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Fuzzes CPython's I/O C implementations under Modules/_io/. Dispatches per input across seven targets: BytesIO (write/seek/read/readline, readinto a pre-allocated buffer, getbuffer, truncate at a fuzzed position, getvalue); TextIOWrapper over a BytesIO with a fuzzed encoding (utf-8, latin-1, ascii, utf-16) and newline mode (None, "", \n, \r, \r\n) to drive decoding and newline translation, then detach; BufferedReader / BufferedWriter / BufferedRandom over a raw BytesIO to exercise the buffering layer; FileIO against a real temp file in read or write mode to hit the fd-backed path; io.open() for the mode-dispatched high-level wrapper; IncrementalNewlineDecoder driven through decode/getstate/reset with the translate flag toggled; and StringIO for the in-memory text stream.
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Fuzzes CPython's I/O C implementations under
Modules/_io/. Dispatches per input across seven targets: BytesIO (write/seek/read/readline,readintoa pre-allocated buffer, getbuffer, truncate at a fuzzed position, getvalue);TextIOWrapperover a BytesIO with a fuzzed encoding (utf-8,latin-1,ascii,utf-16) and newline mode (None,"",\n,\r,\r\n) to drive decoding and newline translation, then detach;BufferedReader/BufferedWriter/BufferedRandomover a raw BytesIO to exercise the buffering layer; FileIO against a real temp file in read or write mode to hit the fd-backed path;io.open()for the mode-dispatched high-level wrapper;IncrementalNewlineDecoderdriven through decode/getstate/reset with the translate flag toggled; and StringIO for the in-memory text stream.