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From whe...@apache.org
Subject [1/2] hadoop git commit: Revert "HADOOP-12572. Update Hadoop's lz4 to r131. Contributed by Kevin Bowling."
Date Mon, 23 Nov 2015 23:00:04 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 d13b646c6 -> 75b007260


http://git-wip-us.apache.org/repos/asf/hadoop/blob/75b00726/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h
index 3e74002..44ada14 100644
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h
+++ b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h
@@ -1,8 +1,7 @@
 /*
    LZ4 - Fast LZ compression algorithm
    Header File
-   Copyright (C) 2011-2015, Yann Collet.
-
+   Copyright (C) 2011-2014, 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
@@ -29,7 +28,7 @@
    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 : http://code.google.com/p/lz4/
    - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
 */
 #pragma once
@@ -39,22 +38,22 @@ extern "C" {
 #endif
 
 /*
- * 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.h provides raw compression format functions, for optimal performance and integration into programs.
+ * If you need to generate data using an inter-operable format (respecting the framing specification),
+ * please use lz4frame.h instead.
 */
 
 /**************************************
-*  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_MAJOR    1    /* for major interface/format changes  */
+#define LZ4_VERSION_MINOR    3    /* for minor interface/format changes  */
 #define LZ4_VERSION_RELEASE  1    /* 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);
 
 /**************************************
-*  Tuning parameter
+   Tuning parameter
 **************************************/
 /*
  * LZ4_MEMORY_USAGE :
@@ -67,90 +66,77 @@ int LZ4_versionNumber (void);
 
 
 /**************************************
-*  Simple Functions
+   Simple Functions
 **************************************/
 
-int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
+int LZ4_compress        (const char* source, char* dest, int sourceSize);
 int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
 
 /*
-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).
-    It also runs faster, so it's a recommended setting.
-    If the function cannot compress 'source' into a more limited 'dest' budget,
-    compression stops *immediately*, and the function result is zero.
-    As a consequence, 'dest' content is not valid.
-    This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
-        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
+LZ4_compress() :
+    Compresses 'sourceSize' bytes from 'source' into 'dest'.
+    Destination buffer must be already allocated,
+    and must be sized to handle worst cases situations (input data not compressible)
+    Worst case size evaluation is provided by function LZ4_compressBound()
+    inputSize : Max supported value is LZ4_MAX_INPUT_SIZE
+    return : the number of bytes written in buffer dest
+             or 0 if the compression fails
 
 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)
-             If destination buffer is not large enough, decoding will stop and output an error code (<0).
+    compressedSize : is obviously the source size
+    maxDecompressedSize : is the size of the destination buffer, which must be already allocated.
+    return : the number of bytes decompressed into the destination buffer (necessarily <= maxDecompressedSize)
+             If the destination buffer is not large enough, decoding will stop and output an error code (<0).
              If the source stream is detected malformed, the function will stop decoding and return a negative result.
-             This function is protected against buffer overflow exploits, including malicious data packets.
-             It never writes outside output buffer, nor reads outside input buffer.
+             This function is protected against buffer overflow exploits,
+             and never writes outside of output buffer, nor reads outside of input buffer.
+             It is also protected against malicious data packets.
 */
 
 
 /**************************************
-*  Advanced Functions
+   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)
+#define LZ4_COMPRESSBOUND(isize)  ((unsigned int)(isize) > (unsigned int)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).
+    This function is primarily useful for memory allocation purposes (output buffer size).
     Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
-    Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize)
-        inputSize  : max supported value is LZ4_MAX_INPUT_SIZE
-        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);
 
-/*
-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.
-    It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
-    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.
+    isize  : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE
+    return : maximum output size in a "worst case" scenario
+             or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
 */
-int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
+int LZ4_compressBound(int isize);
 
 
 /*
-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.
+LZ4_compress_limitedOutput() :
+    Compress 'sourceSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
+    If it cannot achieve it, compression will stop, and result of the function will be zero.
+    This saves time and memory on detecting non-compressible (or barely compressible) data.
+    This function never writes outside of provided output buffer.
+
+    sourceSize  : Max supported value is LZ4_MAX_INPUT_VALUE
+    maxOutputSize : is the size of the destination buffer (which must be already allocated)
+    return : the number of bytes written in buffer 'dest'
+             or 0 if compression fails
 */
-int LZ4_sizeofState(void);
-int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
+int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
 
 
 /*
-LZ4_compress_destSize() :
-    Reverse the logic, by compressing as much data as possible from 'source' buffer
-    into already allocated buffer 'dest' of size 'targetDestSize'.
-    This function either compresses the entire 'source' content into 'dest' if it's large enough,
-    or fill 'dest' buffer completely with as much data as possible from 'source'.
-        *sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
-                         New value is necessarily <= old value.
-        return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
-              or 0 if compression fails
+LZ4_compress_withState() :
+    Same compression functions, but using an externally allocated memory space to store compression state.
+    Use LZ4_sizeofState() to know how much memory must be allocated,
+    and then, provide it as 'void* state' to compression functions.
 */
-int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
+int LZ4_sizeofState(void);
+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);
 
 
 /*
@@ -166,6 +152,7 @@ LZ4_decompress_fast() :
 */
 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'
@@ -182,108 +169,104 @@ int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedS
 
 
 /***********************************************
-*  Streaming Compression Functions
+   Experimental Streaming Compression Functions
 ***********************************************/
-#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
-#define LZ4_STREAMSIZE     (LZ4_STREAMSIZE_U64 * sizeof(long long))
+
+#define LZ4_STREAMSIZE_U32 ((1 << (LZ4_MEMORY_USAGE-2)) + 8)
+#define LZ4_STREAMSIZE     (LZ4_STREAMSIZE_U32 * sizeof(unsigned int))
 /*
  * 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 struct { unsigned int table[LZ4_STREAMSIZE_U32]; } LZ4_stream_t;
 
 /*
  * LZ4_resetStream
  * Use this function to init an allocated LZ4_stream_t structure
  */
-void LZ4_resetStream (LZ4_stream_t* streamPtr);
+void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
 
 /*
+ * If you prefer dynamic allocation methods,
  * 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_stream_t* LZ4_createStream(void);
-int           LZ4_freeStream (LZ4_stream_t* streamPtr);
+int           LZ4_freeStream (LZ4_stream_t* LZ4_stream);
 
 /*
  * 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)
+ * Return : 1 if OK, 0 if error
  */
-int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
+int LZ4_loadDict (LZ4_stream_t* LZ4_stream, 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.
+ * LZ4_compress_continue
+ * Compress data block 'source', using blocks compressed before as dictionary to improve compression ratio
+ * Previous data blocks are assumed to still be present at their previous location.
  */
-int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
+int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize);
+
+/*
+ * LZ4_compress_limitedOutput_continue
+ * Same as before, but also specify a maximum target compressed size (maxOutputSize)
+ * If objective cannot be met, compression exits, and returns a zero.
+ */
+int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize);
 
