Add LZ4LIB_API

It's based on Zstandard's ZSTDLIB_API.

See also: https://github.com/Cyan4973/lz4/issues/216#issuecomment-226245432

Deprecated functions aren't LZ4LIB_API targets. Because we don't need to
export deprecated functions from now.

There are same LZ4LIB_API definitions in each header files instead of
including a common header file because LZ4_DEPRECATED is defined so.

4 files changed, 116 insertions, 66 deletions

diff --git a/lib/Makefile b/lib/Makefile
index b5352a0c..a653b658 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -43,7 +43,7 @@ LIBVER := $(shell echo $(LIBVER_SCRIPT))
 
 DESTDIR?=
 PREFIX ?= /usr/local
-CPPFLAGS= -DXXH_NAMESPACE=LZ4_
+CPPFLAGS= -DXXH_NAMESPACE=LZ4_ -DLZ4_DLL_EXPORT=1
 CFLAGS ?= -O3
 CFLAGS += -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wcast-qual -Wstrict-prototypes
 FLAGS   = $(CPPFLAGS) $(CFLAGS) $(LDFLAGS)
diff --git a/lib/lz4.h b/lib/lz4.h
index ba6d70bc..dfe6f2a3 100644
--- a/lib/lz4.h
+++ b/lib/lz4.h
@@ -48,6 +48,23 @@ extern "C" {
  * 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
+*/
+#if defined(_WIN32)
+#  if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
+#    define LZ4LIB_API __declspec(dllexport)
+#  else
+#    define LZ4LIB_API __declspec(dllimport)
+#  endif
+#else
+#  define LZ4LIB_API
+#endif
+
 /*-************************************
 *  Version
 **************************************/
@@ -56,13 +73,13 @@ extern "C" {
 #define LZ4_VERSION_RELEASE  2    /* 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);
+LZ4LIB_API int LZ4_versionNumber (void);
 
 #define LZ4_LIB_VERSION LZ4_VERSION_MAJOR.LZ4_VERSION_MINOR.LZ4_VERSION_RELEASE
 #define LZ4_QUOTE(str) #str
 #define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
 #define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
-const char* LZ4_versionString (void);
+LZ4LIB_API const char* LZ4_versionString (void);
 
 
 /*-************************************
@@ -82,8 +99,8 @@ const char* LZ4_versionString (void);
 *  Simple Functions
 **************************************/
 
-int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
-int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
+LZ4LIB_API int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
 
 /*
 LZ4_compress_default() :
@@ -127,7 +144,7 @@ LZ4_compressBound() :
         return : maximum output size in a "worst case" scenario
               or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
 */
-int LZ4_compressBound(int inputSize);
+LZ4LIB_API int LZ4_compressBound(int inputSize);
 
 /*!
 LZ4_compress_fast() :
@@ -137,7 +154,7 @@ LZ4_compress_fast() :
     An acceleration value of "1" is the same as regular LZ4_compress_default()
     Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
 */
-int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
+LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
 
 
 /*!
@@ -147,8 +164,8 @@ LZ4_compress_fast_extState() :
     and allocate it on 8-bytes boundaries (using malloc() typically).
     Then, provide it as 'void* state' to compression function.
 */
-int LZ4_sizeofState(void);
-int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
+LZ4LIB_API int LZ4_sizeofState(void);
+LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
 
 
 /*!
@@ -162,7 +179,7 @@ LZ4_compress_destSize() :
         return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
               or 0 if compression fails
 */
-int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
+LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
 
 
 /*!
@@ -176,7 +193,7 @@ LZ4_decompress_fast() :
            However, it does not provide any protection against intentionally modified data stream (malicious input).
            Use this function in trusted environment only (data to decode comes from a trusted source).
 */
-int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
+LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
 
 /*!
 LZ4_decompress_safe_partial() :
@@ -190,7 +207,7 @@ LZ4_decompress_safe_partial() :
              If the source stream is detected malformed, the function will stop decoding and return a negative result.
              This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets
 */
-int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
 
