/**
 * 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 FatFile class
 */
#include <limits.h>
#include <stddef.h>
#include <string.h>

#include "../common/FmtNumber.h"
#include "../common/FsApiConstants.h"
#include "../common/FsDateTime.h"
#include "../common/FsName.h"
#include "FatPartition.h"
class FatVolume;
//------------------------------------------------------------------------------
/**
 * \struct FatPos_t
 * \brief Internal type for file position - do not use in user apps.
 */
struct FatPos_t
{
    /** stream position */
    uint32_t position;
    /** cluster for position */
    Cluster_t cluster;
};
//------------------------------------------------------------------------------
/** Expression for path name separator. */
#define isDirSeparator(c) ((c) == '/')
//------------------------------------------------------------------------------
/**
 * \class FatLfn_t
 * \brief Internal type for Long File Name - do not use in user apps.
 */

class FatLfn_t : public FsName
{
  public:
    /** UTF-16 length of Long File Name */
    size_t len;
    /** Position for sequence number. */
    uint8_t seqPos;
    /** Flags for base and extension character case and LFN. */
    uint8_t flags;
    /** Short File Name */
    uint8_t sfn[11];
};
/**
 * \class FatSfn_t
 * \brief Internal type for Short 8.3 File Name - do not use in user apps.
 */
class FatSfn_t
{
  public:
    /** Flags for base and extension character case and LFN. */
    uint8_t flags;
    /** Short File Name */
    uint8_t sfn[11];
};

#if USE_LONG_FILE_NAMES
/** Internal class for file names */
typedef FatLfn_t FatName_t;
#else  // USE_LONG_FILE_NAMES
/** Internal class for file names */
typedef FatSfn_t FatName_t;
#endif // USE_LONG_FILE_NAMES

/** Derived from a LFN with loss or conversion of characters. */
const uint8_t FNAME_FLAG_LOST_CHARS = 0X01;
/** Base-name or extension has mixed case. */
const uint8_t FNAME_FLAG_MIXED_CASE = 0X02;
/** LFN entries are required for file name. */
const uint8_t FNAME_FLAG_NEED_LFN = FNAME_FLAG_LOST_CHARS | FNAME_FLAG_MIXED_CASE;
/** Filename base-name is all lower case */
const uint8_t FNAME_FLAG_LC_BASE = FAT_CASE_LC_BASE;
/** Filename extension is all lower case. */
const uint8_t FNAME_FLAG_LC_EXT = FAT_CASE_LC_EXT;
//==============================================================================
/**
 * \class FatFile
 * \brief Basic file class.
 */
class FatFile
{
  public:
    /** Create an instance. */
    FatFile()
    {
    }
    /**  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).
     */
    FatFile(const char *path, oflag_t oflag)
    {
        open(path, oflag);
    }

    /** Copy from to this.
     * \param[in] from Source file.
     */
    void copy(const FatFile *from)
    {
        if (from != this)
        {
#if FILE_COPY_CONSTRUCTOR_SELECT
            *this = *from;
#else  // FILE_COPY_CONSTRUCTOR_SELECT
            memcpy(this, from, sizeof(FatFile));
#endif // FILE_COPY_CONSTRUCTOR_SELECT
        }
    }
    /** move from to this.
     * \param[in] from Source file.
     */
    void move(FatFile *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.
     *
     */
    FatFile(const FatFile &from) = default;
    /** Copy assignment operator.
     * \param[in] from Move from file.
     * \return Copied file.
     */
    FatFile &operator=(const FatFile &from) = default;
#elif FILE_COPY_CONSTRUCTOR_SELECT == FILE_COPY_CONSTRUCTOR_PRIVATE

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

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

#if FILE_MOVE_CONSTRUCTOR_SELECT
    /** Move constructor.
     * \param[in] from Move from file.
     */
    FatFile(FatFile &&from)
    {
        move(&from);
    }
    /** Move assignment operator.
     * \param[in] from Move from file.
     * \return Moved file.
     */
    FatFile &operator=(FatFile &&from)
    {
        move(&from);
        return *this;
    }
#else // FILE_MOVE_CONSTRUCTOR_SELECT
    FatFile(FatFile &&from) = delete;
    FatFile &operator=(FatFile &&from) = delete;
#endif
    /** Destructor */
#if DESTRUCTOR_CLOSES_FILE
    ~FatFile()
    {
        if (isOpen())
        {
            close();
        }
    }
#else  // DESTRUCTOR_CLOSES_FILE
    ~FatFile() = default;
#endif // DESTRUCTOR_CLOSES_FILE