 /*
  * 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
+ *        dictionary is immediately usable, you can therefore call again LZ4_compress_continue()
+ * Return : dictionary size in bytes, or 0 if error
+ * Note : any dictSize > 64 KB will be interpreted as 64KB.
  */
-int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
+int LZ4_saveDict (LZ4_stream_t* LZ4_stream, char* safeBuffer, int dictSize);
 
 
 /************************************************
-*  Streaming Decompression Functions
+  Experimental Streaming Decompression Functions
 ************************************************/
 
-#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;
+#define LZ4_STREAMDECODESIZE_U32 4
+#define LZ4_STREAMDECODESIZE     (LZ4_STREAMDECODESIZE_U32 * sizeof(unsigned int))
 /*
  * 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.
+ * important : init this structure content using LZ4_setStreamDecode or memset() before first use !
  */
-LZ4_streamDecode_t* LZ4_createStreamDecode(void);
-int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
+typedef struct { unsigned int table[LZ4_STREAMDECODESIZE_U32]; } LZ4_streamDecode_t;
 
 /*
  * LZ4_setStreamDecode
  * Use this function to instruct where to find the dictionary.
- * Setting a size of 0 is allowed (same effect as reset).
+ * This function can be used to specify a static dictionary,
+ * or to instruct where to find some previously decoded data saved into a different memory space.
+ * Setting a size of 0 is allowed (same effect as no dictionary).
  * Return : 1 if OK, 0 if error
  */
 int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
 
 /*
+ * If you prefer dynamic allocation methods,
+ * 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);
+
+/*
 *_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 :
-    - Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
-      In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
-    - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
-      maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
-      In which case, encoding and decoding buffers do not need to be synchronized,
-      and encoding ring buffer can have any size, including small ones ( < 64 KB).
-    - _At least_ 64 KB + 8 bytes + maxBlockSize.
-      In which case, encoding and decoding buffers do not need to be synchronized,
-      and encoding ring buffer can have any size, including larger than decoding buffer.
-    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()
+    Previously decoded blocks must still be available at the memory position where they were decoded.
+    If it's not possible, save the relevant part of decoded data into a safe buffer,
+    and indicate where its new address 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);
@@ -293,8 +276,8 @@ int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const ch
 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.
+    a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
+    They don't use 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);
@@ -302,57 +285,37 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
 
 
 /**************************************
-*  Obsolete Functions
+   Obsolete 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 */
-
-/* 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);
-
-/* 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.
-    - 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.
-   It is highly recommended to stop using these prototypes and migrate to maintained ones */
+/*
+Obsolete decompression functions
+These function names are deprecated and should no longer be used.
+They are only provided here for compatibility with older user 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 if you really need them.
+It is highly recommended to stop using these functions and migrated to newer ones */
 /* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
 /* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
 
+/*
+ * If you prefer dynamic allocation methods,
+ * LZ4_createStreamDecode()
+ * provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure.
+ * LZ4_free just frees it.
+ */
+/* void* LZ4_createStreamDecode(void); */
+/*int   LZ4_free (void* LZ4_stream);    yes, it's the same one as for compression */
+
 /* Obsolete streaming functions; use new streaming interface whenever possible */
-LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
-LZ4_DEPRECATED("use LZ4_createStream() instead") int   LZ4_sizeofStreamState(void);
-LZ4_DEPRECATED("use LZ4_resetStream() instead")  int   LZ4_resetStreamState(void* state, char* inputBuffer);
-LZ4_DEPRECATED("use LZ4_saveDict() instead")     char* LZ4_slideInputBuffer (void* state);
+void* LZ4_create (const char* inputBuffer);
+int   LZ4_sizeofStreamState(void);
+int   LZ4_resetStreamState(void* state, const char* inputBuffer);
+char* LZ4_slideInputBuffer (void* state);
 
 /* Obsolete streaming decoding functions */
-LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
-LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
+int LZ4_decompress_safe_withPrefix64k (const char* source, char* dest, int compressedSize, int maxOutputSize);
+int LZ4_decompress_fast_withPrefix64k (const char* source, char* dest, int originalSize);
 
 
 #if defined (__cplusplus)

http://git-wip-us.apache.org/repos/asf/hadoop/blob/75b00726/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c
index bbe7a9d..34a6173 100644
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c
+++ b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c
@@ -1,279 +1,566 @@
 /*
-    LZ4 HC - High Compression Mode of LZ4
-    Copyright (C) 2011-2015, 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.
-
-    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 HC - High Compression Mode of LZ4
+   Copyright (C) 2011-2014, 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.
+
+   You can contact the author at :
+   - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
+   - LZ4 source repository : http://code.google.com/p/lz4/
 */
 
 
 
 /**************************************
-*  Tuning Parameter
+   Tuning Parameter
 **************************************/
-static const int LZ4HC_compressionLevel_default = 9;
+#define LZ4HC_DEFAULT_COMPRESSIONLEVEL 8
 
 
 /**************************************
-*  Includes
+   Memory routines
 **************************************/
-#include "lz4hc.h"
+#include <stdlib.h>   /* calloc, free */
+#define ALLOCATOR(s)  calloc(1,s)
+#define FREEMEM       free
+#include <string.h>   /* memset, memcpy */
+#define MEM_INIT      memset
+
+
+/**************************************
+   CPU Feature Detection
+**************************************/
+/* 32 or 64 bits ? */
+#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \
+  || defined(__64BIT__)  || defined(__mips64) \
+  || defined(__powerpc64__) || defined(__powerpc64le__) \
+  || defined(__ppc64__) || defined(__ppc64le__) \
+  || defined(__PPC64__) || defined(__PPC64LE__) \
+  || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) \
+  || defined(__s390x__) )   /* Detects 64 bits mode */
+#  define LZ4_ARCH64 1
+#else
+#  define LZ4_ARCH64 0
+#endif
+
+/*
+ * Little Endian or Big Endian ?
+ * Overwrite the #define below if you know your architecture endianess
+ */
+#include <stdlib.h>   /* Apparently required to detect endianess */
+#if defined (__GLIBC__)
+#  include <endian.h>
+#  if (__BYTE_ORDER == __BIG_ENDIAN)
+#     define LZ4_BIG_ENDIAN 1
+#  endif
+#elif (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN))
+#  define LZ4_BIG_ENDIAN 1
+#elif defined(__sparc) || defined(__sparc__) \
+   || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \
+   || defined(__hpux)  || defined(__hppa) \
+   || defined(_MIPSEB) || defined(__s390__)
+#  define LZ4_BIG_ENDIAN 1
+#else
+/* Little Endian assumed. PDP Endian and other very rare endian format are unsupported. */
+#endif
+
+/*
+ * Unaligned memory access is automatically enabled for "common" CPU, such as x86.
+ * For others CPU, the compiler will be more cautious, and insert extra code to ensure aligned access is respected
+ * If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance
+ */
+#if defined(__ARM_FEATURE_UNALIGNED)
+#  define LZ4_FORCE_UNALIGNED_ACCESS 1
+#endif
+
+/* Define this parameter if your target system or compiler does not support hardware bit count */
+#if defined(_MSC_VER) && defined(_WIN32_WCE)            /* Visual Studio for Windows CE does not support Hardware bit count */
+#  define LZ4_FORCE_SW_BITCOUNT
+#endif
 
