/**
 * Copyright (c) 2011-2025 Bill Greiman
 * This file is part of the SdFat library for SD memory cards.
 *
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
#pragma once
/**
 * \file
 * \brief ExFatFile class
 */
#include <limits.h>
#include <string.h>

#include "../common/FmtNumber.h"
#include "../common/FsApiConstants.h"
#include "../common/FsDateTime.h"
#include "../common/FsName.h"
#include "ExFatPartition.h"

class ExFatVolume;
//------------------------------------------------------------------------------
/** Expression for path name separator. */
#define isDirSeparator(c) ((c) == '/')
//------------------------------------------------------------------------------
/**
 * \class ExName_t
 * \brief Internal type for file name - do not use in user apps.
 */
class ExName_t : public FsName
{
  public:
    /** Length of UTF-16 name */
    size_t nameLength;
    /** Hash for UTF-16 name */
    uint16_t nameHash;
};
//------------------------------------------------------------------------------
/**
 * \class ExFatFile
 * \brief Basic file class.
 */
class ExFatFile
{
  public:
    /** Create an instance. */
    ExFatFile()
    {
    }
    /**  Create a file object and open it in the current working directory.
     *
     * \param[in] path A path for a file to be opened.
     *
     * \param[in] oflag Values for \a oflag are constructed by a bitwise-inclusive
     * OR of open flags. see FatFile::open(FatFile*, const char*, uint8_t).
     */
    ExFatFile(const char *path, oflag_t oflag)
    {
        open(path, oflag);
    }

    /** Copy from to this.
     * \param[in] from Source file.
     */
    void copy(const ExFatFile *from)
    {
        if (from != this)
        {
#if FILE_COPY_CONSTRUCTOR_SELECT
            *this = *from;
#else  // FILE_COPY_CONSTRUCTOR_SELECT
            memcpy(this, from, sizeof(ExFatFile));
#endif // FILE_COPY_CONSTRUCTOR_SELECT
        }
    }
    /** move from to this.
     * \param[in] from Source file.
     */
    void move(ExFatFile *from)
    {
        if (from != this)
        {
            copy(from);
            from->m_attributes = FILE_ATTR_CLOSED;
        }
    }

#if FILE_COPY_CONSTRUCTOR_SELECT == FILE_COPY_CONSTRUCTOR_PUBLIC
    /** Copy constructor.
     * \param[in] from Move from file.
     *
     */
    ExFatFile(const ExFatFile &from) = default;
    /** Copy assignment operator.
     * \param[in] from Move from file.
     * \return Copied file.
     */
    ExFatFile &operator=(const ExFatFile &from) = default;
#elif FILE_COPY_CONSTRUCTOR_SELECT == FILE_COPY_CONSTRUCTOR_PRIVATE

  private:
    ExFatFile(const ExFatFile &from) = default;
    ExFatFile &operator=(const ExFatFile &from) = default;

  public:
#else  // FILE_COPY_CONSTRUCTOR_SELECT
    ExFatFile(const ExFatFile &from) = delete;
    ExFatFile &operator=(const ExFatFile &from) = delete;
#endif // FILE_COPY_CONSTRUCTOR_SELECT

#if FILE_MOVE_CONSTRUCTOR_SELECT
    /** Move constructor.
     * \param[in] from Move from file.
     */
    ExFatFile(ExFatFile &&from)
    {
        move(&from);
    }
    /** Move assignment operator.
     * \param[in] from Move from file.
     * \return Moved file.
     */
    ExFatFile &operator=(ExFatFile &&from)
    {
        move(&from);
        return *this;
    }
#else // FILE_MOVE_CONSTRUCTOR_SELECT
    ExFatFile(ExFatFile &&from) = delete;
    ExFatFile &operator=(ExFatFile &&from) = delete;
#endif

    /** Destructor */
#if DESTRUCTOR_CLOSES_FILE
    ~ExFatFile()
    {
        if (isOpen())
        {
            close();
        }
    }
#else  // DESTRUCTOR_CLOSES_FILE
    ~ExFatFile() = default;
#endif // DESTRUCTOR_CLOSES_FILE

