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1264 lines
41 KiB
C++
1264 lines
41 KiB
C++
/* Arduino SdFat Library
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* Copyright (C) 2009 by William Greiman
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*
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* This file is part of the Arduino SdFat Library
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino SdFat Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "SdFat.h"
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#ifdef __AVR__
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#include <avr/pgmspace.h>
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#endif
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#include <Arduino.h>
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//------------------------------------------------------------------------------
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// callback function for date/time
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void (*SdFile::dateTime_)(uint16_t* date, uint16_t* time) = NULL;
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#if ALLOW_DEPRECATED_FUNCTIONS
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// suppress cpplint warnings with NOLINT comment
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void (*SdFile::oldDateTime_)(uint16_t& date, uint16_t& time) = NULL; // NOLINT
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#endif // ALLOW_DEPRECATED_FUNCTIONS
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//------------------------------------------------------------------------------
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// add a cluster to a file
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uint8_t SdFile::addCluster() {
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if (!vol_->allocContiguous(1, &curCluster_)) return false;
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// if first cluster of file link to directory entry
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if (firstCluster_ == 0) {
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firstCluster_ = curCluster_;
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flags_ |= F_FILE_DIR_DIRTY;
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}
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return true;
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}
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//------------------------------------------------------------------------------
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// Add a cluster to a directory file and zero the cluster.
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// return with first block of cluster in the cache
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uint8_t SdFile::addDirCluster(void) {
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if (!addCluster()) return false;
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// zero data in cluster insure first cluster is in cache
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uint32_t block = vol_->clusterStartBlock(curCluster_);
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for (uint8_t i = vol_->blocksPerCluster_; i != 0; i--) {
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if (!SdVolume::cacheZeroBlock(block + i - 1)) return false;
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}
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// Increase directory file size by cluster size
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fileSize_ += 512UL << vol_->clusterSizeShift_;
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return true;
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}
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//------------------------------------------------------------------------------
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// cache a file's directory entry
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// return pointer to cached entry or null for failure
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dir_t* SdFile::cacheDirEntry(uint8_t action) {
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if (!SdVolume::cacheRawBlock(dirBlock_, action)) return NULL;
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return SdVolume::cacheBuffer_.dir + dirIndex_;
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}
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//------------------------------------------------------------------------------
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/**
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* Close a file and force cached data and directory information
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* to be written to the storage device.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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* Reasons for failure include no file is open or an I/O error.
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*/
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uint8_t SdFile::close(void) {
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if (!sync())return false;
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type_ = FAT_FILE_TYPE_CLOSED;
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return true;
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}
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//------------------------------------------------------------------------------
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/**
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* Check for contiguous file and return its raw block range.
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*
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* \param[out] bgnBlock the first block address for the file.
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* \param[out] endBlock the last block address for the file.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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* Reasons for failure include file is not contiguous, file has zero length
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* or an I/O error occurred.
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*/
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uint8_t SdFile::contiguousRange(uint32_t* bgnBlock, uint32_t* endBlock) {
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// error if no blocks
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if (firstCluster_ == 0) return false;
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for (uint32_t c = firstCluster_; ; c++) {
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uint32_t next;
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if (!vol_->fatGet(c, &next)) return false;
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// check for contiguous
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if (next != (c + 1)) {
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// error if not end of chain
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if (!vol_->isEOC(next)) return false;
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*bgnBlock = vol_->clusterStartBlock(firstCluster_);
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*endBlock = vol_->clusterStartBlock(c)
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+ vol_->blocksPerCluster_ - 1;
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return true;
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}
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}
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}
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//------------------------------------------------------------------------------
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/**
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* Create and open a new contiguous file of a specified size.
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*
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* \note This function only supports short DOS 8.3 names.
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* See open() for more information.
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*
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* \param[in] dirFile The directory where the file will be created.
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* \param[in] fileName A valid DOS 8.3 file name.
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* \param[in] size The desired file size.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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* Reasons for failure include \a fileName contains
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* an invalid DOS 8.3 file name, the FAT volume has not been initialized,
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* a file is already open, the file already exists, the root
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* directory is full or an I/O error.
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*
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*/
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uint8_t SdFile::createContiguous(SdFile* dirFile,
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const char* fileName, uint32_t size) {
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// don't allow zero length file
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if (size == 0) return false;
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if (!open(dirFile, fileName, O_CREAT | O_EXCL | O_RDWR)) return false;
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// calculate number of clusters needed
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uint32_t count = ((size - 1) >> (vol_->clusterSizeShift_ + 9)) + 1;
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// allocate clusters
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if (!vol_->allocContiguous(count, &firstCluster_)) {
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remove();
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return false;
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}
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fileSize_ = size;
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// insure sync() will update dir entry
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flags_ |= F_FILE_DIR_DIRTY;
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return sync();
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}
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//------------------------------------------------------------------------------
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/**
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* Return a files directory entry
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*
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* \param[out] dir Location for return of the files directory entry.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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uint8_t SdFile::dirEntry(dir_t* dir) {
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// make sure fields on SD are correct
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if (!sync()) return false;
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// read entry
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dir_t* p = cacheDirEntry(SdVolume::CACHE_FOR_READ);
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if (!p) return false;
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// copy to caller's struct
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memcpy(dir, p, sizeof(dir_t));
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return true;
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}
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//------------------------------------------------------------------------------
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/**
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* Format the name field of \a dir into the 13 byte array
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* \a name in standard 8.3 short name format.
