fs/cromfs: Fix stale cache read in read() fast path. cromfs_read()'s fast path decompresses a block directly into the caller's buffer whenever a read reaches a block at its start and the caller has room for the whole decompressed block, bypassing the per-file decompression cache (ff_buffer). It nonetheless marked that block as cached by setting ff_offset, without ever writing ff_buffer itself. A later read of the same block that fell onto the slow path trusted that false cache tag, skipped decompression, and copied from ff_buffer without it ever having been populated for that block. A repeated identical fast-path read of the same block hit the same false tag and skipped decompression entirely, leaving the caller's buffer untouched and returning whatever was already there. Fixed by having the fast path only read the cache, never populate it: reuse ff_buffer when a prior slow-path read already cached the same block, otherwise decompress straight into the caller's buffer without touching ff_offset/ff_buffer. Co-authored-by: Pavlo Assisted-by: Claude Code:claude-sonnet-5 Signed-off-by: alexcekay <alexander@auterion.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.