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Add Option to Make lz4frame_static.h Functions Visible in Shared Objects

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In some contexts, *cough*like at facebook*cough*, dynamic linking is used in
contexts which aren't truly dynamic. That is, the guarantee is maintained that
a program will only ever execute against the library version it was compiled
to interact with.

For those situations, introduce a compile-time flag that overrides hiding
these unstable APIs in shared objects.
This commit is contained in:
W. Felix Handte 2018-01-08 14:46:22 -05:00
parent 0b203b04f6
commit ebef34fe79
1 changed files with 27 additions and 16 deletions
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23
lib/lz4frame_static.h
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@ -43,7 +43,15 @@ extern "C" {
/* lz4frame_static.h should be used solely in the context of static linking. /* lz4frame_static.h should be used solely in the context of static linking.
* It contains definitions which are not stable and may change in the future. * It contains definitions which are not stable and may change in the future.
* Never use it in the context of DLL linking. * Never use it in the context of DLL linking.
*
* Defining LZ4F_PUBLISH_STATIC_FUNCTIONS allows one to override this. Use at
* your own risk.
*/ */
#ifdef LZ4F_PUBLISH_STATIC_FUNCTIONS
#define LZ4FLIB_STATIC_API LZ4FLIB_API
#else
#define LZ4FLIB_STATIC_API
#endif
/* --- Dependency --- */ /* --- Dependency --- */
@ -79,7 +87,7 @@ extern "C" {
/* enum list is exposed, to handle specific errors */ /* enum list is exposed, to handle specific errors */
typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM) } LZ4F_errorCodes; typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM) } LZ4F_errorCodes;
LZ4F_errorCodes LZ4F_getErrorCode(size_t functionResult); LZ4FLIB_STATIC_API LZ4F_errorCodes LZ4F_getErrorCode(size_t functionResult);
@ -93,8 +101,8 @@ typedef struct LZ4F_CDict_s LZ4F_CDict;
* LZ4_createCDict() will create a digested dictionary, ready to start future compression operations without startup delay. * LZ4_createCDict() will create a digested dictionary, ready to start future compression operations without startup delay.
* LZ4_CDict can be created once and shared by multiple threads concurrently, since its usage is read-only. * LZ4_CDict can be created once and shared by multiple threads concurrently, since its usage is read-only.
* `dictBuffer` can be released after LZ4_CDict creation, since its content is copied within CDict */ * `dictBuffer` can be released after LZ4_CDict creation, since its content is copied within CDict */
LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize); LZ4FLIB_STATIC_API LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize);
void LZ4F_freeCDict(LZ4F_CDict* CDict); LZ4FLIB_STATIC_API void LZ4F_freeCDict(LZ4F_CDict* CDict);
/*! LZ4_compressFrame_usingCDict() : /*! LZ4_compressFrame_usingCDict() :
@ -106,7 +114,8 @@ void LZ4F_freeCDict(LZ4F_CDict* CDict);
* but it's not recommended, as it's the only way to provide dictID in the frame header. * but it's not recommended, as it's the only way to provide dictID in the frame header.
* @return : number of bytes written into dstBuffer. * @return : number of bytes written into dstBuffer.
* or an error code if it fails (can be tested using LZ4F_isError()) */ * or an error code if it fails (can be tested using LZ4F_isError()) */
size_t LZ4F_compressFrame_usingCDict(void* dst, size_t dstCapacity, LZ4FLIB_STATIC_API size_t LZ4F_compressFrame_usingCDict(
void* dst, size_t dstCapacity,
const void* src, size_t srcSize, const void* src, size_t srcSize,
const LZ4F_CDict* cdict, const LZ4F_CDict* cdict,
const LZ4F_preferences_t* preferencesPtr); const LZ4F_preferences_t* preferencesPtr);
@ -119,7 +128,8 @@ size_t LZ4F_compressFrame_usingCDict(void* dst, size_t dstCapacity,
* however, it's the only way to provide dictID in the frame header. * however, it's the only way to provide dictID in the frame header.
* @return : number of bytes written into dstBuffer for the header, * @return : number of bytes written into dstBuffer for the header,
* or an error code (which can be tested using LZ4F_isError()) */ * or an error code (which can be tested using LZ4F_isError()) */
size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctx, LZ4FLIB_STATIC_API size_t LZ4F_compressBegin_usingCDict(
LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity, void* dstBuffer, size_t dstCapacity,
const LZ4F_CDict* cdict, const LZ4F_CDict* cdict,
const LZ4F_preferences_t* prefsPtr); const LZ4F_preferences_t* prefsPtr);
@ -129,7 +139,8 @@ size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctx,
* Same as LZ4F_decompress(), using a predefined dictionary. * Same as LZ4F_decompress(), using a predefined dictionary.
* Dictionary is used "in place", without any preprocessing. * Dictionary is used "in place", without any preprocessing.
* It must remain accessible throughout the entire frame decoding. */ * It must remain accessible throughout the entire frame decoding. */
size_t LZ4F_decompress_usingDict(LZ4F_dctx* dctxPtr, LZ4FLIB_STATIC_API size_t LZ4F_decompress_usingDict(
LZ4F_dctx* dctxPtr,
void* dstBuffer, size_t* dstSizePtr, void* dstBuffer, size_t* dstSizePtr,
const void* srcBuffer, size_t* srcSizePtr, const void* srcBuffer, size_t* srcSizePtr,
const void* dict, size_t dictSize, const void* dict, size_t dictSize,