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refactor(decompress): move default window policy to Rust

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Route the configured default maximum window size through the Rust policy layer while keeping the build-time C configuration value and decoder layout in C. The explicit projection preserves overridden builds exactly and gives the scalar policy a focused null-input contract and tests.

Test Plan:

- git diff --check -- lib/decompress/zstd_decompress.c rust/src/zstd_decompress.rs

- capped serial cargo check, clippy, nightly fmt, C syntax checks, and focused default-window tests (passed in the worker)
This commit is contained in:
ddidderr
2026-07-21 09:47:29 +02:00
parent 2eb56f3434
commit 9c7bf99a61
2 changed files with 79 additions and 3 deletions
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lib/decompress/zstd_decompress.c
+16 -3
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@@ -18,8 +18,8 @@
#include "zstd_ddict.h"
/* Keep the three public build-time tuning knobs in the C configuration domain.
* Rust queries them through the small leaves below rather than baking a second
* set of defaults into its source. */
* Rust receives them through the small scalar-policy leaves below rather than
* baking a second set of defaults into its source. */
#ifndef ZSTD_HEAPMODE
# define ZSTD_HEAPMODE 1
#endif
@@ -187,6 +187,16 @@ typedef char ZSTD_rust_decompress_stack_callbacks_layout[
size_t ZSTD_rust_decompress_stack_action(
const ZSTD_rustDecompressStackProjection* projection,
const ZSTD_rustDecompressStackCallbacks* callbacks);
typedef struct {
size_t configured_max_window_size;
} ZSTD_rustDefaultMaxWindowProjection;
typedef char ZSTD_rust_default_max_window_projection_layout[
(offsetof(ZSTD_rustDefaultMaxWindowProjection,
configured_max_window_size) == 0
&& sizeof(ZSTD_rustDefaultMaxWindowProjection) == sizeof(size_t))
? 1 : -1];
size_t ZSTD_rust_default_max_window_policy(
const ZSTD_rustDefaultMaxWindowProjection* projection);
typedef struct {
int configured_max;
} ZSTD_rustNoForwardProgressProjection;
@@ -328,7 +338,10 @@ void ZSTD_dctx_init_platform(ZSTD_DCtx* dctx)
size_t ZSTD_rust_dctx_default_max_window_size(void)
{
return ZSTD_MAXWINDOWSIZE_DEFAULT;
ZSTD_rustDefaultMaxWindowProjection const projection = {
ZSTD_MAXWINDOWSIZE_DEFAULT
};
return ZSTD_rust_default_max_window_policy(&projection);
}
int ZSTD_rust_no_forward_progress_max(void)