integrate lzma

[zpackage] / lzma / lz / lz_encoder_hash.h

diff --git a/lzma/lz/lz_encoder_hash.h b/lzma/lz/lz_encoder_hash.h
new file mode 100644 (file)
index 0000000..342a333
--- /dev/null
+++ 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