    /** The parenthesis operator.
     *
     * \return true if a file is open.
     */
    operator bool()
    {
        return isOpen();
    }
    /**
     * \return user settable file attributes for success else -1.
     */
    int attrib()
    {
        return isFileOrSubDir() ? m_attributes & FS_ATTRIB_COPY : -1;
    }
    /** Set file attributes
     *
     * \param[in] bits bit-wise or of selected attributes: FS_ATTRIB_READ_ONLY,
     *            FS_ATTRIB_HIDDEN, FS_ATTRIB_SYSTEM, FS_ATTRIB_ARCHIVE.
     *
     * \note attrib() will fail for set read-only if the file is open for write.
     * \return true for success or false for failure.
     */
    bool attrib(uint8_t bits);
    /** \return The number of bytes available from the current position
     * to EOF for normal files.  INT_MAX is returned for very large files.
     *
     * available64() is recommended for very large files.
     *
     * Zero is returned for directory files.
     *
     */
    int available()
    {
        uint64_t n = available64();
        return n > INT_MAX ? INT_MAX : n;
    }
    /** \return The number of bytes available from the current position
     * to EOF for normal files.  Zero is returned for directory files.
     */
    uint64_t available64()
    {
        return isFile() ? fileSize() - curPosition() : 0;
    }
    /** Clear all error bits. */
    void clearError()
    {
        m_error = 0;
    }
    /** Clear writeError. */
    void clearWriteError()
    {
        m_error &= ~WRITE_ERROR;
    }
    /** Close a file and force cached data and directory information
     *  to be written to the storage device.
     *
     * \return true for success or false for failure.
     */
    bool close();
    /** Check for contiguous file and return its raw sector range.
     *
     * \param[out] bgnSector the first sector address for the file.
     * \param[out] endSector the last sector address for the file.
     *
     * Parameters may be nullptr.
     *
     * \return true for success or false for failure.
     */
    bool contiguousRange(Sector_t *bgnSector, Sector_t *endSector);
    /** \return The current cluster number for a file or directory. */
    Cluster_t curCluster() const
    {
        return m_curCluster;
    }
    /** \return The current position for a file or directory. */
    uint64_t curPosition() const
    {
        return m_curPosition;
    }
    /** \return Total data length for file. */
    uint64_t dataLength() const
    {
        return m_dataLength;
    }
    /** \return Directory entry index. */
    uint32_t dirIndex() const
    {
        return m_dirPos.position / FS_DIR_SIZE;
    }
    /** \return The first cluster number for a file or directory. */
    Cluster_t firstCluster() const
    {
        return m_firstCluster;
    }
    /** Test for the existence of a file in a directory
     *
     * \param[in] path Path of the file to be tested for.
     *
     * The calling instance must be an open directory file.
     *
     * dirFile.exists("TOFIND.TXT") searches for "TOFIND.TXT" in the directory
     * dirFile.
     *
     * \return true if the file exists else false.
     */
    bool exists(const char *path)
    {
        ExFatFile file;
        return file.open(this, path, O_RDONLY);
    }
    /** get position for streams
     * \param[out] pos struct to receive position
     */
    void fgetpos(fspos_t *pos) const;
    /**
     * Get a string from a file.
     *
     * fgets() reads bytes from a file into the array pointed to by \a str, until
     * \a num - 1 bytes are read, or a delimiter is read and transferred to
     * \a str, or end-of-file is encountered. The string is then terminated
     * with a null byte.
     *
     * fgets() deletes CR, '\\r', from the string.  This insures only a '\\n'
     * terminates the string for Windows text files which use CRLF for newline.
     *
     * \param[out] str Pointer to the array where the string is stored.
     * \param[in] num Maximum number of characters to be read
     * (including the final null byte). Usually the length
     * of the array \a str is used.
     * \param[in] delim Optional set of delimiters. The default is "\n".
     *
     * \return For success fgets() returns the length of the string in \a str.
     * If no data is read, fgets() returns zero for EOF or -1 if an error
     * occurred.
     */
    int fgets(char *str, int num, const char *delim = nullptr);
    /** \return The total number of bytes in a file. */
    uint64_t fileSize() const
    {
        return m_dataLength;
    }
    /** \return Address of first sector or zero for empty file. */
    Sector_t firstSector() const;
    /** Set position for streams
     * \param[in] pos struct with value for new position
     */
    void fsetpos(const fspos_t *pos);
    /** Arduino name for sync() */
    void flush()
    {
        sync();
    }
    /** Get a file's access date and time.
     *
     * \param[out] pdate Packed date for directory entry.
     * \param[out] ptime Packed time for directory entry.
     *
     * \return true for success or false for failure.
     */
    bool getAccessDateTime(uint16_t *pdate, uint16_t *ptime);
    /** Get a file's create date and time.
     *
     * \param[out] pdate Packed date for directory entry.
     * \param[out] ptime Packed time for directory entry.
     *
     * \return true for success or false for failure.
     */
    bool getCreateDateTime(uint16_t *pdate, uint16_t *ptime);
    /** \return All error bits. */
    uint8_t getError() const
    {
        return isOpen() ? m_error : 0XFF;
    }
    /** Get a file's modify date and time.
     *
     * \param[out] pdate Packed date for directory entry.
