LZ4_compressBound(9)

💅 LZ4_compressBound 💅

okay bestie, so this page is from the Kernel API Manual, and the star of the show is LZ4_compressBound — she's that girl who tells you how much room to book before the party even starts 🎀

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✨ NAME ✨

LZ4_compressBound — max output size in worst case scenarios 🔥

like, how big can the output possibly get when everything goes wrong? she knows. no cap.

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🦋 SYNOPSIS 🦋

int LZ4_compressBound (size_t isize );

that's it. one argument. she's lowkey minimal and we stan 💅

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🌸 ARGUMENTS 🌸

• isize — the size of the input data, aka how much stuff you're trying to squeeze in there 🍓

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👑 RETURN 👑

she hands you back the max size that LZ4 may output in a "worst case" scenario — and yes, that means data not compressible 😭 so nothing shrinks, nothing slays, everything is literally just itself and you still need the full buffer.

bestie pls: this is the worst case, not the typical case. allocate for the worst case and your future self will thank you 🫶

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🌈 SEE ALSO 🌈

the whole lz4 friend group, plus the header they all live in: the Kernel file ./include/linux/lz4.h 💖

• LZ4_compress_default(9)
• LZ4_compress_fast(9)
• LZ4_compress_destSize(9)
• LZ4_decompress_fast(9)
• LZ4_decompress_safe(9)
• LZ4_decompress_safe_partial(9)
• LZ4_compress_HC(9)
• LZ4_resetStreamHC(9)
• LZ4_loadDictHC(9)
• LZ4_compress_HC_continue(9)
• LZ4_saveDictHC(9)
• LZ4_resetStream(9)
• LZ4_loadDict(9)
• LZ4_saveDict(9)
• LZ4_compress_fast_continue(9)
• LZ4_setStreamDecode(9)
• LZ4_decompress_safe_continue(9)
• LZ4_decompress_fast_continue(9)
• LZ4_decompress_safe_usingDict(9)
• LZ4_decompress_fast_usingDict(9)

twenty of them. she has a big family. it's giving main character energy 👑

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mwah 💋 that's the whole page — brought to you from ./include/linux, dated October 2026, and officially filed under LZ4_compressBound(9). go forth and size your buffers correctly, icon ✨