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*
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* \param[in] dir The directory structure containing the name.
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* \param[out] name A 13 byte char array for the formatted name.
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*/
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void SdFile::dirName(const dir_t& dir, char* name) {
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uint8_t j = 0;
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for (uint8_t i = 0; i < 11; i++) {
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if (dir.name[i] == ' ')continue;
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if (i == 8) name[j++] = '.';
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name[j++] = dir.name[i];
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}
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name[j] = 0;
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}
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//------------------------------------------------------------------------------
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/** List directory contents to Serial.
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*
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* \param[in] flags The inclusive OR of
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*
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* LS_DATE - %Print file modification date
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*
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* LS_SIZE - %Print file size.
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*
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* LS_R - Recursive list of subdirectories.
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*
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* \param[in] indent Amount of space before file name. Used for recursive
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* list to indicate subdirectory level.
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*/
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void SdFile::ls(uint8_t flags, uint8_t indent) {
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dir_t* p;
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rewind();
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while ((p = readDirCache())) {
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// done if past last used entry
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if (p->name[0] == DIR_NAME_FREE) break;
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// skip deleted entry and entries for . and ..
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if (p->name[0] == DIR_NAME_DELETED || p->name[0] == '.') continue;
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// only list subdirectories and files
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if (!DIR_IS_FILE_OR_SUBDIR(p)) continue;
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// print any indent spaces
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for (int8_t i = 0; i < indent; i++) Serial.print(' ');
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// print file name with possible blank fill
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printDirName(*p, flags & (LS_DATE | LS_SIZE) ? 14 : 0);
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// print modify date/time if requested
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if (flags & LS_DATE) {
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printFatDate(p->lastWriteDate);
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Serial.print(' ');
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printFatTime(p->lastWriteTime);
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}
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// print size if requested
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if (!DIR_IS_SUBDIR(p) && (flags & LS_SIZE)) {
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Serial.print(' ');
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Serial.print(p->fileSize);
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}
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Serial.println();
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// list subdirectory content if requested
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if ((flags & LS_R) && DIR_IS_SUBDIR(p)) {
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uint16_t index = curPosition()/32 - 1;
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SdFile s;
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if (s.open(this, index, O_READ)) s.ls(flags, indent + 2);
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seekSet(32 * (index + 1));
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}
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}
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}
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//------------------------------------------------------------------------------
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// format directory name field from a 8.3 name string
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uint8_t SdFile::make83Name(const char* str, uint8_t* name) {
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uint8_t c;
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uint8_t n = 7; // max index for part before dot
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uint8_t i = 0;
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// blank fill name and extension
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while (i < 11) name[i++] = ' ';
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i = 0;
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while ((c = *str++) != '\0') {
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if (c == '.') {
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if (n == 10) return false; // only one dot allowed
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n = 10; // max index for full 8.3 name
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i = 8; // place for extension
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} else {
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// illegal FAT characters
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uint8_t b;
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#if defined(__AVR__)
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PGM_P p = PSTR("|<>^+=?/[];,*\"\\");
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while ((b = pgm_read_byte(p++))) if (b == c) return false;
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#elif defined(__arm__)
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const uint8_t valid[] = "|<>^+=?/[];,*\"\\";
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const uint8_t *p = valid;
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while ((b = *p++)) if (b == c) return false;
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#endif
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// check size and only allow ASCII printable characters
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if (i > n || c < 0X21 || c > 0X7E)return false;
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// only upper case allowed in 8.3 names - convert lower to upper
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name[i++] = c < 'a' || c > 'z' ? c : c + ('A' - 'a');
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}
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}
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// must have a file name, extension is optional
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return name[0] != ' ';
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}
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//------------------------------------------------------------------------------
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/** Make a new directory.
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*
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* \param[in] dir An open SdFat instance for the directory that will containing
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* the new directory.
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*
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* \param[in] dirName A valid 8.3 DOS name for the new directory.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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* Reasons for failure include this SdFile is already open, \a dir is not a
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* directory, \a dirName is invalid or already exists in \a dir.
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*/
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uint8_t SdFile::makeDir(SdFile* dir, const char* dirName) {
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dir_t d;
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// create a normal file
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if (!open(dir, dirName, O_CREAT | O_EXCL | O_RDWR)) return false;
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// convert SdFile to directory
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flags_ = O_READ;
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type_ = FAT_FILE_TYPE_SUBDIR;
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// allocate and zero first cluster
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if (!addDirCluster())return false;
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// force entry to SD
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if (!sync()) return false;
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// cache entry - should already be in cache due to sync() call
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dir_t* p = cacheDirEntry(SdVolume::CACHE_FOR_WRITE);
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if (!p) return false;
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// change directory entry attribute
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p->attributes = DIR_ATT_DIRECTORY;
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// make entry for '.'
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memcpy(&d, p, sizeof(d));
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for (uint8_t i = 1; i < 11; i++) d.name[i] = ' ';
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d.name[0] = '.';
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// cache block for '.' and '..'
