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-/* Arduino FAT16 Library
- * Copyright (C) 2008 by William Greiman
- *
- * This file is part of the Arduino FAT16 Library
- *
- * This Library is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This Library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
-
- * You should have received a copy of the GNU General Public License
- * along with the Arduino Fat16 Library. If not, see
- * <http://www.gnu.org/licenses/>.
- */
-#ifndef Fat16_h
-#define Fat16_h
-/**
- * \file
- * Fat16 class
- */
-#include <string.h>
-#include <avr/pgmspace.h>
-#include <Print.h>
-#include <SdCard.h>
-#include <FatStructs.h>
-#include <Fat16Config.h>
-//------------------------------------------------------------------------------
-/** Fat16 version YYYYMMDD */
-#define FAT16_VERSION 20111205
-//------------------------------------------------------------------------------
-// flags for ls()
-/** ls() flag to print modify date */
-uint8_t const LS_DATE = 1;
-/** ls() flag to print file size */
-uint8_t const LS_SIZE = 2;
-
-// use the gnu style oflags
-/** open for reading */
-uint8_t const O_READ = 0X01;
-/** same as O_READ */
-uint8_t const O_RDONLY = O_READ;
-/** open for write */
-uint8_t const O_WRITE = 0X02;
-/** same as O_WRITE */
-uint8_t const O_WRONLY = O_WRITE;
-/** open for reading and writing */
-uint8_t const O_RDWR = O_READ | O_WRITE;
-/** mask for access modes */
-uint8_t const O_ACCMODE = O_READ | O_WRITE;
-/** The file offset shall be set to the end of the file prior to each write. */
-uint8_t const O_APPEND = 0X04;
-/** synchronous writes - call sync() after each write */
-uint8_t const O_SYNC = 0X08;
-/** create the file if nonexistent */
-uint8_t const O_CREAT = 0X10;
-/** If O_CREAT and O_EXCL are set, open() shall fail if the file exists */
-uint8_t const O_EXCL = 0X20;
-/** truncate the file to zero length */
-uint8_t const O_TRUNC = 0X40;
-
-// flags for timestamp
-/** set the file's last access date */
-uint8_t const T_ACCESS = 1;
-/** set the file's creation date and time */
-uint8_t const T_CREATE = 2;
-/** Set the file's write date and time */
-uint8_t const T_WRITE = 4;
-
-/** date field for FAT directory entry */
-static inline uint16_t FAT_DATE(uint16_t year, uint8_t month, uint8_t day) {
- return (year - 1980) << 9 | month << 5 | day;
-}
-/** year part of FAT directory date field */
-static inline uint16_t FAT_YEAR(uint16_t fatDate) {
- return 1980 + (fatDate >> 9);
-}
-/** month part of FAT directory date field */
-static inline uint8_t FAT_MONTH(uint16_t fatDate) {
- return (fatDate >> 5) & 0XF;
-}
-/** day part of FAT directory date field */
-static inline uint8_t FAT_DAY(uint16_t fatDate) {
- return fatDate & 0X1F;
-}
-/** time field for FAT directory entry */
-static inline uint16_t FAT_TIME(uint8_t hour, uint8_t minute, uint8_t second) {
- return hour << 11 | minute << 5 | second >> 1;
-}
-/** hour part of FAT directory time field */
-static inline uint8_t FAT_HOUR(uint16_t fatTime) {
- return fatTime >> 11;
-}
-/** minute part of FAT directory time field */
-static inline uint8_t FAT_MINUTE(uint16_t fatTime) {
- return(fatTime >> 5) & 0X3F;
-}
-/** second part of FAT directory time field */
-static inline uint8_t FAT_SECOND(uint16_t fatTime) {
- return 2*(fatTime & 0X1F);
-}
-/** Default date for file timestamps is 1 Jan 2000 */
-uint16_t const FAT_DEFAULT_DATE = ((2000 - 1980) << 9) | (1 << 5) | 1;
-/** Default time for file timestamp is 1 am */
-uint16_t const FAT_DEFAULT_TIME = (1 << 11);
-//------------------------------------------------------------------------------
-/**
- * \typedef fat_t
- *
- * \brief Type for FAT16 entry
- */
-typedef uint16_t fat_t;
-/**
- * \union cache16_t
- *
- * \brief Cache buffer data type
- *
- */
-union cache16_t {
- /** Used to access cached file data blocks. */
- uint8_t data[512];
- /** Used to access cached FAT entries. */
- fat_t fat[256];
- /** Used to access cached directory entries. */
- dir_t dir[16];
- /** Used to access a cached Master Boot Record. */
- mbr_t mbr;
- /** Used to access to a cached FAT16 boot sector. */
- fbs_t fbs;
-};
-//------------------------------------------------------------------------------
-/** \class Fat16
- * \brief Fat16 implements a minimal Arduino FAT16 Library
- *
- * Fat16 does not support subdirectories or long file names.