 
 /**************************************
-*  Local Compiler Options
+ Compiler Options
 **************************************/
-#if defined(__GNUC__)
-#  pragma GCC diagnostic ignored "-Wunused-function"
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)   /* C99 */
+/* "restrict" is a known keyword */
+#else
+#  define restrict /* Disable restrict */
 #endif
 
-#if defined (__clang__)
-#  pragma clang diagnostic ignored "-Wunused-function"
+#ifdef _MSC_VER    /* Visual Studio */
+#  define FORCE_INLINE static __forceinline
+#  include <intrin.h>                    /* For Visual 2005 */
+#  if LZ4_ARCH64   /* 64-bits */
+#    pragma intrinsic(_BitScanForward64) /* For Visual 2005 */
+#    pragma intrinsic(_BitScanReverse64) /* For Visual 2005 */
+#  else            /* 32-bits */
+#    pragma intrinsic(_BitScanForward)   /* For Visual 2005 */
+#    pragma intrinsic(_BitScanReverse)   /* For Visual 2005 */
+#  endif
+#  pragma warning(disable : 4127)        /* disable: C4127: conditional expression is constant */
+#  pragma warning(disable : 4701)        /* disable: C4701: potentially uninitialized local variable used */
+#else
+#  ifdef __GNUC__
+#    define FORCE_INLINE static inline __attribute__((always_inline))
+#  else
+#    define FORCE_INLINE static inline
+#  endif
+#endif
+
+#ifdef _MSC_VER  /* Visual Studio */
+#  define lz4_bswap16(x) _byteswap_ushort(x)
+#else
+#  define lz4_bswap16(x)  ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
 #endif
 
 
 /**************************************
-*  Common LZ4 definition
+   Includes
 **************************************/
-#define LZ4_COMMONDEFS_ONLY
-#include "lz4.c"
+#include "lz4hc.h"
+#include "lz4.h"
 
 
 /**************************************
-*  Local Constants
+   Basic Types
 **************************************/
+#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)   /* C99 */
+# include <stdint.h>
+  typedef uint8_t  BYTE;
+  typedef uint16_t U16;
+  typedef uint32_t U32;
+  typedef  int32_t S32;
+  typedef uint64_t U64;
+#else
+  typedef unsigned char       BYTE;
+  typedef unsigned short      U16;
+  typedef unsigned int        U32;
+  typedef   signed int        S32;
+  typedef unsigned long long  U64;
+#endif
+
+#if defined(__GNUC__)  && !defined(LZ4_FORCE_UNALIGNED_ACCESS)
+#  define _PACKED __attribute__ ((packed))
+#else
+#  define _PACKED
+#endif
+
+#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
+#  ifdef __IBMC__
+#    pragma pack(1)
+#  else
+#    pragma pack(push, 1)
+#  endif
+#endif
+
+typedef struct _U16_S { U16 v; } _PACKED U16_S;
+typedef struct _U32_S { U32 v; } _PACKED U32_S;
+typedef struct _U64_S { U64 v; } _PACKED U64_S;
+
+#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
+#  pragma pack(pop)
+#endif
+
+#define A64(x) (((U64_S *)(x))->v)
+#define A32(x) (((U32_S *)(x))->v)
+#define A16(x) (((U16_S *)(x))->v)
+
+
+/**************************************
+   Constants
+**************************************/
+#define MINMATCH 4
+
 #define DICTIONARY_LOGSIZE 16
 #define MAXD (1<<DICTIONARY_LOGSIZE)
-#define MAXD_MASK (MAXD - 1)
+#define MAXD_MASK ((U32)(MAXD - 1))
+#define MAX_DISTANCE (MAXD - 1)
 
 #define HASH_LOG (DICTIONARY_LOGSIZE-1)
 #define HASHTABLESIZE (1 << HASH_LOG)
 #define HASH_MASK (HASHTABLESIZE - 1)
 
+#define ML_BITS  4
+#define ML_MASK  (size_t)((1U<<ML_BITS)-1)
+#define RUN_BITS (8-ML_BITS)
+#define RUN_MASK ((1U<<RUN_BITS)-1)
+
+#define COPYLENGTH 8
+#define LASTLITERALS 5
+#define MFLIMIT (COPYLENGTH+MINMATCH)
+#define MINLENGTH (MFLIMIT+1)
 #define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
 
-static const int g_maxCompressionLevel = 16;
+#define KB *(1U<<10)
+#define MB *(1U<<20)
+#define GB *(1U<<30)
 
 
 /**************************************
-*  Local Types
+   Architecture-specific macros
+**************************************/
+#if LZ4_ARCH64   /* 64-bit */
+#  define STEPSIZE 8
+#  define LZ4_COPYSTEP(s,d)     A64(d) = A64(s); d+=8; s+=8;
+#  define LZ4_COPYPACKET(s,d)   LZ4_COPYSTEP(s,d)
+#  define AARCH A64
+#  define HTYPE                 U32
+#  define INITBASE(b,s)         const BYTE* const b = s
+#else            /* 32-bit */
+#  define STEPSIZE 4
+#  define LZ4_COPYSTEP(s,d)     A32(d) = A32(s); d+=4; s+=4;
+#  define LZ4_COPYPACKET(s,d)   LZ4_COPYSTEP(s,d); LZ4_COPYSTEP(s,d);
+#  define AARCH A32
+#  define HTYPE                 U32
+#  define INITBASE(b,s)         const BYTE* const b = s
+#endif
+
+#if defined(LZ4_BIG_ENDIAN)
+#  define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
+#  define LZ4_WRITE_LITTLEENDIAN_16(p,i)  { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; }
+#else      /* Little Endian */
+#  define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
+#  define LZ4_WRITE_LITTLEENDIAN_16(p,v)  { A16(p) = v; p+=2; }
+#endif
+
+
+/**************************************
+   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;
+    const BYTE* inputBuffer;
+    const BYTE* base;
+    const BYTE* end;
+    HTYPE hashTable[HASHTABLESIZE];
+    U16 chainTable[MAXD];
+    const BYTE* nextToUpdate;
 } LZ4HC_Data_Structure;
 