     * \param[out] ptime Packed time for directory entry.
     *
     * \return true for success or false for failure.
     */
    bool getModifyDateTime(uint16_t *pdate, uint16_t *ptime);
    /**
     * Get a file's name followed by a zero.
     *
     * \param[out] name An array of characters for the file's name.
     * \param[in] size The size of the array in characters.
     * \return length for success or zero for failure.
     */
    size_t getName(char *name, size_t size)
    {
#if USE_UTF8_LONG_NAMES
        return getName8(name, size);
#else  // USE_UTF8_LONG_NAMES
        return getName7(name, size);
#endif // USE_UTF8_LONG_NAMES
    }
    /**
     * Get a file's ASCII name followed by a zero.
     *
     * \param[out] name An array of characters for the file's name.
     * \param[in] size The size of the array in characters.
     * \return the name length.
     */
    size_t getName7(char *name, size_t size);
    /**
     * Get a file's UTF-8 name followed by a zero.
     *
     * \param[out] name An array of characters for the file's name.
     * \param[in] size The size of the array in characters.
     * \return the name length.
     */
    size_t getName8(char *name, size_t size);
    /** \return value of writeError */
    bool getWriteError() const
    {
        return isOpen() ? m_error & WRITE_ERROR : true;
    }
    /**
     * Check for FsBlockDevice busy.
     *
     * \return true if busy else false.
     */
    bool isBusy();
    /** \return True if the file is contiguous. */
    bool isContiguous() const
    {
        return m_flags & FILE_FLAG_CONTIGUOUS;
    }
    /** \return True if this is a directory. */
    bool isDir() const
    {
        return m_attributes & FILE_ATTR_DIR;
    }
    /** \return True if this is a normal file. */
    bool isFile() const
    {
        return m_attributes & FILE_ATTR_FILE;
    }
    /** \return True if this is a normal file or sub-directory. */
    bool isFileOrSubDir() const
    {
        return isFile() || isSubDir();
    }
    /** \return True if this is a hidden. */
    bool isHidden() const
    {
        return m_attributes & FS_ATTRIB_HIDDEN;
    }
    /** \return true if the file is open. */
    bool isOpen() const
    {
        return m_attributes;
    }
    /** \return True if file is read-only */
    bool isReadOnly() const
    {
        return m_attributes & FS_ATTRIB_READ_ONLY;
    }
    /** \return True if this is the root directory. */
    bool isRoot() const
    {
        return m_attributes & FILE_ATTR_ROOT;
    }
    /** \return True file is readable. */
    bool isReadable() const
    {
        return m_flags & FILE_FLAG_READ;
    }
    /** \return True if this is a sub-directory. */
    bool isSubDir() const
    {
        return m_attributes & FILE_ATTR_SUBDIR;
    }
    /** \return True if this is a system file. */
    bool isSystem() const
    {
        return m_attributes & FS_ATTRIB_SYSTEM;
    }
    /** \return True file is writable. */
    bool isWritable() const
    {
        return m_flags & FILE_FLAG_WRITE;
    }
    /** List directory contents.
     *
     * \param[in] pr Print stream for list.
     * \return true for success or false for failure.
     */
    bool ls(print_t *pr);
    /** List directory contents.
     *
     * \param[in] pr Print stream for list.
     *
     * \param[in] flags The inclusive OR of
     *
     * LS_DATE - %Print file modification date
     *
     * LS_SIZE - %Print file size.
     *
     * LS_R - Recursive list of sub-directories.
     *
     * \param[in] indent Amount of space before file name. Used for recursive
     * list to indicate sub-directory level.
     *
     * \return true for success or false for failure.
     */
    bool ls(print_t *pr, uint8_t flags, uint8_t indent = 0);
    /** Make a new directory.
     *
     * \param[in] parent An open directory file that will
     *                   contain the new directory.
     *
     * \param[in] path A path with a valid name for the new directory.
     *
     * \param[in] pFlag Create missing parent directories if true.
     *
     * \return true for success or false for failure.
     */
    bool mkdir(ExFatFile *parent, const char *path, bool pFlag = true);
    /** Open a file or directory by name.
     *
     * \param[in] dirFile An open directory containing the file to be opened.
     *
     * \param[in] path The path for a file to be opened.
     *
     * \param[in] oflag Values for \a oflag are constructed by a
     *                  bitwise-inclusive OR of flags from the following list.
     *                  Only one of O_RDONLY, O_READ, O_WRONLY, O_WRITE, or
     *                  O_RDWR is allowed.
     *
     * O_RDONLY - Open for reading.
     *
     * O_READ - Same as O_RDONLY.
     *
     * O_WRONLY - Open for writing.
     *
     * O_WRITE - Same as O_WRONLY.
     *
     * O_RDWR - Open for reading and writing.
     *
     * O_APPEND - If set, the file offset shall be set to the end of the
     * file prior to each write.
     *
     * O_AT_END - Set the initial position at the end of the file.
     *
     * O_CREAT - If the file exists, this flag has no effect except as noted
     * under O_EXCL below. Otherwise, the file shall be created
     *
     * O_EXCL - If O_CREAT and O_EXCL are set, open() shall fail if the file
     * exists.
     *
     * O_TRUNC - If the file exists and is a regular file, and the file is
     * successfully opened and is not read only, its length shall be truncated
     * to 0.
     *
     * WARNING: A given file must not be opened by more than one file object
     * or file corruption may occur.
     *