- */
-class Fat16 : public Print {
- public:
- /*
- * Public functions
- */
- /** create with file closed */
- Fat16(void) : flags_(0) {}
- /** \return The current cluster number. */
- fat_t curCluster(void) const {return curCluster_;}
- uint8_t close(void);
- /** \return The count of clusters in the FAT16 volume. */
- static fat_t clusterCount(void) {return clusterCount_;}
- /** \return The number of 512 byte blocks in a cluster */
- static uint8_t clusterSize(void) {return blocksPerCluster_;}
- /** \return The current file position. */
- uint32_t curPosition(void) const {return curPosition_;}
- /**
- * Set the date/time callback function
- *
- * \param[in] dateTime The user's callback function. The callback
- * function is of the form:
- *
- * \code
- * void dateTime(uint16_t* date, uint16_t* time) {
- * uint16_t year;
- * uint8_t month, day, hour, minute, second;
- *
- * // User gets date and time from GPS or real-time clock here
- *
- * // return date using FAT_DATE macro to format fields
- * *date = FAT_DATE(year, month, day);
- *
- * // return time using FAT_TIME macro to format fields
- * *time = FAT_TIME(hour, minute, second);
- * }
- * \endcode
- *
- * Sets the function that is called when a file is created or when
- * a file's directory entry is modified by sync(). All timestamps,
- * access, creation, and modify, are set when a file is created.
- * sync() maintains the last access date and last modify date/time.
- *
- * See the timestamp() function.
- */
- static void dateTimeCallback(
- void (*dateTime)(uint16_t* date, uint16_t* time)) {
- dateTime_ = dateTime;
- }
- /**
- * Cancel the date/time callback function.
- */
- static void dateTimeCallbackCancel(void) {dateTime_ = NULL;}
- uint8_t dirEntry(dir_t* dir);
-
- /** \return The file's size in bytes. */
- uint32_t fileSize(void) const {return fileSize_;}
- static uint8_t init(SdCard* dev, uint8_t part);
- /**
- * Initialize a FAT16 volume.
- *
- * First try partition 1 then try super floppy format.
- *
- * \param[in] dev The SdCard where the volume is located.
- *
- * \return The value one, true, is returned for success and
- * the value zero, false, is returned for failure. reasons for
- * failure include not finding a valid FAT16 file system, a call
- * to init() after a volume has been successful initialized or
- * an I/O error.
- *
- */
- static uint8_t init(SdCard* dev) {
- return init(dev, 1) ? true : init(dev, 0);
- }
- /**
- * Checks the file's open/closed status for this instance of Fat16.