 
 /**************************************
-*  Local Macros
+   Macros
 **************************************/
+#define LZ4_WILDCOPY(s,d,e)    do { LZ4_COPYPACKET(s,d) } while (d<e);
+#define LZ4_BLINDCOPY(s,d,l)   { BYTE* e=d+l; LZ4_WILDCOPY(s,d,e); d=e; }
 #define HASH_FUNCTION(i)       (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
-//#define DELTANEXTU16(p)        chainTable[(p) & MAXD_MASK]   /* flexible, MAXD dependent */
-#define DELTANEXTU16(p)        chainTable[(U16)(p)]   /* faster */
-
-static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
-
+#define HASH_VALUE(p)          HASH_FUNCTION(A32(p))
+#define HASH_POINTER(p)        (HashTable[HASH_VALUE(p)] + base)
+#define DELTANEXT(p)           chainTable[(size_t)(p) & MAXD_MASK]
+#define GETNEXT(p)             ((p) - (size_t)DELTANEXT(p))
 
 
 /**************************************
-*  HC Compression
+ Private functions
 **************************************/
-static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
+#if LZ4_ARCH64
+
+FORCE_INLINE int LZ4_NbCommonBytes (register U64 val)
+{
+#if defined(LZ4_BIG_ENDIAN)
+#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r = 0;
+    _BitScanReverse64( &r, val );
+    return (int)(r>>3);
+#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_clzll(val) >> 3);
+#  else
+    int r;
+    if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
+    if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
+    r += (!val);
+    return r;
+#  endif
+#else
+#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r = 0;
+    _BitScanForward64( &r, val );
+    return (int)(r>>3);
+#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_ctzll(val) >> 3);
+#  else
+    static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
+    return DeBruijnBytePos[((U64)((val & -val) * 0x0218A392CDABBD3F)) >> 58];
+#  endif
+#endif
+}
+
+#else
+
+FORCE_INLINE int LZ4_NbCommonBytes (register U32 val)
+{
+#if defined(LZ4_BIG_ENDIAN)
+#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r;
+    _BitScanReverse( &r, val );
+    return (int)(r>>3);
+#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_clz(val) >> 3);
+#  else
+    int r;
+    if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
+    r += (!val);
+    return r;
+#  endif
+#else
+#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r;
+    _BitScanForward( &r, val );
+    return (int)(r>>3);
+#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_ctz(val) >> 3);
+#  else
+    static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
+    return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
+#  endif
+#endif
+}
+
+#endif
+
+
+int LZ4_sizeofStreamStateHC()
+{
+    return sizeof(LZ4HC_Data_Structure);
+}
+
+FORCE_INLINE void LZ4_initHC (LZ4HC_Data_Structure* hc4, const BYTE* base)
 {
     MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable));
     MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
-    hc4->nextToUpdate = 64 KB;
-    hc4->base = start - 64 KB;
-    hc4->end = start;
-    hc4->dictBase = start - 64 KB;
-    hc4->dictLimit = 64 KB;
-    hc4->lowLimit = 64 KB;
+    hc4->nextToUpdate = base + 1;
+    hc4->base = base;
+    hc4->inputBuffer = base;
+    hc4->end = base;
+}
+
+int LZ4_resetStreamStateHC(void* state, const char* inputBuffer)
+{
+    if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1;   /* Error : pointer is not aligned for pointer (32 or 64 bits) */
+    LZ4_initHC((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer);
+    return 0;
+}
+
+
+void* LZ4_createHC (const char* inputBuffer)
+{
+    void* hc4 = ALLOCATOR(sizeof(LZ4HC_Data_Structure));
+    LZ4_initHC ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
+    return hc4;
+}
+
+
+int LZ4_freeHC (void* LZ4HC_Data)
+{
+    FREEMEM(LZ4HC_Data);
+    return (0);
 }
 
 
 /* Update chains up to ip (excluded) */
 FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
 {
-    U16* chainTable = hc4->chainTable;
-    U32* HashTable  = hc4->hashTable;
-    const BYTE* const base = hc4->base;
-    const U32 target = (U32)(ip - base);
-    U32 idx = hc4->nextToUpdate;
+    U16*   chainTable = hc4->chainTable;
+    HTYPE* HashTable  = hc4->hashTable;
+    INITBASE(base,hc4->base);
 
-    while(idx < target)
+    while(hc4->nextToUpdate < ip)
     {
-        U32 h = LZ4HC_hashPtr(base+idx);
-        size_t delta = idx - HashTable[h];
+        const BYTE* const p = hc4->nextToUpdate;
+        size_t delta = (p) - HASH_POINTER(p);
         if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
-        DELTANEXTU16(idx) = (U16)delta;
-        HashTable[h] = idx;
-        idx++;
+        DELTANEXT(p) = (U16)delta;
+        HashTable[HASH_VALUE(p)] = (HTYPE)((p) - base);
+        hc4->nextToUpdate++;
     }
+}
+
+
+char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
+{
+    LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
+    size_t distance = (hc4->end - 64 KB) - hc4->inputBuffer;
+
+    if (hc4->end <= hc4->inputBuffer + 64 KB) return (char*)(hc4->end);   /* no update : less than 64KB within buffer */
+
+    distance = (distance >> 16) << 16;   /* Must be a multiple of 64 KB */
+    LZ4HC_Insert(hc4, hc4->end - MINMATCH);
+    memcpy((void*)(hc4->end - 64 KB - distance), (const void*)(hc4->end - 64 KB), 64 KB);
+    hc4->nextToUpdate -= distance;
+    hc4->base -= distance;
+    if ((U32)(hc4->inputBuffer - hc4->base) > 1 GB + 64 KB)   /* Avoid overflow */
+    {
+        int i;
+        hc4->base += 1 GB;
+        for (i=0; i<HASHTABLESIZE; i++) hc4->hashTable[i] -= 1 GB;
+    }
+    hc4->end -= distance;
+    return (char*)(hc4->end);
+}
 
-    hc4->nextToUpdate = target;
+
+FORCE_INLINE size_t LZ4HC_CommonLength (const BYTE* p1, const BYTE* p2, const BYTE* const matchlimit)
+{
+    const BYTE* p1t = p1;
+
+    while (p1t<matchlimit-(STEPSIZE-1))
+    {
+        size_t diff = AARCH(p2) ^ AARCH(p1t);
+        if (!diff) { p1t+=STEPSIZE; p2+=STEPSIZE; continue; }
+        p1t += LZ4_NbCommonBytes(diff);
+        return (p1t - p1);
+    }
+    if (LZ4_ARCH64) if ((p1t<(matchlimit-3)) && (A32(p2) == A32(p1t))) { p1t+=4; p2+=4; }
+    if ((p1t<(matchlimit-1)) && (A16(p2) == A16(p1t))) { p1t+=2; p2+=2; }
+    if ((p1t<matchlimit) && (*p2 == *p1t)) p1t++;
+    return (p1t - p1);
 }
 