     * \note Directory files must be opened read only.  Write and truncation is
     * not allowed for directory files.
     *
     * \return true for success or false for failure.
     */
    bool open(ExFatFile *dirFile, const char *path, oflag_t oflag = O_RDONLY);
    /** Open a file in the volume working directory.
     *
     * \param[in] vol Volume where the file is located.
     *
     * \param[in] path with a valid name for a file to be opened.
     *
     * \param[in] oflag bitwise-inclusive OR of open flags.
     *                  See see open(ExFatFile*, const char*, uint8_t).
     *
     * \return true for success or false for failure.
     */
    bool open(ExFatVolume *vol, const char *path, oflag_t oflag = O_RDONLY);
    /** Open a file by index.
     *
     * \param[in] dirFile An open ExFatFile instance for the directory.
     *
     * \param[in] index The \a index of the directory entry for the file to be
     * opened.  The value for \a index is (directory file position)/32.
     *
     * \param[in] oflag bitwise-inclusive OR of open flags.
     *            See see ExFatFile::open(ExFatFile*, const char*, uint8_t).
     *
     * See open() by path for definition of flags.
     * \return true for success or false for failure.
     */
    bool open(ExFatFile *dirFile, uint32_t index, oflag_t oflag = O_RDONLY);
    /** Open a file by index in the current working directory.
     *
     * \param[in] index The \a index of the directory entry for the file to be
     * opened.  The value for \a index is (directory file position)/32.
     *
     * \param[in] oflag bitwise-inclusive OR of open flags.
     *                  See see FatFile::open(FatFile*, const char*, uint8_t).
     *
     * See open() by path for definition of flags.
     * \return true for success or false for failure.
     */
    bool open(uint32_t index, oflag_t oflag = O_RDONLY);
    /** Open a file in the current working directory.
     *
     * \param[in] path A path with a valid name for a file to be opened.
     *
     * \param[in] oflag bitwise-inclusive OR of open flags.
     *                  See see ExFatFile::open(ExFatFile*, const char*, uint8_t).
     *
     * \return true for success or false for failure.
     */
    bool open(const char *path, oflag_t oflag = O_RDONLY);
    /** Open the current working directory.
     *
     * \return true for success or false for failure.
     */
    bool openCwd();
    /** Open the next file or subdirectory in a directory.
     *
     * \param[in] dirFile An open instance for the directory
     *                    containing the file to be opened.
     *
     * \param[in] oflag bitwise-inclusive OR of open flags.
     *                  See see open(ExFatFile*, const char*, uint8_t).
     *
     * \return true for success or false for failure.
     */
    bool openNext(ExFatFile *dirFile, oflag_t oflag = O_RDONLY);
    /** Open a volume's root directory.
     *
     * \param[in] vol The FAT volume containing the root directory to be opened.
     *
     * \return true for success or false for failure.
     */
    bool openRoot(ExFatVolume *vol);
    /** Return the next available byte without consuming it.
     *
     * \return The byte if no error and not at eof else -1;
     */
    int peek();
    /** Allocate contiguous clusters to an empty file.
     *
     * The file must be empty with no clusters allocated.
     *
     * The file will have zero validLength and dataLength
     * will equal the requested length.
     *
     * \param[in] length size of allocated space in bytes.
     * \return true for success or false for failure.
     */
    bool preAllocate(uint64_t length);
    /** Print a file's access date and time
     *
     * \param[in] pr Print stream for output.
     *
     * \return true for success or false for failure.
     */
    size_t printAccessDateTime(print_t *pr);
    /** Print a file's creation date and time
     *
     * \param[in] pr Print stream for output.
     *
     * \return true for success or false for failure.
     */
    size_t printCreateDateTime(print_t *pr);
    /** Print a number followed by a field terminator.
     * \param[in] value The number to be printed.
     * \param[in] term The field terminator.  Use '\\n' for CR LF.
     * \param[in] prec Number of digits after decimal point.
     * \return The number of bytes written or -1 if an error occurs.
     */
    size_t printField(double value, char term, uint8_t prec = 2)
    {
        char buf[24];
        char *str = buf + sizeof(buf);
        if (term)
        {
            *--str = term;
            if (term == '\n')
            {
                *--str = '\r';
            }
        }
        str = fmtDouble(str, value, prec, false);
        return write(str, buf + sizeof(buf) - str);
    }
    /** Print a number followed by a field terminator.
     * \param[in] value The number to be printed.
     * \param[in] term The field terminator.  Use '\\n' for CR LF.
     * \param[in] prec Number of digits after decimal point.
     * \return The number of bytes written or -1 if an error occurs.
     */
    size_t printField(float value, char term, uint8_t prec = 2)
    {
        return printField(static_cast<double>(value), term, prec);
    }
    /** Print a number followed by a field terminator.
     * \param[in] value The number to be printed.
     * \param[in] term The field terminator.  Use '\\n' for CR LF.
     * \return The number of bytes written or -1 if an error occurs.
     */
    template <typename Type> size_t printField(Type value, char term)
    {
        char sign = 0;
        char buf[3 * sizeof(Type) + 3];
        char *str = buf + sizeof(buf);

