LZ4_saveDict(9)

💾 LZ4_saveDict(9) — the Kernel API Manual, but make it cute ✨

okay so bestie, this is LZ4_saveDict from the kernel API manual and it is literally the "move my stuff somewhere safe" function 🫶 it lives in the kernel, it deals with LZ4 compression streams, and it's way less scary than the manpage makes it look. let's go 💅

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🌸 SYNOPSIS 🌸

int LZ4_saveDict (LZ4_stream_t *streamPtr , char *safeBuffer , int
dictSize );

that's the whole signature, no cap ⭐

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🎀 ARGUMENTS 🎀

• streamPtr — pointer to the LZ4_stream_t structure. this is your stream, your main character 👑
• safeBuffer — the buffer you're saving the dictionary to. heads up: it must be already allocated by you, this function does not do your malloc-ing for you 🙈
• dictSize — the size of safeBuffer. i.e. how much room you're giving it 🍓

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🦋 DESCRIPTION 🦋

so here's the vibe check 💫 if the data block you compressed earlier is not guaranteed to remain available at its memory location (rude of it, honestly), you save it into a safer place — specifically a char *safeBuffer. that's it. that's the whole job. it's giving "moving your plants before the landlord visits" 🌱✨

lowkey important: this is about memory that might move or disappear on you. the function exists precisely because "it'll still be there, probably" is not a compression strategy 💀

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🧚 NOTE 🧚

pay attention bestie because this is the good part 🔥 you do not need to call LZ4_loadDict afterwards — the dictionary is immediately usable, so you can just go straight to calling LZ4_compress_fast_continue. no extra steps, no loading ritual, we love efficiency 💖

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🌈 RETURN 🌈

it returns the saved dictionary size in bytes (necessarily <= dictSize, always, it's not gonna overdo it 💅), or 0 if there was an error 😭

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⭐ SEE ALSO ⭐

go read these next, i promise they're not that deep, iykyk:

• kernel file: ./include/linux/lz4.h 📁
• LZ4_compressBound(9)
• 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_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)

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and that's the page, bestie 🫶 this one ships out of ./include/linux, dated October 2026, and the manual entry is LZ4_saveDict(9) — slay, go compress something safely 💜🎀