<p>The FIL structure (file object) holds state of an open file. It is initialzed by f_open function and discarded by f_close function. There is no member that can be changed by the application program.</p>
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typedef struct _FIL_ {
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FATFS* fs; /* Pointer to the owner file system object */
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WORD id; /* Owner file system mount ID */
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BYTE flag; /* File status flags */
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BYTE csect; /* Sector address in the cluster */
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DWORD fptr; /* File R/W pointer */
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DWORD fsize; /* File size */
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DWORD org_clust; /* File start cluster */
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DWORD curr_clust; /* Current cluster */
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DWORD dsect; /* Current data sector */
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#if !_FS_READONLY
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DWORD dir_sect; /* Sector containing the directory entry */
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BYTE* dir_ptr; /* Ponter to the directory entry in the window */
