Update LZ4 to 1.7.5.

Source/ThirdParty/LZ4/LICENSE

@@ -0,0 +1,24 @@
+LZ4 Library
+Copyright (c) 2011-2016, Yann Collet
+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.
+
+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 HOLDER 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.

Source/ThirdParty/LZ4/lz4.h

@@ -1,7 +1,7 @@
 /*
-   LZ4 - Fast LZ compression algorithm
-   Header File
-   Copyright (C) 2011-2015, Yann Collet.
+ *  LZ4 - Fast LZ compression algorithm
+ *  Header File
+ *  Copyright (C) 2011-2016, Yann Collet.
 
    BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
 
@@ -29,34 +29,79 @@
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
    You can contact the author at :
-   - LZ4 source repository : https://github.com/Cyan4973/lz4
-   - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
+    - LZ4 homepage : http://www.lz4.org
+    - LZ4 source repository : https://github.com/lz4/lz4
 */
-#pragma once
+#ifndef LZ4_H_2983827168210
+#define LZ4_H_2983827168210
 
 #if defined (__cplusplus)
 extern "C" {
 #endif
 
+/* --- Dependency --- */
+#include <stddef.h>   /* size_t */
+
+
+/**
+  Introduction
+
+  LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core,
+  scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
+  multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
+
+  The LZ4 compression library provides in-memory compression and decompression functions.
+  Compression can be done in:
+    - a single step (described as Simple Functions)
+    - a single step, reusing a context (described in Advanced Functions)
+    - unbounded multiple steps (described as Streaming compression)
+
+  lz4.h provides block compression functions. It gives full buffer control to user.
+  Decompressing an lz4-compressed block also requires metadata (such as compressed size).
+  Each application is free to encode such metadata in whichever way it wants.
+
+  An additional format, called LZ4 frame specification (doc/lz4_Frame_format.md),
+  take care of encoding standard metadata alongside LZ4-compressed blocks.
+  If your application requires interoperability, it's recommended to use it.
+  A library is provided to take care of it, see lz4frame.h.
+*/
+
+/*^***************************************************************
+*  Export parameters
+*****************************************************************/
 /*
- * lz4.h provides block compression functions, and gives full buffer control to programmer.
- * If you need to generate inter-operable compressed data (respecting LZ4 frame specification),
- * and can let the library handle its own memory, please use lz4frame.h instead.
+*  LZ4_DLL_EXPORT :
+*  Enable exporting of functions when building a Windows DLL
 */
+#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
+#  define LZ4LIB_API __declspec(dllexport)
+#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
+#  define LZ4LIB_API __declspec(dllimport) /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
+#else
+#  define LZ4LIB_API
+#endif
 
-/**************************************
-*  Version
-**************************************/
+
+/*========== Version =========== */
 #define LZ4_VERSION_MAJOR    1    /* for breaking interface changes  */
 #define LZ4_VERSION_MINOR    7    /* for new (non-breaking) interface capabilities */
-#define LZ4_VERSION_RELEASE  1    /* for tweaks, bug-fixes, or development */
+#define LZ4_VERSION_RELEASE  5    /* for tweaks, bug-fixes, or development */
+
 #define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
-int LZ4_versionNumber (void);
 
-/**************************************
+#define LZ4_LIB_VERSION LZ4_VERSION_MAJOR.LZ4_VERSION_MINOR.LZ4_VERSION_RELEASE
+#define LZ4_QUOTE(str) #str
+#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
+#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
+
+LZ4LIB_API int LZ4_versionNumber (void);
+LZ4LIB_API const char* LZ4_versionString (void);
+
+
+/*-************************************
 *  Tuning parameter
 **************************************/
-/*
+/*!
  * LZ4_MEMORY_USAGE :
  * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
  * Increasing memory usage improves compression ratio
@@ -66,15 +111,10 @@ int LZ4_versionNumber (void);
 #define LZ4_MEMORY_USAGE 14
 
 
-/**************************************
+/*-************************************
 *  Simple Functions
 **************************************/
-
-int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
-int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
-
-/*
-LZ4_compress_default() :
+/*! LZ4_compress_default() :
     Compresses 'sourceSize' bytes from buffer 'source'
     into already allocated 'dest' buffer of size 'maxDestSize'.
     Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
@@ -86,9 +126,10 @@ LZ4_compress_default() :
         sourceSize  : Max supported value is LZ4_MAX_INPUT_VALUE
         maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
         return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
-              or 0 if compression fails
+              or 0 if compression fails */
+LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
 
-LZ4_decompress_safe() :
+/*! LZ4_decompress_safe() :
     compressedSize : is the precise full size of the compressed block.
     maxDecompressedSize : is the size of destination buffer, which must be already allocated.
     return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
@@ -97,15 +138,16 @@ LZ4_decompress_safe() :
              This function is protected against buffer overflow exploits, including malicious data packets.
              It never writes outside output buffer, nor reads outside input buffer.
 */
+LZ4LIB_API int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
 
 
-/**************************************
+/*-************************************
 *  Advanced Functions
 **************************************/
 #define LZ4_MAX_INPUT_SIZE        0x7E000000   /* 2 113 929 216 bytes */
 #define LZ4_COMPRESSBOUND(isize)  ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
 
-/*
+/*!
 LZ4_compressBound() :
     Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
     This function is primarily useful for memory allocation purposes (destination buffer size).
@@ -115,9 +157,9 @@ LZ4_compressBound() :
         return : maximum output size in a "worst case" scenario
               or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
 */
-int LZ4_compressBound(int inputSize);
+LZ4LIB_API int LZ4_compressBound(int inputSize);
 
-/*
+/*!
 LZ4_compress_fast() :
     Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
     The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
@@ -125,21 +167,21 @@ LZ4_compress_fast() :
     An acceleration value of "1" is the same as regular LZ4_compress_default()
     Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
 */
-int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
+LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
 
 
-/*
+/*!
 LZ4_compress_fast_extState() :
     Same compression function, just using an externally allocated memory space to store compression state.
     Use LZ4_sizeofState() to know how much memory must be allocated,
     and allocate it on 8-bytes boundaries (using malloc() typically).
     Then, provide it as 'void* state' to compression function.
 */
-int LZ4_sizeofState(void);
-int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
+LZ4LIB_API int LZ4_sizeofState(void);
+LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
 
 
-/*
+/*!
 LZ4_compress_destSize() :
     Reverse the logic, by compressing as much data as possible from 'source' buffer
     into already allocated buffer 'dest' of size 'targetDestSize'.
@@ -150,10 +192,10 @@ LZ4_compress_destSize() :
         return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
               or 0 if compression fails
 */
-int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
+LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
 
 
-/*
+/*!
 LZ4_decompress_fast() :
     originalSize : is the original and therefore uncompressed size
     return : the number of bytes read from the source buffer (in other words, the compressed size)
@@ -164,9 +206,9 @@ LZ4_decompress_fast() :
            However, it does not provide any protection against intentionally modified data stream (malicious input).
            Use this function in trusted environment only (data to decode comes from a trusted source).
 */
-int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
+LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
 
-/*
+/*!
 LZ4_decompress_safe_partial() :
     This function decompress a compressed block of size 'compressedSize' at position 'source'
     into destination buffer 'dest' of size 'maxDecompressedSize'.
@@ -178,98 +220,73 @@ LZ4_decompress_safe_partial() :
              If the source stream is detected malformed, the function will stop decoding and return a negative result.
              This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets
 */
-int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
 
 
-/***********************************************
+/*-*********************************************
 *  Streaming Compression Functions
 ***********************************************/
-#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
-#define LZ4_STREAMSIZE     (LZ4_STREAMSIZE_U64 * sizeof(long long))
-/*
- * LZ4_stream_t
- * information structure to track an LZ4 stream.
- * important : init this structure content before first use !
- * note : only allocated directly the structure if you are statically linking LZ4
- *        If you are using liblz4 as a DLL, please use below construction methods instead.
- */
-typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
+typedef union LZ4_stream_u LZ4_stream_t;   /* incomplete type (defined later) */
 
-/*
- * LZ4_resetStream
- * Use this function to init an allocated LZ4_stream_t structure
+/*! LZ4_createStream() and LZ4_freeStream() :
+ *  LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
+ *  LZ4_freeStream() releases its memory.
  */
-void LZ4_resetStream (LZ4_stream_t* streamPtr);
+LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
+LZ4LIB_API int           LZ4_freeStream (LZ4_stream_t* streamPtr);
 
-/*
- * LZ4_createStream will allocate and initialize an LZ4_stream_t structure
- * LZ4_freeStream releases its memory.
- * In the context of a DLL (liblz4), please use these methods rather than the static struct.
- * They are more future proof, in case of a change of LZ4_stream_t size.
+/*! LZ4_resetStream() :
+ *  An LZ4_stream_t structure can be allocated once and re-used multiple times.
+ *  Use this function to init an allocated `LZ4_stream_t` structure and start a new compression.
  */
-LZ4_stream_t* LZ4_createStream(void);
-int           LZ4_freeStream (LZ4_stream_t* streamPtr);
+LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
 