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uint32_t block = vol_->clusterStartBlock(firstCluster_);
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if (!SdVolume::cacheRawBlock(block, SdVolume::CACHE_FOR_WRITE)) return false;
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// copy '.' to block
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memcpy(&SdVolume::cacheBuffer_.dir[0], &d, sizeof(d));
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// make entry for '..'
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d.name[1] = '.';
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if (dir->isRoot()) {
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d.firstClusterLow = 0;
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d.firstClusterHigh = 0;
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} else {
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d.firstClusterLow = dir->firstCluster_ & 0XFFFF;
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d.firstClusterHigh = dir->firstCluster_ >> 16;
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}
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// copy '..' to block
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memcpy(&SdVolume::cacheBuffer_.dir[1], &d, sizeof(d));
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// set position after '..'
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curPosition_ = 2 * sizeof(d);
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// write first block
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return SdVolume::cacheFlush();
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}
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//------------------------------------------------------------------------------
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/**
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* Open a file or directory by name.
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*
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* \param[in] dirFile An open SdFat instance for the directory containing the
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* file to be opened.
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*
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* \param[in] fileName A valid 8.3 DOS name for a file to be opened.
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*
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* \param[in] oflag Values for \a oflag are constructed by a bitwise-inclusive
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* OR of flags from the following list
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*
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* O_READ - Open for reading.
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*
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* O_RDONLY - Same as O_READ.
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*
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* O_WRITE - Open for writing.
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*
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* O_WRONLY - Same as O_WRITE.
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*
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* O_RDWR - Open for reading and writing.
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*
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* O_APPEND - If set, the file offset shall be set to the end of the
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* file prior to each write.
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*
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* O_CREAT - If the file exists, this flag has no effect except as noted
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* under O_EXCL below. Otherwise, the file shall be created
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*
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* O_EXCL - If O_CREAT and O_EXCL are set, open() shall fail if the file exists.
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*
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* O_SYNC - Call sync() after each write. This flag should not be used with
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* write(uint8_t), write_P(PGM_P), writeln_P(PGM_P), or the Arduino Print class.
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* These functions do character at a time writes so sync() will be called
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* after each byte.
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*
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* O_TRUNC - If the file exists and is a regular file, and the file is
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* successfully opened and is not read only, its length shall be truncated to 0.
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*
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* \note Directory files must be opened read only. Write and truncation is
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* not allowed for directory files.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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* Reasons for failure include this SdFile is already open, \a difFile is not
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* a directory, \a fileName is invalid, the file does not exist
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* or can't be opened in the access mode specified by oflag.
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*/
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uint8_t SdFile::open(SdFile* dirFile, const char* fileName, uint8_t oflag) {
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uint8_t dname[11];
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dir_t* p;
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// error if already open
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if (isOpen())return false;
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if (!make83Name(fileName, dname)) return false;
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vol_ = dirFile->vol_;
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dirFile->rewind();
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// bool for empty entry found
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uint8_t emptyFound = false;
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// search for file
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while (dirFile->curPosition_ < dirFile->fileSize_) {
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uint8_t index = 0XF & (dirFile->curPosition_ >> 5);
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p = dirFile->readDirCache();
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if (p == NULL) return false;
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if (p->name[0] == DIR_NAME_FREE || p->name[0] == DIR_NAME_DELETED) {
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// remember first empty slot
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if (!emptyFound) {
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emptyFound = true;
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dirIndex_ = index;
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dirBlock_ = SdVolume::cacheBlockNumber_;
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}
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// done if no entries follow
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if (p->name[0] == DIR_NAME_FREE) break;
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} else if (!memcmp(dname, p->name, 11)) {
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// don't open existing file if O_CREAT and O_EXCL
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if ((oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) return false;
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// open found file
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return openCachedEntry(0XF & index, oflag);
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}
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}
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// only create file if O_CREAT and O_WRITE
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if ((oflag & (O_CREAT | O_WRITE)) != (O_CREAT | O_WRITE)) return false;
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// cache found slot or add cluster if end of file
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if (emptyFound) {
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p = cacheDirEntry(SdVolume::CACHE_FOR_WRITE);
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if (!p) return false;
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} else {
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if (dirFile->type_ == FAT_FILE_TYPE_ROOT16) return false;
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// add and zero cluster for dirFile - first cluster is in cache for write
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if (!dirFile->addDirCluster()) return false;
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// use first entry in cluster
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dirIndex_ = 0;
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p = SdVolume::cacheBuffer_.dir;
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}
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// initialize as empty file
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memset(p, 0, sizeof(dir_t));
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memcpy(p->name, dname, 11);
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// set timestamps
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if (dateTime_) {
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// call user function
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dateTime_(&p->creationDate, &p->creationTime);
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} else {
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// use default date/time
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p->creationDate = FAT_DEFAULT_DATE;
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p->creationTime = FAT_DEFAULT_TIME;
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}
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p->lastAccessDate = p->creationDate;
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p->lastWriteDate = p->creationDate;
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p->lastWriteTime = p->creationTime;
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// force write of entry to SD
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if (!SdVolume::cacheFlush()) return false;
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// open entry in cache
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return openCachedEntry(dirIndex_, oflag);
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}
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//------------------------------------------------------------------------------
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/**
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* Open a file by index.
|
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*
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* \param[in] dirFile An open SdFat instance for the directory.
|
|
*
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* \param[in] index The \a index of the directory entry for the file to be
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* opened. The value for \a index is (directory file position)/32.
