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py/objint: Fix int.to_bytes() buffer size checks.#13087
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Codecov ReportAll modified and coverable lines are covered by tests ✅
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## master #13087 +/- ##
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Coverage 98.42% 98.42%
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Files 161 161
Lines 21234 21248 +14
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+ Hits 20900 20914 +14
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projectgus
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May 1, 2024
| int slen = MP_INT_REPR_LEN(val, val < 0); | ||
| memset(data, val < 0 ? 0xFF : 0x00, dlen); | ||
| if (slen <= dlen) { | ||
| mp_binary_set_int(slen, big_endian, data + (big_endian ? (dlen - slen) : 0), val); |
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For later consideration (not this PR): can mp_binary_set_val and this function be combined to save size?
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I don't really like this approach but it seems the least bad that works across all configurations and isn't too intrusive.
The other way I thought to do it was to only define mp_clz32() and mp_clz64() and then have each port define MP_SIZEOF_INT or a similar macro.
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@dpgeorge Finally found a combination that works across all ports, I think! |
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Signed-off-by: Angus Gratton <angus@redyak.com.au>
Fixes and improvements to `int.to_bytes()` are: - No longer overflows if byte size is 0 (closes micropython#13041). - Raises OverflowError in any case where number won't fit into byte length (now matches CPython, previously MicroPython would return a truncated bytes object). - Document that `micropython int.to_bytes()` doesn't implement the optional signed kwarg, but will behave as if `signed=True` when the integer is negative (this is the current behaviour). Add tests for this also. Requires changes for small ints, MPZ large ints, and "long long" large ints. Adds a new set of unit tests for ints between 32 and 64 bits to increase coverage of "long long" large ints, which are otherwise untested. Tested on unix port (64 bit small ints, MPZ long ints) and Zephyr STM32WB board (32 bit small ints, long long large ints). This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>
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This "little fix" ended up growing and growing, so this might be too much code size impact. In which case this should be closed. There's a much smaller patch which only fixes the first point from the list below.
int.to_bytes()doesn't implement the optionalsignedkwarg, but will behave as ifsigned=Truewhen the integer is negative (this is the current behaviour). Add tests for this also.Changes are implemented for small ints, MPZ large ints, and "long long" large ints.
Adds a new set of unit tests for ints between 32 and 64 bits to increase coverage of "long long" large ints, which are otherwise untested.
Tested on unix port (64 bit small ints, MPZ long ints) and Zephyr STM32WB board (32 bit small ints, long long large ints).
Untested on a port whose native format is big endian (don't have one at hand).
This work was funded through GitHub Sponsors.