X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=lzma%2Flz%2Flz_encoder_hash.h;fp=lzma%2Flz%2Flz_encoder_hash.h;h=342a333d16823a7ca4bb9007b5d397a6d5aad773;hb=32b8a6b26ed8843828e03e505d2256960bda0980;hp=0000000000000000000000000000000000000000;hpb=d48fc23a4bcf8ca3c406d6e8c8a6f8c6b0fa2f1e;p=zpackage

diff --git a/lzma/lz/lz_encoder_hash.h b/lzma/lz/lz_encoder_hash.h
new file mode 100644
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+++ b/lzma/lz/lz_encoder_hash.h
@@ -0,0 +1,108 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       lz_encoder_hash.h
+/// \brief      Hash macros for match finders
+//
+//  Author:     Igor Pavlov
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_LZ_ENCODER_HASH_H
+#define LZMA_LZ_ENCODER_HASH_H
+
+#if defined(WORDS_BIGENDIAN) && !defined(HAVE_SMALL)
+	// This is to make liblzma produce the same output on big endian
+	// systems that it does on little endian systems. lz_encoder.c
+	// takes care of including the actual table.
+	extern const uint32_t lzma_lz_hash_table[256];
+#	define hash_table lzma_lz_hash_table
+#else
+#	include "check.h"
+#	define hash_table lzma_crc32_table[0]
+#endif
+
+#define HASH_2_SIZE (UINT32_C(1) << 10)
+#define HASH_3_SIZE (UINT32_C(1) << 16)
+#define HASH_4_SIZE (UINT32_C(1) << 20)
+
+#define HASH_2_MASK (HASH_2_SIZE - 1)
+#define HASH_3_MASK (HASH_3_SIZE - 1)
+#define HASH_4_MASK (HASH_4_SIZE - 1)
+
+#define FIX_3_HASH_SIZE (HASH_2_SIZE)
+#define FIX_4_HASH_SIZE (HASH_2_SIZE + HASH_3_SIZE)
+#define FIX_5_HASH_SIZE (HASH_2_SIZE + HASH_3_SIZE + HASH_4_SIZE)
+
+// Endianness doesn't matter in hash_2_calc() (no effect on the output).
+#ifdef TUKLIB_FAST_UNALIGNED_ACCESS
+#	define hash_2_calc() \
+		const uint32_t hash_value = *(const uint16_t *)(cur)
+#else
+#	define hash_2_calc() \
+		const uint32_t hash_value \
+			= (uint32_t)(cur[0]) | ((uint32_t)(cur[1]) << 8)
+#endif
+
+#define hash_3_calc() \
+	const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \
+	const uint32_t hash_2_value = temp & HASH_2_MASK; \
+	const uint32_t hash_value \
+			= (temp ^ ((uint32_t)(cur[2]) << 8)) & mf->hash_mask
+
+#define hash_4_calc() \
+	const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \
+	const uint32_t hash_2_value = temp & HASH_2_MASK; \
+	const uint32_t hash_3_value \
+			= (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK; \
+	const uint32_t hash_value = (temp ^ ((uint32_t)(cur[2]) << 8) \
+			^ (hash_table[cur[3]] << 5)) & mf->hash_mask
+
+
+// The following are not currently used.
+
+#define hash_5_calc() \
+	const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \
+	const uint32_t hash_2_value = temp & HASH_2_MASK; \
+	const uint32_t hash_3_value \
+			= (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK; \
+	uint32_t hash_4_value = (temp ^ ((uint32_t)(cur[2]) << 8) ^ \
+			^ hash_table[cur[3]] << 5); \
+	const uint32_t hash_value \
+			= (hash_4_value ^ (hash_table[cur[4]] << 3)) \
+				& mf->hash_mask; \
+	hash_4_value &= HASH_4_MASK
+
+/*
+#define hash_zip_calc() \
+	const uint32_t hash_value \
+			= (((uint32_t)(cur[0]) | ((uint32_t)(cur[1]) << 8)) \
+				^ hash_table[cur[2]]) & 0xFFFF
+*/
+
+#define hash_zip_calc() \
+	const uint32_t hash_value \
+			= (((uint32_t)(cur[2]) | ((uint32_t)(cur[0]) << 8)) \
+				^ hash_table[cur[1]]) & 0xFFFF
+
+#define mt_hash_2_calc() \
+	const uint32_t hash_2_value \
+			= (hash_table[cur[0]] ^ cur[1]) & HASH_2_MASK
+
+#define mt_hash_3_calc() \
+	const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \
+	const uint32_t hash_2_value = temp & HASH_2_MASK; \
+	const uint32_t hash_3_value \
+			= (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK
+
+#define mt_hash_4_calc() \
+	const uint32_t temp = hash_table[cur[0]] ^ cur[1]; \
+	const uint32_t hash_2_value = temp & HASH_2_MASK; \
+	const uint32_t hash_3_value \
+			= (temp ^ ((uint32_t)(cur[2]) << 8)) & HASH_3_MASK; \
+	const uint32_t hash_4_value = (temp ^ ((uint32_t)(cur[2]) << 8) ^ \
+			(hash_table[cur[3]] << 5)) & HASH_4_MASK
+
+#endif