1 files changed, 247 insertions, 0 deletions
diff --git a/src/isa-l/igzip/huffman.h b/src/isa-l/igzip/huffman.h
new file mode 100644
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+++ b/src/isa-l/igzip/huffman.h
@@ -0,0 +1,247 @@
+/**********************************************************************
+  Copyright(c) 2011-2016 Intel Corporation All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in
+      the documentation and/or other materials provided with the
+      distribution.
+    * Neither the name of Intel Corporation nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**********************************************************************/
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "igzip_lib.h"
+
+#ifdef _MSC_VER
+# include <intrin.h>
+# define inline __inline
+#else
+# include <x86intrin.h>
+#endif
+
+static inline uint32_t bsr(uint32_t val)
+{
+	uint32_t msb;
+#ifdef __LZCNT__
+	msb = 16 - __lzcnt16(val);
+#else
+	for(msb = 0; val > 0; val >>= 1)
+		msb++;
+#endif
+	return msb;
+}
+
+static inline uint32_t tzcnt(uint64_t val)
+{
+	uint32_t cnt;
+
+#ifdef __x86_64__
+
+	cnt = __builtin_ctzll(val) / 8;//__tzcnt_u64(val);
+
+#else
+	for(cnt = 8; val > 0; val <<= 8)
+		cnt -= 1;
+#endif
+	return cnt;
+}
+
+static void compute_dist_code(struct isal_hufftables *hufftables, uint16_t dist, uint64_t *p_code, uint64_t *p_len)
+{
+	assert(dist > IGZIP_DIST_TABLE_SIZE);
+
+	dist -= 1;
+	uint32_t msb;
+	uint32_t num_extra_bits;
+	uint32_t extra_bits;
+	uint32_t sym;
+	uint32_t len;
+	uint32_t code;
+
+	msb = bsr(dist);
+	assert(msb >= 1);
+	num_extra_bits = msb - 2;
+	extra_bits = dist & ((1 << num_extra_bits) - 1);
+	dist >>= num_extra_bits;
+	sym = dist + 2 * num_extra_bits;
+	assert(sym < 30);
+	code = hufftables->dcodes[sym - IGZIP_DECODE_OFFSET];
+	len = hufftables->dcodes_sizes[sym - IGZIP_DECODE_OFFSET];
+	*p_code = code | (extra_bits << len);
+	*p_len = len + num_extra_bits;
+}
+
+static inline void get_dist_code(struct isal_hufftables *hufftables, uint32_t dist, uint64_t *code, uint64_t *len)
+{
+	if (dist < 1)
+		dist = 0;
+	assert(dist >= 1);
+	assert(dist <= 32768);
+	if (dist <= IGZIP_DIST_TABLE_SIZE) {
+		uint64_t code_len;
+		code_len = hufftables->dist_table[dist - 1];
+		*code = code_len >> 5;
+		*len = code_len & 0x1F;
+	} else {
+		compute_dist_code(hufftables, dist, code, len);
+	}
+}
+
+static inline void get_len_code(struct isal_hufftables *hufftables, uint32_t length, uint64_t *code, uint64_t *len)
+{
+	assert(length >= 3);
+	assert(length <= 258);
+
+	uint64_t code_len;
+	code_len = hufftables->len_table[length - 3];
+	*code = code_len >> 5;
+	*len = code_len & 0x1F;
+}
+
+static inline void get_lit_code(struct isal_hufftables *hufftables, uint32_t lit, uint64_t *code, uint64_t *len)
+{
+	assert(lit <= 256);
+
+	*code = hufftables->lit_table[lit];
+	*len = hufftables->lit_table_sizes[lit];
+}
+
+static void compute_dist_icf_code(uint32_t dist, uint32_t *code, uint32_t *extra_bits)
+{
+	uint32_t msb;
+	uint32_t num_extra_bits;
+
+	dist -= 1;
+	msb = bsr(dist);
+	assert(msb >= 1);
+	num_extra_bits = msb - 2;
+	*extra_bits = dist & ((1 << num_extra_bits) - 1);
+	dist >>= num_extra_bits;
+	*code = dist + 2 * num_extra_bits;
+	assert(*code < 30);
+}
+
+static inline void get_dist_icf_code(uint32_t dist, uint32_t *code, uint32_t *extra_bits)
+{
+	assert(dist >= 1);
+	assert(dist <= 32768);
+	if (dist <= 2) {
+		*code = dist - 1;
+		*extra_bits = 0;
+	} else {
+		compute_dist_icf_code(dist, code, extra_bits);
+	}
+}
+
+static inline void get_len_icf_code(uint32_t length, uint32_t *code)
+{
+	assert(length >= 3);
+	assert(length <= 258);
+
+	*code = length + 254;
+}
+
+static inline void get_lit_icf_code(uint32_t lit, uint32_t *code)
+{
+	assert(lit <= 256);
+
+	*code = lit;
+}
+
+/**
+ * @brief Returns a hash of the first 3 bytes of input data.
+ */
+static inline uint32_t compute_hash(uint32_t data)
+{
+#ifdef __SSE4_2__
+
+	return _mm_crc32_u32(0, data);
+
+#else
+	/* Use multiplication to create a hash, 0xBDD06057 is a prime number */
+	return ((uint64_t)data * 0xB2D06057) >> 16;
+
+#endif /* __SSE4_2__ */
+}
+
+
+/**
+ * @brief Returns how long str1 and str2 have the same symbols.
+ * @param str1: First input string.
+ * @param str2: Second input string.
+ * @param max_length: length of the smaller string.
+ */
+static inline int compare258(uint8_t * str1, uint8_t * str2, uint32_t max_length)
+{
+	uint32_t count;
+	uint64_t test;
+	uint64_t loop_length;
+
+	if(max_length > 258)
+		max_length = 258;
+
+	loop_length = max_length & ~0x7;
+
+	for(count = 0; count < loop_length; count += 8){
+		test = *(uint64_t *) str1;
+		test ^= *(uint64_t *) str2;
+		if(test != 0)
+			return count + tzcnt(test);
+		str1 += 8;
+		str2 += 8;
+	}
+
+	switch(max_length % 8){
+
+	case 7:
+		if(*str1++ != *str2++)
+			return count;
+		count++;
+	case 6:
+		if(*str1++ != *str2++)
+			return count;
+		count++;
+	case 5:
+		if(*str1++ != *str2++)
+			return count;
+		count++;
+	case 4:
+		if(*str1++ != *str2++)
+			return count;
+		count++;
+	case 3:
+		if(*str1++ != *str2++)
+			return count;
+		count++;
+	case 2:
+		if(*str1++ != *str2++)
+			return count;
+		count++;
+	case 1:
+		if(*str1 != *str2)
+			return count;
+		count++;
+	}
+
+	return count;
+}