 
-FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4,   /* Index table will be updated */
-                                               const BYTE* ip, const BYTE* const iLimit,
-                                               const BYTE** matchpos,
-                                               const int maxNbAttempts)
+FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* const matchlimit, const BYTE** matchpos, const int maxNbAttempts)
 {
     U16* const chainTable = hc4->chainTable;
-    U32* const HashTable = hc4->hashTable;
-    const BYTE* const base = hc4->base;
-    const BYTE* const dictBase = hc4->dictBase;
-    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;
+    HTYPE* const HashTable = hc4->hashTable;
+    const BYTE* ref;
+    INITBASE(base,hc4->base);
     int nbAttempts=maxNbAttempts;
-    size_t ml=0;
+    size_t repl=0, ml=0;
+    U16 delta=0;  /* useless assignment, to remove an uninitialization warning */
 
     /* HC4 match finder */
     LZ4HC_Insert(hc4, ip);
-    matchIndex = HashTable[LZ4HC_hashPtr(ip)];
+    ref = HASH_POINTER(ip);
+
+#define REPEAT_OPTIMIZATION
+#ifdef REPEAT_OPTIMIZATION
+    /* Detect repetitive sequences of length <= 4 */
+    if ((U32)(ip-ref) <= 4)        /* potential repetition */
+    {
+        if (A32(ref) == A32(ip))   /* confirmed */
+        {
+            delta = (U16)(ip-ref);
+            repl = ml  = LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit) + MINMATCH;
+            *matchpos = ref;
+        }
+        ref = GETNEXT(ref);
+    }
+#endif
 
-    while ((matchIndex>=lowLimit) && (nbAttempts))
+    while (((U32)(ip-ref) <= MAX_DISTANCE) && (nbAttempts))
     {
         nbAttempts--;
-        if (matchIndex >= dictLimit)
+        if (*(ref+ml) == *(ip+ml))
+        if (A32(ref) == A32(ip))
         {
-            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;
-                if (mlt > ml) { ml = mlt; *matchpos = match; }
-            }
+            size_t mlt = LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit) + MINMATCH;
+            if (mlt > ml) { ml = mlt; *matchpos = ref; }
         }
-        else
+        ref = GETNEXT(ref);
+    }
+
+#ifdef REPEAT_OPTIMIZATION
+    /* Complete table */
+    if (repl)
+    {
+        const BYTE* ptr = ip;
+        const BYTE* end;
+
+        end = ip + repl - (MINMATCH-1);
+        while(ptr < end-delta)
         {
-            match = dictBase + matchIndex;
-            if (LZ4_read32(match) == LZ4_read32(ip))
-            {
-                size_t mlt;
-                const BYTE* vLimit = ip + (dictLimit - matchIndex);
-                if (vLimit > iLimit) vLimit = iLimit;
-                mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, vLimit) + MINMATCH;
-                if ((ip+mlt == vLimit) && (vLimit < iLimit))
-                    mlt += LZ4_count(ip+mlt, base+dictLimit, iLimit);
-                if (mlt > ml) { ml = mlt; *matchpos = base + matchIndex; }   /* virtual matchpos */
-            }
+            DELTANEXT(ptr) = delta;    /* Pre-Load */
+            ptr++;
         }
-        matchIndex -= DELTANEXTU16(matchIndex);
+        do
+        {
+            DELTANEXT(ptr) = delta;
+            HashTable[HASH_VALUE(ptr)] = (HTYPE)((ptr) - base);     /* Head of chain */
+            ptr++;
+        } while(ptr < end);
+        hc4->nextToUpdate = end;
     }
+#endif
 
     return (int)ml;
 }
 
 
-FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
-    LZ4HC_Data_Structure* hc4,
-    const BYTE* const ip,
-    const BYTE* const iLowLimit,
-    const BYTE* const iHighLimit,
-    int longest,
-    const BYTE** matchpos,
-    const BYTE** startpos,
-    const int maxNbAttempts)
+FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* startLimit, const BYTE* matchlimit, int longest, const BYTE** matchpos, const BYTE** startpos, const int maxNbAttempts)
 {
-    U16* const chainTable = hc4->chainTable;
-    U32* const HashTable = hc4->hashTable;
-    const BYTE* const base = hc4->base;
-    const U32 dictLimit = hc4->dictLimit;
-    const BYTE* const lowPrefixPtr = base + dictLimit;
-    const U32 lowLimit = (hc4->lowLimit + 64 KB > (U32)(ip-base)) ? hc4->lowLimit : (U32)(ip - base) - (64 KB - 1);
-    const BYTE* const dictBase = hc4->dictBase;
-    U32   matchIndex;
+    U16* const  chainTable = hc4->chainTable;
+    HTYPE* const HashTable = hc4->hashTable;
+    INITBASE(base,hc4->base);
+    const BYTE*  ref;
     int nbAttempts = maxNbAttempts;
-    int delta = (int)(ip-iLowLimit);
-
+    int delta = (int)(ip-startLimit);
 
     /* First Match */
     LZ4HC_Insert(hc4, ip);
-    matchIndex = HashTable[LZ4HC_hashPtr(ip)];
+    ref = HASH_POINTER(ip);
 
-    while ((matchIndex>=lowLimit) && (nbAttempts))
+    while (((U32)(ip-ref) <= MAX_DISTANCE) && (nbAttempts))
     {
         nbAttempts--;
-        if (matchIndex >= dictLimit)
+        if (*(startLimit + longest) == *(ref - delta + longest))
+        if (A32(ref) == A32(ip))
         {
-            const BYTE* matchPtr = base + matchIndex;
-            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;
+#if 1
+            const BYTE* reft = ref+MINMATCH;
+            const BYTE* ipt = ip+MINMATCH;
+            const BYTE* startt = ip;
 