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*
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* \param[in] oflag Values for \a oflag are constructed by a bitwise-inclusive
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* OR of flags O_READ, O_WRITE, O_TRUNC, and O_SYNC.
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*
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* See open() by fileName for definition of flags and return values.
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*
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*/
|
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uint8_t SdFile::open(SdFile* dirFile, uint16_t index, uint8_t oflag) {
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// error if already open
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if (isOpen())return false;
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// don't open existing file if O_CREAT and O_EXCL - user call error
|
|
if ((oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) return false;
|
|
|
|
vol_ = dirFile->vol_;
|
|
|
|
// seek to location of entry
|
|
if (!dirFile->seekSet(32 * index)) return false;
|
|
|
|
// read entry into cache
|
|
dir_t* p = dirFile->readDirCache();
|
|
if (p == NULL) return false;
|
|
|
|
// error if empty slot or '.' or '..'
|
|
if (p->name[0] == DIR_NAME_FREE ||
|
|
p->name[0] == DIR_NAME_DELETED || p->name[0] == '.') {
|
|
return false;
|
|
}
|
|
// open cached entry
|
|
return openCachedEntry(index & 0XF, oflag);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
// open a cached directory entry. Assumes vol_ is initializes
|
|
uint8_t SdFile::openCachedEntry(uint8_t dirIndex, uint8_t oflag) {
|
|
// location of entry in cache
|
|
dir_t* p = SdVolume::cacheBuffer_.dir + dirIndex;
|
|
|
|
// write or truncate is an error for a directory or read-only file
|
|
if (p->attributes & (DIR_ATT_READ_ONLY | DIR_ATT_DIRECTORY)) {
|
|
if (oflag & (O_WRITE | O_TRUNC)) return false;
|
|
}
|
|
// remember location of directory entry on SD
|
|
dirIndex_ = dirIndex;
|
|
dirBlock_ = SdVolume::cacheBlockNumber_;
|
|
|
|
// copy first cluster number for directory fields
|
|
firstCluster_ = (uint32_t)p->firstClusterHigh << 16;
|
|
firstCluster_ |= p->firstClusterLow;
|
|
|
|
// make sure it is a normal file or subdirectory
|
|
if (DIR_IS_FILE(p)) {
|
|
fileSize_ = p->fileSize;
|
|
type_ = FAT_FILE_TYPE_NORMAL;
|
|
} else if (DIR_IS_SUBDIR(p)) {
|
|
if (!vol_->chainSize(firstCluster_, &fileSize_)) return false;
|
|
type_ = FAT_FILE_TYPE_SUBDIR;
|
|
} else {
|
|
return false;
|
|
}
|
|
// save open flags for read/write
|
|
flags_ = oflag & (O_ACCMODE | O_SYNC | O_APPEND);
|
|
|
|
// set to start of file
|
|
curCluster_ = 0;
|
|
curPosition_ = 0;
|
|
|
|
// truncate file to zero length if requested
|
|
if (oflag & O_TRUNC) return truncate(0);
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Open a volume's root directory.
|
|
*
|
|
* \param[in] vol The FAT volume containing the root directory to be opened.
|
|
*
|
|
* \return The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
* Reasons for failure include the FAT volume has not been initialized
|
|
* or it a FAT12 volume.
|
|
*/
|
|
uint8_t SdFile::openRoot(SdVolume* vol) {
|
|
// error if file is already open
|
|
if (isOpen()) return false;
|
|
|
|
if (vol->fatType() == 16) {
|
|
type_ = FAT_FILE_TYPE_ROOT16;
|
|
firstCluster_ = 0;
|
|
fileSize_ = 32 * vol->rootDirEntryCount();
|
|
} else if (vol->fatType() == 32) {
|
|
type_ = FAT_FILE_TYPE_ROOT32;
|
|
firstCluster_ = vol->rootDirStart();
|
|
if (!vol->chainSize(firstCluster_, &fileSize_)) return false;
|
|
} else {
|
|
// volume is not initialized or FAT12
|
|
return false;
|
|
}
|
|
vol_ = vol;
|
|
// read only
|
|
flags_ = O_READ;
|
|
|
|
// set to start of file
|
|
curCluster_ = 0;
|
|
curPosition_ = 0;
|
|
|
|
// root has no directory entry
|
|
dirBlock_ = 0;
|
|
dirIndex_ = 0;
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/** %Print the name field of a directory entry in 8.3 format to Serial.
|
|
*
|
|
* \param[in] dir The directory structure containing the name.
|
|
* \param[in] width Blank fill name if length is less than \a width.
|
|
*/
|
|
void SdFile::printDirName(const dir_t& dir, uint8_t width) {
|
|
uint8_t w = 0;
|
|
for (uint8_t i = 0; i < 11; i++) {
|
|
if (dir.name[i] == ' ')continue;
|
|
if (i == 8) {
|
|
Serial.print('.');
|
|
w++;
|
|
}
|
|
Serial.write(dir.name[i]);
|
|
w++;
|
|
}
|
|
if (DIR_IS_SUBDIR(&dir)) {
|
|
Serial.print('/');
|
|
w++;
|
|
}
|
|
while (w < width) {
|
|
Serial.print(' ');
|
|
w++;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/** %Print a directory date field to Serial.