        if (term)
        {
            *--str = term;
            if (term == '\n')
            {
                *--str = '\r';
            }
        }
        if (value < 0)
        {
            value = -value;
            sign = '-';
        }
        if (sizeof(Type) < 4)
        {
            str = fmtBase10(str, static_cast<uint16_t>(value));
        }
        else
        {
            str = fmtBase10(str, static_cast<uint32_t>(value));
        }
        if (sign)
        {
            *--str = sign;
        }
        return write(str, &buf[sizeof(buf)] - str);
    }
    /** Print a file's size in bytes.
     * \param[in] pr Prtin stream for the output.
     * \return The number of bytes printed.
     */
    size_t printFileSize(print_t *pr);
    /** Print a file's modify date and time
     *
     * \param[in] pr Print stream for output.
     *
     * \return true for success or false for failure.
     */
    size_t printModifyDateTime(print_t *pr);
    /** Print a file's name
     *
     * \param[in] pr Print stream for output.
     *
     * \return length for success or zero for failure.
     */
    size_t printName(print_t *pr)
    {
#if USE_UTF8_LONG_NAMES
        return printName8(pr);
#else  // USE_UTF8_LONG_NAMES
        return printName7(pr);
#endif // USE_UTF8_LONG_NAMES
    }
    /** Print a file's ASCII name
     *
     * \param[in] pr Print stream for output.
     *
     * \return true for success or false for failure.
     */
    size_t printName7(print_t *pr);
    /** Print a file's UTF-8 name
     *
     * \param[in] pr Print stream for output.
     *
     * \return true for success or false for failure.
     */
    size_t printName8(print_t *pr);
    /** Read the next byte from a file.
     *
     * \return For success read returns the next byte in the file as an int.
     * If an error occurs or end of file is reached -1 is returned.
     */
    int read()
    {
        uint8_t b;
        return read(&b, 1) == 1 ? b : -1;
    }
    /** Read data from a file starting at the current position.
     *
     * \param[out] buf Pointer to the location that will receive the data.
     *
     * \param[in] count Maximum number of bytes to read.
     *
     * \return For success read() returns the number of bytes read.
     * A value less than \a nbyte, including zero, will be returned
     * if end of file is reached.
     * If an error occurs, read() returns -1.
     */
    int read(void *buf, size_t count);
    /** Remove a file.
     *
     * The directory entry and all data for the file are deleted.
     *
     * \note This function should not be used to delete the 8.3 version of a
     * file that has a long name. For example if a file has the long name
     * "New Text Document.txt" you should not delete the 8.3 name "NEWTEX~1.TXT".
     *
     * \return true for success or false for failure.
     */
    bool remove();
    /** Remove a file.
     *
     * The directory entry and all data for the file are deleted.
     *
     * \param[in] path Path for the file to be removed.
     *
     * Example use: dirFile.remove(filenameToRemove);
     *
     * \note This function should not be used to delete the 8.3 version of a
     * file that has a long name. For example if a file has the long name
     * "New Text Document.txt" you should not delete the 8.3 name "NEWTEX~1.TXT".
     *
     * \return true for success or false for failure.
     */
    bool remove(const char *path);
    /** Rename a file or subdirectory.
     *
     * \param[in] newPath New path name for the file/directory.
     *
     * \return true for success or false for failure.
     */
    bool rename(const char *newPath);
    /** Rename a file or subdirectory.
     *
     * \param[in] dirFile Directory for the new path.
     * \param[in] newPath New path name for the file/directory.
     *
     * \return true for success or false for failure.
     */
    bool rename(ExFatFile *dirFile, const char *newPath);
    /** Set the file's current position to zero. */
    void rewind()
    {
        seekSet(0);
    }
    /** Remove a directory file.
     *
     * The directory file will be removed only if it is empty and is not the
     * root directory.  rmdir() follows DOS and Windows and ignores the
     * read-only attribute for the directory.
     *
     * \note This function should not be used to delete the 8.3 version of a
     * directory that has a long name. For example if a directory has the
     * long name "New folder" you should not delete the 8.3 name "NEWFOL~1".
     *
     * \return true for success or false for failure.
     */
    bool rmdir();
    /** Set the files position to current position + \a pos. See seekSet().
     * \param[in] offset The new position in bytes from the current position.
     * \return true for success or false for failure.
     */
    bool seekCur(int64_t offset)
    {
        return seekSet(m_curPosition + offset);
    }
    /** Set the files position to end-of-file + \a offset. See seekSet().
     * Can't be used for directory files since file size is not defined.
     * \param[in] offset The new position in bytes from end-of-file.
     * \return true for success or false for failure.
     */
    bool seekEnd(int64_t offset = 0)
    {
        return isFile() ? seekSet(m_dataLength + offset) : false;
    }
    /** Sets a file's position.
     *
     * \param[in] pos The new position in bytes from the beginning of the file.
     *
     * \return true for success or false for failure.
     */
    bool seekSet(uint64_t pos);
    /** \return directory set count */
    uint8_t setCount() const
    {
        return m_setCount;
    }
    /** The sync() call causes all modified data and directory fields
     * to be written to the storage device.
     *
     * \return true for success or false for failure.
     */
    bool sync();
    /** Truncate a file at the current file position.
     *
     * \return true for success or false for failure.
     */
    /** Set a file's timestamps in its directory entry.
     *
     * \param[in] flags Values for \a flags are constructed by a
     * bitwise-inclusive OR of flags from the following list
     *
     * T_ACCESS - Set the file's last access date and time.
     *
     * T_CREATE - Set the file's creation date and time.
     *
     * T_WRITE - Set the file's last write/modification date and time.
     *
     * \param[in] year Valid range 1980 - 2099 inclusive.
     *
     * \param[in] month Valid range 1 - 12 inclusive.
     *
     * \param[in] day Valid range 1 - 31 inclusive.
     *
     * \param[in] hour Valid range 0 - 23 inclusive.
     *
     * \param[in] minute Valid range 0 - 59 inclusive.
     *
     * \param[in] second Valid range 0 - 59 inclusive
     *
     * \note It is possible to set an invalid date since there is no check for
     * the number of days in a month.
     *
     * \note
     * Modify and access timestamps may be overwritten if a date time callback
     * function has been set by dateTimeCallback().
     *
     * \return true for success or false for failure.
     */
    bool timestamp(uint8_t flags, uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute,
                   uint8_t second);
    /** Truncate a file at the current file position.
     * will be maintained if it is less than or equal to \a length otherwise
     * it will be set to end of file.
     *
     * \return true for success or false for failure.
     */
    bool truncate();
    /** Truncate a file to a specified length.  The current file position
     * will be set to end of file.
     *
     * \param[in] length The desired length for the file.
     *
     * \return true for success or false for failure.
     */
    bool truncate(uint64_t length)
    {
        return seekSet(length) && truncate();
    }

