Port to Java - #873
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…diskWrite) - FatFs.read/write now take ByteBuffer and copy at absolute offsets without touching position/limit; byte[] overloads kept for backward compat via ByteBuffer.wrap - DiskIo adds default ByteBuffer overloads that delegate to byte[] impl via hasArray-aware copy, preserving position/limit - No changes to java/ or javatests/ (top-level) and no changes to third_party/javatests/
…ileSystemImpl uses FatFs) - Bytes.bytesFromByteBuffer now uses duplicate to avoid advancing position - FatFileSystemImpl migrated from de.waldheinz to org.elm_chan.ff.FatFs with DiskIo adapter preserving ByteBuffer position/limit - BUILD.bazel depends on //third_party/java/org/elm_chan/ff - FileSystemImpl and test expectations updated for new mkfs layout (OEM MSDOS5.0, NO NAME, correct sector locations)
- FatFs.getLabel(String path, String[] label, long[] vsn) mirrors ff.c f_getlabel (mount_volume, dir_sdi, dir_read(DIR_READ_LABEL), 11-byte AM_VOL extraction with trailing-space truncation, move_window(volbase) + ld_32 for VSN; exFAT branch pruned with comment, matching baked-in FF_FS_EXFAT=0) - FatFileSystemImpl.getTime() now uses LocalDateTime.now() (year-1980, mon, day, hour, min, sec/2 packed as FAT date/time) instead of fixed 2025-01-01 - Fix broken getFilesystemMetadata (was checkResult(lseek( ... ) syntax error) to correctly call getfree and build TOTAL_BLOCKS/USED_BLOCKS/BLOCK_SIZE)
- FatFs.setLabel(String label) mirrors ff.c f_setlabel (mount_volume with drive prefix via get_ldnumber, dirvn[11] creation with DBCS handling via dbc_1st/dbc_2nd, IsLower uppercasing, badchr check for FAT, DDEM check, trailing-space snip, Dir dj open root, dir_sdi + dir_read(DIR_READ_LABEL) to find existing AM_VOL entry, update via memcpy or DDEM removal, or dir_alloc + AM_VOL creation + sync_fs; exFAT branch pruned) - FatFileSystemImpl.create now calls setLabel(volumeName) after mkfs to persist volume label (was previously ignored, causing getFilesystemMetadata to return empty volume_name) - Fix getFilesystemMetadata to include volume_name via getLabel
- putFilesystemMetadata with valid label, replacement, empty removal - Invalid keys (empty, wrong key, mixed) throws IllegalArgumentException - Persists after flush (new FatFileSystemImpl sees updated label) - Invalid label with bad char throws InvalidPathException - Fix create() to call setLabel(volumeName) after mkfs so getFilesystemMetadata correctly reflects volume_name used at creation
dependent (Windows uses \ as a directory separator...). So implement our own simple version and use that instead.
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