Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 795 insertions, 0 deletions

diff --git a/lib/zstd/fse_compress.c b/lib/zstd/fse_compress.c
new file mode 100644
index 000000000..ef3d1741d
--- /dev/null
+++ b/lib/zstd/fse_compress.c
@@ -0,0 +1,795 @@
+/*
+ * FSE : Finite State Entropy encoder
+ * Copyright (C) 2013-2015, Yann Collet.
+ *
+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation. This program is dual-licensed; you may select
+ * either version 2 of the GNU General Public License ("GPL") or BSD license
+ * ("BSD").
+ *
+ * You can contact the author at :
+ * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
+ */
+
+/* **************************************************************
+*  Compiler specifics
+****************************************************************/
+#define FORCE_INLINE static __always_inline
+
+/* **************************************************************
+*  Includes
+****************************************************************/
+#include "bitstream.h"
+#include "fse.h"
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/string.h> /* memcpy, memset */
+
+/* **************************************************************
+*  Error Management
+****************************************************************/
+#define FSE_STATIC_ASSERT(c)                                   \
+	{                                                      \
+		enum { FSE_static_assert = 1 / (int)(!!(c)) }; \
+	} /* use only *after* variable declarations */
+
+/* **************************************************************
+*  Templates
+****************************************************************/
+/*
+  designed to be included
+  for type-specific functions (template emulation in C)
+  Objective is to write these functions only once, for improved maintenance
+*/
+
+/* safety checks */
+#ifndef FSE_FUNCTION_EXTENSION
+#error "FSE_FUNCTION_EXTENSION must be defined"
+#endif
+#ifndef FSE_FUNCTION_TYPE
+#error "FSE_FUNCTION_TYPE must be defined"
+#endif
+
+/* Function names */
+#define FSE_CAT(X, Y) X##Y
+#define FSE_FUNCTION_NAME(X, Y) FSE_CAT(X, Y)
+#define FSE_TYPE_NAME(X, Y) FSE_CAT(X, Y)
+
+/* Function templates */
+
+/* FSE_buildCTable_wksp() :
+ * Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`).
+ * wkspSize should be sized to handle worst case situation, which is `1<<max_tableLog * sizeof(FSE_FUNCTION_TYPE)`
+ * workSpace must also be properly aligned with FSE_FUNCTION_TYPE requirements
+ */
+size_t FSE_buildCTable_wksp(FSE_CTable *ct, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void *workspace, size_t workspaceSize)
+{
+	U32 const tableSize = 1 << tableLog;
+	U32 const tableMask = tableSize - 1;
+	void *const ptr = ct;
+	U16 *const tableU16 = ((U16 *)ptr) + 2;
+	void *const FSCT = ((U32 *)ptr) + 1 /* header */ + (tableLog ? tableSize >> 1 : 1);
+	FSE_symbolCompressionTransform *const symbolTT = (FSE_symbolCompressionTransform *)(FSCT);
+	U32 const step = FSE_TABLESTEP(tableSize);
+	U32 highThreshold = tableSize - 1;
+
+	U32 *cumul;
+	FSE_FUNCTION_TYPE *tableSymbol;
+	size_t spaceUsed32 = 0;
+
+	cumul = (U32 *)workspace + spaceUsed32;
+	spaceUsed32 += FSE_MAX_SYMBOL_VALUE + 2;
+	tableSymbol = (FSE_FUNCTION_TYPE *)((U32 *)workspace + spaceUsed32);
+	spaceUsed32 += ALIGN(sizeof(FSE_FUNCTION_TYPE) * ((size_t)1 << tableLog), sizeof(U32)) >> 2;
+
+	if ((spaceUsed32 << 2) > workspaceSize)
+		return ERROR(tableLog_tooLarge);
+	workspace = (U32 *)workspace + spaceUsed32;
+	workspaceSize -= (spaceUsed32 << 2);
+
+	/* CTable header */
+	tableU16[-2] = (U16)tableLog;
