4 * This file is part of BeRTOS.
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14 * GNU General Public License for more details.
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21 * library without restriction. Specifically, if other files instantiate
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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
35 * \author Francesco Sacchi <batt@develer.com>
37 * \brief BattFS: a filesystem for embedded platforms (interface).
43 #include <cfg/compiler.h> // uintXX_t; STATIC_ASSERT
47 * \note fields order is chosen to comply with alignment.
49 typedef struct BattFsPageHeader
51 uint16_t filled; ///< filled bytes in page.
52 uint16_t page_off; ///< Page offset inside file.
53 uint8_t inode; ///< File inode (file identifier).
54 uint8_t seqnum; ///< bit[1:0]: Page sequence number; bit[7:2] unused for now, must be set to 1.
55 uint16_t crc; ///< CRC of the page header.
58 STATIC_ASSERT(sizeof(BattFsPageHeader) == 8);
61 * Reset page sequence number of struct \a m to default value (0xFF).
63 #define RESET_SEQ(m) ((m).seqnum = 0xFF)
66 * Get page sequence number from struct \a m.
68 #define SEQ(m) ((m).seqnum & 0x03)
71 * Set sequence number of struct \a m to \a d.
73 #define SET_SEQ(m, d) ((m).seqnum = ((m).seqnum & 0xFC) | ((d) & 0x03))
76 * Increment sequence number of struct \a m.
78 #define INC_SEQ(m) SET_SEQ((m), SEQ(m) + 1)
81 #endif /* FS_BATTFS_H */