|
|
*
|
|
* Format is yyyy-mm-dd.
|
|
*
|
|
* \param[in] fatDate The date field from a directory entry.
|
|
*/
|
|
void SdFile::printFatDate(uint16_t fatDate) {
|
|
Serial.print(FAT_YEAR(fatDate));
|
|
Serial.print('-');
|
|
printTwoDigits(FAT_MONTH(fatDate));
|
|
Serial.print('-');
|
|
printTwoDigits(FAT_DAY(fatDate));
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/** %Print a directory time field to Serial.
|
|
*
|
|
* Format is hh:mm:ss.
|
|
*
|
|
* \param[in] fatTime The time field from a directory entry.
|
|
*/
|
|
void SdFile::printFatTime(uint16_t fatTime) {
|
|
printTwoDigits(FAT_HOUR(fatTime));
|
|
Serial.print(':');
|
|
printTwoDigits(FAT_MINUTE(fatTime));
|
|
Serial.print(':');
|
|
printTwoDigits(FAT_SECOND(fatTime));
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/** %Print a value as two digits to Serial.
|
|
*
|
|
* \param[in] v Value to be printed, 0 <= \a v <= 99
|
|
*/
|
|
void SdFile::printTwoDigits(uint8_t v) {
|
|
char str[3];
|
|
str[0] = '0' + v/10;
|
|
str[1] = '0' + v % 10;
|
|
str[2] = 0;
|
|
Serial.print(str);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Read data from a file starting at the current position.
|
|
*
|
|
* \param[out] buf Pointer to the location that will receive the data.
|
|
*
|
|
* \param[in] nbyte 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. Possible errors include
|
|
* read() called before a file has been opened, corrupt file system
|
|
* or an I/O error occurred.
|
|
*/
|
|
int16_t SdFile::read(void* buf, uint16_t nbyte) {
|
|
uint8_t* dst = reinterpret_cast<uint8_t*>(buf);
|
|
|
|
// error if not open or write only
|
|
if (!isOpen() || !(flags_ & O_READ)) return -1;
|
|
|
|
// max bytes left in file
|
|
if (nbyte > (fileSize_ - curPosition_)) nbyte = fileSize_ - curPosition_;
|
|
|
|
// amount left to read
|
|
uint16_t toRead = nbyte;
|
|
while (toRead > 0) {
|
|
uint32_t block; // raw device block number
|
|
uint16_t offset = curPosition_ & 0X1FF; // offset in block
|
|
if (type_ == FAT_FILE_TYPE_ROOT16) {
|
|
block = vol_->rootDirStart() + (curPosition_ >> 9);
|
|
} else {
|
|
uint8_t blockOfCluster = vol_->blockOfCluster(curPosition_);
|
|
if (offset == 0 && blockOfCluster == 0) {
|
|
// start of new cluster
|
|
if (curPosition_ == 0) {
|
|
// use first cluster in file
|
|
curCluster_ = firstCluster_;
|
|
} else {
|
|
// get next cluster from FAT
|
|
if (!vol_->fatGet(curCluster_, &curCluster_)) return -1;
|
|
}
|
|
}
|
|
block = vol_->clusterStartBlock(curCluster_) + blockOfCluster;
|
|
}
|
|
uint16_t n = toRead;
|
|
|
|
// amount to be read from current block
|
|
if (n > (512 - offset)) n = 512 - offset;
|
|
|
|
// no buffering needed if n == 512 or user requests no buffering
|
|
if ((unbufferedRead() || n == 512) &&
|
|
block != SdVolume::cacheBlockNumber_) {
|
|
if (!vol_->readData(block, offset, n, dst)) return -1;
|
|
dst += n;
|
|
} else {
|
|
// read block to cache and copy data to caller
|
|
if (!SdVolume::cacheRawBlock(block, SdVolume::CACHE_FOR_READ)) return -1;
|
|
uint8_t* src = SdVolume::cacheBuffer_.data + offset;
|
|
uint8_t* end = src + n;
|
|
while (src != end) *dst++ = *src++;
|
|
}
|
|
curPosition_ += n;
|
|
toRead -= n;
|
|
}
|
|
return nbyte;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Read the next directory entry from a directory file.
|
|
*
|
|
* \param[out] dir The dir_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 SdFile::readDir(dir_t* dir) {
|
|
int8_t n;
|
|
// if not a directory file or miss-positioned return an error
|
|
if (!isDir() || (0X1F & curPosition_)) return -1;
|
|
|
|
while ((n = read(dir, sizeof(dir_t))) == sizeof(dir_t)) {
|
|
// last entry if DIR_NAME_FREE
|
|
if (dir->name[0] == DIR_NAME_FREE) break;
|
|
// skip empty entries and entry for . and ..
|
|
if (dir->name[0] == DIR_NAME_DELETED || dir->name[0] == '.') continue;
|
|
// return if normal file or subdirectory
|
|
if (DIR_IS_FILE_OR_SUBDIR(dir)) return n;
|
|
}
|
|
// error, end of file, or past last entry
|
|
return n < 0 ? -1 : 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
// Read next directory entry into the cache
|
|
// Assumes file is correctly positioned
|
|
dir_t* SdFile::readDirCache(void) {
|
|
// error if not directory
|
|
if (!isDir()) return NULL;
|
|
|
|
// index of entry in cache
|
|
uint8_t i = (curPosition_ >> 5) & 0XF;
|
|
|
|
// use read to locate and cache block
|
|
if (read() < 0) return NULL;
|
|
|
|
// advance to next entry
|
|
curPosition_ += 31;
|
|
|
|
// return pointer to entry
|
|
return (SdVolume::cacheBuffer_.dir + i);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* 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 The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
* Reasons for failure include the file read-only, is a directory,
|
|
* or an I/O error occurred.