+	tableU16[-1] = (U16)maxSymbolValue;
+
+	/* For explanations on how to distribute symbol values over the table :
+	*  http://fastcompression.blogspot.fr/2014/02/fse-distributing-symbol-values.html */
+
+	/* symbol start positions */
+	{
+		U32 u;
+		cumul[0] = 0;
+		for (u = 1; u <= maxSymbolValue + 1; u++) {
+			if (normalizedCounter[u - 1] == -1) { /* Low proba symbol */
+				cumul[u] = cumul[u - 1] + 1;
+				tableSymbol[highThreshold--] = (FSE_FUNCTION_TYPE)(u - 1);
+			} else {
+				cumul[u] = cumul[u - 1] + normalizedCounter[u - 1];
+			}
+		}
+		cumul[maxSymbolValue + 1] = tableSize + 1;
+	}
+
+	/* Spread symbols */
+	{
+		U32 position = 0;
+		U32 symbol;
+		for (symbol = 0; symbol <= maxSymbolValue; symbol++) {
+			int nbOccurences;
+			for (nbOccurences = 0; nbOccurences < normalizedCounter[symbol]; nbOccurences++) {
+				tableSymbol[position] = (FSE_FUNCTION_TYPE)symbol;
+				position = (position + step) & tableMask;
+				while (position > highThreshold)
+					position = (position + step) & tableMask; /* Low proba area */
+			}
+		}
+
+		if (position != 0)
+			return ERROR(GENERIC); /* Must have gone through all positions */
+	}
+
+	/* Build table */
+	{
+		U32 u;
+		for (u = 0; u < tableSize; u++) {
+			FSE_FUNCTION_TYPE s = tableSymbol[u];	/* note : static analyzer may not understand tableSymbol is properly initialized */
+			tableU16[cumul[s]++] = (U16)(tableSize + u); /* TableU16 : sorted by symbol order; gives next state value */
+		}
+	}
+
+	/* Build Symbol Transformation Table */
+	{
+		unsigned total = 0;
+		unsigned s;
+		for (s = 0; s <= maxSymbolValue; s++) {
+			switch (normalizedCounter[s]) {
+			case 0: break;
+
+			case -1:
+			case 1:
+				symbolTT[s].deltaNbBits = (tableLog << 16) - (1 << tableLog);
+				symbolTT[s].deltaFindState = total - 1;
+				total++;
+				break;
+			default: {
+				U32 const maxBitsOut = tableLog - BIT_highbit32(normalizedCounter[s] - 1);
+				U32 const minStatePlus = normalizedCounter[s] << maxBitsOut;
+				symbolTT[s].deltaNbBits = (maxBitsOut << 16) - minStatePlus;
+				symbolTT[s].deltaFindState = total - normalizedCounter[s];
+				total += normalizedCounter[s];
+			}
+			}
+		}
+	}
+
+	return 0;
+}
+
+/*-**************************************************************
+*  FSE NCount encoding-decoding
+****************************************************************/
+size_t FSE_NCountWriteBound(unsigned maxSymbolValue, unsigned tableLog)
+{
+	size_t const maxHeaderSize = (((maxSymbolValue + 1) * tableLog) >> 3) + 3;
+	return maxSymbolValue ? maxHeaderSize : FSE_NCOUNTBOUND; /* maxSymbolValue==0 ? use default */
+}
+
+static size_t FSE_writeNCount_generic(void *header, size_t headerBufferSize, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog,
+				      unsigned writeIsSafe)
+{
+	BYTE *const ostart = (BYTE *)header;
+	BYTE *out = ostart;
+	BYTE *const oend = ostart + headerBufferSize;
+	int nbBits;
+	const int tableSize = 1 << tableLog;
+	int remaining;
+	int threshold;
+	U32 bitStream;
+	int bitCount;
+	unsigned charnum = 0;
+	int previous0 = 0;
+
+	bitStream = 0;
+	bitCount = 0;
+	/* Table Size */
+	bitStream += (tableLog - FSE_MIN_TABLELOG) << bitCount;
+	bitCount += 4;
+
+	/* Init */
+	remaining = tableSize + 1; /* +1 for extra accuracy */
+	threshold = tableSize;
+	nbBits = tableLog + 1;
+
+	while (remaining > 1) { /* stops at 1 */
+		if (previous0) {
+			unsigned start = charnum;
+			while (!normalizedCounter[charnum])
+				charnum++;
+			while (charnum >= start + 24) {
+				start += 24;
+				bitStream += 0xFFFFU << bitCount;