-/*
- * LZ4_loadDict
- * Use this function to load a static dictionary into LZ4_stream.
- * Any previous data will be forgotten, only 'dictionary' will remain in memory.
- * Loading a size of 0 is allowed.
- * Return : dictionary size, in bytes (necessarily <= 64 KB)
+/*! LZ4_loadDict() :
+ *  Use this function to load a static dictionary into LZ4_stream.
+ *  Any previous data will be forgotten, only 'dictionary' will remain in memory.
+ *  Loading a size of 0 is allowed.
+ *  Return : dictionary size, in bytes (necessarily <= 64 KB)
  */
-int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
-
-/*
- * LZ4_compress_fast_continue
- * Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
- * Important : Previous data blocks are assumed to still be present and unmodified !
- * 'dst' buffer must be already allocated.
- * If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
- * If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
+LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
+
+/*! LZ4_compress_fast_continue() :
+ *  Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
+ *  Important : Previous data blocks are assumed to still be present and unmodified !
+ *  'dst' buffer must be already allocated.
+ *  If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
+ *  If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
  */
-int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
-
-/*
- * LZ4_saveDict
- * If previously compressed data block is not guaranteed to remain available at its memory location
- * save it into a safer place (char* safeBuffer)
- * Note : you don't need to call LZ4_loadDict() afterwards,
- *        dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue()
- * Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error
+LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
+
+/*! LZ4_saveDict() :
+ *  If previously compressed data block is not guaranteed to remain available at its memory location,
+ *  save it into a safer place (char* safeBuffer).
+ *  Note : you don't need to call LZ4_loadDict() afterwards,
+ *         dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue().
+ *  Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
  */
-int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
+LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
 
 
-/************************************************
+/*-**********************************************
 *  Streaming Decompression Functions
+*  Bufferless synchronous API
 ************************************************/
+typedef union LZ4_streamDecode_u LZ4_streamDecode_t;   /* incomplete type (defined later) */
 
-#define LZ4_STREAMDECODESIZE_U64  4
-#define LZ4_STREAMDECODESIZE     (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
-typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
-/*
- * LZ4_streamDecode_t
- * information structure to track an LZ4 stream.
- * init this structure content using LZ4_setStreamDecode or memset() before first use !
- *
- * In the context of a DLL (liblz4) please prefer usage of construction methods below.
- * They are more future proof, in case of a change of LZ4_streamDecode_t size in the future.
- * LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
- * LZ4_freeStreamDecode releases its memory.
- */
-LZ4_streamDecode_t* LZ4_createStreamDecode(void);
-int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
+/* creation / destruction of streaming decompression tracking structure */
+LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
+LZ4LIB_API int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
 
-/*
- * LZ4_setStreamDecode
- * Use this function to instruct where to find the dictionary.
- * Setting a size of 0 is allowed (same effect as reset).
- * Return : 1 if OK, 0 if error
+/*! LZ4_setStreamDecode() :
+ *  Use this function to instruct where to find the dictionary.
+ *  Setting a size of 0 is allowed (same effect as reset).
+ *  @return : 1 if OK, 0 if error
  */
-int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
+LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
 
-/*
-*_continue() :
+/*!
+LZ4_decompress_*_continue() :
     These decoding functions allow decompression of multiple blocks in "streaming" mode.
     Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
     In the case of a ring buffers, decoding buffer must be either :
@@ -285,35 +302,120 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
     Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
     and indicate where it is saved using LZ4_setStreamDecode()
 */
-int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
-int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
+LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
 
 
-/*
-Advanced decoding functions :
-*_usingDict() :
-    These decoding functions work the same as
-    a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
-    They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
-*/
-int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
-int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
+/*! LZ4_decompress_*_usingDict() :
+ *  These decoding functions work the same as
+ *  a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
+ *  They are stand-alone, and don't need an LZ4_streamDecode_t structure.
+ */
+LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
+LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
+
+
+/*^**********************************************
+ * !!!!!!   STATIC LINKING ONLY   !!!!!!
+ ***********************************************/
+/*-************************************
+ *  Private definitions
+ **************************************
+ * Do not use these definitions.
+ * They are exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
+ * Using these definitions will expose code to API and/or ABI break in future versions of the library.
+ **************************************/
+#define LZ4_HASHLOG   (LZ4_MEMORY_USAGE-2)
+#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
+#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG)       /* required as macro for static allocation */
+
+#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+#include <stdint.h>
+
+typedef struct {
+    uint32_t hashTable[LZ4_HASH_SIZE_U32];
+    uint32_t currentOffset;
+    uint32_t initCheck;
+    const uint8_t* dictionary;
+    uint8_t* bufferStart;   /* obsolete, used for slideInputBuffer */
+    uint32_t dictSize;
+} LZ4_stream_t_internal;
+
+typedef struct {
+    const uint8_t* externalDict;
+    size_t extDictSize;
+    const uint8_t* prefixEnd;
+    size_t prefixSize;
+} LZ4_streamDecode_t_internal;
+
+#else
+
+typedef struct {
+    unsigned int hashTable[LZ4_HASH_SIZE_U32];
+    unsigned int currentOffset;
+    unsigned int initCheck;
+    const unsigned char* dictionary;
+    unsigned char* bufferStart;   /* obsolete, used for slideInputBuffer */
+    unsigned int dictSize;
+} LZ4_stream_t_internal;
+
+typedef struct {
+    const unsigned char* externalDict;
+    size_t extDictSize;
+    const unsigned char* prefixEnd;
+    size_t prefixSize;
+} LZ4_streamDecode_t_internal;
+
+#endif
 
+/*!
+ * LZ4_stream_t :
+ * information structure to track an LZ4 stream.
+ * init this structure before first use.
+ * note : only use in association with static linking !
+ *        this definition is not API/ABI safe,
+ *        and may change in a future version !
+ */
+#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
+#define LZ4_STREAMSIZE     (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
+union LZ4_stream_u {
+    unsigned long long table[LZ4_STREAMSIZE_U64];
+    LZ4_stream_t_internal internal_donotuse;
+} ;  /* previously typedef'd to LZ4_stream_t */
+
+
+/*!
+ * LZ4_streamDecode_t :
+ * information structure to track an LZ4 stream during decompression.
+ * init this structure  using LZ4_setStreamDecode (or memset()) before first use
+ * note : only use in association with static linking !
+ *        this definition is not API/ABI safe,
+ *        and may change in a future version !
+ */
+#define LZ4_STREAMDECODESIZE_U64  4
+#define LZ4_STREAMDECODESIZE     (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
+union LZ4_streamDecode_u {
+    unsigned long long table[LZ4_STREAMDECODESIZE_U64];
+    LZ4_streamDecode_t_internal internal_donotuse;
+} ;   /* previously typedef'd to LZ4_streamDecode_t */
 
 
-/**************************************
+/*=************************************
 *  Obsolete Functions
 **************************************/
-/* Deprecate Warnings */
-/* Should these warnings messages be a problem,
+/* Deprecation warnings */
+/* Should these warnings be a problem,
    it is generally possible to disable them,
-   with -Wno-deprecated-declarations for gcc
-   or _CRT_SECURE_NO_WARNINGS in Visual for example.
-   You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
-#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
-#  define LZ4_DEPRECATE_WARNING_DEFBLOCK
+   typically with -Wno-deprecated-declarations for gcc
+   or _CRT_SECURE_NO_WARNINGS in Visual.
+   Otherwise, it's also possible to define LZ4_DISABLE_DEPRECATE_WARNINGS */
+#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
+#  define LZ4_DEPRECATED(message)   /* disable deprecation warnings */
+#else
 #  define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-#  if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
+#  if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
+#    define LZ4_DEPRECATED(message) [[deprecated(message)]]
+#  elif (LZ4_GCC_VERSION >= 405) || defined(__clang__)
 #    define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
 #  elif (LZ4_GCC_VERSION >= 301)
 #    define LZ4_DEPRECATED(message) __attribute__((deprecated))
@@ -323,20 +425,19 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
 #    pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
 #    define LZ4_DEPRECATED(message)
 #  endif
-#endif /* LZ4_DEPRECATE_WARNING_DEFBLOCK */
+#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
 
 /* Obsolete compression functions */
-/* These functions are planned to start generate warnings by r131 approximately */
-int LZ4_compress               (const char* source, char* dest, int sourceSize);
-int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
-int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
-int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
-int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
-int LZ4_compress_limitedOutput_continue  (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress               (const char* source, char* dest, int sourceSize);
+LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_limitedOutput_continue  (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
 
 /* Obsolete decompression functions */
 /* These function names are completely deprecated and must no longer be used.
-   They are only provided here for compatibility with older programs.
+   They are only provided in lz4.c for compatibility with older programs.
     - LZ4_uncompress is the same as LZ4_decompress_fast
     - LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
    These function prototypes are now disabled; uncomment them only if you really need them.
@@ -358,3 +459,5 @@ LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress
 #if defined (__cplusplus)
 }
 #endif
+
+#endif /* LZ4_H_2983827168210 */

Source/ThirdParty/LZ4/lz4hc.c

@@ -1,6 +1,6 @@
 /*
     LZ4 HC - High Compression Mode of LZ4
-    Copyright (C) 2011-2015, Yann Collet.
+    Copyright (C) 2011-2016, Yann Collet.
 
     BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
 
@@ -28,27 +28,36 @@
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
     You can contact the author at :
-       - LZ4 source repository : https://github.com/Cyan4973/lz4
+       - LZ4 source repository : https://github.com/lz4/lz4
        - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
 */
+/* note : lz4hc is not an independent module, it requires lz4.h/lz4.c for proper compilation */
 
 
-
-/**************************************
+/* *************************************
 *  Tuning Parameter
-**************************************/
-static const int LZ4HC_compressionLevel_default = 9;
+***************************************/
+
+/*!
+ * HEAPMODE :
+ * Select how default compression function will allocate workplace memory,
+ * in stack (0:fastest), or in heap (1:requires malloc()).
+ * Since workplace is rather large, heap mode is recommended.
+ */
+#ifndef LZ4HC_HEAPMODE
+#  define LZ4HC_HEAPMODE 1
+#endif
 
 
-/**************************************
-*  Includes
-**************************************/
+/* *************************************
+*  Dependency
+***************************************/
 #include "lz4hc.h"
 
 
-/**************************************
+/* *************************************
 *  Local Compiler Options
-**************************************/
+***************************************/
 #if defined(__GNUC__)
 #  pragma GCC diagnostic ignored "-Wunused-function"
 #endif
@@ -58,52 +67,24 @@ static const int LZ4HC_compressionLevel_default = 9;
 #endif
 
 
-/**************************************
+/* *************************************
 *  Common LZ4 definition
-**************************************/
+***************************************/
 #define LZ4_COMMONDEFS_ONLY
 #include "lz4.c"
 
 
-/**************************************
+/* *************************************
 *  Local Constants
-**************************************/
-#define DICTIONARY_LOGSIZE 16
-#define MAXD (1<<DICTIONARY_LOGSIZE)
-#define MAXD_MASK (MAXD - 1)
-
-#define HASH_LOG (DICTIONARY_LOGSIZE-1)
-#define HASHTABLESIZE (1 << HASH_LOG)
-#define HASH_MASK (HASHTABLESIZE - 1)
-
+***************************************/
 #define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
 
-static const int g_maxCompressionLevel = 16;
-
-
-/**************************************
-*  Local Types
-**************************************/
-typedef struct
-{
-    U32   hashTable[HASHTABLESIZE];
-    U16   chainTable[MAXD];
-    const BYTE* end;        /* next block here to continue on current prefix */
-    const BYTE* base;       /* All index relative to this position */
-    const BYTE* dictBase;   /* alternate base for extDict */
-    BYTE* inputBuffer;      /* deprecated */
-    U32   dictLimit;        /* below that point, need extDict */
-    U32   lowLimit;         /* below that point, no more dict */
-    U32   nextToUpdate;     /* index from which to continue dictionary update */
-    U32   compressionLevel;
-} LZ4HC_Data_Structure;
-
 
 /**************************************
 *  Local Macros
 **************************************/
-#define HASH_FUNCTION(i)       (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
-//#define DELTANEXTU16(p)        chainTable[(p) & MAXD_MASK]   /* flexible, MAXD dependent */
+#define HASH_FUNCTION(i)       (((i) * 2654435761U) >> ((MINMATCH*8)-LZ4HC_HASH_LOG))
+#define DELTANEXTMAXD(p)       chainTable[(p) & LZ4HC_MAXD_MASK]    /* flexible, LZ4HC_MAXD dependent */
 #define DELTANEXTU16(p)        chainTable[(U16)(p)]   /* faster */
 
 static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
@@ -113,7 +94,7 @@ static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)
 /**************************************
 *  HC Compression
 **************************************/
-static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
+static void LZ4HC_init (LZ4HC_CCtx_internal* hc4, const BYTE* start)
 {
     MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable));
     MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
@@ -127,21 +108,20 @@ static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
 
 
 /* Update chains up to ip (excluded) */
-FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
+FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
 {
-    U16* chainTable = hc4->chainTable;
-    U32* HashTable  = hc4->hashTable;
+    U16* const chainTable = hc4->chainTable;
+    U32* const hashTable  = hc4->hashTable;
     const BYTE* const base = hc4->base;
-    const U32 target = (U32)(ip - base);
+    U32 const target = (U32)(ip - base);
     U32 idx = hc4->nextToUpdate;
 
-    while(idx < target)
-    {
-        U32 h = LZ4HC_hashPtr(base+idx);
-        size_t delta = idx - HashTable[h];
+    while (idx < target) {
+        U32 const h = LZ4HC_hashPtr(base+idx);
+        size_t delta = idx - hashTable[h];
         if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
         DELTANEXTU16(idx) = (U16)delta;
-        HashTable[h] = idx;
+        hashTable[h] = idx;
         idx++;
     }
 
@@ -149,7 +129,7 @@ FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
 }
 
 
-FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4,   /* Index table will be updated */
+FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_CCtx_internal* hc4,   /* Index table will be updated */
                                                const BYTE* ip, const BYTE* const iLimit,
                                                const BYTE** matchpos,
                                                const int maxNbAttempts)
@@ -161,7 +141,6 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4,   /* I
     const U32 dictLimit = hc4->dictLimit;
     const U32 lowLimit = (hc4->lowLimit + 64 KB > (U32)(ip-base)) ? hc4->lowLimit : (U32)(ip - base) - (64 KB - 1);
     U32 matchIndex;
-    const BYTE* match;
     int nbAttempts=maxNbAttempts;
     size_t ml=0;
 
@@ -169,24 +148,19 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4,   /* I
     LZ4HC_Insert(hc4, ip);
     matchIndex = HashTable[LZ4HC_hashPtr(ip)];
 
-    while ((matchIndex>=lowLimit) && (nbAttempts))
-    {
+    while ((matchIndex>=lowLimit) && (nbAttempts)) {
         nbAttempts--;
-        if (matchIndex >= dictLimit)
-        {
-            match = base + matchIndex;
+        if (matchIndex >= dictLimit) {
+            const BYTE* const match = base + matchIndex;
             if (*(match+ml) == *(ip+ml)
                 && (LZ4_read32(match) == LZ4_read32(ip)))
             {
-                size_t mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, iLimit) + MINMATCH;
+                size_t const mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, iLimit) + MINMATCH;
                 if (mlt > ml) { ml = mlt; *matchpos = match; }
             }
-        }
-        else
-        {
-            match = dictBase + matchIndex;
-            if (LZ4_read32(match) == LZ4_read32(ip))
-            {
+        } else {
+            const BYTE* const match = dictBase + matchIndex;
+            if (LZ4_read32(match) == LZ4_read32(ip)) {
                 size_t mlt;
                 const BYTE* vLimit = ip + (dictLimit - matchIndex);
                 if (vLimit > iLimit) vLimit = iLimit;
@@ -204,7 +178,7 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4,   /* I
 
 
 FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
-    LZ4HC_Data_Structure* hc4,
+    LZ4HC_CCtx_internal* hc4,
     const BYTE* const ip,
     const BYTE* const iLowLimit,
     const BYTE* const iHighLimit,
@@ -229,38 +203,32 @@ FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
     LZ4HC_Insert(hc4, ip);
     matchIndex = HashTable[LZ4HC_hashPtr(ip)];
 
-    while ((matchIndex>=lowLimit) && (nbAttempts))
-    {
+    while ((matchIndex>=lowLimit) && (nbAttempts)) {
         nbAttempts--;
-        if (matchIndex >= dictLimit)
-        {
+        if (matchIndex >= dictLimit) {
             const BYTE* matchPtr = base + matchIndex;
-            if (*(iLowLimit + longest) == *(matchPtr - delta + longest))
-                if (LZ4_read32(matchPtr) == LZ4_read32(ip))
-                {
+            if (*(iLowLimit + longest) == *(matchPtr - delta + longest)) {
+                if (LZ4_read32(matchPtr) == LZ4_read32(ip)) {
                     int mlt = MINMATCH + LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, iHighLimit);
                     int back = 0;
 
-                    while ((ip+back>iLowLimit)
+                    while ((ip+back > iLowLimit)
                            && (matchPtr+back > lowPrefixPtr)
                            && (ip[back-1] == matchPtr[back-1]))
                             back--;
 
                     mlt -= back;
 
-                    if (mlt > longest)
-                    {
+                    if (mlt > longest) {
                         longest = (int)mlt;
                         *matchpos = matchPtr+back;
                         *startpos = ip+back;
                     }
                 }
-        }
-        else
-        {
-            const BYTE* matchPtr = dictBase + matchIndex;
-            if (LZ4_read32(matchPtr) == LZ4_read32(ip))
-            {
+            }
+        } else {
+            const BYTE* const matchPtr = dictBase + matchIndex;
+            if (LZ4_read32(matchPtr) == LZ4_read32(ip)) {
                 size_t mlt;
                 int back=0;
                 const BYTE* vLimit = ip + (dictLimit - matchIndex);
@@ -320,8 +288,15 @@ FORCE_INLINE int LZ4HC_encodeSequence (
     /* Encode MatchLength */
     length = (int)(matchLength-MINMATCH);
     if ((limitedOutputBuffer) && (*op + (length>>8) + (1 + LASTLITERALS) > oend)) return 1;   /* Check output limit */
-    if (length>=(int)ML_MASK) { *token+=ML_MASK; length-=ML_MASK; for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; } if (length > 254) { length-=255; *(*op)++ = 255; } *(*op)++ = (BYTE)length; }
-    else *token += (BYTE)(length);
+    if (length>=(int)ML_MASK) {
+        *token += ML_MASK;
+        length -= ML_MASK;
+        for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; }
+        if (length > 254) { length-=255; *(*op)++ = 255; }
+        *(*op)++ = (BYTE)length;
+    } else {
+        *token += (BYTE)(length);
+    }
 