|
|
*/
|
|
uint8_t SdFile::remove(void) {
|
|
// free any clusters - will fail if read-only or directory
|
|
if (!truncate(0)) return false;
|
|
|
|
// cache directory entry
|
|
dir_t* d = cacheDirEntry(SdVolume::CACHE_FOR_WRITE);
|
|
if (!d) return false;
|
|
|
|
// mark entry deleted
|
|
d->name[0] = DIR_NAME_DELETED;
|
|
|
|
// set this SdFile closed
|
|
type_ = FAT_FILE_TYPE_CLOSED;
|
|
|
|
// write entry to SD
|
|
return SdVolume::cacheFlush();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Remove a file.
|
|
*
|
|
* The directory entry and all data for the file are deleted.
|
|
*
|
|
* \param[in] dirFile The directory that contains the file.
|
|
* \param[in] fileName The name of the file to be removed.
|
|
*
|
|
* \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 The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
* Reasons for failure include the file is a directory, is read only,
|
|
* \a dirFile is not a directory, \a fileName is not found
|
|
* or an I/O error occurred.
|
|
*/
|
|
uint8_t SdFile::remove(SdFile* dirFile, const char* fileName) {
|
|
SdFile file;
|
|
if (!file.open(dirFile, fileName, O_WRITE)) return false;
|
|
return file.remove();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/** 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 The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
* Reasons for failure include the file is not a directory, is the root
|
|
* directory, is not empty, or an I/O error occurred.
|
|
*/
|
|
uint8_t SdFile::rmDir(void) {
|
|
// must be open subdirectory
|
|
if (!isSubDir()) return false;
|
|
|
|
rewind();
|
|
|
|
// make sure directory is empty
|
|
while (curPosition_ < fileSize_) {
|
|
dir_t* p = readDirCache();
|
|
if (p == NULL) return false;
|
|
// done if past last used entry
|
|
if (p->name[0] == DIR_NAME_FREE) break;
|
|
// skip empty slot or '.' or '..'
|
|
if (p->name[0] == DIR_NAME_DELETED || p->name[0] == '.') continue;
|
|
// error not empty
|
|
if (DIR_IS_FILE_OR_SUBDIR(p)) return false;
|
|
}
|
|
// convert empty directory to normal file for remove
|
|
type_ = FAT_FILE_TYPE_NORMAL;
|
|
flags_ |= O_WRITE;
|
|
return remove();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/** 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 The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
*/
|
|
uint8_t SdFile::rmRfStar(void) {
|
|
rewind();
|
|
while (curPosition_ < fileSize_) {
|
|
SdFile f;
|
|
|
|
// remember position
|
|
uint16_t index = curPosition_/32;
|
|
|
|
dir_t* p = readDirCache();
|
|
if (!p) return false;
|
|
|
|
// done if past last entry
|
|
if (p->name[0] == DIR_NAME_FREE) break;
|
|
|
|
// skip empty slot or '.' or '..'
|
|
if (p->name[0] == DIR_NAME_DELETED || p->name[0] == '.') continue;
|
|
|
|
// skip if part of long file name or volume label in root
|
|
if (!DIR_IS_FILE_OR_SUBDIR(p)) continue;
|
|
|
|
if (!f.open(this, index, O_READ)) return false;
|
|
if (f.isSubDir()) {
|
|
// recursively delete
|
|
if (!f.rmRfStar()) return false;
|
|
} else {
|
|
// ignore read-only
|
|
f.flags_ |= O_WRITE;
|
|
if (!f.remove()) return false;
|
|
}
|
|
// position to next entry if required
|
|
if (curPosition_ != (32*(index + 1))) {
|
|
if (!seekSet(32*(index + 1))) return false;
|
|
}
|
|
}
|
|
// don't try to delete root
|
|
if (isRoot()) return true;
|
|
return rmDir();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Sets a file's position.
|
|
*
|
|
* \param[in] pos The new position in bytes from the beginning of the file.
|
|
*
|
|
* \return The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
*/
|
|
uint8_t SdFile::seekSet(uint32_t pos) {
|
|
// error if file not open or seek past end of file
|
|
if (!isOpen() || pos > fileSize_) return false;
|
|
|
|
if (type_ == FAT_FILE_TYPE_ROOT16) {
|
|
curPosition_ = pos;
|
|
return true;
|
|
}
|
|
if (pos == 0) {
|
|
// set position to start of file
|
|
curCluster_ = 0;
|
|
curPosition_ = 0;
|
|
return true;
|
|
}
|
|
// calculate cluster index for cur and new position
|
|
uint32_t nCur = (curPosition_ - 1) >> (vol_->clusterSizeShift_ + 9);
|
|
uint32_t nNew = (pos - 1) >> (vol_->clusterSizeShift_ + 9);
|
|
|
|
if (nNew < nCur || curPosition_ == 0) {
|
|
// must follow chain from first cluster
|
|
curCluster_ = firstCluster_;
|
|
} else {
|
|
// advance from curPosition
|
|
nNew -= nCur;
|
|
}
|
|
while (nNew--) {
|
|
if (!vol_->fatGet(curCluster_, &curCluster_)) return false;
|
|
}
|
|
curPosition_ = pos;
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* The sync() call causes all modified data and directory fields
|
|
* to be written to the storage device.
