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docs(rust): refresh decoder migration boundary

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The component map still described decoder context allocation as a C-owned
responsibility after the allocation and custom-memory bridges moved into Rust.
Update the boundary description to distinguish the C-defined context layout and
configuration-sensitive platform, legacy, and trace leaves from Rust-owned
storage allocation and allocator dispatch.

Test Plan:
- `git diff --cached --check` -- passed
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ddidderr
2026-07-18 20:20:11 +02:00
parent 1422d64300
commit a8cb43c5e7
1 changed files with 3 additions and 1 deletions
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rust/README.md
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@@ -76,7 +76,9 @@ zstd ABI:
FSE/Huffman repeat state, and executes compressed-block sequences. FSE/Huffman repeat state, and executes compressed-block sequences.
- `zstd_decompress` owns the public decompression context, one-shot, - `zstd_decompress` owns the public decompression context, one-shot,
dictionary, parameter, and streaming state machines. Its C shim retains dictionary, parameter, and streaming state machines. Its C shim retains
configuration-dependent context allocation plus legacy and trace leaves. the configuration-dependent context layout and platform details, plus
legacy and trace leaves; Rust owns decoder storage allocation and custom
memory dispatch.
- Command-line frontend - Command-line frontend
- `zstd_cli` owns the Rust parser, safety policy, and dispatch. It is built - `zstd_cli` owns the Rust parser, safety policy, and dispatch. It is built
by the separate `cli/` static-library package only for program archives, by the separate `cli/` static-library package only for program archives,