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ringbuffer.size must be at least 2, and is a 16-bit quantity.
This fixes several cases including the one the fuzzer discovered, which
would lead to a fatal signal when accessing the object.
Fixes issue #17847.
Signed-off-by: Jeff Epler <jepler@gmail.com>
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Signed-off-by: Damien George <damien@micropython.org>
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This commit adds a new `RingIO` type which exposes the internal ring-buffer
code for general use in Python programs. It has the stream interface
making it similar to `StringIO` and `BytesIO`, except `RingIO` has a fixed
buffer size and is automatically safe when reads and writes are in
different threads or an IRQ.
This new type is enabled at the "extra features" ROM level.
Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
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