-                    while ((ip+back>iLowLimit)
-                           && (matchPtr+back > lowPrefixPtr)
-                           && (ip[back-1] == matchPtr[back-1]))
-                            back--;
+            while (ipt<matchlimit-(STEPSIZE-1))
+            {
+                size_t diff = AARCH(reft) ^ AARCH(ipt);
+                if (!diff) { ipt+=STEPSIZE; reft+=STEPSIZE; continue; }
+                ipt += LZ4_NbCommonBytes(diff);
+                goto _endCount;
+            }
+            if (LZ4_ARCH64) if ((ipt<(matchlimit-3)) && (A32(reft) == A32(ipt))) { ipt+=4; reft+=4; }
+            if ((ipt<(matchlimit-1)) && (A16(reft) == A16(ipt))) { ipt+=2; reft+=2; }
+            if ((ipt<matchlimit) && (*reft == *ipt)) ipt++;
+_endCount:
+            reft = ref;
+#else
+            /* Easier for code maintenance, but unfortunately slower too */
+            const BYTE* startt = ip;
+            const BYTE* reft = ref;
+            const BYTE* ipt = ip + MINMATCH + LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit);
+#endif
 
-                    mlt -= back;
+            while ((startt>startLimit) && (reft > hc4->inputBuffer) && (startt[-1] == reft[-1])) {startt--; reft--;}
 
-                    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))
+            if ((ipt-startt) > longest)
             {
-                size_t mlt;
-                int back=0;
-                const BYTE* vLimit = ip + (dictLimit - matchIndex);
-                if (vLimit > iHighLimit) vLimit = iHighLimit;
-                mlt = LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
-                if ((ip+mlt == vLimit) && (vLimit < iHighLimit))
-                    mlt += LZ4_count(ip+mlt, base+dictLimit, iHighLimit);
-                while ((ip+back > iLowLimit) && (matchIndex+back > lowLimit) && (ip[back-1] == matchPtr[back-1])) back--;
-                mlt -= back;
-                if ((int)mlt > longest) { longest = (int)mlt; *matchpos = base + matchIndex + back; *startpos = ip+back; }
+                longest = (int)(ipt-startt);
+                *matchpos = reft;
+                *startpos = startt;
             }
         }
-        matchIndex -= DELTANEXTU16(matchIndex);
+        ref = GETNEXT(ref);
     }
 
     return longest;
@@ -282,44 +569,34 @@ FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
 
 typedef enum { noLimit = 0, limitedOutput = 1 } limitedOutput_directive;
 
-#define LZ4HC_DEBUG 0
-#if LZ4HC_DEBUG
-static unsigned debug = 0;
-#endif
-
 FORCE_INLINE int LZ4HC_encodeSequence (
-    const BYTE** ip,
-    BYTE** op,
-    const BYTE** anchor,
-    int matchLength,
-    const BYTE* const match,
-    limitedOutput_directive limitedOutputBuffer,
-    BYTE* oend)
+                       const BYTE** ip,
+                       BYTE** op,
+                       const BYTE** anchor,
+                       int matchLength,
+                       const BYTE* ref,
+                       limitedOutput_directive limitedOutputBuffer,
+                       BYTE* oend)
 {
     int length;
     BYTE* token;
 
-#if LZ4HC_DEBUG
-    if (debug) printf("literal : %u  --  match : %u  --  offset : %u\n", (U32)(*ip - *anchor), (U32)matchLength, (U32)(*ip-match));
-#endif
-
     /* Encode Literal length */
     length = (int)(*ip - *anchor);
     token = (*op)++;
-    if ((limitedOutputBuffer) && ((*op + (length>>8) + length + (2 + 1 + LASTLITERALS)) > oend)) return 1;   /* Check output limit */
+    if ((limitedOutputBuffer) && ((*op + length + (2 + 1 + LASTLITERALS) + (length>>8)) > oend)) return 1;   /* Check output limit */
     if (length>=(int)RUN_MASK) { int len; *token=(RUN_MASK<<ML_BITS); len = length-RUN_MASK; for(; len > 254 ; len-=255) *(*op)++ = 255;  *(*op)++ = (BYTE)len; }
     else *token = (BYTE)(length<<ML_BITS);
 
     /* Copy Literals */
-    LZ4_wildCopy(*op, *anchor, (*op) + length);
-    *op += length;
+    LZ4_BLINDCOPY(*anchor, *op, length);
 
     /* Encode Offset */
-    LZ4_writeLE16(*op, (U16)(*ip-match)); *op += 2;
+    LZ4_WRITE_LITTLEENDIAN_16(*op,(U16)(*ip-ref));
 
     /* Encode MatchLength */
     length = (int)(matchLength-MINMATCH);
-    if ((limitedOutputBuffer) && (*op + (length>>8) + (1 + LASTLITERALS) > oend)) return 1;   /* Check output limit */
+    if ((limitedOutputBuffer) && (*op + (1 + LASTLITERALS) + (length>>8) > 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);
 
@@ -331,15 +608,16 @@ FORCE_INLINE int LZ4HC_encodeSequence (
 }
 
 
+#define MAX_COMPRESSION_LEVEL 16
 static int LZ4HC_compress_generic (
-    void* ctxvoid,
-    const char* source,
-    char* dest,
-    int inputSize,
-    int maxOutputSize,
-    int compressionLevel,
-    limitedOutput_directive limit
-    )
+                 void* ctxvoid,
+                 const char* source,
+                 char* dest,
+                 int inputSize,
+                 int maxOutputSize,
+                 int compressionLevel,
+                 limitedOutput_directive limit
+                )
 {
     LZ4HC_Data_Structure* ctx = (LZ4HC_Data_Structure*) ctxvoid;
     const BYTE* ip = (const BYTE*) source;
@@ -351,7 +629,7 @@ static int LZ4HC_compress_generic (
     BYTE* op = (BYTE*) dest;
     BYTE* const oend = op + maxOutputSize;
 
-    unsigned maxNbAttempts;
+    const int maxNbAttempts = compressionLevel > MAX_COMPRESSION_LEVEL ? 1 << MAX_COMPRESSION_LEVEL : compressionLevel ? 1<<(compressionLevel-1) : 1<<LZ4HC_DEFAULT_COMPRESSIONLEVEL;
     int   ml, ml2, ml3, ml0;
     const BYTE* ref=NULL;
     const BYTE* start2=NULL;
@@ -362,10 +640,8 @@ static int LZ4HC_compress_generic (
     const BYTE* ref0;
 
 
-    /* init */
-    if (compressionLevel > g_maxCompressionLevel) compressionLevel = g_maxCompressionLevel;
-    if (compressionLevel < 1) compressionLevel = LZ4HC_compressionLevel_default;
-    maxNbAttempts = 1 << (compressionLevel-1);
+    /* Ensure blocks follow each other */
+    if (ip != ctx->end) return 0;
     ctx->end += inputSize;
 
     ip++;
@@ -413,10 +689,10 @@ _Search2:
 
 _Search3:
         /*
-        * Currently we have :
-        * ml2 > ml1, and
-        * ip1+3 <= ip2 (usually < ip1+ml1)
-        */
+         * Currently we have :
+         * ml2 > ml1, and
+         * ip1+3 <= ip2 (usually < ip1+ml1)
+         */
         if ((start2 - ip) < OPTIMAL_ML)
         {
             int correction;
@@ -484,9 +760,9 @@ _Search3:
         }
 