    /** The parenthesis operator.
     *
     * \return true if a file is open.
     */
    operator bool() const
    {
        return isOpen();
    }
    /**
     * \return user settable file attributes for success else -1.
     */
    int attrib()
    {
        return isFileOrSubDir() ? m_attributes & FS_ATTRIB_USER_SETTABLE : -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.
     *
     * available32() is recomended for very large files.
     *
     * Zero is returned for directory files.
     *
     */
    int available() const
    {
        uint32_t n = available32();
        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.
     */
    uint32_t available32() const
    {
        return isFile() ? fileSize() - curPosition() : 0;
    }
    /** Clear all error bits. */
    void clearError()
    {
        m_error = 0;
    }
    /** Set writeError to zero */
    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.
     *
     * Set the contiguous flag if the file is contiguous.
     * The parameters may be nullptr to only set the flag.
     * \return true for success or false for failure.
     */
    bool contiguousRange(Sector_t *bgnSector, Sector_t *endSector);
    /** Create and open a new contiguous file of a specified size.
     *
     * \param[in] dirFile The directory where the file will be created.
     * \param[in] path A path with a valid file name.
     * \param[in] size The desired file size.
     *
     * \return true for success or false for failure.
     */
    bool createContiguous(FatFile *dirFile, const char *path, uint32_t size);
    /** Create and open a new contiguous file of a specified size.
     *
     * \param[in] path A path with a valid file name.
     * \param[in] size The desired file size.
     *
     * \return true for success or false for failure.
     */
    bool createContiguous(const char *path, uint32_t size);
    /** \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. */
    uint32_t curPosition() const
    {
        return m_curPosition;
    }
    /** Return a file's directory entry.
     *
     * \param[out] dir Location for return of the file's directory entry.
     *
     * \return true for success or false for failure.
     */
    bool dirEntry(DirFat_t *dir);
    /** \return Directory entry index. */
    uint16_t dirIndex() const
    {
        return m_dirIndex;
    }
    /** \return The number of bytes allocated to a directory or zero
     *         if an error occurs.
     */
    uint32_t dirSize();
    /** Dump file in Hex
     * \param[in] pr Print stream for list.
     * \param[in] pos Start position in file.
     * \param[in] n number of locations to dump.
     */
    void dmpFile(print_t *pr, uint32_t pos, size_t n);
    /** 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.
     */
    bool exists(const char *path)
    {
        FatFile 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 first cluster number for a file or directory. */
    Cluster_t firstCluster() const
    {
        return m_firstCluster;
    }
    /** \return The total number of bytes in a file. */
    uint32_t fileSize() const
    {
        return m_fileSize;
    }
    /** \return first sector of file or zero for empty file. */
    Sector_t firstBlock() const
    {
        return firstSector();
    }
    /** \return Address of first sector or zero for empty file. */
    Sector_t firstSector() const;
    /** Arduino name for sync() */
    void flush()
    {
        sync();
    }
    /** set position for streams
     * \param[in] pos struct with value for new position
     */
    void fsetpos(const fspos_t *pos);
    /** Get a file's access date.
     *
     * \param[out] pdate Packed date for directory entry.
     *
     * \return true for success or false for failure.
     */
    bool getAccessDate(uint16_t *pdate);
    /** Get a file's access date and time.
     *
     * \param[out] pdate Packed date for directory entry.
     * \param[out] ptime return zero since FAT has no time.
     *
     * This function is for comparability in FsFile.
     *
     * \return true for success or false for failure.
     */
    bool getAccessDateTime(uint16_t *pdate, uint16_t *ptime)
    {
        if (!getAccessDate(pdate))
        {
            return false;
        }
        *ptime = 0;
        return true;
    }
    /** 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 m_error;
    }
    /** 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 byte.
     *
     * \param[out] name An array of characters for the file's name.
     * \param[in] size The size of the array in bytes. The array
     *             must be at least 13 bytes long.
     * \return length for success or zero for failure.
     */
    size_t getName(char *name, size_t size);