+				if ((!writeIsSafe) && (out > oend - 2))
+					return ERROR(dstSize_tooSmall); /* Buffer overflow */
+				out[0] = (BYTE)bitStream;
+				out[1] = (BYTE)(bitStream >> 8);
+				out += 2;
+				bitStream >>= 16;
+			}
+			while (charnum >= start + 3) {
+				start += 3;
+				bitStream += 3 << bitCount;
+				bitCount += 2;
+			}
+			bitStream += (charnum - start) << bitCount;
+			bitCount += 2;
+			if (bitCount > 16) {
+				if ((!writeIsSafe) && (out > oend - 2))
+					return ERROR(dstSize_tooSmall); /* Buffer overflow */
+				out[0] = (BYTE)bitStream;
+				out[1] = (BYTE)(bitStream >> 8);
+				out += 2;
+				bitStream >>= 16;
+				bitCount -= 16;
+			}
+		}
+		{
+			int count = normalizedCounter[charnum++];
+			int const max = (2 * threshold - 1) - remaining;
+			remaining -= count < 0 ? -count : count;
+			count++; /* +1 for extra accuracy */
+			if (count >= threshold)
+				count += max; /* [0..max[ [max..threshold[ (...) [threshold+max 2*threshold[ */
+			bitStream += count << bitCount;
+			bitCount += nbBits;
+			bitCount -= (count < max);
+			previous0 = (count == 1);
+			if (remaining < 1)
+				return ERROR(GENERIC);
+			while (remaining < threshold)
+				nbBits--, threshold >>= 1;
+		}
+		if (bitCount > 16) {
+			if ((!writeIsSafe) && (out > oend - 2))
+				return ERROR(dstSize_tooSmall); /* Buffer overflow */
+			out[0] = (BYTE)bitStream;
+			out[1] = (BYTE)(bitStream >> 8);
+			out += 2;
+			bitStream >>= 16;
+			bitCount -= 16;
+		}
+	}
+
+	/* flush remaining bitStream */
+	if ((!writeIsSafe) && (out > oend - 2))
+		return ERROR(dstSize_tooSmall); /* Buffer overflow */
+	out[0] = (BYTE)bitStream;
+	out[1] = (BYTE)(bitStream >> 8);
+	out += (bitCount + 7) / 8;
+
+	if (charnum > maxSymbolValue + 1)
+		return ERROR(GENERIC);
+
+	return (out - ostart);
+}
+
+size_t FSE_writeNCount(void *buffer, size_t bufferSize, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
+{
+	if (tableLog > FSE_MAX_TABLELOG)
+		return ERROR(tableLog_tooLarge); /* Unsupported */
+	if (tableLog < FSE_MIN_TABLELOG)
+		return ERROR(GENERIC); /* Unsupported */
+
+	if (bufferSize < FSE_NCountWriteBound(maxSymbolValue, tableLog))
+		return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 0);
+
+	return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 1);
+}
+
+/*-**************************************************************
+*  Counting histogram
+****************************************************************/
+/*! FSE_count_simple
+	This function counts byte values within `src`, and store the histogram into table `count`.
+	It doesn't use any additional memory.
+	But this function is unsafe : it doesn't check that all values within `src` can fit into `count`.
+	For this reason, prefer using a table `count` with 256 elements.
+	@return : count of most numerous element
+*/
+size_t FSE_count_simple(unsigned *count, unsigned *maxSymbolValuePtr, const void *src, size_t srcSize)
+{
+	const BYTE *ip = (const BYTE *)src;
+	const BYTE *const end = ip + srcSize;
+	unsigned maxSymbolValue = *maxSymbolValuePtr;
+	unsigned max = 0;
+
+	memset(count, 0, (maxSymbolValue + 1) * sizeof(*count));
+	if (srcSize == 0) {
+		*maxSymbolValuePtr = 0;
+		return 0;
+	}
+
+	while (ip < end)
+		count[*ip++]++;
+
+	while (!count[maxSymbolValue])
+		maxSymbolValue--;
+	*maxSymbolValuePtr = maxSymbolValue;
+
+	{
+		U32 s;
+		for (s = 0; s <= maxSymbolValue; s++)
+			if (count[s] > max)
+				max = count[s];
+	}
+
+	return (size_t)max;
+}
+
+/* FSE_count_parallel_wksp() :
+ * Same as FSE_count_parallel(), but using an externally provided scratch buffer.
