Merge branch 'ported-upstream'

1 files changed, 359 insertions, 172 deletions

diff --git a/mfbt/lz4.h b/mfbt/lz4.h
index bf6780122..86ca0d59c 100644
--- a/mfbt/lz4.h
+++ b/mfbt/lz4.h
@@ -1,7 +1,8 @@
 /*
-   LZ4 - Fast LZ compression algorithm
-   Header File
-   Copyright (C) 2011-2014, Yann Collet.
+ *  LZ4 - Fast LZ compression algorithm
+ *  Header File
+ *  Copyright (C) 2011-2017, 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
@@ -28,247 +29,433 @@
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
    You can contact the author at :
-   - LZ4 source repository : http://code.google.com/p/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
-
 #if defined (__cplusplus)
 extern "C" {
 #endif
 
+#ifndef LZ4_H_2983827168210
+#define LZ4_H_2983827168210
 
-/**************************************
-   Version
-**************************************/
-#define LZ4_VERSION_MAJOR    1    /* for major interface/format changes  */
-#define LZ4_VERSION_MINOR    2    /* for minor interface/format changes  */
+/* --- 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_DLL_EXPORT :
+*  Enable exporting of functions when building a Windows DLL
+*  LZ4LIB_API :
+*  Control library symbols visibility.
+*/
+#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.*/
+#elif defined(__GNUC__) && (__GNUC__ >= 4)
+#  define LZ4LIB_API __attribute__ ((__visibility__ ("default")))
+#else
+#  define LZ4LIB_API
+#endif
+
+
+/*------   Version   ------*/
+#define LZ4_VERSION_MAJOR    1    /* for breaking interface changes  */
+#define LZ4_VERSION_MINOR    8    /* for new (non-breaking) interface capabilities */
 #define LZ4_VERSION_RELEASE  0    /* for tweaks, bug-fixes, or development */
 
+#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
 
-/**************************************
-   Tuning parameter
+#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);  /**< library version number; to be used when checking dll version */
+LZ4LIB_API const char* LZ4_versionString (void);   /**< library version string; to be used when checking dll version */
+
+
+/*-************************************
+*  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
  * Reduced memory usage can improve speed, due to cache effect
  * Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
  */
-#define LZ4_MEMORY_USAGE 14
-
+#ifndef LZ4_MEMORY_USAGE
+# define LZ4_MEMORY_USAGE 14
+#endif
 
-/**************************************
-   Simple Functions
+/*-************************************
+*  Simple Functions
 **************************************/
-
-int LZ4_compress        (const char* source, char* dest, int inputSize);
-int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxOutputSize);
-
-/*
-LZ4_compress() :
-    Compresses 'inputSize' 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_VALUE
-    return : the number of bytes written in buffer dest
-             or 0 if the compression fails
-
-LZ4_decompress_safe() :
-    compressedSize : is obviously the source size
-    maxOutputSize : is the size of the destination buffer, which must be already allocated.
-    return : the number of bytes decoded in the destination buffer (necessarily <= maxOutputSize)
-             If the destination buffer is not large enough, decoding will stop and output an error code (<0).
+/*! 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 */
+LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
+
+/*! 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).
              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 :
-             it never writes outside of output buffer, and never reads outside of input buffer.
-             Therefore, it is protected against malicious data packets.
-*/
-
-
-/*
-Note :
-    Should you prefer to explicitly allocate compression-table memory using your own allocation method,
-    use the streaming functions provided below, simply reset the memory area between each call to LZ4_compress_continue()
+             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
+/*-************************************
+*  Advanced Functions
 **************************************/
 #define LZ4_MAX_INPUT_SIZE        0x7E000000   /* 2 113 929 216 bytes */
-#define LZ4_COMPRESSBOUND(isize)  ((unsigned int)(isize) > (unsigned int)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
+#define LZ4_COMPRESSBOUND(isize)  ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
 
-/*
+/*!
 LZ4_compressBound() :
-    Provides the maximum size that LZ4 may output in a "worst case" scenario (input data not compressible)
-    primarily useful for memory allocation of output buffer.
-    macro is also provided when result needs to be evaluated at compilation (such as stack memory allocation).
-
-    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)
+    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).
+    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)
+*/
+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.
+    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.
 */
-int LZ4_compressBound(int isize);
+LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
 
 
-/*
-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 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 the compression fails
+/*!
+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.
+*/
+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'.
+    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
 */
-int LZ4_compress_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
+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)
-             If the source stream is malformed, the function will stop decoding and return a negative result.
+             If the source stream is detected malformed, the function will stop decoding and return a negative result.
              Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes.
-    note : This function is a bit faster than LZ4_decompress_safe()
-           It provides fast decompression and fully respect memory boundaries for properly formed compressed data.
-           It does not provide full protection against intentionnally modified data stream.
-           Use this function in a trusted environment (data to decode comes from a trusted source).
+    note : This function fully respect memory boundaries for properly formed compressed data.
+           It is a bit faster than LZ4_decompress_safe().
+           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 output buffer 'dest' of size 'maxOutputSize'.
+    into destination buffer 'dest' of size 'maxDecompressedSize'.
     The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached,
     reducing decompression time.
-    return : the number of bytes decoded in the destination buffer (necessarily <= maxOutputSize)
+    return : the number of bytes decoded in the destination buffer (necessarily <= maxDecompressedSize)
        Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller.
              Always control how many bytes were decoded.
              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 maxOutputSize);
+LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
 