    /** \return The valid number of bytes in a file. */
    uint64_t validLength() const
    {
        return m_validLength;
    }
    /** Write a string to a file. Used by the Arduino Print class.
     * \param[in] str Pointer to the string.
     * Use getWriteError to check for errors.
     * \return count of characters written for success or -1 for failure.
     */
    size_t write(const char *str)
    {
        return write(str, strlen(str));
    }
    /** Write a single byte.
     * \param[in] b The byte to be written.
     * \return +1 for success or zero for failure.
     */
    size_t write(uint8_t b)
    {
        return write(&b, 1);
    }
    /** Write data to an open file.
     *
     * \note Data is moved to the cache but may not be written to the
     * storage device until sync() is called.
     *
     * \param[in] buf Pointer to the location of the data to be written.
     *
     * \param[in] count Number of bytes to write.
     *
     * \return For success write() returns the number of bytes written, always
     * \a count. If an error occurs, write() returns zero and writeError is set.
     */
    size_t write(const void *buf, size_t count);
//------------------------------------------------------------------------------
#if ENABLE_ARDUINO_SERIAL
    /** List directory contents.
     *
     * \param[in] flags The inclusive OR of
     *
     * LS_DATE - %Print file modification date
     *
     * LS_SIZE - %Print file size.
     *
     * LS_R - Recursive list of subdirectories.
     *
     * \return true for success or false for failure.
     */
    bool ls(uint8_t flags = 0)
    {
        return ls(&Serial, flags);
    }
    /** Print a file's name.
     *
     * \return length for success or zero for failure.
     */
    size_t printName()
    {
        return ExFatFile::printName(&Serial);
    }
#endif // ENABLE_ARDUINO_SERIAL