+ * `workSpace` size must be a minimum of `1024 * sizeof(unsigned)`` */
+static size_t FSE_count_parallel_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned checkMax,
+				      unsigned *const workSpace)
+{
+	const BYTE *ip = (const BYTE *)source;
+	const BYTE *const iend = ip + sourceSize;
+	unsigned maxSymbolValue = *maxSymbolValuePtr;
+	unsigned max = 0;
+	U32 *const Counting1 = workSpace;
+	U32 *const Counting2 = Counting1 + 256;
+	U32 *const Counting3 = Counting2 + 256;
+	U32 *const Counting4 = Counting3 + 256;
+
+	memset(Counting1, 0, 4 * 256 * sizeof(unsigned));
+
+	/* safety checks */
+	if (!sourceSize) {
+		memset(count, 0, maxSymbolValue + 1);
+		*maxSymbolValuePtr = 0;
+		return 0;
+	}
+	if (!maxSymbolValue)
+		maxSymbolValue = 255; /* 0 == default */
+
+	/* by stripes of 16 bytes */
+	{
+		U32 cached = ZSTD_read32(ip);
+		ip += 4;
+		while (ip < iend - 15) {
+			U32 c = cached;
+			cached = ZSTD_read32(ip);
+			ip += 4;
+			Counting1[(BYTE)c]++;
+			Counting2[(BYTE)(c >> 8)]++;
+			Counting3[(BYTE)(c >> 16)]++;
+			Counting4[c >> 24]++;
+			c = cached;
+			cached = ZSTD_read32(ip);
+			ip += 4;
+			Counting1[(BYTE)c]++;
+			Counting2[(BYTE)(c >> 8)]++;
+			Counting3[(BYTE)(c >> 16)]++;
+			Counting4[c >> 24]++;
+			c = cached;
+			cached = ZSTD_read32(ip);
+			ip += 4;
+			Counting1[(BYTE)c]++;
+			Counting2[(BYTE)(c >> 8)]++;
+			Counting3[(BYTE)(c >> 16)]++;
+			Counting4[c >> 24]++;
+			c = cached;
+			cached = ZSTD_read32(ip);
+			ip += 4;
+			Counting1[(BYTE)c]++;
+			Counting2[(BYTE)(c >> 8)]++;
+			Counting3[(BYTE)(c >> 16)]++;
+			Counting4[c >> 24]++;
+		}
+		ip -= 4;
+	}
+
+	/* finish last symbols */
+	while (ip < iend)
+		Counting1[*ip++]++;
+
+	if (checkMax) { /* verify stats will fit into destination table */
+		U32 s;
+		for (s = 255; s > maxSymbolValue; s--) {
+			Counting1[s] += Counting2[s] + Counting3[s] + Counting4[s];
+			if (Counting1[s])
+				return ERROR(maxSymbolValue_tooSmall);
+		}
+	}
+
+	{
+		U32 s;
+		for (s = 0; s <= maxSymbolValue; s++) {
+			count[s] = Counting1[s] + Counting2[s] + Counting3[s] + Counting4[s];
+			if (count[s] > max)
+				max = count[s];
+		}
+	}
+
+	while (!count[maxSymbolValue])
+		maxSymbolValue--;
+	*maxSymbolValuePtr = maxSymbolValue;
+	return (size_t)max;
+}
+
+/* FSE_countFast_wksp() :
+ * Same as FSE_countFast(), but using an externally provided scratch buffer.
+ * `workSpace` size must be table of >= `1024` unsigned */
+size_t FSE_countFast_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned *workSpace)
+{
+	if (sourceSize < 1500)
+		return FSE_count_simple(count, maxSymbolValuePtr, source, sourceSize);
+	return FSE_count_parallel_wksp(count, maxSymbolValuePtr, source, sourceSize, 0, workSpace);
+}
+
+/* FSE_count_wksp() :
+ * Same as FSE_count(), but using an externally provided scratch buffer.
+ * `workSpace` size must be table of >= `1024` unsigned */
+size_t FSE_count_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned *workSpace)
+{
+	if (*maxSymbolValuePtr < 255)
+		return FSE_count_parallel_wksp(count, maxSymbolValuePtr, source, sourceSize, 1, workSpace);
+	*maxSymbolValuePtr = 255;
+	return FSE_countFast_wksp(count, maxSymbolValuePtr, source, sourceSize, workSpace);
+}
+
+/*-**************************************************************
+*  FSE Compression Code
+****************************************************************/
+/*! FSE_sizeof_CTable() :
+	FSE_CTable is a variable size structure which contains :
+	`U16 tableLog;`
+	`U16 maxSymbolValue;`
+	`U16 nextStateNumber[1 << tableLog];`                         // This size is variable
+	`FSE_symbolCompressionTransform symbolTT[maxSymbolValue+1];`  // This size is variable
+Allocation is manual (C standard does not support variable-size structures).