|
|
*
|
|
* \return The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
* Reasons for failure include a call to sync() before a file has been
|
|
* opened or an I/O error.
|
|
*/
|
|
uint8_t SdFile::sync(void) {
|
|
// only allow open files and directories
|
|
if (!isOpen()) return false;
|
|
|
|
if (flags_ & F_FILE_DIR_DIRTY) {
|
|
dir_t* d = cacheDirEntry(SdVolume::CACHE_FOR_WRITE);
|
|
if (!d) return false;
|
|
|
|
// do not set filesize for dir files
|
|
if (!isDir()) d->fileSize = fileSize_;
|
|
|
|
// update first cluster fields
|
|
d->firstClusterLow = firstCluster_ & 0XFFFF;
|
|
d->firstClusterHigh = firstCluster_ >> 16;
|
|
|
|
// set modify time if user supplied a callback date/time function
|
|
if (dateTime_) {
|
|
dateTime_(&d->lastWriteDate, &d->lastWriteTime);
|
|
d->lastAccessDate = d->lastWriteDate;
|
|
}
|
|
// clear directory dirty
|
|
flags_ &= ~F_FILE_DIR_DIRTY;
|
|
}
|
|
return SdVolume::cacheFlush();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* 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 - 2107 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 The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
*/
|
|
uint8_t SdFile::timestamp(uint8_t flags, uint16_t year, uint8_t month,
|
|
uint8_t day, uint8_t hour, uint8_t minute, uint8_t second) {
|
|
if (!isOpen()
|
|
|| year < 1980
|
|
|| year > 2107
|
|
|| month < 1
|
|
|| month > 12
|
|
|| day < 1
|
|
|| day > 31
|
|
|| hour > 23
|
|
|| minute > 59
|
|
|| second > 59) {
|
|
return false;
|
|
}
|
|
dir_t* d = cacheDirEntry(SdVolume::CACHE_FOR_WRITE);
|
|
if (!d) return false;
|
|
|
|
uint16_t dirDate = FAT_DATE(year, month, day);
|
|
uint16_t dirTime = FAT_TIME(hour, minute, second);
|
|
if (flags & T_ACCESS) {
|
|
d->lastAccessDate = dirDate;
|
|
}
|
|
if (flags & T_CREATE) {
|
|
d->creationDate = dirDate;
|
|
d->creationTime = dirTime;
|
|
// seems to be units of 1/100 second not 1/10 as Microsoft states
|
|
d->creationTimeTenths = second & 1 ? 100 : 0;
|
|
}
|
|
if (flags & T_WRITE) {
|
|
d->lastWriteDate = dirDate;
|
|
d->lastWriteTime = dirTime;
|
|
}
|
|
SdVolume::cacheSetDirty();
|
|
return sync();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Truncate a file to a specified length. 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.
|
|
*
|
|
* \param[in] length The desired length for the file.
|
|
*
|
|
* \return The value one, true, is returned for success and
|
|
* the value zero, false, is returned for failure.
|
|
* Reasons for failure include file is read only, file is a directory,
|
|
* \a length is greater than the current file size or an I/O error occurs.
|
|
*/
|
|
uint8_t SdFile::truncate(uint32_t length) {
|
|
// error if not a normal file or read-only
|
|
if (!isFile() || !(flags_ & O_WRITE)) return false;
|
|
|
|
// error if length is greater than current size
|
|
if (length > fileSize_) return false;
|
|
|
|
// fileSize and length are zero - nothing to do
|
|
if (fileSize_ == 0) return true;
|
|
|
|
// remember position for seek after truncation
|
|
uint32_t newPos = curPosition_ > length ? length : curPosition_;
|
|
|
|
// position to last cluster in truncated file
|
|
if (!seekSet(length)) return false;
|
|
|
|
if (length == 0) {
|
|
// free all clusters
|
|
if (!vol_->freeChain(firstCluster_)) return false;
|
|
firstCluster_ = 0;
|
|
} else {
|
|
uint32_t toFree;
|
|
if (!vol_->fatGet(curCluster_, &toFree)) return false;
|
|
|
|
if (!vol_->isEOC(toFree)) {
|
|
// free extra clusters
|
|
if (!vol_->freeChain(toFree)) return false;
|
|
|
|
// current cluster is end of chain
|
|
if (!vol_->fatPutEOC(curCluster_)) return false;
|
|
}
|
|
}
|
|
fileSize_ = length;
|
|
|
|
// need to update directory entry
|
|
flags_ |= F_FILE_DIR_DIRTY;
|
|
|
|
if (!sync()) return false;
|
|
|
|
// set file to correct position
|
|
return seekSet(newPos);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* 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] nbyte Number of bytes to write.