  private:
    /** ExFatVolume allowed access to private members. */
    friend class ExFatVolume;
    bool addCluster();
    bool addDirCluster();
    bool cmpName(const DirName_t *dirName, ExName_t *fname);
    uint8_t *dirCache(uint8_t set, uint8_t options);
    bool hashName(ExName_t *fname);
    bool mkdir(ExFatFile *parent, ExName_t *fname);

    bool openPrivate(ExFatFile *dir, ExName_t *fname, oflag_t oflag);
    bool parsePathName(const char *path, ExName_t *fname, const char **ptr);
    ExFatVolume *volume() const
    {
        return m_vol;
    }
    bool syncDir();
    //----------------------------------------------------------------------------
    static const uint8_t WRITE_ERROR = 0X1;
    static const uint8_t READ_ERROR = 0X2;

    /** This file has not been opened. */
    static const uint8_t FILE_ATTR_CLOSED = 0;
    /** Entry for normal data file */
    static const uint8_t FILE_ATTR_FILE = 0X08;
    /** Entry is for a subdirectory */
    static const uint8_t FILE_ATTR_SUBDIR = FS_ATTRIB_DIRECTORY;
    /** Root directory */
    static const uint8_t FILE_ATTR_ROOT = 0X40;
    /** Directory type bits */
    static const uint8_t FILE_ATTR_DIR = FILE_ATTR_SUBDIR | FILE_ATTR_ROOT;