 
 /*-*********************************************
@@ -210,15 +227,15 @@ typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
 /*! LZ4_resetStream() :
  *  Use this function to init an allocated `LZ4_stream_t` structure
  */
-void LZ4_resetStream (LZ4_stream_t* streamPtr);
+LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
 
 /*! LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
  *  LZ4_freeStream() releases its memory.
  *  In the context of a DLL (liblz4), please use these methods rather than the static struct.
  *  They are more future proof, in case of a change of `LZ4_stream_t` size.
  */
-LZ4_stream_t* LZ4_createStream(void);
-int           LZ4_freeStream (LZ4_stream_t* streamPtr);
+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.
@@ -226,7 +243,7 @@ int           LZ4_freeStream (LZ4_stream_t* streamPtr);
  *  Loading a size of 0 is allowed.
  *  Return : dictionary size, in bytes (necessarily <= 64 KB)
  */
-int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
+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.
@@ -235,7 +252,7 @@ int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize)
  *  If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
  *  If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
  */
-int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
+LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
 
 /*! LZ4_saveDict() :
  *  If previously compressed data block is not guaranteed to remain available at its memory location,
@@ -244,7 +261,7 @@ int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char*
  *         dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue().
  *  Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
  */
-int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
+LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
 
 
 /*-**********************************************
@@ -264,15 +281,15 @@ typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_strea
  * 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);
+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
  */
-int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
+LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
 
 /*
 *_continue() :
@@ -291,8 +308,8 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
     Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
     and indicate where it is saved using LZ4_setStreamDecode()
 */
-int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
-int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
+LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
+LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
 
 
 /*
@@ -302,8 +319,8 @@ Advanced decoding functions :
     a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
     They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
 */
-int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
-int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
+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);
 
 
 /*=************************************
@@ -333,12 +350,12 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
 
 /* Obsolete compression functions */
 /* These functions will generate warnings in a future release */
-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);
+LZ4LIB_API int LZ4_compress               (const char* source, char* dest, int sourceSize);
+LZ4LIB_API int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
+LZ4LIB_API int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
+LZ4LIB_API int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4LIB_API int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
+LZ4LIB_API 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.
diff --git a/lib/lz4frame.h b/lib/lz4frame.h
index 6a1f9872..d1cfa0cf 100644
--- a/lib/lz4frame.h
+++ b/lib/lz4frame.h
@@ -49,14 +49,30 @@ extern "C" {
 **************************************/
 #include <stddef.h>   /* size_t */
 
+/*-***************************************************************
+*  Export parameters
+*****************************************************************/
+/*!
+*  LZ4_DLL_EXPORT :
+*  Enable exporting of functions when building a Windows DLL
+*/
+#if defined(_WIN32)
+#  if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
+#    define LZ4LIB_API __declspec(dllexport)
+#  else
+#    define LZ4LIB_API __declspec(dllimport)
+#  endif
+#else
+#  define LZ4LIB_API
+#endif
 
 /*-************************************
 *  Error management
 **************************************/
 typedef size_t LZ4F_errorCode_t;
 
-unsigned    LZ4F_isError(LZ4F_errorCode_t code);
-const char* LZ4F_getErrorName(LZ4F_errorCode_t code);   /* return error code string; useful for debugging */
+LZ4LIB_API unsigned    LZ4F_isError(LZ4F_errorCode_t code);
+LZ4LIB_API const char* LZ4F_getErrorName(LZ4F_errorCode_t code);   /* return error code string; useful for debugging */
 
 
 /*-************************************
@@ -128,7 +144,7 @@ typedef struct {
 /*-*********************************
 *  Simple compression function
 ***********************************/
-size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
+LZ4LIB_API size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
 
 /*!LZ4F_compressFrame() :
  * Compress an entire srcBuffer into a valid LZ4 frame, as defined by specification v1.5.1
@@ -139,7 +155,7 @@ size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* prefere
  * The result of the function is the number of bytes written into dstBuffer.
  * The function outputs an error code if it fails (can be tested using LZ4F_isError())
  */
-size_t LZ4F_compressFrame(void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
+LZ4LIB_API size_t LZ4F_compressFrame(void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
 
