xz_dec_microlzma_alloc(9)

💅 xz_dec_microlzma_alloc — kernel API manual, bestie edition ✨

okay so real talk, this one is from the Kernel API Manual and it's literally called xz_dec_microlzma_alloc and it's about getting memory ready for the MicroLZMA decoder 🎀

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✨ NAME ✨

xz_dec_microlzma_alloc — bestie, it allocates memory for the MicroLZMA decoder 💖

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🦋 SYNOPSIS 🦋

struct xz_dec_microlzma * xz_dec_microlzma_alloc (enum xz_mode mode ,
uint32_t dict_size );

like yeah, that's the whole vibe ✨

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🌸 ARGUMENTS 🌸

• mode — it's giving XZ_SINGLE or XZ_PREALLOC, pick one bestie 💅
• dict_size — the LZMA dictionary size. ngl this one has rules: it must be at least 4 KiB and at most 3 GiB. no cap. go outside that range and it's not gonna work 😭

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💜 DESCRIPTION 💜

so here's the tea: in contrast to xz_dec_init, this function only allocates the memory and remembers the dictionary size. that's it, that's the whole job 🫶

🚨 important bestie!! xz_dec_microlzma_reset must be used before calling xz_dec_microlzma_run. like, do not skip this step, it's not optional, periodt 💀

now the memory math, because yes we're doing math:

• with XZ_SINGLE, the amount of allocated memory is a little less than 30 KiB ✨
• with XZ_PREALLOC, you also get a dictionary buffer of dict_size bytes allocated 👑

on success, xz_dec_microlzma_alloc returns a pointer to struct xz_dec_microlzma 🎀

but if memory allocation fails, or dict_size is invalid? NULL is returned. that's the fail state, no cap 🙈

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/xz.h
• enum xz_mode(9)
• enum xz_ret(9)
• struct xz_buf(9)
• xz_dec_init(9)
• xz_dec_run(9)
• xz_dec_reset(9)
• xz_dec_end(9)
• MicroLZMA decompressor(9)
• xz_dec_microlzma_reset(9)
• xz_dec_microlzma_run(9)
• xz_dec_microlzma_end(9)

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and that's the page bestie!! 💖 this little icon lives in ./include/linux, dated October 2026, and it's page xz_dec_microlzma_alloc(9) — go forth and decode 🌈🦋⭐