+*/
+size_t FSE_sizeof_CTable(unsigned maxSymbolValue, unsigned tableLog)
+{
+	if (tableLog > FSE_MAX_TABLELOG)
+		return ERROR(tableLog_tooLarge);
+	return FSE_CTABLE_SIZE_U32(tableLog, maxSymbolValue) * sizeof(U32);
+}
+
+/* provides the minimum logSize to safely represent a distribution */
+static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue)
+{
+	U32 minBitsSrc = BIT_highbit32((U32)(srcSize - 1)) + 1;
+	U32 minBitsSymbols = BIT_highbit32(maxSymbolValue) + 2;
+	U32 minBits = minBitsSrc < minBitsSymbols ? minBitsSrc : minBitsSymbols;
+	return minBits;
+}
+
+unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus)
+{
+	U32 maxBitsSrc = BIT_highbit32((U32)(srcSize - 1)) - minus;
+	U32 tableLog = maxTableLog;
+	U32 minBits = FSE_minTableLog(srcSize, maxSymbolValue);
+	if (tableLog == 0)
+		tableLog = FSE_DEFAULT_TABLELOG;
+	if (maxBitsSrc < tableLog)
+		tableLog = maxBitsSrc; /* Accuracy can be reduced */
+	if (minBits > tableLog)
+		tableLog = minBits; /* Need a minimum to safely represent all symbol values */
+	if (tableLog < FSE_MIN_TABLELOG)
+		tableLog = FSE_MIN_TABLELOG;
+	if (tableLog > FSE_MAX_TABLELOG)
+		tableLog = FSE_MAX_TABLELOG;
+	return tableLog;
+}
+
+unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue)
+{
+	return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 2);
+}
+
+/* Secondary normalization method.
+   To be used when primary method fails. */
+
+static size_t FSE_normalizeM2(short *norm, U32 tableLog, const unsigned *count, size_t total, U32 maxSymbolValue)
+{
+	short const NOT_YET_ASSIGNED = -2;
+	U32 s;
+	U32 distributed = 0;
+	U32 ToDistribute;
+
+	/* Init */
+	U32 const lowThreshold = (U32)(total >> tableLog);
+	U32 lowOne = (U32)((total * 3) >> (tableLog + 1));
+
+	for (s = 0; s <= maxSymbolValue; s++) {
+		if (count[s] == 0) {
+			norm[s] = 0;
+			continue;
+		}
+		if (count[s] <= lowThreshold) {
+			norm[s] = -1;
+			distributed++;
+			total -= count[s];
+			continue;
+		}
+		if (count[s] <= lowOne) {
+			norm[s] = 1;
+			distributed++;
+			total -= count[s];
+			continue;
+		}
+
+		norm[s] = NOT_YET_ASSIGNED;
+	}
+	ToDistribute = (1 << tableLog) - distributed;
+
+	if ((total / ToDistribute) > lowOne) {
+		/* risk of rounding to zero */
+		lowOne = (U32)((total * 3) / (ToDistribute * 2));
+		for (s = 0; s <= maxSymbolValue; s++) {
+			if ((norm[s] == NOT_YET_ASSIGNED) && (count[s] <= lowOne)) {
+				norm[s] = 1;
+				distributed++;
+				total -= count[s];
+				continue;
+			}
+		}
+		ToDistribute = (1 << tableLog) - distributed;
+	}
+
+	if (distributed == maxSymbolValue + 1) {
+		/* all values are pretty poor;
+		   probably incompressible data (should have already been detected);
+		   find max, then give all remaining points to max */
+		U32 maxV = 0, maxC = 0;
+		for (s = 0; s <= maxSymbolValue; s++)
+			if (count[s] > maxC)
+				maxV = s, maxC = count[s];
+		norm[maxV] += (short)ToDistribute;
+		return 0;
+	}
+
+	if (total == 0) {
+		/* all of the symbols were low enough for the lowOne or lowThreshold */
+		for (s = 0; ToDistribute > 0; s = (s + 1) % (maxSymbolValue + 1))
+			if (norm[s] > 0)
+				ToDistribute--, norm[s]++;
+		return 0;
+	}
+
+	{
+		U64 const vStepLog = 62 - tableLog;