    /**
     * 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 length for success or zero for failure.
     */
    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 length for success or zero for failure.
     */
    size_t getName8(char *name, size_t size);
#ifndef DOXYGEN_SHOULD_SKIP_THIS
    size_t __attribute__((error("use getSFN(name, size)"))) getSFN(char *name);
#endif // DOXYGEN_SHOULD_SKIP_THIS
    /**
     * Get a file's Short File Name followed by a zero byte.
     *
     * \param[out] name An array of characters for the file's name.
     *                  The array should be at least 13 bytes long.
     * \param[in] size size of name array.
     * \return true for success or false for failure.
     */
    size_t getSFN(char *name, size_t size);
    /** \return value of writeError */
    bool getWriteError() const
    {
        return isOpen() ? m_error & WRITE_ERROR : true;
    }
    /**
     * Check for device busy.
     *
     * \return true if busy else false.
     */
    bool isBusy();
#if USE_FAT_FILE_FLAG_CONTIGUOUS
    /** \return True if the file is contiguous. */
    bool isContiguous() const
    {
        return m_flags & FILE_FLAG_CONTIGUOUS;
    }
#endif // USE_FAT_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 file. */
    bool isHidden() const
    {
        return m_attributes & FS_ATTRIB_HIDDEN;
    }
    /** \return true if this file has a Long File Name. */
    bool isLFN() const
    {
        return m_lfnOrd;
    }
    /** \return True if this is an open file/directory. */
    bool isOpen() const
    {
        return m_attributes;
    }
    /** \return True file is readable. */
    bool isReadable() const
    {
        return m_flags & FILE_FLAG_READ;
    }
    /** \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 if this is the FAT32 root directory. */
    bool isRoot32() const
    {
        return m_attributes & FILE_ATTR_ROOT32;
    }
    /** \return True if this is the FAT12 of FAT16 root directory. */
    bool isRootFixed() const
    {
        return m_attributes & FILE_ATTR_ROOT_FIXED;
    }
    /** \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.
     *
     * \param[in] flags The inclusive OR of
     *
     * LS_DATE - %Print file modification date
     *
     * LS_SIZE - %Print file size.
     *
     * LS_R - Recursive list of subdirectories.
     *
     * \param[in] indent Amount of space before file name. Used for recursive
     * list to indicate subdirectory level.
     *
     * \return true for success or false for failure.
     */
    bool ls(print_t *pr, uint8_t flags = 0, uint8_t indent = 0);
    /** Make a new directory.
     *
     * \param[in] dir An open FatFile instance for the directory 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(FatFile *dir, const char *path, bool pFlag = true);
    /** Open a file in the volume root 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 FatFile::open(FatFile*, const char*, uint8_t).
     *
     * \return true for success or false for failure.
     */
    bool open(FatVolume *vol, const char *path, oflag_t oflag = O_RDONLY);
    /** Open a file by index.
     *
     * \param[in] dirFile An open FatFile 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 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(FatFile *dirFile, uint16_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(uint16_t index, oflag_t oflag = O_RDONLY);
    /** Open a file or directory by name.
     *
     * \param[in] dirFile An open FatFile instance for the directory containing
     *                    the file to be opened.
     *
     * \param[in] path A path with a valid name 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 FatFile 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(FatFile *dirFile, const char *path, oflag_t oflag = O_RDONLY);
    /** Open a file in the current working volume.
     *
     * \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 FatFile::open(FatFile*, 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 existing file wih Short 8.3 names.
     * \param[in] path with short 8.3 names.
     *
     * the purpose of this function is to save flash on Uno
     * and other small boards.
     *
     * Directories will be opened O_RDONLY, files O_RDWR.
     * \return true for success or false for failure.
     */
    bool openExistingSFN(const char *path);
    /** Open the next file or subdirectory in a directory.
     *
     * \param[in] dirFile An open FatFile instance for the directory
     *                    containing the file to be opened.
     *
     * \param[in] oflag bitwise-inclusive OR of open flags.
     *                  See see FatFile::open(FatFile*, const char*, uint8_t).
     *
     * \return true for success or false for failure.