     /* Prepare next loop */
     *ip += matchLength;
@@ -330,18 +305,18 @@ FORCE_INLINE int LZ4HC_encodeSequence (
     return 0;
 }
 
+#include "lz4opt.h"
 
-static int LZ4HC_compress_generic (
-    void* ctxvoid,
-    const char* source,
-    char* dest,
-    int inputSize,
-    int maxOutputSize,
-    int compressionLevel,
+static int LZ4HC_compress_hashChain (
+    LZ4HC_CCtx_internal* const ctx,
+    const char* const source,
+    char* const dest,
+    int const inputSize,
+    int const maxOutputSize,
+    unsigned maxNbAttempts,
     limitedOutput_directive limit
     )
 {
-    LZ4HC_Data_Structure* ctx = (LZ4HC_Data_Structure*) ctxvoid;
     const BYTE* ip = (const BYTE*) source;
     const BYTE* anchor = ip;
     const BYTE* const iend = ip + inputSize;
@@ -351,28 +326,22 @@ static int LZ4HC_compress_generic (
     BYTE* op = (BYTE*) dest;
     BYTE* const oend = op + maxOutputSize;
 
-    unsigned maxNbAttempts;
     int   ml, ml2, ml3, ml0;
-    const BYTE* ref=NULL;
-    const BYTE* start2=NULL;
-    const BYTE* ref2=NULL;
-    const BYTE* start3=NULL;
-    const BYTE* ref3=NULL;
+    const BYTE* ref = NULL;
+    const BYTE* start2 = NULL;
+    const BYTE* ref2 = NULL;
+    const BYTE* start3 = NULL;
+    const BYTE* ref3 = NULL;
     const BYTE* start0;
     const BYTE* ref0;
 
-
     /* init */
-    if (compressionLevel > g_maxCompressionLevel) compressionLevel = g_maxCompressionLevel;
-    if (compressionLevel < 1) compressionLevel = LZ4HC_compressionLevel_default;
-    maxNbAttempts = 1 << (compressionLevel-1);
     ctx->end += inputSize;
 
     ip++;
 
     /* Main Loop */
-    while (ip < mflimit)
-    {
+    while (ip < mflimit) {
         ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref), maxNbAttempts);
         if (!ml) { ip++; continue; }
 
@@ -383,19 +352,16 @@ static int LZ4HC_compress_generic (
 
 _Search2:
         if (ip+ml < mflimit)
-            ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 1, matchlimit, ml, &ref2, &start2, maxNbAttempts);
+            ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 0, matchlimit, ml, &ref2, &start2, maxNbAttempts);
         else ml2 = ml;
 
-        if (ml2 == ml)  /* No better match */
-        {
+        if (ml2 == ml) { /* No better match */
             if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
             continue;
         }
 
-        if (start0 < ip)
-        {
-            if (start2 < ip + ml0)   /* empirical */
-            {
+        if (start0 < ip) {
+            if (start2 < ip + ml0) {  /* empirical */
                 ip = start0;
                 ref = ref0;
                 ml = ml0;
@@ -403,8 +369,7 @@ _Search2:
         }
 
         /* Here, start0==ip */
-        if ((start2 - ip) < 3)   /* First Match too small : removed */
-        {
+        if ((start2 - ip) < 3) {  /* First Match too small : removed */
             ml = ml2;
             ip = start2;
             ref =ref2;
@@ -417,15 +382,13 @@ _Search3:
         * ml2 > ml1, and
         * ip1+3 <= ip2 (usually < ip1+ml1)
         */
-        if ((start2 - ip) < OPTIMAL_ML)
-        {
+        if ((start2 - ip) < OPTIMAL_ML) {
             int correction;
             int new_ml = ml;
             if (new_ml > OPTIMAL_ML) new_ml = OPTIMAL_ML;
             if (ip+new_ml > start2 + ml2 - MINMATCH) new_ml = (int)(start2 - ip) + ml2 - MINMATCH;
             correction = new_ml - (int)(start2 - ip);
-            if (correction > 0)
-            {
+            if (correction > 0) {
                 start2 += correction;
                 ref2 += correction;
                 ml2 -= correction;
@@ -437,8 +400,7 @@ _Search3:
             ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3, maxNbAttempts);
         else ml3 = ml2;
 
-        if (ml3 == ml2) /* No better match : 2 sequences to encode */
-        {
+        if (ml3 == ml2) {  /* No better match : 2 sequences to encode */
             /* ip & ref are known; Now for ml */
             if (start2 < ip+ml)  ml = (int)(start2 - ip);
             /* Now, encode 2 sequences */
@@ -448,18 +410,14 @@ _Search3:
             continue;
         }
 
-        if (start3 < ip+ml+3) /* Not enough space for match 2 : remove it */
-        {
-            if (start3 >= (ip+ml)) /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
-            {
-                if (start2 < ip+ml)
-                {
+        if (start3 < ip+ml+3) {  /* Not enough space for match 2 : remove it */
+            if (start3 >= (ip+ml)) {  /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
+                if (start2 < ip+ml) {
                     int correction = (int)(ip+ml - start2);
                     start2 += correction;
                     ref2 += correction;
                     ml2 -= correction;
-                    if (ml2 < MINMATCH)
-                    {
+                    if (ml2 < MINMATCH) {
                         start2 = start3;
                         ref2 = ref3;
                         ml2 = ml3;
@@ -487,23 +445,18 @@ _Search3:
         * OK, now we have 3 ascending matches; let's write at least the first one
         * ip & ref are known; Now for ml
         */
-        if (start2 < ip+ml)
-        {
-            if ((start2 - ip) < (int)ML_MASK)
-            {
+        if (start2 < ip+ml) {
+            if ((start2 - ip) < (int)ML_MASK) {
                 int correction;
                 if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
                 if (ip + ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH;
                 correction = ml - (int)(start2 - ip);
-                if (correction > 0)
-                {
+                if (correction > 0) {
                     start2 += correction;
                     ref2 += correction;
                     ml2 -= correction;
                 }
-            }
-            else
-            {
+            } else {
                 ml = (int)(start2 - ip);
             }
         }
@@ -521,8 +474,7 @@ _Search3:
     }
 
     /* Encode Last Literals */
-    {
-        int lastRun = (int)(iend - anchor);
+    {   int lastRun = (int)(iend - anchor);
         if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0;  /* Check output limit */
         if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
         else *op++ = (BYTE)(lastRun<<ML_BITS);
@@ -534,23 +486,64 @@ _Search3:
     return (int) (((char*)op)-dest);
 }
 
+static int LZ4HC_getSearchNum(int compressionLevel)
+{
+    switch (compressionLevel) {
+        default: return 0; /* unused */
+        case 11: return 128; 
+        case 12: return 1<<10; 
+    }
+}
 
-int LZ4_sizeofStateHC(void) { return sizeof(LZ4HC_Data_Structure); }
+static int LZ4HC_compress_generic (
+    LZ4HC_CCtx_internal* const ctx,
+    const char* const source,
+    char* const dest,
+    int const inputSize,
+    int const maxOutputSize,
+    int compressionLevel,
+    limitedOutput_directive limit
+    )
+{
+    if (compressionLevel < 1) compressionLevel = LZ4HC_CLEVEL_DEFAULT;
+    if (compressionLevel > 9) {
+        switch (compressionLevel) {
+            case 10: return LZ4HC_compress_hashChain(ctx, source, dest, inputSize, maxOutputSize, 1 << (16-1), limit);
+            case 11: ctx->searchNum = LZ4HC_getSearchNum(compressionLevel); return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, 128, 0);
+            default:
+            case 12: ctx->searchNum = LZ4HC_getSearchNum(compressionLevel); return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, LZ4_OPT_NUM, 1);
+        }
+    }
+    return LZ4HC_compress_hashChain(ctx, source, dest, inputSize, maxOutputSize, 1 << (compressionLevel-1), limit);
+}
+
+
+int LZ4_sizeofStateHC(void) { return sizeof(LZ4_streamHC_t); }
 
 int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
 {
+    LZ4HC_CCtx_internal* ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
     if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
-    LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)src);
+    LZ4HC_init (ctx, (const BYTE*)src);
     if (maxDstSize < LZ4_compressBound(srcSize))
-        return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
+        return LZ4HC_compress_generic (ctx, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
     else
-        return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, noLimit);
+        return LZ4HC_compress_generic (ctx, src, dst, srcSize, maxDstSize, compressionLevel, noLimit);
 }
 
 int LZ4_compress_HC(const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
 {
-    LZ4HC_Data_Structure state;
-    return LZ4_compress_HC_extStateHC(&state, src, dst, srcSize, maxDstSize, compressionLevel);
+#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
+    LZ4_streamHC_t* const statePtr = (LZ4_streamHC_t*)malloc(sizeof(LZ4_streamHC_t));
+#else
+    LZ4_streamHC_t state;
+    LZ4_streamHC_t* const statePtr = &state;
+#endif
+    int const cSize = LZ4_compress_HC_extStateHC(statePtr, src, dst, srcSize, maxDstSize, compressionLevel);
+#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
+    free(statePtr);
+#endif
+    return cSize;
 }
 
