Adjust Rabin parameters for chunksize > LZMA window size.
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2 changed files with 4 additions and 3 deletions
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@ -96,12 +96,12 @@ create_rabin_context(uint64_t chunksize, uint64_t real_chunksize, const char *al
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int level = 14;
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int level = 14;
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/*
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/*
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* For LZMA we use 4K minimum Rabin block size. For everything else it
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* For LZMA with chunksize <= LZMA Window size we use 4K minimum Rabin
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* is 1K based on experimentation.
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* block size. For everything else it is 1K based on experimentation.
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*/
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*/
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ctx = (rabin_context_t *)slab_alloc(NULL, sizeof (rabin_context_t));
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ctx = (rabin_context_t *)slab_alloc(NULL, sizeof (rabin_context_t));
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ctx->rabin_poly_max_block_size = RAB_POLYNOMIAL_MAX_BLOCK_SIZE;
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ctx->rabin_poly_max_block_size = RAB_POLYNOMIAL_MAX_BLOCK_SIZE;
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if (memcmp(algo, "lzma", 4) == 0) {
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if (memcmp(algo, "lzma", 4) == 0 && chunksize <= LZMA_WINDOW_MAX) {
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ctx->rabin_poly_min_block_size = RAB_POLYNOMIAL_MIN_BLOCK_SIZE;
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ctx->rabin_poly_min_block_size = RAB_POLYNOMIAL_MIN_BLOCK_SIZE;
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ctx->rabin_avg_block_mask = RAB_POLYNOMIAL_AVG_BLOCK_MASK;
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ctx->rabin_avg_block_mask = RAB_POLYNOMIAL_AVG_BLOCK_MASK;
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ctx->rabin_poly_avg_block_size = RAB_POLYNOMIAL_AVG_BLOCK_SIZE;
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ctx->rabin_poly_avg_block_size = RAB_POLYNOMIAL_AVG_BLOCK_SIZE;
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@ -79,6 +79,7 @@
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#define RAB_POLYNOMIAL_AVG_BLOCK_MASK2 (RAB_POLYNOMIAL_AVG_BLOCK_SIZE - 1)
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#define RAB_POLYNOMIAL_AVG_BLOCK_MASK2 (RAB_POLYNOMIAL_AVG_BLOCK_SIZE - 1)
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#define RAB_POLYNOMIAL_MIN_BLOCK_SIZE2 2048
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#define RAB_POLYNOMIAL_MIN_BLOCK_SIZE2 2048
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#define LZMA_WINDOW_MAX (128L * 1024L * 1024L)
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#define RAB_POLYNOMIAL_WIN_SIZE 31
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#define RAB_POLYNOMIAL_WIN_SIZE 31
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#define RAB_POLYNOMIAL_MIN_WIN_SIZE 17
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#define RAB_POLYNOMIAL_MIN_WIN_SIZE 17
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#define RAB_POLYNOMIAL_MAX_WIN_SIZE 63
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#define RAB_POLYNOMIAL_MAX_WIN_SIZE 63
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