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Recycle zstd decompression context if possible, avoiding repeated allocations.

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This commit is contained in:
Lukas Tenbrink
2025-03-15 15:39:18 +01:00
parent b377562b52
commit b4f6663afa
1 changed files with 21 additions and 5 deletions
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26
core/io/compression.cpp
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@@ -42,6 +42,12 @@
#include <brotli/decode.h>
#endif
// Caches for zstd.
static BinaryMutex mutex;
static ZSTD_DCtx *current_zstd_d_ctx = nullptr;
static bool current_zstd_long_distance_matching;
static int current_zstd_window_log_size;
int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size, Mode p_mode) {
switch (p_mode) {
case MODE_BROTLI: {
@@ -187,12 +193,22 @@ int Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p
return total;
} break;
case MODE_ZSTD: {
ZSTD_DCtx *dctx = ZSTD_createDCtx();
if (zstd_long_distance_matching) {
ZSTD_DCtx_setParameter(dctx, ZSTD_d_windowLogMax, zstd_window_log_size);
MutexLock lock(mutex);
if (!current_zstd_d_ctx || current_zstd_long_distance_matching != zstd_long_distance_matching || current_zstd_window_log_size != zstd_window_log_size) {
if (current_zstd_d_ctx) {
ZSTD_freeDCtx(current_zstd_d_ctx);
}
current_zstd_d_ctx = ZSTD_createDCtx();
if (zstd_long_distance_matching) {
ZSTD_DCtx_setParameter(current_zstd_d_ctx, ZSTD_d_windowLogMax, zstd_window_log_size);
}
current_zstd_long_distance_matching = zstd_long_distance_matching;
current_zstd_window_log_size = zstd_window_log_size;
}
int ret = ZSTD_decompressDCtx(dctx, p_dst, p_dst_max_size, p_src, p_src_size);
ZSTD_freeDCtx(dctx);
int ret = ZSTD_decompressDCtx(current_zstd_d_ctx, p_dst, p_dst_max_size, p_src, p_src_size);
return ret;
} break;
}