 
@@ -566,32 +559,38 @@ int             LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_st
 /* initialization */
 void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
 {
-    LZ4_STATIC_ASSERT(sizeof(LZ4HC_Data_Structure) <= sizeof(LZ4_streamHC_t));   /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
-    ((LZ4HC_Data_Structure*)LZ4_streamHCPtr)->base = NULL;
-    ((LZ4HC_Data_Structure*)LZ4_streamHCPtr)->compressionLevel = (unsigned)compressionLevel;
+    LZ4_STATIC_ASSERT(sizeof(LZ4HC_CCtx_internal) <= sizeof(size_t) * LZ4_STREAMHCSIZE_SIZET);   /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
+    LZ4_streamHCPtr->internal_donotuse.base = NULL;
+    LZ4_streamHCPtr->internal_donotuse.compressionLevel = (unsigned)compressionLevel;
+    LZ4_streamHCPtr->internal_donotuse.searchNum = LZ4HC_getSearchNum(compressionLevel);
 }
 
 int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, const char* dictionary, int dictSize)
 {
-    LZ4HC_Data_Structure* ctxPtr = (LZ4HC_Data_Structure*) LZ4_streamHCPtr;
-    if (dictSize > 64 KB)
-    {
+    LZ4HC_CCtx_internal* ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
+    if (dictSize > 64 KB) {
         dictionary += dictSize - 64 KB;
         dictSize = 64 KB;
     }
     LZ4HC_init (ctxPtr, (const BYTE*)dictionary);
-    if (dictSize >= 4) LZ4HC_Insert (ctxPtr, (const BYTE*)dictionary +(dictSize-3));
     ctxPtr->end = (const BYTE*)dictionary + dictSize;
+    if (ctxPtr->compressionLevel >= LZ4HC_CLEVEL_OPT_MIN)
+        LZ4HC_updateBinTree(ctxPtr, ctxPtr->end - MFLIMIT, ctxPtr->end - LASTLITERALS);
+    else
+        if (dictSize >= 4) LZ4HC_Insert (ctxPtr, ctxPtr->end-3);
     return dictSize;
 }
 
 
 /* compression */
 
-static void LZ4HC_setExternalDict(LZ4HC_Data_Structure* ctxPtr, const BYTE* newBlock)
+static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock)
 {
-    if (ctxPtr->end >= ctxPtr->base + 4)
-        LZ4HC_Insert (ctxPtr, ctxPtr->end-3);   /* Referencing remaining dictionary content */
+    if (ctxPtr->compressionLevel >= LZ4HC_CLEVEL_OPT_MIN)
+        LZ4HC_updateBinTree(ctxPtr, ctxPtr->end - MFLIMIT, ctxPtr->end - LASTLITERALS);
+    else
+        if (ctxPtr->end >= ctxPtr->base + 4) LZ4HC_Insert (ctxPtr, ctxPtr->end-3);   /* Referencing remaining dictionary content */
+
     /* Only one memory segment for extDict, so any previous extDict is lost at this stage */
     ctxPtr->lowLimit  = ctxPtr->dictLimit;
     ctxPtr->dictLimit = (U32)(ctxPtr->end - ctxPtr->base);
@@ -601,34 +600,29 @@ static void LZ4HC_setExternalDict(LZ4HC_Data_Structure* ctxPtr, const BYTE* newB
     ctxPtr->nextToUpdate = ctxPtr->dictLimit;   /* match referencing will resume from there */
 }
 
-static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
+static int LZ4_compressHC_continue_generic (LZ4_streamHC_t* LZ4_streamHCPtr,
                                             const char* source, char* dest,
                                             int inputSize, int maxOutputSize, limitedOutput_directive limit)
 {
+    LZ4HC_CCtx_internal* ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
     /* auto-init if forgotten */
-    if (ctxPtr->base == NULL)
-        LZ4HC_init (ctxPtr, (const BYTE*) source);
+    if (ctxPtr->base == NULL) LZ4HC_init (ctxPtr, (const BYTE*) source);
 
     /* Check overflow */
-    if ((size_t)(ctxPtr->end - ctxPtr->base) > 2 GB)
-    {
+    if ((size_t)(ctxPtr->end - ctxPtr->base) > 2 GB) {
         size_t dictSize = (size_t)(ctxPtr->end - ctxPtr->base) - ctxPtr->dictLimit;
         if (dictSize > 64 KB) dictSize = 64 KB;
-
-        LZ4_loadDictHC((LZ4_streamHC_t*)ctxPtr, (const char*)(ctxPtr->end) - dictSize, (int)dictSize);
+        LZ4_loadDictHC(LZ4_streamHCPtr, (const char*)(ctxPtr->end) - dictSize, (int)dictSize);
     }
 
     /* Check if blocks follow each other */
-    if ((const BYTE*)source != ctxPtr->end)
-        LZ4HC_setExternalDict(ctxPtr, (const BYTE*)source);
+    if ((const BYTE*)source != ctxPtr->end) LZ4HC_setExternalDict(ctxPtr, (const BYTE*)source);
 
     /* Check overlapping input/dictionary space */
-    {
-        const BYTE* sourceEnd = (const BYTE*) source + inputSize;
-        const BYTE* dictBegin = ctxPtr->dictBase + ctxPtr->lowLimit;
-        const BYTE* dictEnd   = ctxPtr->dictBase + ctxPtr->dictLimit;
-        if ((sourceEnd > dictBegin) && ((const BYTE*)source < dictEnd))
-        {
+    {   const BYTE* sourceEnd = (const BYTE*) source + inputSize;
+        const BYTE* const dictBegin = ctxPtr->dictBase + ctxPtr->lowLimit;
+        const BYTE* const dictEnd   = ctxPtr->dictBase + ctxPtr->dictLimit;
+        if ((sourceEnd > dictBegin) && ((const BYTE*)source < dictEnd)) {
             if (sourceEnd > dictEnd) sourceEnd = dictEnd;
             ctxPtr->lowLimit = (U32)(sourceEnd - ctxPtr->dictBase);
             if (ctxPtr->dictLimit - ctxPtr->lowLimit < 4) ctxPtr->lowLimit = ctxPtr->dictLimit;
@@ -641,9 +635,9 @@ static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
 int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
 {
     if (maxOutputSize < LZ4_compressBound(inputSize))
-        return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
+        return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
     else
-        return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
+        return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
 }
 
 
@@ -651,14 +645,13 @@ int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* sourc
 
 int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictSize)
 {
-    LZ4HC_Data_Structure* streamPtr = (LZ4HC_Data_Structure*)LZ4_streamHCPtr;
-    int prefixSize = (int)(streamPtr->end - (streamPtr->base + streamPtr->dictLimit));
+    LZ4HC_CCtx_internal* const streamPtr = &LZ4_streamHCPtr->internal_donotuse;
+    int const prefixSize = (int)(streamPtr->end - (streamPtr->base + streamPtr->dictLimit));
     if (dictSize > 64 KB) dictSize = 64 KB;
     if (dictSize < 4) dictSize = 0;
     if (dictSize > prefixSize) dictSize = prefixSize;
     memmove(safeBuffer, streamPtr->end - dictSize, dictSize);
-    {
-        U32 endIndex = (U32)(streamPtr->end - streamPtr->base);
+    {   U32 const endIndex = (U32)(streamPtr->end - streamPtr->base);
         streamPtr->end = (const BYTE*)safeBuffer + dictSize;
         streamPtr->base = streamPtr->end - endIndex;
         streamPtr->dictLimit = endIndex - dictSize;
@@ -672,8 +665,8 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
 /***********************************
 *  Deprecated Functions
 ***********************************/
+/* These functions currently generate deprecation warnings */
 /* Deprecated compression functions */
-/* These functions are planned to start generate warnings by r131 approximately */
 int LZ4_compressHC(const char* src, char* dst, int srcSize) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
 int LZ4_compressHC_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, 0); }
 int LZ4_compressHC2(const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
@@ -687,45 +680,41 @@ int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* ctx, const char* src,
 
 
 /* Deprecated streaming functions */
-/* These functions currently generate deprecation warnings */
 int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; }
 
 int LZ4_resetStreamStateHC(void* state, char* inputBuffer)
 {
+    LZ4HC_CCtx_internal *ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
     if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1;   /* Error : pointer is not aligned for pointer (32 or 64 bits) */
-    LZ4HC_init((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer);
-    ((LZ4HC_Data_Structure*)state)->inputBuffer = (BYTE*)inputBuffer;
+    LZ4HC_init(ctx, (const BYTE*)inputBuffer);
+    ctx->inputBuffer = (BYTE*)inputBuffer;
     return 0;
 }
 
 void* LZ4_createHC (char* inputBuffer)
 {
-    void* hc4 = ALLOCATOR(1, sizeof(LZ4HC_Data_Structure));
+    LZ4_streamHC_t* hc4 = (LZ4_streamHC_t*)ALLOCATOR(1, sizeof(LZ4_streamHC_t));
     if (hc4 == NULL) return NULL;   /* not enough memory */
-    LZ4HC_init ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
-    ((LZ4HC_Data_Structure*)hc4)->inputBuffer = (BYTE*)inputBuffer;
+    LZ4HC_init (&hc4->internal_donotuse, (const BYTE*)inputBuffer);
+    hc4->internal_donotuse.inputBuffer = (BYTE*)inputBuffer;
     return hc4;
 }
 
