zstd_compress_using_cdict(9)

💅 zstd_compress_using_cdict — the Kernel API Manual moment

okay so bestie, welcome to the zstd_compress_using_cdict(9) page, straight out of the kernel API manual ✨ this is the one where you take ur data and squish it into a smaller buffer with a dictionary, and honestly? iconic behavior.

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🌸 NAME 🌸

zstd_compress_using_cdict — compress src into dst using a dictionary 💖

like, that's it. that's the whole vibe. dictionary-powered compression, no cap.

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🎀 SYNOPSIS 🎀

size_t zstd_compress_using_cdict (zstd_cctx *cctx , void *dst , size_t
dst_capacity , const void *src , size_t src_size , const zstd_cdict
*cdict );

she's got six parameters and she's not sorry about it 🫶

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✨ ARGUMENTS ✨

• cctx — the context, bestie. it must have been initialized with zstd_init_cctx. no init, no compression, fr fr 💀
• dst — the buffer you're squeezing src into. destination era 🌈
• dst_capacity — how big the destination buffer is. it may be any size, but ZSTD_compressBound(srcSize) is guaranteed to be large enough. so like, you can wing it, but if you want to be safe-safe, use that 👑
• src — the actual data you wanna compress. the main character of this whole operation 💜
• src_size — the size of the data you're compressing. gotta know how much you're working with 🎀
• cdict — the dictionary being used. the whole reason this function has using_cdict in the name, iykyk 🦋

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🔥 RETURN 🔥

the compressed size, or an error 😭 and you can check whether it's an error with zstd_is_error. always do the vibe check, bestie — don't just assume it slayed.

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⭐ SEE ALSO ⭐

kernel file ./include/linux/zstd.h and like, the whole zstd friend group 💅:

• zstd_compress_bound(9)
• zstd_is_error(9)
• zstd_get_error_code(9)
• zstd_get_error_name(9)
• zstd_min_clevel(9)
• zstd_max_clevel(9)
• zstd_default_clevel(9)
• zstd_get_params(9)
• zstd_get_cparams(9)
• zstd_cctx_set_param(9)
• zstd_cctx_workspace_bound(9)
• zstd_cctx_workspace_bound_with_ext_seq_prod(9)
• zstd_init_cctx(9)
• zstd_compress_cctx(9)
• zstd_create_cctx_advanced(9)
• zstd_free_cctx(9)
• zstd_create_cdict_byreference(9)
• zstd_free_cdict(9)
• zstd_dctx_workspace_bound(9)
• zstd_init_dctx(9)
• zstd_decompress_dctx(9)
• zstd_create_ddict_byreference(9)
• zstd_free_ddict(9)
• zstd_create_dctx_advanced(9)
• zstd_free_dctx(9)
• zstd_decompress_using_ddict(9)
• zstd_cstream_workspace_bound(9)
• zstd_cstream_workspace_bound_with_ext_seq_prod(9)
• zstd_init_cstream(9)
• zstd_reset_cstream(9)
• zstd_compress_stream(9)
• zstd_flush_stream(9)
• zstd_end_stream(9)
• zstd_dstream_workspace_bound(9)
• zstd_init_dstream(9)
• zstd_reset_dstream(9)
• zstd_decompress_stream(9)
• zstd_find_frame_compressed_size(9)
• zstd_get_frame_header(9)
• zstd_compress_sequences_and_literals(9)

go read them. all of them. she said what she said 📚✨

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and that's the page, bestie 🧚 this little number lives in ./include/linux and it's dated October 2026, and yes we're still out here citing zstd_compress_using_cdict(9) like the queen she is. mwah 💋🍓