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comparison doc/TIFFS-Overview @ 920:0306449ba467
doc/TIFFS-Overview: document classic filename and pathname limits
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 31 Dec 2022 21:08:05 +0000 |
| parents | 23f41a61ff7a |
| children |
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| 919:1f27fc13eab7 | 920:0306449ba467 |
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| 235 All of the above are common and well-known principles, successfully implemented | 235 All of the above are common and well-known principles, successfully implemented |
| 236 in well-known flash file systems such as JFFS2 in Linux. TIFFS is absolutely | 236 in well-known flash file systems such as JFFS2 in Linux. TIFFS is absolutely |
| 237 no different in this regard; for the implementation details, read the source | 237 no different in this regard; for the implementation details, read the source |
| 238 code. | 238 code. |
| 239 | 239 |
| 240 TIFFS filename and pathname limits | |
| 241 ================================== | |
| 242 | |
| 243 Classic TIFFS, as in the canonical firmware source from TI, imposes the | |
| 244 following limits on the content written into FFS: | |
| 245 | |
| 246 * Each elementary filename or pathname component (the name of each individual | |
| 247 file or subdirectory within its parent directory) is limited to 20 characters; | |
| 248 | |
| 249 * The set of allowed characters in these elementary filenames is limited to | |
| 250 [A-Za-z0-9_.,+%$#-]; | |
| 251 | |
| 252 * The maximum pathname depth is limited to 6. | |
| 253 | |
| 254 As an illustration of the pathname depth limit, the deepest allowed path to a | |
| 255 non-directory file is /d1/d2/d3/d4/d5/file. It is also possible to have a | |
| 256 directory nesting of /d1/d2/d3/d4/d5/d6, but in this case the deepest directory | |
| 257 can only be empty. | |
| 258 | |
| 240 How this FFS comes into being | 259 How this FFS comes into being |
| 241 ============================= | 260 ============================= |
| 242 | 261 |
| 243 (This section is only relevant to you if you plan on physically producing your | 262 (This section is only relevant to you if you plan on physically producing your |
| 244 own GSM phones or modems on your own factory production line, like we currently | 263 own GSM phones or modems on your own factory production line, like we currently |