-int LZ4_freeHC (void* LZ4HC_Data)
-{
-    FREEMEM(LZ4HC_Data);
-    return (0);
-}
+int LZ4_freeHC (void* LZ4HC_Data) { FREEMEM(LZ4HC_Data); return 0; }
 
 int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel)
 {
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, compressionLevel, noLimit);
+    return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, source, dest, inputSize, 0, compressionLevel, noLimit);
 }
 
 int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
 {
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
+    return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
 }
 
 char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
 {
-    LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
-    int dictSize = LZ4_saveDictHC((LZ4_streamHC_t*)LZ4HC_Data, (char*)(hc4->inputBuffer), 64 KB);
+    LZ4HC_CCtx_internal* const hc4 = &((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse;
+    int const dictSize = LZ4_saveDictHC((LZ4_streamHC_t*)LZ4HC_Data, (char*)(hc4->inputBuffer), 64 KB);
     return (char*)(hc4->inputBuffer + dictSize);
 }

Source/ThirdParty/LZ4/lz4hc.h

@@ -1,7 +1,7 @@
 /*
    LZ4 HC - High Compression Mode of LZ4
    Header File
-   Copyright (C) 2011-2015, Yann Collet.
+   Copyright (C) 2011-2016, 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
@@ -28,107 +28,92 @@
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
    You can contact the author at :
-   - LZ4 source repository : https://github.com/Cyan4973/lz4
+   - LZ4 source repository : https://github.com/lz4/lz4
    - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
 */
-#pragma once
-
+#ifndef LZ4_HC_H_19834876238432
+#define LZ4_HC_H_19834876238432
 
 #if defined (__cplusplus)
 extern "C" {
 #endif
 
-/*****************************
-*  Includes
-*****************************/
-#include <stddef.h>   /* size_t */
+/* --- Dependency --- */
+/* note : lz4hc is not an independent module, it requires lz4.h/lz4.c for proper compilation */
+#include "lz4.h"   /* stddef, LZ4LIB_API, LZ4_DEPRECATED */
 
 
-/**************************************
-*  Block Compression
-**************************************/
-int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
-/*
-LZ4_compress_HC :
-    Destination buffer 'dst' must be already allocated.
-    Compression completion is guaranteed if 'dst' buffer is sized to handle worst circumstances (data not compressible)
-    Worst size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
-      srcSize  : Max supported value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
-      compressionLevel : Recommended values are between 4 and 9, although any value between 0 and 16 will work.
-                         0 means "use default value" (see lz4hc.c).
-                         Values >16 behave the same as 16.
-      return : the number of bytes written into buffer 'dst'
-            or 0 if compression fails.
-*/
-
-
-/* Note :
-   Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
-*/
+/* --- Useful constants --- */
+#define LZ4HC_CLEVEL_MIN         3
+#define LZ4HC_CLEVEL_DEFAULT     9
+#define LZ4HC_CLEVEL_OPT_MIN    11
+#define LZ4HC_CLEVEL_MAX        12
 
 
-int LZ4_sizeofStateHC(void);
-int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
-/*
-LZ4_compress_HC_extStateHC() :
-   Use this function if you prefer to manually allocate memory for compression tables.
-   To know how much memory must be allocated for the compression tables, use :
-      int LZ4_sizeofStateHC();
+/*-************************************
+ *  Block Compression
+ **************************************/
+/*! LZ4_compress_HC() :
+ * Compress data from `src` into `dst`, using the more powerful but slower "HC" algorithm.
+ * `dst` must be already allocated.
+ * Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
+ * Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
+ * `compressionLevel` : Recommended values are between 4 and 9, although any value between 1 and LZ4HC_MAX_CLEVEL will work.
+ *                      Values >LZ4HC_MAX_CLEVEL behave the same as LZ4HC_MAX_CLEVEL.
+ * @return : the number of bytes written into 'dst'
+ *           or 0 if compression fails.
+ */
+LZ4LIB_API int LZ4_compress_HC (const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel);
 
-   Allocated memory must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
 
-   The allocated memory can then be provided to the compression functions using 'void* state' parameter.
-   LZ4_compress_HC_extStateHC() is equivalent to previously described function.
-   It just uses externally allocated memory for stateHC.
-*/
+/* Note :
+ *   Decompression functions are provided within "lz4.h" (BSD license)
+ */
 
 
-/**************************************
-*  Streaming Compression
-**************************************/
-#define LZ4_STREAMHCSIZE        262192
-#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
-typedef struct { size_t table[LZ4_STREAMHCSIZE_SIZET]; } LZ4_streamHC_t;
-/*
-  LZ4_streamHC_t
-  This structure allows static allocation of LZ4 HC streaming state.
-  State must then be initialized using LZ4_resetStreamHC() before first use.
+/*! LZ4_compress_HC_extStateHC() :
+ * Same as LZ4_compress_HC(), but using an externally allocated memory segment for `state`.
+ * `state` size is provided by LZ4_sizeofStateHC().
+ * Memory segment must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
+ */
+LZ4LIB_API int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
+LZ4LIB_API int LZ4_sizeofStateHC(void);
 
-  Static allocation should only be used in combination with static linking.
-  If you want to use LZ4 as a DLL, please use construction functions below, which are future-proof.
-*/
 
+/*-************************************
+ *  Streaming Compression
+ *  Bufferless synchronous API
+ **************************************/
+ typedef union LZ4_streamHC_u LZ4_streamHC_t;   /* incomplete type (defined later) */
 
-LZ4_streamHC_t* LZ4_createStreamHC(void);
-int             LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
-/*
-  These functions create and release memory for LZ4 HC streaming state.
-  Newly created states are already initialized.
-  Existing state space can be re-used anytime using LZ4_resetStreamHC().
-  If you use LZ4 as a DLL, use these functions instead of static structure allocation,
-  to avoid size mismatch between different versions.
-*/
+/*! LZ4_createStreamHC() and LZ4_freeStreamHC() :
+ * These functions create and release memory for LZ4 HC streaming state.
+ * Newly created states are automatically initialized.
+ * Existing states can be re-used several times, using LZ4_resetStreamHC().
+ * These methods are API and ABI stable, they can be used in combination with a DLL.
+ */
+LZ4LIB_API LZ4_streamHC_t* LZ4_createStreamHC(void);
+LZ4LIB_API int             LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
 
-void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
-int  LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
+LZ4LIB_API void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
+LZ4LIB_API int  LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
 
-int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
+LZ4LIB_API int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
 
-int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
+LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
 
 /*
   These functions compress data in successive blocks of any size, using previous blocks as dictionary.
   One key assumption is that previous blocks (up to 64 KB) remain read-accessible while compressing next blocks.
-  There is an exception for ring buffers, which can be smaller 64 KB.
-  Such case is automatically detected and correctly handled by LZ4_compress_HC_continue().
+  There is an exception for ring buffers, which can be smaller than 64 KB.
+  Ring buffers scenario is automatically detected and handled by LZ4_compress_HC_continue().
 
   Before starting compression, state must be properly initialized, using LZ4_resetStreamHC().
   A first "fictional block" can then be designated as initial dictionary, using LZ4_loadDictHC() (Optional).
 
   Then, use LZ4_compress_HC_continue() to compress each successive block.
-  It works like LZ4_compress_HC(), but use previous memory blocks as dictionary to improve compression.
   Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression.
-  As a reminder, size 'dst' buffer to handle worst cases, using LZ4_compressBound(), to ensure success of compression operation.
+  'dst' buffer should be sized to handle worst case scenarios, using LZ4_compressBound(), to ensure operation success.
 
