zstd_reset_cstream(9)

💅 zstd_reset_cstream — the glow-up your compression context deserves ✨

Okay bestie, so this is a page from the Kernel API Manual (yes, the kernel, we're fancy now), and it's all about zstd_reset_cstream(9). Buckle up, because this little function is literally the reset button for your zstd streaming compression era. 🎀

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✨ SYNOPSIS ✨

size_t zstd_reset_cstream(zstd_cstream *cstream, unsigned long long pledged_src_size);

Like, that's the whole vibe. Two arguments, one size_t return, no cap. 🦋

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🌸 ARGUMENTS 🌸

• cstream — the zstd streaming compression context you're about to reset. It's the main character here, okay? Give it a little reset moment. 💅
• pledged_src_size — optionally the source size, or just pass zero if you literally have no idea. It's giving "I'll figure it out later" energy. 🙈

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💖 DESCRIPTION 💖

So here's the tea: this function resets the context using the parameters from creation. It skips dictionary loading because the dictionary can just be reused — no need to redo all that work, bestie. Efficiency ate. 🔥

And if pledged_src_size is non-zero? Then the frame content size is always written into the frame header. Like, it's not optional at that point, it's happening, periodt. 💀

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⭐ RETURN ⭐

It returns zero on success, or an error. You can check for errors using zstd_is_error. So if something goes wrong, don't panic — just vibe check it with that function. 🫶

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🌈 SEE ALSO 🌈

Okay so there are so many related functions, and honestly they're all iconic in their own way. Go read these when you're done here, iykyk:

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_compress_using_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_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).

Also, the kernel file ./include/linux/zstd.h is where the magic lives. Go look at it, it's lowkey fascinating. 👑

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Big slay to the Kernel API Manual for hosting this page, and shoutout to the ./include/linux directory. This edition is from October 2026 — mark your calendars, bestie. 💜