+		U64 const mid = (1ULL << (vStepLog - 1)) - 1;
+		U64 const rStep = div_u64((((U64)1 << vStepLog) * ToDistribute) + mid, (U32)total); /* scale on remaining */
+		U64 tmpTotal = mid;
+		for (s = 0; s <= maxSymbolValue; s++) {
+			if (norm[s] == NOT_YET_ASSIGNED) {
+				U64 const end = tmpTotal + (count[s] * rStep);
+				U32 const sStart = (U32)(tmpTotal >> vStepLog);
+				U32 const sEnd = (U32)(end >> vStepLog);
+				U32 const weight = sEnd - sStart;
+				if (weight < 1)
+					return ERROR(GENERIC);
+				norm[s] = (short)weight;
+				tmpTotal = end;
+			}
+		}
+	}
+
+	return 0;
+}
+
+size_t FSE_normalizeCount(short *normalizedCounter, unsigned tableLog, const unsigned *count, size_t total, unsigned maxSymbolValue)
+{
+	/* Sanity checks */
+	if (tableLog == 0)
+		tableLog = FSE_DEFAULT_TABLELOG;
+	if (tableLog < FSE_MIN_TABLELOG)
+		return ERROR(GENERIC); /* Unsupported size */
+	if (tableLog > FSE_MAX_TABLELOG)
+		return ERROR(tableLog_tooLarge); /* Unsupported size */
+	if (tableLog < FSE_minTableLog(total, maxSymbolValue))
+		return ERROR(GENERIC); /* Too small tableLog, compression potentially impossible */
+
+	{
+		U32 const rtbTable[] = {0, 473195, 504333, 520860, 550000, 700000, 750000, 830000};
+		U64 const scale = 62 - tableLog;
+		U64 const step = div_u64((U64)1 << 62, (U32)total); /* <== here, one division ! */
+		U64 const vStep = 1ULL << (scale - 20);
+		int stillToDistribute = 1 << tableLog;
+		unsigned s;
+		unsigned largest = 0;
+		short largestP = 0;
+		U32 lowThreshold = (U32)(total >> tableLog);
+
+		for (s = 0; s <= maxSymbolValue; s++) {
+			if (count[s] == total)
+				return 0; /* rle special case */
+			if (count[s] == 0) {
+				normalizedCounter[s] = 0;
+				continue;
+			}
+			if (count[s] <= lowThreshold) {
+				normalizedCounter[s] = -1;
+				stillToDistribute--;
+			} else {
+				short proba = (short)((count[s] * step) >> scale);
+				if (proba < 8) {
+					U64 restToBeat = vStep * rtbTable[proba];
+					proba += (count[s] * step) - ((U64)proba << scale) > restToBeat;
+				}
+				if (proba > largestP)
+					largestP = proba, largest = s;
+				normalizedCounter[s] = proba;
+				stillToDistribute -= proba;
+			}
+		}
+		if (-stillToDistribute >= (normalizedCounter[largest] >> 1)) {
+			/* corner case, need another normalization method */
+			size_t const errorCode = FSE_normalizeM2(normalizedCounter, tableLog, count, total, maxSymbolValue);
+			if (FSE_isError(errorCode))
+				return errorCode;
+		} else
+			normalizedCounter[largest] += (short)stillToDistribute;
+	}
+
+	return tableLog;
+}
+
+/* fake FSE_CTable, for raw (uncompressed) input */
+size_t FSE_buildCTable_raw(FSE_CTable *ct, unsigned nbBits)
+{
+	const unsigned tableSize = 1 << nbBits;
+	const unsigned tableMask = tableSize - 1;
+	const unsigned maxSymbolValue = tableMask;
+	void *const ptr = ct;
+	U16 *const tableU16 = ((U16 *)ptr) + 2;
+	void *const FSCT = ((U32 *)ptr) + 1 /* header */ + (tableSize >> 1); /* assumption : tableLog >= 1 */
+	FSE_symbolCompressionTransform *const symbolTT = (FSE_symbolCompressionTransform *)(FSCT);
+	unsigned s;
+
+	/* Sanity checks */
+	if (nbBits < 1)
+		return ERROR(GENERIC); /* min size */
+
+	/* header */
