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#define NEXT() ((strm->avail_in == 0 && xz_avail(state) == -1) ? -1 : \
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(strm->avail_in == 0 ? -1 : \
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(strm->avail_in--, *(strm->next_in)++)))
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/* Get a four-byte little-endian integer and return 0 on success and the value
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in *ret. Otherwise -1 is returned and *ret is not modified. */