   If, for any reason, previous data blocks can't be preserved unmodified in memory during next compression block,
   you must save it to a safer memory space, using LZ4_saveDictHC().
@@ -136,50 +121,102 @@ int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSi
 */
 
 
+/*-******************************************
+ * !!!!!   STATIC LINKING ONLY   !!!!!
+ *******************************************/
+
+ /*-*************************************
+ * PRIVATE DEFINITIONS :
+ * Do not use these definitions.
+ * They are exposed to allow static allocation of `LZ4_streamHC_t`.
+ * Using these definitions makes the code vulnerable to potential API break when upgrading LZ4
+ **************************************/
+#define LZ4HC_DICTIONARY_LOGSIZE 17
+#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
+#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
+
+#define LZ4HC_HASH_LOG 15
+#define LZ4HC_HASHTABLESIZE (1 << LZ4HC_HASH_LOG)
+#define LZ4HC_HASH_MASK (LZ4HC_HASHTABLESIZE - 1)
+
+
+#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+#include <stdint.h>
+
+typedef struct
+{
+    uint32_t   hashTable[LZ4HC_HASHTABLESIZE];
+    uint16_t   chainTable[LZ4HC_MAXD];
+    const uint8_t* end;        /* next block here to continue on current prefix */
+    const uint8_t* base;       /* All index relative to this position */
+    const uint8_t* dictBase;   /* alternate base for extDict */
+    uint8_t* inputBuffer;      /* deprecated */
+    uint32_t   dictLimit;        /* below that point, need extDict */
+    uint32_t   lowLimit;         /* below that point, no more dict */
+    uint32_t   nextToUpdate;     /* index from which to continue dictionary update */
+    uint32_t   searchNum;        /* only for optimal parser */
+    uint32_t   compressionLevel;
+} LZ4HC_CCtx_internal;
+
+#else
+
+typedef struct
+{
+    unsigned int   hashTable[LZ4HC_HASHTABLESIZE];
+    unsigned short   chainTable[LZ4HC_MAXD];
+    const unsigned char* end;        /* next block here to continue on current prefix */
+    const unsigned char* base;       /* All index relative to this position */
+    const unsigned char* dictBase;   /* alternate base for extDict */
+    unsigned char* inputBuffer;      /* deprecated */
+    unsigned int   dictLimit;        /* below that point, need extDict */
+    unsigned int   lowLimit;         /* below that point, no more dict */
+    unsigned int   nextToUpdate;     /* index from which to continue dictionary update */
+    unsigned int   searchNum;        /* only for optimal parser */
+    unsigned int   compressionLevel;
+} LZ4HC_CCtx_internal;
+
+#endif
+
+#define LZ4_STREAMHCSIZE       (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56) /* 393268 */
+#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
+union LZ4_streamHC_u {
+    size_t table[LZ4_STREAMHCSIZE_SIZET];
+    LZ4HC_CCtx_internal internal_donotuse;
+};   /* previously typedef'd to LZ4_streamHC_t */
+/*
+  LZ4_streamHC_t :
+  This structure allows static allocation of LZ4 HC streaming state.
+  State must be initialized using LZ4_resetStreamHC() before first use.
+
+  Static allocation shall only be used in combination with static linking.
+  When invoking LZ4 from a DLL, use create/free functions instead, which are API and ABI stable.
+*/
+
 
-/**************************************
+/*-************************************
 *  Deprecated Functions
 **************************************/
-/* Deprecate Warnings */
-/* Should these warnings messages be a problem,
-   it is generally possible to disable them,
-   with -Wno-deprecated-declarations for gcc
-   or _CRT_SECURE_NO_WARNINGS in Visual for example.
-   You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
-#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
-#  define LZ4_DEPRECATE_WARNING_DEFBLOCK
-#  define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
-#  if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
-#    define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
-#  elif (LZ4_GCC_VERSION >= 301)
-#    define LZ4_DEPRECATED(message) __attribute__((deprecated))
-#  elif defined(_MSC_VER)
-#    define LZ4_DEPRECATED(message) __declspec(deprecated(message))
-#  else
-#    pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
-#    define LZ4_DEPRECATED(message)
-#  endif
-#endif // LZ4_DEPRECATE_WARNING_DEFBLOCK
-
-/* compression functions */
-/* these functions are planned to trigger warning messages by r131 approximately */
-int LZ4_compressHC                (const char* source, char* dest, int inputSize);
-int LZ4_compressHC_limitedOutput  (const char* source, char* dest, int inputSize, int maxOutputSize);
-int LZ4_compressHC2               (const char* source, char* dest, int inputSize, int compressionLevel);
-int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-int LZ4_compressHC_withStateHC               (void* state, const char* source, char* dest, int inputSize);
-int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
-int LZ4_compressHC2_withStateHC              (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
-int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-int LZ4_compressHC_continue               (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
-int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
-
-/* Streaming functions following the older model; should no longer be used */
+/* see lz4.h LZ4_DISABLE_DEPRECATE_WARNINGS to turn off deprecation warnings */
+
+/* deprecated compression functions */
+/* these functions will trigger warning messages in future releases */
+LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC               (const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
+LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
+LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_withStateHC               (void* state, const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
+LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
+LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_continue               (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
+LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
+
+/* Deprecated Streaming functions using older model; should no longer be used */
 LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
 LZ4_DEPRECATED("use LZ4_saveDictHC() instead")     char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
 LZ4_DEPRECATED("use LZ4_freeStreamHC() instead")   int   LZ4_freeHC (void* LZ4HC_Data);
-LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int   LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int   LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
+LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
+LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
 LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int   LZ4_sizeofStreamStateHC(void);
 LZ4_DEPRECATED("use LZ4_resetStreamHC() instead")  int   LZ4_resetStreamStateHC(void* state, char* inputBuffer);
 
@@ -187,3 +224,5 @@ LZ4_DEPRECATED("use LZ4_resetStreamHC() instead")  int   LZ4_resetStreamStateHC(
 #if defined (__cplusplus)
 }
 #endif
+
+#endif /* LZ4_HC_H_19834876238432 */

