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README

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-SPIFFS (SPI Flash File System)
-V0.3.3
-
-Copyright (c) 2013-2015 Peter Andersson (pelleplutt1976<at>gmail.com)
-
-For legal stuff, see LICENCE in this directory. Basically, you may do whatever
-you want with the source. Use, modify, sell, print it out, roll it and smoke it
- - as long as I won't be held responsible.
-
-Love to hear feedback though!
-
-
-* INTRODUCTION
-
-Spiffs is a file system intended for SPI NOR flash devices on embedded targets.
-
-Spiffs is designed with following characteristics in mind:
- - Small (embedded) targets, sparse RAM without heap
- - Only big areas of data (blocks) can be erased
- - An erase will reset all bits in block to ones
- - Writing pulls one to zeroes
- - Zeroes can only be pulled to ones by erase
- - Wear leveling
-
-
-* FEATURES
-
-What spiffs does:
- - Specifically designed for low ram usage
- - Uses statically sized ram buffers, independent of number of files
- - Posix-like api: open, close, read, write, seek, stat, etc
- - It can be run on any NOR flash, not only SPI flash - theoretically also on
-   embedded flash of an microprocessor
- - Multiple spiffs configurations can be run on same target - and even on same
-   SPI flash device
- - Implements static wear leveling 
- - Built in file system consistency checks
- 
-What spiffs does not:
- - Presently, spiffs does not support directories. It produces a flat
-   structure. Creating a file with path "tmp/myfile.txt" will create a file 
-   called "tmp/myfile.txt" instead of a "myfile.txt" under directory "tmp". 
- - It is not a realtime stack. One write operation might take much longer than
-   another.
- - Poor scalability. Spiffs is intended for small memory devices - the normal
-   sizes for SPI flashes. Going beyond ~128MB is probably a bad idea. This is
-   a side effect of the design goal to use as little ram as possible.
- - Presently, it does not detect or handle bad blocks.
-
- 
-* MORE INFO 
- 
-For integration, see the docs/INTEGRATION file.
-
-For use and design, see the docs/TECH_SPEC file.
-
-For testing and contributions, see the docs/IMPLEMENTING file.
-
-* HISTORY
-
-0.3.3 - Might not be compatible with 0.3.2 structures. See issue #40
-  Possibility to add integer offset to file handles
-  Truncate function presumes too few free pages #49
-  Bug in truncate function #48 (thanks @PawelDefee)
-  Update spiffs_gc.c - remove unnecessary parameter (thanks @PawelDefee)
-  Update INTEGRATION docs (thanks @PawelDefee)
-  Fix pointer truncation in 64-bit platforms (thanks @igrr)
-  Zero-sized files cannot be read #44 (thanks @rojer)
-  (More) correct calculation of max_id in obj_lu_find #42 #41 (thanks @lishen2)
-  Check correct error code in obj_lu_find_free #41 (thanks @lishen2)
-  Moar comments for SPIFFS_lseek (thanks @igrr)
-  Fixed padding in spiffs_page_object_ix #40 (thanks @jmattsson @lishen2)
-  Fixed gc_quick test (thanks @jmattsson)
-  Add SPIFFS_EXCL flag #36 
-  SPIFFS_close may fail silently if cache is enabled #37 
-  User data in callbacks #34
-  Ignoring SINGLETON build in cache setup (thanks Luca)
-  Compilation error fixed #32 (thanks @chotasanjiv)
-  Align cand_scores (thanks @hefloryd)
-  Fix build warnings when SPIFFS_CACHE is 0 (thanks @ajaybhargav)
-
-  New config defines:
-    SPIFFS_FILEHDL_OFFSET
-
-0.3.2
-  Limit cache size if too much cache is given (thanks pgeiem)
-  New feature - Controlled erase. #23
-  SPIFFS_rename leaks file descriptors #28 (thanks benpicco)
-  moved dbg print defines in test framework to params_test.h
-  lseek should return the resulting offset (thanks hefloryd)
-  fixed type on dbg ifdefs
-  silence warning about signed/unsigned comparison when spiffs_obj_id is 32 bit (thanks benpicco)
-  Possible error in test_spiffs.c #21 (thanks yihcdaso-yeskela)
-  Cache might writethrough too often #16
-  even moar testrunner updates
-  Test framework update and some added tests
-  Some thoughts for next gen
-  Test sigsevs when having too many sectors #13  (thanks alonewolfx2)
-  GC might be suboptimal #11
-  Fix eternal readdir when objheader at last block, last entry
-  
-  New API functions:
-    SPIFFS_gc_quick - call a nonintrusive gc
-    SPIFFS_gc - call a full-scale intrusive gc
-
-0.3.1
-  Removed two return warnings, was too triggerhappy on release
-
-0.3.0
-  Added existing namecheck when creating files
-  Lots of static analysis bugs #6
-  Added rename func
-  Fix SPIFFS_read length when reading beyond file size
-  Added reading beyond file length testcase
-  Made build a bit more configurable
-  Changed name in spiffs from "errno" to "err_code" due to conflicts compiling
-    in mingw
-  Improved GC checks, fixed an append bug, more robust truncate for very special
-    case
-  GC checks preempts GC, truncate even less picky
-  Struct alignment needed for some targets, define in spiffs config #10
-  Spiffs filesystem magic, definable in config
-
-  New config defines:
-    SPIFFS_USE_MAGIC - enable or disable magic check upon mount
-    SPIFFS_ALIGNED_OBJECT_INDEX_TABLES - alignment for certain targets
-  New API functions:
-    SPIFFS_rename - rename files
-    SPIFFS_clearerr - clears last errno
-    SPIFFS_info - returns info on used and total bytes in fs
-    SPIFFS_format - formats the filesystem
-    SPIFFS_mounted - checks if filesystem is mounted
-
-