 
-/***********************************************
-   Experimental Streaming Compression Functions
+/*-*********************************************
+*  Streaming Compression Functions
 ***********************************************/
+typedef union LZ4_stream_u LZ4_stream_t;   /* incomplete type (defined later) */
 
-#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 : set this structure content to zero before first use !
- */
-typedef struct { unsigned int table[LZ4_STREAMSIZE_U32]; } LZ4_stream_t;
-
-/*
- * If you prefer dynamic allocation methods,
- * LZ4_createStream
- * provides a pointer (void*) towards an initialized LZ4_stream_t structure.
- * LZ4_free just frees it.
+/*! LZ4_createStream() and LZ4_freeStream() :
+ *  LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
+ *  LZ4_freeStream() releases its memory.
  */
-void* LZ4_createStream();
-int   LZ4_free (void* LZ4_stream);
-
+LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
+LZ4LIB_API int           LZ4_freeStream (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 (same effect as init).
- * Return : 1 if OK, 0 if error
+/*! 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.
  */
-int LZ4_loadDict (void* LZ4_stream, const char* dictionary, int dictSize);
+LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
 
-/*
- * 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.
+/*! 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_compress_continue (void* 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.
+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 remain present and unmodified !
+ *  'dst' buffer must be already allocated.
+ *  If dstCapacity >= 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 @return==0.
+ *  After an error, the stream status is invalid, it can only be reset or freed.
  */
-int LZ4_compress_limitedOutput_continue (void* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 
-/*
- * LZ4_saveDict
- * If previously compressed data block is not guaranteed to remain at its previous memory location
- * save it into a safe place (char* safeBuffer)
- * Note : you don't need to call LZ4_loadDict() afterwards,
- *        dictionary is immediately usable, you can therefore call again LZ4_compress_continue()
- * Return : 1 if OK, 0 if error
- * Note : any dictSize > 64 KB will be interpreted as 64KB.
+/*! LZ4_saveDict() :
+ *  If previously compressed data block is not guaranteed to remain available at its current memory location,
+ *  save it into a safer place (char* safeBuffer).
+ *  Note : it's not necessary to call LZ4_loadDict() after LZ4_saveDict(), dictionary is immediately usable.
+ *  @return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
  */
-int LZ4_saveDict (void* LZ4_stream, char* safeBuffer, int dictSize);
+LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
 
 
-/************************************************
-  Experimental Streaming Decompression Functions
+/*-**********************************************
+*  Streaming Decompression Functions
+*  Bufferless synchronous API
 ************************************************/
+typedef union LZ4_streamDecode_u LZ4_streamDecode_t;   /* incomplete type (defined later) */
 
-#define LZ4_STREAMDECODESIZE_U32 4
-#define LZ4_STREAMDECODESIZE     (LZ4_STREAMDECODESIZE_U32 * sizeof(unsigned int))
-/*
- * LZ4_streamDecode_t
- * information structure to track an LZ4 stream.
- * important : set this structure content to zero before first use !
+/*! LZ4_createStreamDecode() and LZ4_freeStreamDecode() :
+ *  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
  */
-typedef struct { unsigned int table[LZ4_STREAMDECODESIZE_U32]; } LZ4_streamDecode_t;
+LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
+
+/*! 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 :
+ *  - 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()
+*/
+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);
 
-/*
- * If you prefer dynamic allocation methods,
- * LZ4_createStreamDecode()
- * provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure.
- * LZ4_free just frees it.
+
+/*! 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.
  */
-void* LZ4_createStreamDecode();
-int   LZ4_free (void* LZ4_stream);   /* yes, it's the same one as for compression */
+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;
 
-/*
-*_continue() :
-    These decoding functions allow decompression of multiple blocks in "streaming" mode.
-    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 it stands using LZ4_setDictDecode()
-*/
-int LZ4_decompress_safe_continue (void* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize);
-int LZ4_decompress_fast_continue (void* LZ4_streamDecode, const char* source, char* dest, int originalSize);
+#endif
 
-/*
- * LZ4_setDictDecode
- * Use this function to instruct where to find the dictionary.
- * 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
+/*!
+ * 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,
+ *        it may change in a future version !
  */
-int LZ4_setDictDecode (void* LZ4_streamDecode, const char* dictionary, int dictSize);
+#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 */
 
 
-/*
-Advanced decoding functions :
-*_usingDict() :
-    These decoding functions work the same as
-    a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
-    all together into a single function call.
-    It doesn't use nor update an LZ4_streamDecode_t structure.
-*/
-int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize);
-int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
+/*-************************************
+*  Obsolete Functions
+**************************************/
 
+/*! Deprecation warnings
+   Should deprecation warnings be a problem,
+   it is generally possible to disable them,
+   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 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))
+#  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_DISABLE_DEPRECATE_WARNINGS */
+
+/* Obsolete compression functions */
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress               (const char* source, char* dest, int sourceSize);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
+LZ4LIB_API 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 */
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast() instead") int LZ4_uncompress (const char* source, char* dest, int outputSize);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe() instead") int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
+
+/* Obsolete streaming functions; use new streaming interface whenever possible */
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") int   LZ4_sizeofStreamState(void);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStream() instead")  int   LZ4_resetStreamState(void* state, char* inputBuffer);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDict() instead")     char* LZ4_slideInputBuffer (void* state);
+
+/* Obsolete streaming decoding functions */
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
+LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
+
+#endif /* LZ4_H_2983827168210 */
 
 
 #if defined (__cplusplus)