         /*
-        * OK, now we have 3 ascending matches; let's write at least the first one
-        * ip & ref are known; Now for ml
-        */
+         * 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)
@@ -518,6 +794,7 @@ _Search3:
         ml2 = ml3;
 
         goto _Search3;
+
     }
 
     /* Encode Last Literals */
@@ -535,182 +812,73 @@ _Search3:
 }
 
 
-int LZ4_sizeofStateHC(void) { return sizeof(LZ4HC_Data_Structure); }
-
-int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
+int LZ4_compressHC2(const char* source, char* dest, int inputSize, int compressionLevel)
 {
-    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);
-    if (maxDstSize < LZ4_compressBound(srcSize))
-        return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
-    else
-        return LZ4HC_compress_generic (state, 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);
-}
+    void* ctx = LZ4_createHC(source);
+    int result;
+    if (ctx==NULL) return 0;
 
+    result = LZ4HC_compress_generic (ctx, source, dest, inputSize, 0, compressionLevel, noLimit);
 
-
-/**************************************
-*  Streaming Functions
-**************************************/
-/* allocation */
-LZ4_streamHC_t* LZ4_createStreamHC(void) { return (LZ4_streamHC_t*)malloc(sizeof(LZ4_streamHC_t)); }
-int             LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_streamHCPtr); return 0; }
-
-
-/* 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_freeHC(ctx);
+    return result;
 }
 
-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)
-    {
-        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;
-    return dictSize;
-}
+int LZ4_compressHC(const char* source, char* dest, int inputSize) { return LZ4_compressHC2(source, dest, inputSize, 0); }
 
+int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
+{
+    void* ctx = LZ4_createHC(source);
+    int result;
+    if (ctx==NULL) return 0;
 
-/* compression */
+    result = LZ4HC_compress_generic (ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
 
-static void LZ4HC_setExternalDict(LZ4HC_Data_Structure* ctxPtr, const BYTE* newBlock)
-{
-    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);
-    ctxPtr->dictBase  = ctxPtr->base;
-    ctxPtr->base = newBlock - ctxPtr->dictLimit;
-    ctxPtr->end  = newBlock;
-    ctxPtr->nextToUpdate = ctxPtr->dictLimit;   /* match referencing will resume from there */
+    LZ4_freeHC(ctx);
+    return result;
 }
 
-static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
-                                            const char* source, char* dest,
-                                            int inputSize, int maxOutputSize, limitedOutput_directive limit)
+int LZ4_compressHC_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
 {
-    /* auto-init if forgotten */
-    if (ctxPtr->base == NULL)
-        LZ4HC_init (ctxPtr, (const BYTE*) source);
-
-    /* Check overflow */
-    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);
-    }
+    return LZ4_compressHC2_limitedOutput(source, dest, inputSize, maxOutputSize, 0);
+}
 
-    /* Check if blocks follow each other */
-    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))
-        {
-            if (sourceEnd > dictEnd) sourceEnd = dictEnd;
-            ctxPtr->lowLimit = (U32)(sourceEnd - ctxPtr->dictBase);
-            if (ctxPtr->dictLimit - ctxPtr->lowLimit < 4) ctxPtr->lowLimit = ctxPtr->dictLimit;
-        }
-    }
+/*****************************
+   Using external allocation
+*****************************/
+int LZ4_sizeofStateHC() { return sizeof(LZ4HC_Data_Structure); }
 
-    return LZ4HC_compress_generic (ctxPtr, source, dest, inputSize, maxOutputSize, ctxPtr->compressionLevel, limit);
-}
 
-int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
+int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel)
 {
-    if (maxOutputSize < LZ4_compressBound(inputSize))
-        return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
-    else
-        return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
+    if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
+    LZ4_initHC ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
+    return LZ4HC_compress_generic (state, source, dest, inputSize, 0, compressionLevel, noLimit);
 }
 
+int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize)
+{ return LZ4_compressHC2_withStateHC (state, source, dest, inputSize, 0); }
 
-/* dictionary saving */
 
-int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictSize)
+int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
 {
-    LZ4HC_Data_Structure* streamPtr = (LZ4HC_Data_Structure*)LZ4_streamHCPtr;
-    int 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);
-        streamPtr->end = (const BYTE*)safeBuffer + dictSize;
-        streamPtr->base = streamPtr->end - endIndex;
-        streamPtr->dictLimit = endIndex - dictSize;
-        streamPtr->lowLimit = endIndex - dictSize;
-        if (streamPtr->nextToUpdate < streamPtr->dictLimit) streamPtr->nextToUpdate = streamPtr->dictLimit;
-    }
-    return dictSize;
+    if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
+    LZ4_initHC ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
+    return LZ4HC_compress_generic (state, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
 }
 
+int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
+{ return LZ4_compressHC2_limitedOutput_withStateHC (state, source, dest, inputSize, maxOutputSize, 0); }
 
-/***********************************
-*  Deprecated Functions
-***********************************/
-/* 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); }
-int LZ4_compressHC2_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize, int cLevel) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, cLevel); }
-int LZ4_compressHC_withStateHC (void* state, const char* src, char* dst, int srcSize) { return LZ4_compress_HC_extStateHC (state, src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
-int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC_extStateHC (state, src, dst, srcSize, maxDstSize, 0); }
-int LZ4_compressHC2_withStateHC (void* state, const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC_extStateHC(state, src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
-int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int cLevel) { return LZ4_compress_HC_extStateHC(state, src, dst, srcSize, maxDstSize, cLevel); }
-int LZ4_compressHC_continue (LZ4_streamHC_t* ctx, const char* src, char* dst, int srcSize) { return LZ4_compress_HC_continue (ctx, src, dst, srcSize, LZ4_compressBound(srcSize)); }
-int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* ctx, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC_continue (ctx, src, dst, srcSize, maxDstSize); }
-
-
-/* Deprecated streaming functions */
-/* These functions currently generate deprecation warnings */
-int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; }
-
-int LZ4_resetStreamStateHC(void* state, char* inputBuffer)
-{
-    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;
-    return 0;
-}
 
-void* LZ4_createHC (char* inputBuffer)
-{
-    void* hc4 = ALLOCATOR(1, sizeof(LZ4HC_Data_Structure));
-    if (hc4 == NULL) return NULL;   /* not enough memory */
-    LZ4HC_init ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
-    ((LZ4HC_Data_Structure*)hc4)->inputBuffer = (BYTE*)inputBuffer;
-    return hc4;
-}
+/****************************
+   Stream functions
+****************************/
 