 
 
@@ -156,8 +172,8 @@ typedef struct {
 /* Resource Management */
 
 #define LZ4F_VERSION 100
-LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* cctxPtr, unsigned version);
-LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t cctx);
+LZ4LIB_API LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* cctxPtr, unsigned version);
+LZ4LIB_API LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t cctx);
 /* LZ4F_createCompressionContext() :
  * The first thing to do is to create a compressionContext object, which will be used in all compression operations.
  * This is achieved using LZ4F_createCompressionContext(), which takes as argument a version and an LZ4F_preferences_t structure.
@@ -170,7 +186,7 @@ LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t cctx);
 
 /* Compression */
 
-size_t LZ4F_compressBegin(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* prefsPtr);
+LZ4LIB_API size_t LZ4F_compressBegin(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* prefsPtr);
 /* LZ4F_compressBegin() :
  * will write the frame header into dstBuffer.
  * dstBuffer must be large enough to accommodate a header (dstMaxSize). Maximum header size is 15 bytes.
@@ -179,7 +195,7 @@ size_t LZ4F_compressBegin(LZ4F_compressionContext_t cctx, void* dstBuffer, size_
  * or an error code (can be tested using LZ4F_isError())
  */
 
-size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
+LZ4LIB_API size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
 /* LZ4F_compressBound() :
  * Provides the minimum size of Dst buffer given srcSize to handle worst case situations.
  * Different preferences can produce different results.
@@ -187,7 +203,7 @@ size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
  * This function includes frame termination cost (4 bytes, or 8 if frame checksum is enabled)
  */
 
-size_t LZ4F_compressUpdate(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* cOptPtr);
+LZ4LIB_API size_t LZ4F_compressUpdate(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* cOptPtr);
 /* LZ4F_compressUpdate()
  * LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary.
  * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case.
@@ -199,7 +215,7 @@ size_t LZ4F_compressUpdate(LZ4F_compressionContext_t cctx, void* dstBuffer, size
  * The function outputs an error code if it fails (can be tested using LZ4F_isError())
  */
 
-size_t LZ4F_flush(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr);
+LZ4LIB_API size_t LZ4F_flush(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr);
 /* LZ4F_flush()
  * Should you need to generate compressed data immediately, without waiting for the current block to be filled,
  * you can call LZ4_flush(), which will immediately compress any remaining data buffered within cctx.
@@ -210,7 +226,7 @@ size_t LZ4F_flush(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMax
  * The function outputs an error code if it fails (can be tested using LZ4F_isError())
  */
 
-size_t LZ4F_compressEnd(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr);
+LZ4LIB_API size_t LZ4F_compressEnd(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr);
 /* LZ4F_compressEnd()
  * When you want to properly finish the compressed frame, just call LZ4F_compressEnd().
  * It will flush whatever data remained within compressionContext (like LZ4_flush())
@@ -245,8 +261,8 @@ typedef struct {
  * The result of LZ4F_freeDecompressionContext() is indicative of the current state of decompressionContext when being released.
  * That is, it should be == 0 if decompression has been completed fully and correctly.
  */
-LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_decompressionContext_t* dctxPtr, unsigned version);
-LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_decompressionContext_t dctx);
+LZ4LIB_API LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_decompressionContext_t* dctxPtr, unsigned version);
+LZ4LIB_API LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_decompressionContext_t dctx);
 
 
 /*======   Decompression   ======*/
@@ -263,9 +279,9 @@ LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_decompressionContext_t dctx)
  *                        (typically, when there is not enough src bytes to fully decode the frame header)
  * Decompression is expected to resume from where it stopped (srcBuffer + *srcSizePtr)
  */
-size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t dctx,
-                         LZ4F_frameInfo_t* frameInfoPtr,
-                         const void* srcBuffer, size_t* srcSizePtr);
+LZ4LIB_API size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t dctx,
+                                    LZ4F_frameInfo_t* frameInfoPtr,
+                                    const void* srcBuffer, size_t* srcSizePtr);
 