- * \return The value true if a file is open otherwise false;
- */
- uint8_t isOpen(void) const {return (flags_ & O_ACCMODE) != 0;}
- static void ls(uint8_t flags = 0);
- uint8_t open(const char* fileName, uint8_t oflag);
- uint8_t open(uint16_t entry, uint8_t oflag);
- static void printDirName(const dir_t& dir, uint8_t width);
- static void printFatDate(uint16_t fatDate);
- static void printFatTime(uint16_t fatTime);
- static void printTwoDigits(uint8_t v);
- int16_t read(void);
- int16_t read(void* buf, uint16_t nbyte);
- static uint8_t readDir(dir_t* dir, uint16_t* index,
- uint8_t skip = (DIR_ATT_VOLUME_ID | DIR_ATT_DIRECTORY));
-
- uint8_t remove(void);
- static uint8_t remove(const char* fileName);
- /** Sets the file's current position to zero. */
- void rewind(void) {curPosition_ = curCluster_ = 0;}
- /** \return The number of entries in the root directory. */
- static uint16_t rootDirEntryCount(void) {return rootDirEntryCount_;}
- /** Seek to current position plus \a pos bytes. See Fat16::seekSet(). */
- uint8_t seekCur(uint32_t pos) {return seekSet(curPosition_ + pos);}
- /** Seek to end of file. See Fat16::seekSet(). */
- uint8_t seekEnd(void) {return seekSet(fileSize_);}
- uint8_t seekSet(uint32_t pos);
- uint8_t sync(void);
- uint8_t timestamp(uint8_t flag, uint16_t year, uint8_t month, uint8_t day,
- uint8_t hour, uint8_t minute, uint8_t second);
- uint8_t truncate(uint32_t size);
- /** Fat16::writeError is set to true if an error occurs during a write().
- * Set Fat16::writeError to false before calling print() and/or write() and check
- * for true after calls to write() and/or print().
- */
- bool writeError;
- int16_t write(const void *buf, uint16_t nbyte);
-#if ARDUINO < 100
- void write(uint8_t b);
- void write(const char* str);
-#else // ARDUINO < 100
- size_t write(uint8_t b);
- int16_t write(const char* str);
-#endif // ARDUINO < 100
- void write_P(PGM_P str);
- void writeln_P(PGM_P str);
-//------------------------------------------------------------------------------
-#if FAT16_DEBUG_SUPPORT
- /** For debug only. Do not use in applications. */
- static cache16_t* dbgBufAdd(void) {return &cacheBuffer_;}
- /** For debug only. Do not use in applications. */
- static void dbgSetDev(SdCard* dev) {rawDev_ = dev;}
- /** For debug only. Do not use in applications. */
- static uint8_t* dbgCacheBlock(uint32_t blockNumber) {
- return cacheRawBlock(blockNumber) ? cacheBuffer_.data : 0; }
- /** For debug only. Do not use in applications. */
- static dir_t* dbgCacheDir(uint16_t index) {
- return cacheDirEntry(index);}
-#endif // FAT16_DEBUG_SUPPORT
-//------------------------------------------------------------------------------
-#if ALLOW_DEPRECATED_FUNCTIONS
-// Deprecated functions - suppress cpplint messages with NOLINT comment
- public:
- /**
- * Deprecated - Use:
- * static void Fat16::dateTimeCallback(
- * void (*dateTime)(uint16_t* date, uint16_t* time));
- */
- static void dateTimeCallback(
- void (*dateTime)(uint16_t& date, uint16_t& time)) { // NOLINT
- oldDateTime_ = dateTime;
- dateTime_ = dateTime ? oldToNew : 0;
- }
- /** Deprecated - Use: uint8_t Fat16::dirEntry(dir_t* dir); */
- uint8_t dirEntry(dir_t& dir) { // NOLINT
- return dirEntry(&dir);
- }
- /** Deprecated - Use: static uint8_t Fat16::init(SdCard *dev); */
- static uint8_t init(SdCard& dev) {return init(&dev);} // NOLINT
-
- /** Deprecated - Use: static uint8_t Fat16::init(SdCard *dev, uint8_t part) */
