Add Fast LZMA2 codec

C/fast-lzma2/fl2_internal.h

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ * Modified for FL2 by Conor McCarthy
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+#ifndef FL2_INTERNAL_H_
+#define FL2_INTERNAL_H_
+
+
+/*-*************************************
+*  Dependencies
+***************************************/
+#include "mem.h"
+#include "compiler.h"
+#include "fl2_error_private.h"
+
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+#define FL2_PROP_HASH_BIT 7
+#define FL2_LZMA_PROP_MASK 0x3FU
+#ifndef NO_XXHASH
+#  define XXHASH_SIZEOF sizeof(XXH32_canonical_t)
+#endif
+
+/*-*************************************
+*  Debug
+***************************************/
+#if defined(FL2_DEBUG) && (FL2_DEBUG>=1)
+#  include <assert.h>
+#else
+#  ifndef assert
+#    define assert(condition) ((void)0)
+#  endif
+#endif
+
+#define FL2_STATIC_ASSERT(c) { enum { FL2_static_assert = 1/(int)(!!(c)) }; }
+
+#if defined(FL2_DEBUG) && (FL2_DEBUG>=2)
+#  include <stdio.h>
+extern int g_debuglog_enable;
+/* recommended values for FL2_DEBUG display levels :
+ * 1 : no display, enables assert() only
+ * 2 : reserved for currently active debugging path
+ * 3 : events once per object lifetime (CCtx, CDict)
+ * 4 : events once per frame
+ * 5 : events once per block
+ * 6 : events once per sequence (*very* verbose) */
+#  define RAWLOG(l, ...) {                                 \
+                if ((g_debuglog_enable) & (l<=FL2_DEBUG)) { \
+                    fprintf(stderr, __VA_ARGS__);            \
+            }   }
+#  define DEBUGLOG(l, ...) {                                 \
+                if ((g_debuglog_enable) & (l<=FL2_DEBUG)) { \
+                    fprintf(stderr, __FILE__ ": ");          \
+                    fprintf(stderr, __VA_ARGS__);            \
+                    fprintf(stderr, " \n");                  \
+            }   }
+#else
+#  define RAWLOG(l, ...)      {}    /* disabled */
+#  define DEBUGLOG(l, ...)    {}    /* disabled */
+#endif
+
+
+/*-*************************************
+*  shared macros
+***************************************/
+#undef MIN
+#undef MAX
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+#define MAX(a,b) ((a)>(b) ? (a) : (b))
+#define CHECK_F(f) { size_t const errcod = f; if (ERR_isError(errcod)) return errcod; }  /* check and Forward error code */
+#define CHECK_E(f, e) { size_t const errcod = f; if (ERR_isError(errcod)) return FL2_ERROR(e); }  /* check and send Error code */
+
+MEM_STATIC U32 ZSTD_highbit32(U32 val)
+{
+    assert(val != 0);
+    {
+#   if defined(_MSC_VER)   /* Visual */
+        unsigned long r=0;
+        _BitScanReverse(&r, val);
+        return (unsigned)r;
+#   elif defined(__GNUC__) && (__GNUC__ >= 3)   /* GCC Intrinsic */
+        return 31 - __builtin_clz(val);
+#   else   /* Software version */
+        static const int DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 };
+        U32 v = val;
+        int r;
+        v |= v >> 1;
+        v |= v >> 2;
+        v |= v >> 4;
+        v |= v >> 8;
+        v |= v >> 16;
+        r = DeBruijnClz[(U32)(v * 0x07C4ACDDU) >> 27];
+        return r;
+#   endif
+    }
+}
+
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif   /* FL2_INTERNAL_H_ */