 /*!LZ4F_decompress() :
  * Call this function repetitively to regenerate data compressed within srcBuffer.
@@ -291,10 +307,10 @@ size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t dctx,
  *
  * After a frame is fully decoded, dctx can be used again to decompress another frame.
  */
-size_t LZ4F_decompress(LZ4F_decompressionContext_t dctx,
-                       void* dstBuffer, size_t* dstSizePtr,
-                       const void* srcBuffer, size_t* srcSizePtr,
-                       const LZ4F_decompressOptions_t* dOptPtr);
+LZ4LIB_API size_t LZ4F_decompress(LZ4F_decompressionContext_t dctx,
+                                  void* dstBuffer, size_t* dstSizePtr,
+                                  const void* srcBuffer, size_t* srcSizePtr,
+                                  const LZ4F_decompressOptions_t* dOptPtr);
 
 
 
diff --git a/lib/lz4hc.h b/lib/lz4hc.h
index 75eed19f..9ce9e4d8 100644
--- a/lib/lz4hc.h
+++ b/lib/lz4hc.h
@@ -44,6 +44,23 @@ extern "C" {
 *****************************/
 #include <stddef.h>   /* size_t */
 
+/*-***************************************************************
+*  Export parameters
+*****************************************************************/
+/*!
+*  LZ4_DLL_EXPORT :
+*  Enable exporting of functions when building a Windows DLL
+*/
+#if defined(_WIN32)
+#  if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
+#    define LZ4LIB_API __declspec(dllexport)
+#  else
+#    define LZ4LIB_API __declspec(dllimport)
+#  endif
+#else
+#  define LZ4LIB_API
+#endif
+
 
 #define LZ4HC_MIN_CLEVEL        3
 #define LZ4HC_DEFAULT_CLEVEL    9
@@ -64,7 +81,7 @@ LZ4_compress_HC() :
       @return : the number of bytes written into buffer 'dst'
              or 0 if compression fails.
 */
-int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
+LZ4LIB_API int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
 
 
 /* Note :
@@ -84,8 +101,8 @@ LZ4_compress_HC_extStateHC() :
    LZ4_compress_HC_extStateHC() is equivalent to previously described function.
    It just uses externally allocated memory for stateHC.
 */
-int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
-int LZ4_sizeofStateHC(void);
+LZ4LIB_API int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
+LZ4LIB_API int LZ4_sizeofStateHC(void);
 
 
 /*-************************************
@@ -111,15 +128,15 @@ typedef struct { size_t table[LZ4_STREAMHCSIZE_SIZET]; } LZ4_streamHC_t;
   If you use LZ4 as a DLL, use these functions instead of static structure allocation,
   to avoid size mismatch between different versions.
 */
-LZ4_streamHC_t* LZ4_createStreamHC(void);
-int             LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
+LZ4LIB_API LZ4_streamHC_t* LZ4_createStreamHC(void);
+LZ4LIB_API int             LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
 
-void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
-int  LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
+LZ4LIB_API void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
+LZ4LIB_API int  LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
 
-int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
+LZ4LIB_API int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
 
-int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
+LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
 
 /*
   These functions compress data in successive blocks of any size, using previous blocks as dictionary.
@@ -168,16 +185,16 @@ int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSi
 
 /* deprecated compression functions */
 /* these functions will trigger warning messages in future releases */
-int LZ4_compressHC                (const char* source, char* dest, int inputSize);
-int LZ4_compressHC_limitedOutput  (const char* source, char* dest, int inputSize, int maxOutputSize);
+LZ4LIB_API int LZ4_compressHC                (const char* source, char* dest, int inputSize);
+LZ4LIB_API int LZ4_compressHC_limitedOutput  (const char* source, char* dest, int inputSize, int maxOutputSize);
 LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
 LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-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);
+LZ4LIB_API int LZ4_compressHC_withStateHC               (void* state, const char* source, char* dest, int inputSize);
+LZ4LIB_API int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
 LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
 LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-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);
+LZ4LIB_API int LZ4_compressHC_continue               (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
+LZ4LIB_API int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
 
 /* Deprecated Streaming functions using older model; should no longer be used */
 LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);