    static const uint8_t FILE_FLAG_READ = 0X01;
    static const uint8_t FILE_FLAG_WRITE = 0X02;
    static const uint8_t FILE_FLAG_APPEND = 0X08;
    static const uint8_t FILE_FLAG_CONTIGUOUS = 0X40;
    static const uint8_t FILE_FLAG_DIR_DIRTY = 0X80;

    uint64_t m_curPosition;
    uint64_t m_dataLength;
    uint64_t m_validLength;
    Cluster_t m_curCluster;
    Cluster_t m_firstCluster;
    ExFatVolume *m_vol;
    DirPos_t m_dirPos;
    uint8_t m_setCount;
    uint8_t m_attributes = FILE_ATTR_CLOSED;
    uint8_t m_error = 0;
    uint8_t m_flags = 0;
};
#include "../common/ArduinoFiles.h"
/**
 * \class ExFile
 * \brief exFAT file with Arduino Stream.
 */
class ExFile : public StreamFile<ExFatFile, uint64_t>
{
  public:
    ExFile()
    {
    }
    /** Create an open ExFile.
     * \param[in] path path for file.
     * \param[in] oflag open flags.
     */
    ExFile(const char *path, oflag_t oflag)
    {
        open(path, oflag);
    }
    /** Opens the next file or folder in a directory.
     *
     * \param[in] oflag open flags.
     * \return a FatStream object.
     */
    ExFile openNextFile(oflag_t oflag = O_RDONLY)
    {
        ExFile tmpFile;
        tmpFile.openNext(this, oflag);
        return tmpFile;
    }
};