Source/ThirdParty/LZ4/lz4opt.h

@@ -0,0 +1,363 @@
+/*
+    lz4opt.h - Optimal Mode of LZ4
+    Copyright (C) 2015-2016, Przemyslaw Skibinski <[email protected]>
+    Note : this file is intended to be included within lz4hc.c
+
+    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.
+
+    You can contact the author at :
+       - LZ4 source repository : https://github.com/lz4/lz4
+       - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
+*/
+
+#define LZ4_OPT_NUM   (1<<12)
+
+
+typedef struct
+{
+    int off;
+    int len;
+} LZ4HC_match_t;
+
+typedef struct
+{
+    int price;
+    int off;
+    int mlen;
+    int litlen;
+} LZ4HC_optimal_t;
+
+
+/* price in bits */
+FORCE_INLINE size_t LZ4HC_literalsPrice(size_t litlen)
+{
+    size_t price = 8*litlen;
+    if (litlen >= (size_t)RUN_MASK) price+=8*(1+(litlen-RUN_MASK)/255);
+    return price;
+}
+
+
+/* requires mlen >= MINMATCH */
+FORCE_INLINE size_t LZ4HC_sequencePrice(size_t litlen, size_t mlen)
+{
+    size_t price = 16 + 8; /* 16-bit offset + token */
+
+    price += LZ4HC_literalsPrice(litlen);
+
+    mlen -= MINMATCH;
+    if (mlen >= (size_t)ML_MASK) price+=8*(1+(mlen-ML_MASK)/255);
+
+    return price;
+}
+
+
+/*-*************************************
+*  Binary Tree search
+***************************************/
+FORCE_INLINE int LZ4HC_BinTree_InsertAndGetAllMatches (
+    LZ4HC_CCtx_internal* ctx,
+    const BYTE* const ip,
+    const BYTE* const iHighLimit,
+    size_t best_mlen,
+    LZ4HC_match_t* matches,
+    int* matchNum)
+{
+    U16* const chainTable = ctx->chainTable;
+    U32* const HashTable = ctx->hashTable;
+    const BYTE* const base = ctx->base;
+    const U32 dictLimit = ctx->dictLimit;
+    const U32 current = (U32)(ip - base);
+    const U32 lowLimit = (ctx->lowLimit + MAX_DISTANCE > current) ? ctx->lowLimit : current - (MAX_DISTANCE - 1);
+    const BYTE* const dictBase = ctx->dictBase;
+    const BYTE* match;
+    int nbAttempts = ctx->searchNum;
+    int mnum = 0;
+    U16 *ptr0, *ptr1, delta0, delta1;
+    U32 matchIndex;
+    size_t matchLength = 0;
+    U32* HashPos;
+
+    if (ip + MINMATCH > iHighLimit) return 1;
+
+    /* HC4 match finder */
+    HashPos = &HashTable[LZ4HC_hashPtr(ip)];
+    matchIndex = *HashPos;
+    *HashPos = current;
+
+    ptr0 = &DELTANEXTMAXD(current*2+1);
+    ptr1 = &DELTANEXTMAXD(current*2);
+    delta0 = delta1 = (U16)(current - matchIndex);
+
+    while ((matchIndex < current) && (matchIndex>=lowLimit) && (nbAttempts)) {
+        nbAttempts--;
+        if (matchIndex >= dictLimit) {
+            match = base + matchIndex;
+            matchLength = LZ4_count(ip, match, iHighLimit);
+        } else {
+            const BYTE* vLimit = ip + (dictLimit - matchIndex);
+            match = dictBase + matchIndex;
+            if (vLimit > iHighLimit) vLimit = iHighLimit;
+            matchLength = LZ4_count(ip, match, vLimit);
+            if ((ip+matchLength == vLimit) && (vLimit < iHighLimit))
+                matchLength += LZ4_count(ip+matchLength, base+dictLimit, iHighLimit);
+        }
+
+        if (matchLength > best_mlen) {
+            best_mlen = matchLength;
+            if (matches) {
+                if (matchIndex >= dictLimit)
+                    matches[mnum].off = (int)(ip - match);
+                else
+                    matches[mnum].off = (int)(ip - (base + matchIndex)); /* virtual matchpos */
+                matches[mnum].len = (int)matchLength;
+                mnum++;
+            }
+            if (best_mlen > LZ4_OPT_NUM) break;
+        }
+
+        if (ip+matchLength >= iHighLimit)   /* equal : no way to know if inf or sup */
+            break;   /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt the tree */
+
+        if (*(ip+matchLength) < *(match+matchLength)) {
+            *ptr0 = delta0;
+            ptr0 = &DELTANEXTMAXD(matchIndex*2);
+            if (*ptr0 == (U16)-1) break;
+            delta0 = *ptr0;
+            delta1 += delta0;
+            matchIndex -= delta0;
+        } else {
+            *ptr1 = delta1;
+            ptr1 = &DELTANEXTMAXD(matchIndex*2+1);
+            if (*ptr1 == (U16)-1) break;
+            delta1 = *ptr1;
+            delta0 += delta1;
+            matchIndex -= delta1;
+        }
+    }
+
+    *ptr0 = (U16)-1;
+    *ptr1 = (U16)-1;
+    if (matchNum) *matchNum = mnum;
+  /*  if (best_mlen > 8) return best_mlen-8; */
+    if (!matchNum) return 1;
+    return 1;
+}
+
+
+FORCE_INLINE void LZ4HC_updateBinTree(LZ4HC_CCtx_internal* ctx, const BYTE* const ip, const BYTE* const iHighLimit)
+{
+    const BYTE* const base = ctx->base;
+    const U32 target = (U32)(ip - base);
+    U32 idx = ctx->nextToUpdate;
+    while(idx < target)
+        idx += LZ4HC_BinTree_InsertAndGetAllMatches(ctx, base+idx, iHighLimit, 8, NULL, NULL);
+}
+
+
+/** Tree updater, providing best match */
+FORCE_INLINE int LZ4HC_BinTree_GetAllMatches (
+                        LZ4HC_CCtx_internal* ctx,
+                        const BYTE* const ip, const BYTE* const iHighLimit,
+                        size_t best_mlen, LZ4HC_match_t* matches, const int fullUpdate)
+{
+    int mnum = 0;
+    if (ip < ctx->base + ctx->nextToUpdate) return 0;   /* skipped area */
+    if (fullUpdate) LZ4HC_updateBinTree(ctx, ip, iHighLimit);
+    best_mlen = LZ4HC_BinTree_InsertAndGetAllMatches(ctx, ip, iHighLimit, best_mlen, matches, &mnum);
+    ctx->nextToUpdate = (U32)(ip - ctx->base + best_mlen);
+    return mnum;
+}
+
+
+#define SET_PRICE(pos, mlen, offset, litlen, price)    \
+{                                                      \
+    while (last_pos < pos)  { opt[last_pos+1].price = 1<<30; last_pos++; } \
+    opt[pos].mlen = (int)mlen;                         \
+    opt[pos].off = (int)offset;                        \
+    opt[pos].litlen = (int)litlen;                     \
+    opt[pos].price = (int)price;                       \
+}
+
+
+static int LZ4HC_compress_optimal (
+    LZ4HC_CCtx_internal* ctx,
+    const char* const source,
+    char* dest,
+    int inputSize,
+    int maxOutputSize,
+    limitedOutput_directive limit,
+    const size_t sufficient_len,
+    const int fullUpdate
+    )
+{
+    LZ4HC_optimal_t opt[LZ4_OPT_NUM + 1];
+    LZ4HC_match_t matches[LZ4_OPT_NUM + 1];
+    const BYTE *inr = NULL;
+    size_t res, cur, cur2;
+    size_t i, llen, litlen, mlen, best_mlen, price, offset, best_off, match_num, last_pos;
+
+    const BYTE* ip = (const BYTE*) source;
+    const BYTE* anchor = ip;
+    const BYTE* const iend = ip + inputSize;
+    const BYTE* const mflimit = iend - MFLIMIT;
+    const BYTE* const matchlimit = (iend - LASTLITERALS);
+    BYTE* op = (BYTE*) dest;
+    BYTE* const oend = op + maxOutputSize;
+
+    /* init */
+    ctx->end += inputSize;
+    ip++;
+
+    /* Main Loop */
+    while (ip < mflimit) {
+        memset(opt, 0, sizeof(LZ4HC_optimal_t));
+        last_pos = 0;
+        llen = ip - anchor;
+        match_num = LZ4HC_BinTree_GetAllMatches(ctx, ip, matchlimit, MINMATCH-1, matches, fullUpdate);
+        if (!match_num) { ip++; continue; }
+
+        if ((size_t)matches[match_num-1].len > sufficient_len) {
+            best_mlen = matches[match_num-1].len;
+            best_off = matches[match_num-1].off;
+            cur = 0;
+            last_pos = 1;
+            goto encode;
+        }
+
+        /* set prices using matches at position = 0 */
+        for (i = 0; i < match_num; i++) {
+           mlen = (i>0) ? (size_t)matches[i-1].len+1 : MINMATCH;
+           best_mlen = (matches[i].len < LZ4_OPT_NUM) ? matches[i].len : LZ4_OPT_NUM;
+           while (mlen <= best_mlen) {
+                litlen = 0;
+                price = LZ4HC_sequencePrice(llen + litlen, mlen) - LZ4HC_literalsPrice(llen);
+                SET_PRICE(mlen, mlen, matches[i].off, litlen, price);
+                mlen++;
+           }
+        }
+
+        if (last_pos < MINMATCH) { ip++; continue; }
+
+        /* check further positions */
+        opt[0].mlen = opt[1].mlen = 1;
+        for (cur = 1; cur <= last_pos; cur++) {
+            inr = ip + cur;
+
+            if (opt[cur-1].mlen == 1) {
+                litlen = opt[cur-1].litlen + 1;
+                if (cur != litlen) {
+                    price = opt[cur - litlen].price + LZ4HC_literalsPrice(litlen);
+                } else {
+                    price = LZ4HC_literalsPrice(llen + litlen) - LZ4HC_literalsPrice(llen);
+                }
+            } else {
+                litlen = 1;
+                price = opt[cur - 1].price + LZ4HC_literalsPrice(litlen);
+            }
+
+            mlen = 1;
+            best_mlen = 0;
+            if (cur > last_pos || price < (size_t)opt[cur].price)
+                SET_PRICE(cur, mlen, best_mlen, litlen, price);
+
+            if (cur == last_pos || inr >= mflimit) break;
+
+            match_num = LZ4HC_BinTree_GetAllMatches(ctx, inr, matchlimit, MINMATCH-1, matches, fullUpdate);
+            if (match_num > 0 && (size_t)matches[match_num-1].len > sufficient_len) {
+                best_mlen = matches[match_num-1].len;
+                best_off = matches[match_num-1].off;
+                last_pos = cur + 1;
+                goto encode;
+            }
+
+            /* set prices using matches at position = cur */
+            for (i = 0; i < match_num; i++) {
+                mlen = (i>0) ? (size_t)matches[i-1].len+1 : MINMATCH;
+                cur2 = cur;
+                best_mlen = (cur2 + matches[i].len < LZ4_OPT_NUM) ? (size_t)matches[i].len : LZ4_OPT_NUM - cur2;
+
+                while (mlen <= best_mlen) {
+                    if (opt[cur2].mlen == 1) {
+                        litlen = opt[cur2].litlen;
+
+                        if (cur2 != litlen)
+                            price = opt[cur2 - litlen].price + LZ4HC_sequencePrice(litlen, mlen);
+                        else
+                            price = LZ4HC_sequencePrice(llen + litlen, mlen) - LZ4HC_literalsPrice(llen);
+                    } else {
+                        litlen = 0;
+                        price = opt[cur2].price + LZ4HC_sequencePrice(litlen, mlen);
+                    }
+
+                    if (cur2 + mlen > last_pos || price < (size_t)opt[cur2 + mlen].price) { // || (((int)price == opt[cur2 + mlen].price) && (opt[cur2 + mlen-1].mlen == 1))) {
+                        SET_PRICE(cur2 + mlen, mlen, matches[i].off, litlen, price);
+                    }
+                    mlen++;
+                }
+            }
+        } /* for (cur = 1; cur <= last_pos; cur++) */
+
+        best_mlen = opt[last_pos].mlen;
+        best_off = opt[last_pos].off;
+        cur = last_pos - best_mlen;
+
+encode: /* cur, last_pos, best_mlen, best_off have to be set */
+        opt[0].mlen = 1;
+        while (1) {
+            mlen = opt[cur].mlen;
+            offset = opt[cur].off;
+            opt[cur].mlen = (int)best_mlen;
+            opt[cur].off = (int)best_off;
+            best_mlen = mlen;
+            best_off = offset;
+            if (mlen > cur) break;
+            cur -= mlen;
+        }
+
+        cur = 0;
+        while (cur < last_pos) {
+            mlen = opt[cur].mlen;
+            if (mlen == 1) { ip++; cur++; continue; }
+            offset = opt[cur].off;
+            cur += mlen;
+
+            res = LZ4HC_encodeSequence(&ip, &op, &anchor, (int)mlen, ip - offset, limit, oend);
+            if (res) return 0;
+        }
+    }
+
+    /* Encode Last Literals */
+    {   int lastRun = (int)(iend - anchor);
+        if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0;  /* Check output limit */
+        if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
+        else *op++ = (BYTE)(lastRun<<ML_BITS);
+        memcpy(op, anchor, iend - anchor);
+        op += iend-anchor;
+    }
+
+    /* End */
+    return (int) ((char*)op-dest);
+}