- static uint8_t init(SdCard& dev, uint8_t part) { // NOLINT
- return init(&dev, part);
- }
- /**
- * Deprecated - Use:
- * uint8_t Fat16::readDir(dir_t* dir, uint16_t* index, uint8_t skip);
- */
- static uint8_t readDir(dir_t& dir, uint16_t& index, // NOLINT
- uint8_t skip = (DIR_ATT_VOLUME_ID | DIR_ATT_DIRECTORY)) {
- return readDir(&dir, &index, skip);
- }
-//------------------------------------------------------------------------------
- private:
- static void (*oldDateTime_)(uint16_t& date, uint16_t& time); // NOLINT
- static void oldToNew(uint16_t *date, uint16_t *time) {
- uint16_t d;
- uint16_t t;
- oldDateTime_(d, t);
- *date = d;
- *time = t;
- }
-#endif // ALLOW_DEPRECATED_FUNCTIONS
-//------------------------------------------------------------------------------
- private:
- // Volume info
- static uint8_t volumeInitialized_; // true if volume has been initialized
- static uint8_t fatCount_; // number of FATs
- static uint8_t blocksPerCluster_; // must be power of 2
- static uint16_t rootDirEntryCount_; // should be 512 for FAT16
- static fat_t blocksPerFat_; // number of blocks in one FAT
- static fat_t clusterCount_; // total clusters in volume
- static uint32_t fatStartBlock_; // start of first FAT
- static uint32_t rootDirStartBlock_; // start of root dir
- static uint32_t dataStartBlock_; // start of data clusters
-
- // block cache
- static uint8_t const CACHE_FOR_READ = 0; // cache a block for read
- static uint8_t const CACHE_FOR_WRITE = 1; // cache a block and set dirty
- static SdCard *rawDev_; // Device
- static cache16_t cacheBuffer_; // 512 byte cache for raw blocks
- static uint32_t cacheBlockNumber_; // Logical number of block in the cache
- static uint8_t cacheDirty_; // cacheFlush() will write block if true
- static uint32_t cacheMirrorBlock_; // mirror block for second FAT
-
- // callback function for date/time
- static void (*dateTime_)(uint16_t* date, uint16_t* time);
-
- // define fields in flags_
- static uint8_t const F_OFLAG = O_ACCMODE | O_APPEND | O_SYNC;
- static uint8_t const F_FILE_DIR_DIRTY = 0X80; // require sync directory entry
-
- uint8_t flags_; // see above for bit definitions
- int16_t dirEntryIndex_; // index of directory entry for open file
- fat_t firstCluster_; // first cluster of file
- uint32_t fileSize_; // fileSize
- fat_t curCluster_; // current cluster
- uint32_t curPosition_; // current byte offset
-
- // private functions for cache
- static uint8_t blockOfCluster(uint32_t position) {
- // depends on blocks per cluster being power of two
- return (position >> 9) & (blocksPerCluster_ - 1);
- }
- static uint16_t cacheDataOffset(uint32_t position) {return position & 0X1FF;}
- static dir_t* cacheDirEntry(uint16_t index, uint8_t action = 0);
- static uint8_t cacheRawBlock(uint32_t blockNumber, uint8_t action = 0);
- static uint8_t cacheFlush(void);
- static void cacheSetDirty(void) {cacheDirty_ |= CACHE_FOR_WRITE;}
- static uint32_t dataBlockLba(fat_t cluster, uint8_t blockOfCluster) {
- return dataStartBlock_ + (uint32_t)(cluster - 2) * blocksPerCluster_
- + blockOfCluster;
- }
- static uint8_t fatGet(fat_t cluster, fat_t* value);
- static uint8_t fatPut(fat_t cluster, fat_t value);
- // end of chain test
- static uint8_t isEOC(fat_t cluster) {return cluster >= 0XFFF8;}
- // allocate a cluster to a file
- uint8_t addCluster(void);
- // free a cluster chain
- uint8_t freeChain(fat_t cluster);
-};
-#endif // Fat16_h
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