|
|
*
|
|
* \return For success write() returns the number of bytes written, always
|
|
* \a nbyte. If an error occurs, write() returns -1. Possible errors
|
|
* include write() is called before a file has been opened, write is called
|
|
* for a read-only file, device is full, a corrupt file system or an I/O error.
|
|
*
|
|
*/
|
|
size_t SdFile::write(const void* buf, uint16_t nbyte) {
|
|
// convert void* to uint8_t* - must be before goto statements
|
|
const uint8_t* src = reinterpret_cast<const uint8_t*>(buf);
|
|
|
|
// number of bytes left to write - must be before goto statements
|
|
uint16_t nToWrite = nbyte;
|
|
|
|
// error if not a normal file or is read-only
|
|
if (!isFile() || !(flags_ & O_WRITE)) goto writeErrorReturn;
|
|
|
|
// seek to end of file if append flag
|
|
if ((flags_ & O_APPEND) && curPosition_ != fileSize_) {
|
|
if (!seekEnd()) goto writeErrorReturn;
|
|
}
|
|
|
|
while (nToWrite > 0) {
|
|
uint8_t blockOfCluster = vol_->blockOfCluster(curPosition_);
|
|
uint16_t blockOffset = curPosition_ & 0X1FF;
|
|
if (blockOfCluster == 0 && blockOffset == 0) {
|
|
// start of new cluster
|
|
if (curCluster_ == 0) {
|
|
if (firstCluster_ == 0) {
|
|
// allocate first cluster of file
|
|
if (!addCluster()) goto writeErrorReturn;
|
|
} else {
|
|
curCluster_ = firstCluster_;
|
|
}
|
|
} else {
|
|
uint32_t next;
|
|
if (!vol_->fatGet(curCluster_, &next)) return false;
|
|
if (vol_->isEOC(next)) {
|
|
// add cluster if at end of chain
|
|
if (!addCluster()) goto writeErrorReturn;
|
|
} else {
|
|
curCluster_ = next;
|
|
}
|
|
}
|
|
}
|
|
// max space in block
|
|
uint16_t n = 512 - blockOffset;
|
|
|
|
// lesser of space and amount to write
|
|
if (n > nToWrite) n = nToWrite;
|
|
|
|
// block for data write
|
|
uint32_t block = vol_->clusterStartBlock(curCluster_) + blockOfCluster;
|
|
if (n == 512) {
|
|
// full block - don't need to use cache
|
|
// invalidate cache if block is in cache
|
|
if (SdVolume::cacheBlockNumber_ == block) {
|
|
SdVolume::cacheBlockNumber_ = 0XFFFFFFFF;
|
|
}
|
|
if (!vol_->writeBlock(block, src)) goto writeErrorReturn;
|
|
src += 512;
|
|
} else {
|
|
if (blockOffset == 0 && curPosition_ >= fileSize_) {
|
|
// start of new block don't need to read into cache
|
|
if (!SdVolume::cacheFlush()) goto writeErrorReturn;
|
|
SdVolume::cacheBlockNumber_ = block;
|
|
SdVolume::cacheSetDirty();
|
|
} else {
|
|
// rewrite part of block
|
|
if (!SdVolume::cacheRawBlock(block, SdVolume::CACHE_FOR_WRITE)) {
|
|
goto writeErrorReturn;
|
|
}
|
|
}
|
|
uint8_t* dst = SdVolume::cacheBuffer_.data + blockOffset;
|
|
uint8_t* end = dst + n;
|
|
while (dst != end) *dst++ = *src++;
|
|
}
|
|
nToWrite -= n;
|
|
curPosition_ += n;
|
|
}
|
|
if (curPosition_ > fileSize_) {
|
|
// update fileSize and insure sync will update dir entry
|
|
fileSize_ = curPosition_;
|
|
flags_ |= F_FILE_DIR_DIRTY;
|
|
} else if (dateTime_ && nbyte) {
|
|
// insure sync will update modified date and time
|
|
flags_ |= F_FILE_DIR_DIRTY;
|
|
}
|
|
|
|
if (flags_ & O_SYNC) {
|
|
if (!sync()) goto writeErrorReturn;
|
|
}
|
|
return nbyte;
|
|
|
|
writeErrorReturn:
|
|
// return for write error
|
|
//writeError = true;
|
|
setWriteError();
|
|
return 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Write a byte to a file. Required by the Arduino Print class.
|
|
*
|
|
* Use SdFile::writeError to check for errors.
|
|
*/
|
|
size_t SdFile::write(uint8_t b) {
|
|
return write(&b, 1);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Write a string to a file. Used by the Arduino Print class.
|
|
*
|
|
* Use SdFile::writeError to check for errors.
|
|
*/
|
|
size_t SdFile::write(const char* str) {
|
|
return write(str, strlen(str));
|
|
}
|
|
#ifdef __AVR__
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Write a PROGMEM string to a file.
|
|
*
|
|
* Use SdFile::writeError to check for errors.
|
|
*/
|
|
void SdFile::write_P(PGM_P str) {
|
|
for (uint8_t c; (c = pgm_read_byte(str)); str++) write(c);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/**
|
|
* Write a PROGMEM string followed by CR/LF to a file.
|
|
*
|
|
* Use SdFile::writeError to check for errors.
|
|
*/
|
|
void SdFile::writeln_P(PGM_P str) {
|
|
write_P(str);
|
|
println();
|
|
}
|
|
#endif
|