+	tableU16[-2] = (U16)nbBits;
+	tableU16[-1] = (U16)maxSymbolValue;
+
+	/* Build table */
+	for (s = 0; s < tableSize; s++)
+		tableU16[s] = (U16)(tableSize + s);
+
+	/* Build Symbol Transformation Table */
+	{
+		const U32 deltaNbBits = (nbBits << 16) - (1 << nbBits);
+		for (s = 0; s <= maxSymbolValue; s++) {
+			symbolTT[s].deltaNbBits = deltaNbBits;
+			symbolTT[s].deltaFindState = s - 1;
+		}
+	}
+
+	return 0;
+}
+
+/* fake FSE_CTable, for rle input (always same symbol) */
+size_t FSE_buildCTable_rle(FSE_CTable *ct, BYTE symbolValue)
+{
+	void *ptr = ct;
+	U16 *tableU16 = ((U16 *)ptr) + 2;
+	void *FSCTptr = (U32 *)ptr + 2;
+	FSE_symbolCompressionTransform *symbolTT = (FSE_symbolCompressionTransform *)FSCTptr;
+
+	/* header */
+	tableU16[-2] = (U16)0;
+	tableU16[-1] = (U16)symbolValue;
+
+	/* Build table */
+	tableU16[0] = 0;
+	tableU16[1] = 0; /* just in case */
+
+	/* Build Symbol Transformation Table */
+	symbolTT[symbolValue].deltaNbBits = 0;
+	symbolTT[symbolValue].deltaFindState = 0;
+
+	return 0;
+}
+
+static size_t FSE_compress_usingCTable_generic(void *dst, size_t dstSize, const void *src, size_t srcSize, const FSE_CTable *ct, const unsigned fast)
+{
+	const BYTE *const istart = (const BYTE *)src;
+	const BYTE *const iend = istart + srcSize;
+	const BYTE *ip = iend;
+
+	BIT_CStream_t bitC;
+	FSE_CState_t CState1, CState2;
+
+	/* init */
+	if (srcSize <= 2)
+		return 0;
+	{
+		size_t const initError = BIT_initCStream(&bitC, dst, dstSize);
+		if (FSE_isError(initError))
+			return 0; /* not enough space available to write a bitstream */
+	}
+
+#define FSE_FLUSHBITS(s) (fast ? BIT_flushBitsFast(s) : BIT_flushBits(s))
+
+	if (srcSize & 1) {
+		FSE_initCState2(&CState1, ct, *--ip);
+		FSE_initCState2(&CState2, ct, *--ip);
+		FSE_encodeSymbol(&bitC, &CState1, *--ip);
+		FSE_FLUSHBITS(&bitC);
+	} else {
+		FSE_initCState2(&CState2, ct, *--ip);
+		FSE_initCState2(&CState1, ct, *--ip);
+	}
+
+	/* join to mod 4 */
+	srcSize -= 2;
+	if ((sizeof(bitC.bitContainer) * 8 > FSE_MAX_TABLELOG * 4 + 7) && (srcSize & 2)) { /* test bit 2 */
+		FSE_encodeSymbol(&bitC, &CState2, *--ip);
+		FSE_encodeSymbol(&bitC, &CState1, *--ip);
+		FSE_FLUSHBITS(&bitC);
+	}
+
+	/* 2 or 4 encoding per loop */
+	while (ip > istart) {
+
+		FSE_encodeSymbol(&bitC, &CState2, *--ip);
+
+		if (sizeof(bitC.bitContainer) * 8 < FSE_MAX_TABLELOG * 2 + 7) /* this test must be static */
+			FSE_FLUSHBITS(&bitC);
+
+		FSE_encodeSymbol(&bitC, &CState1, *--ip);
+
+		if (sizeof(bitC.bitContainer) * 8 > FSE_MAX_TABLELOG * 4 + 7) { /* this test must be static */
+			FSE_encodeSymbol(&bitC, &CState2, *--ip);
+			FSE_encodeSymbol(&bitC, &CState1, *--ip);
+		}
+
+		FSE_FLUSHBITS(&bitC);
+	}
+
+	FSE_flushCState(&bitC, &CState2);
+	FSE_flushCState(&bitC, &CState1);
+	return BIT_closeCStream(&bitC);
+}
+
+size_t FSE_compress_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const FSE_CTable *ct)
+{
+	unsigned const fast = (dstSize >= FSE_BLOCKBOUND(srcSize));
+
+	if (fast)
+		return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 1);
+	else
+		return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 0);
+}
+
+size_t FSE_compressBound(size_t size) { return FSE_COMPRESSBOUND(size); }