FSAL_INVALID_ARGUMENT,
   /// The field of the structure is invalid. Possibly caused by memory corruption.
   FSAL_MEMORY_CORRUPTION,
   FSAL_FATAL_ERROR,
   FSAL_DEVICE_BUSY
} FSAL_Status;



typedef enum {
   /// Open for reading.
   FSAL_READ = 0,
   /// Open for reading and writing.
   /// The file is created if it is not existed, otherwise it is truncated.
   FSAL_WRITE,
   /// Open for reading and appending.
   /// The file is created if it is not existed.
   FSAL_APPEND,
   /// Open a ROM file for reading.
   /// FSAL_Direct_SetRamFileSize shall be called before calling FSAL_Open.
   FSAL_ROMFILE,
   ///
   FSAL_NONBLOCKING = 0x80
} FSAL_FileMode;

/**
 * The memory space of the FSAL structure is prepared by the caller.
 * Accesses to each file requires a separate instance of each FSAL structure.
 * The content of the structuer will be initialized via the FSAL_Open
 * function call.
 * And the pointer to the structure need to be passed as the first argument
 * to each FSAL function invocations.
 */
typedef struct {
   /* file system abstration layer*/
#if FSAL_PLATFORM_KAL
   FS_HANDLE hFile;
   /// error code from file system
   kal_int32 iFSErrorCode;
#elif FSAL_PLATFORM_MEMORY
   kal_uint32 uMaxRamFileSize;
#elif FSAL_PLATFORM_WIN32
   FILE *hFile;
#endif
   /// For ROM file. Point to the start memory address of the file.
   kal_uint8 *pbFile;
   kal_uint32 uRamFileSize;
   kal_uint32 uRamFileOffset;
   kal_uint32 uFileSize;
   kal_uint32 uFileOffset;
   kal_bool bBuffering;
   kal_uint8 *pbBuf;
   kal_uint32 uBufSize;
   kal_uint32 uCachedBlock;
   kal_bool bDirty; /* whether the cache has been written to */
} STFSAL;

/* ------ Private Macros ------ */

#define FSAL_CHECK_ARG(exp) \
   if (!(exp)) \
      return FSAL_INVALID_ARGUMENT

#define FSAL_ASSERT(exp) \
   if (!(exp)) \
      return FSAL_FATAL_ERROR

#define FSAL_ASSERT_NO_RET_VAL(exp) \
   if (!(exp)) \
      return

/* ------ public functions ------ */

/**
 * Open the file.
 *
 * @param pstFSAL pointer to FSAL structure prepared by caller.
 * FSAL will initialize the structure.
 * @param szFile pointer to a string contained the file name when opened in FSAL_READ,
 * FSAL_WRITE, or FSAL_APPEND mode; pointer to the start memory address of the file
 * when opened in FSAL_ROMFILE mode.
 * @param eMode file operation mode.
 *
 * @return If the function succeeds, the return value is FSAL_OK.
 * Otherwise, an error code is returned.
 */
FSAL_Status FSAL_Open(STFSAL *pstFSAL, void *szFile, FSAL_FileMode eMode);

/**
 * Open the file which has been opened via file I/O API with its file handle.
 * Please do not call FSAL_Close for this handle.
 *
 * @param pstFSAL pointer to FSAL structure prepared by caller.
 * FSAL will initialize the structure.
 * @param pFileHandle file handle of the underlying file I/O API.
 *
 * @return If the function succeeds, the return value is FSAL_OK.
 * Otherwise, an error code is returned.
 */
FSAL_Status FSAL_Open_WithHandle(STFSAL *pstFSAL, void *pFileHandle);

/**
 * Open an existing file. When using this interface, you need to consider
 * about the issues of multiple access to the same file.
 * Please do not call FSAL_Close for this handle.
 *
 * @param pstFSAL pointer to FSAL structure prepared by caller.
 * FSAL will initialize the structure.
 * @param pstFSAL_Existing pointer to an existing FSAL structure,
 * FSAL will access file opened via the file handle in that structure.
 *
 * @return If the function succeeds, the return value is FSAL_OK.
 * Otherwise, an error code is returned.
 */
FSAL_Status FSAL_Open_Attach(STFSAL *pstFSAL, STFSAL *pstFSAL_Existing);

/**
 * Client prepares its own buffer and call this function
 * to set buffer for FSAL cache.
 *
 * @param pstFSAL pointer to FSAL structure.
 * @param uBufferSize size of the buffer in unit of byte.
 * @param pbBuf memory location of the buffer
 *
 * @return None.
 */
void FSAL_SetBuffer(STFSAL *pstFSAL, kal_uint32 uBufferSize, kal_uint8 *pbBuf);

/**
 * Flush FSAL cache and close the file.
 *
 * @param pstFSAL pointer to FSAL structure.
 *