zstd_decompress_stream(9)

💖 NAME 💖

okay bestie, this is the zstd_decompress_stream(9) page from the Kernel API Manual, and she's here to streaming decompress some of input into output. No cap, that's literally the whole gig: zstd_decompress_stream streams decompressed output out of your input. Iconic behavior. 💅

✨ SYNOPSIS ✨

size_t zstd_decompress_stream (zstd_dstream *dstream , zstd_out_buffer
*output , zstd_in_buffer *input );

🫶 ARGUMENTS 🫶

• dstream — the zstd streaming decompression context. That's your girl's state.
• output — destination buffer. output.pos is updated to indicate how much decompressed data was written. slay.
• input — source buffer. input.pos is updated to indicate how much data was read. Note that it may not consume the entire input, in which case input.pos < input.size, and it's up to the caller to present remaining data again.

🌸 DESCRIPTION 🌸

okay so the input and output buffers may be any size — literally any size, bestie. Guaranteed to make some forward progress if input and output are not empty. That's the vibe check. ✨

zstd_decompress_stream will not consume the last byte of the frame until the entire frame is flushed. That's the caveat you cannot skip, iykyk. 🫶

🔥 RETURN 🔥

Returns 0 iff a frame is completely decoded and fully flushed. Otherwise returns a hint for the number of bytes to use as the input for the next function call or an error, which can be checked using zstd_is_error. The size hint will never load more than the frame, fr fr.

🌈 SEE ALSO 🌈

• Kernel file ./include/linux/zstd.h
• 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_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_find_frame_compressed_size(9)
• zstd_get_frame_header(9)
• zstd_compress_sequences_and_literals(9)

kisses and sparkles, your kernel bestie 💖 — source/version: ./include/linux; date: October 2026; manual page: zstd_decompress_stream(9). periodt. 🎀