     */
    bool openNext(FatFile *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(FatVolume *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 contain uninitialized data.
     *
     * \param[in] length size of the file in bytes.
     * \return true for success or false for failure.
     */
    bool preAllocate(uint32_t length);
    /** Print a file's access date
     *
     * \param[in] pr Print stream for output.
     *
     * \return The number of characters printed.
     */
    size_t printAccessDate(print_t *pr);
    /** Print a file's access date
     *
     * \param[in] pr Print stream for output.
     *
     * \return The number of characters printed.
     */
    size_t printAccessDateTime(print_t *pr)
    {
        return printAccessDate(pr);
    }
    /** Print a file's creation date and time
     *
     * \param[in] pr Print stream for output.
     *
     * \return The number of bytes printed.
     */
    size_t printCreateDateTime(print_t *pr);
    /** %Print a directory date field.
     *
     *  Format is yyyy-mm-dd.
     *
     * \param[in] pr Print stream for output.
     * \param[in] fatDate The date field from a directory entry.
     */
    static void printFatDate(print_t *pr, uint16_t fatDate);
    /** %Print a directory time field.
     *
     * Format is hh:mm:ss.
     *
     * \param[in] pr Print stream for output.
     * \param[in] fatTime The time field from a directory entry.
     */
    static void printFatTime(print_t *pr, uint16_t fatTime);
    /** 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.
     *
     * \param[in] pr Print stream for output.
     *
     * \return The number of characters printed is returned
     *         for success and zero is returned for failure.
     */
    size_t printFileSize(print_t *pr);
    /** Print a file's modify date and time
     *
     * \param[in] pr Print stream for output.
     *
     * \return The number of characters printed.
     */
    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);
    /** 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);
    /** Print a file's Short File Name.
     *
     * \param[in] pr Print stream for output.
     *
     * \return The number of characters printed is returned
     *         for success and zero is returned for failure.
     */
    size_t printSFN(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)
    {
        return readPrivate(buf, count, nullptr);
    }
    /** Read the next directory entry from a directory file.
     *
     * \param[out] dir The DirFat_t struct that will receive the data.
     *
     * \return For success readDir() returns the number of bytes read.
     * A value of zero will be returned if end of file is reached.
     * If an error occurs, readDir() returns -1.  Possible errors include
     * readDir() called before a directory has been opened, this is not
     * a directory file or an I/O error occurred.
     */
    int8_t readDir(DirFat_t *dir);
    /** 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.
     * \note the renamed file will be moved to the current volume working
     * directory.
     *
     * \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(FatFile *dirFile, const char *newPath);
    /** Set the file's current position to zero. */
    void rewind()
    {
        seekSet(0UL);
    }
    /** 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();
    /** Recursively delete a directory and all contained files.
     *
     * This is like the Unix/Linux 'rm -rf *' if called with the root directory
     * hence the name.
     *
     * Warning - This will remove all contents of the directory including
     * subdirectories.  The directory will then be removed if it is not root.
     * The read-only attribute for files will be ignored.
     *
     * \note This function should not be used to delete the 8.3 version of
     * a directory that has a long name.  See remove() and rmdir().
     *
     * \return true for success or false for failure.
     */
    bool rmRfStar();
    /** 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(int32_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(int32_t offset = 0)
    {
        return isFile() ? seekSet(m_fileSize + 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(uint32_t pos);
    /** 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();
    /** 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.
     *
     * 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(uint32_t length)
    {
        return seekSet(length) && truncate();
    }
    /** 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 -1 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 FatFile::printName(&Serial);
    }
#endif // ENABLE_ARDUINO_SERIAL