-int LZ4_freeHC (void* LZ4HC_Data)
+int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize)
 {
-    FREEMEM(LZ4HC_Data);
-    return (0);
+    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, 0, noLimit);
 }
 
 int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel)
@@ -718,14 +886,12 @@ int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest,
     return LZ4HC_compress_generic (LZ4HC_Data, 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)
+int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize)
 {
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
+    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, 0, limitedOutput);
 }
 
-char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
+int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
 {
-    LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
-    int dictSize = LZ4_saveDictHC((LZ4_streamHC_t*)LZ4HC_Data, (char*)(hc4->inputBuffer), 64 KB);
-    return (char*)(hc4->inputBuffer + dictSize);
+    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/75b00726/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h
index 431f7c8..deb2394 100644
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h
+++ b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h
@@ -1,7 +1,7 @@
 /*
    LZ4 HC - High Compression Mode of LZ4
    Header File
-   Copyright (C) 2011-2015, Yann Collet.
+   Copyright (C) 2011-2014, 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
@@ -28,8 +28,8 @@
    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://fastcompression.blogspot.com/p/lz4.html
+   - LZ4 source repository : http://code.google.com/p/lz4/
 */
 #pragma once
 
@@ -38,150 +38,134 @@
 extern "C" {
 #endif
 
-/*****************************
-*  Includes
-*****************************/
-#include <stddef.h>   /* size_t */
 
+int LZ4_compressHC (const char* source, char* dest, int inputSize);
+/*
+LZ4_compressHC :
+    return : the number of bytes in compressed buffer dest
+             or 0 if compression fails.
+    note : destination buffer must be already allocated.
+        To avoid any problem, size it to handle worst cases situations (input data not compressible)
+        Worst case size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
+*/
 
-/**************************************
-*  Block Compression
-**************************************/
-int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
+int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
 /*
-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.
+LZ4_compress_limitedOutput() :
+    Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
+    If it cannot achieve it, compression will stop, and result of the function will be zero.
+    This function never writes outside of provided output buffer.
+
+    inputSize  : Max supported value is 1 GB
+    maxOutputSize : is maximum allowed size into the destination buffer (which must be already allocated)
+    return : the number of output bytes written in buffer 'dest'
+             or 0 if compression fails.
 */
 
 
+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);
+/*
+    Same functions as above, but with programmable 'compressionLevel'.
+    Recommended values are between 4 and 9, although any value between 0 and 16 will work.
+    'compressionLevel'==0 means use default 'compressionLevel' value.
+    Values above 16 behave the same as 16.
+    Equivalent variants exist for all other compression functions below.
+*/
+
 /* Note :
-   Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
+Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
 */
 
 
+/**************************************
+   Using an external allocation
+**************************************/
 int LZ4_sizeofStateHC(void);
-int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, 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);
+
 /*
-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();
+These functions are provided should you prefer to allocate memory for compression tables with your own allocation methods.
+To know how much memory must be allocated for the compression tables, use :
+int LZ4_sizeofStateHC();
 
-   Allocated memory must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
+Note that tables must be aligned for pointer (32 or 64 bits), otherwise compression will fail (return code 0).
 
-   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.
+The allocated memory can be provided to the compressions functions using 'void* state' parameter.
+LZ4_compress_withStateHC() and LZ4_compress_limitedOutput_withStateHC() are equivalent to previously described functions.
+They just use the externally allocated memory area instead of allocating their own (on stack, or on heap).
 */
 
 
 /**************************************
-*  Streaming Compression
+   Streaming Functions
 **************************************/
-#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.
-
-  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.
-*/
+/* Note : these streaming functions still follows the older model */
+void* LZ4_createHC (const char* inputBuffer);
+int   LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize);
+int   LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize);
+char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
+int   LZ4_freeHC (void* LZ4HC_Data);
 
+int   LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
+int   LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
 
-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.
+These functions allow the compression of dependent blocks, where each block benefits from prior 64 KB within preceding blocks.
+In order to achieve this, it is necessary to start creating the LZ4HC Data Structure, thanks to the function :
+
+void* LZ4_createHC (const char* inputBuffer);
+The result of the function is the (void*) pointer on the LZ4HC Data Structure.
+This pointer will be needed in all other functions.
+If the pointer returned is NULL, then the allocation has failed, and compression must be aborted.
+The only parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
+The input buffer must be already allocated, and size at least 192KB.
+'inputBuffer' will also be the 'const char* source' of the first block.
+
+All blocks are expected to lay next to each other within the input buffer, starting from 'inputBuffer'.
+To compress each block, use either LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue().
+Their behavior are identical to LZ4_compressHC() or LZ4_compressHC_limitedOutput(),
+but require the LZ4HC Data Structure as their first argument, and check that each block starts right after the previous one.
+If next block does not begin immediately after the previous one, the compression will fail (return 0).
+
+When it's no longer possible to lay the next block after the previous one (not enough space left into input buffer), a call to :
+char* LZ4_slideInputBufferHC(void* LZ4HC_Data);
+must be performed. It will typically copy the latest 64KB of input at the beginning of input buffer.
+Note that, for this function to work properly, minimum size of an input buffer must be 192KB.
+==> The memory position where the next input data block must start is provided as the result of the function.
+
+Compression can then resume, using LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue(), as usual.
+
+When compression is completed, a call to LZ4_freeHC() will release the memory used by the LZ4HC Data Structure.
 */
 
-void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
-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);
-
-int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
+int LZ4_sizeofStreamStateHC(void);
+int LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
 
 /*
-  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().
-
-  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.
-
-  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().
-  Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer'.
-*/
+These functions achieve the same result as :
+void* LZ4_createHC (const char* inputBuffer);
 
+They are provided here to allow the user program to allocate memory using its own routines.
 
+To know how much space must be allocated, use LZ4_sizeofStreamStateHC();
+Note also that space must be aligned for pointers (32 or 64 bits).
 
-/**************************************
-*  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 */
-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_createStreamHC() instead") int   LZ4_sizeofStreamStateHC(void);
-LZ4_DEPRECATED("use LZ4_resetStreamHC() instead")  int   LZ4_resetStreamStateHC(void* state, char* inputBuffer);
+Once space is allocated, you must initialize it using : LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
+void* state is a pointer to the space allocated.
+It must be aligned for pointers (32 or 64 bits), and be large enough.
+The parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
+The input buffer must be already allocated, and size at least 192KB.
+'inputBuffer' will also be the 'const char* source' of the first block.
+
+The same space can be re-used multiple times, just by initializing it each time with LZ4_resetStreamState().
+return value of LZ4_resetStreamStateHC() must be 0 is OK.
+Any other value means there was an error (typically, state is not aligned for pointers (32 or 64 bits)).
+*/
 
 
 #if defined (__cplusplus)


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