  private:
    /** FatVolume allowed access to private members. */
    friend class FatVolume;

    /** 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;
    /** A FAT12 or FAT16 root directory */
    static const uint8_t FILE_ATTR_ROOT_FIXED = 0X40;
    /** A FAT32 root directory */
    static const uint8_t FILE_ATTR_ROOT32 = 0X80;
    /** Entry is for root. */
    static const uint8_t FILE_ATTR_ROOT = FILE_ATTR_ROOT_FIXED | FILE_ATTR_ROOT32;
    /** Directory type bits */
    static const uint8_t FILE_ATTR_DIR = FILE_ATTR_SUBDIR | FILE_ATTR_ROOT;

    // private functions

    bool addCluster();
    bool addDirCluster();
    DirFat_t *cacheDir(uint16_t index)
    {
        return seekSet(32UL * index) ? readDirCache() : nullptr;
    }
    DirFat_t *cacheDirEntry(uint8_t action);
    bool cmpName(uint16_t index, FatLfn_t *fname, uint8_t lfnOrd);
    bool createLFN(uint16_t index, FatLfn_t *fname, uint8_t lfnOrd);
    uint16_t getLfnChar(const DirLfn_t *ldir, uint8_t i);
    uint8_t lfnChecksum(const uint8_t *name)
    {
        uint8_t sum = 0;
        for (uint8_t i = 0; i < 11; i++)
        {
            sum = (((sum & 1) << 7) | (sum >> 1)) + name[i];
        }
        return sum;
    }
    static bool makeSFN(FatLfn_t *fname);
    bool makeUniqueSfn(FatLfn_t *fname);
    bool openCluster(FatFile *file);
    bool parsePathName(const char *str, FatLfn_t *fname, const char **ptr);
    bool parsePathName(const char *str, FatSfn_t *fname, const char **ptr);
    bool mkdir(FatFile *parent, FatName_t *fname);
    bool open(FatFile *dirFile, FatLfn_t *fname, oflag_t oflag);
    bool open(FatFile *dirFile, const FatSfn_t *fname, oflag_t oflag);
    bool openSFN(const FatSfn_t *fname);
    bool openCachedEntry(FatFile *dirFile, uint16_t cacheIndex, oflag_t oflag, uint8_t lfnOrd);
    DirFat_t *readDirCache();
    int readPrivate(void *buf, size_t nbyte, DirFat_t **cache);
    // bits defined in m_flags
    static const uint8_t FILE_FLAG_READ = 0X01;
    static const uint8_t FILE_FLAG_WRITE = 0X02;
    static const uint8_t FILE_FLAG_APPEND = 0X08;
    // treat curPosition as valid length.
    static const uint8_t FILE_FLAG_PREALLOCATE = 0X20;
    // file is contiguous
    static const uint8_t FILE_FLAG_CONTIGUOUS = 0X40;
    // sync of directory entry required
    static const uint8_t FILE_FLAG_DIR_DIRTY = 0X80;

    // private data
    static const uint8_t WRITE_ERROR = 0X1;
    static const uint8_t READ_ERROR = 0X2;

    uint8_t m_attributes = FILE_ATTR_CLOSED;
    uint8_t m_error = 0; // Error bits.
    uint8_t m_flags = 0; // See above for definition of m_flags bits
    uint8_t m_lfnOrd;
    uint16_t m_dirIndex; // index of directory entry in dir file
    FatVolume *m_vol;    // volume where file is located
    Cluster_t m_dirCluster;
    Cluster_t m_curCluster;   // cluster for current file position
    uint32_t m_curPosition;   // current file position
    Sector_t m_dirSector;     // sector for this files directory entry
    uint32_t m_fileSize;      // file size in bytes
    Cluster_t m_firstCluster; // first cluster of file
};

#include "../common/ArduinoFiles.h"
/**
 * \class File32
 * \brief FAT16/FAT32 file with Arduino Stream.
 */
class File32 : public StreamFile<FatFile, uint32_t>
{
  public:
    File32()
    {
    }
    /** Create an open File32.
     * \param[in] path path for file.
     * \param[in] oflag open flags.
     */
    File32(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.
     */
    File32 openNextFile(oflag_t oflag = O_RDONLY)
    {
        File32 tmpFile;
        tmpFile.openNext(this, oflag);
        return tmpFile;
    }
};
