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1 /*
2  *  LZ4 - Fast LZ compression algorithm
3  *  Header File
4  *  Copyright (C) 2011-2016, Yann Collet.
5 
6    BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
7 
8    Redistribution and use in source and binary forms, with or without
9    modification, are permitted provided that the following conditions are
10    met:
11 
12        * Redistributions of source code must retain the above copyright
13    notice, this list of conditions and the following disclaimer.
14        * Redistributions in binary form must reproduce the above
15    copyright notice, this list of conditions and the following disclaimer
16    in the documentation and/or other materials provided with the
17    distribution.
18 
19    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 
31    You can contact the author at :
32     - LZ4 homepage : http://www.lz4.org
33     - LZ4 source repository : https://github.com/lz4/lz4
34 */
35 #ifndef LZ4_H_2983827168210
36 #define LZ4_H_2983827168210
37 
38 #if defined (__cplusplus)
39 extern "C" {
40 #endif
41 
42 /* --- Dependency --- */
43 #include <stddef.h>   /* size_t */
44 
45 
46 /**
47   Introduction
48 
49   LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core,
50   scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
51   multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
52 
53   The LZ4 compression library provides in-memory compression and decompression functions.
54   Compression can be done in:
55     - a single step (described as Simple Functions)
56     - a single step, reusing a context (described in Advanced Functions)
57     - unbounded multiple steps (described as Streaming compression)
58 
59   lz4.h provides block compression functions. It gives full buffer control to user.
60   Decompressing an lz4-compressed block also requires metadata (such as compressed size).
61   Each application is free to encode such metadata in whichever way it wants.
62 
63   An additional format, called LZ4 frame specification (doc/lz4_Frame_format.md),
64   take care of encoding standard metadata alongside LZ4-compressed blocks.
65   If your application requires interoperability, it's recommended to use it.
66   A library is provided to take care of it, see lz4frame.h.
67 */
68 
69 /*^***************************************************************
70 *  Export parameters
71 *****************************************************************/
72 /*
73 *  LZ4_DLL_EXPORT :
74 *  Enable exporting of functions when building a Windows DLL
75 */
76 #if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
77 #  define LZ4LIB_API __declspec(dllexport)
78 #elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
79 #  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.*/
80 #else
81 #  define LZ4LIB_API
82 #endif
83 
84 
85 /*========== Version =========== */
86 #define LZ4_VERSION_MAJOR    1    /* for breaking interface changes  */
87 #define LZ4_VERSION_MINOR    7    /* for new (non-breaking) interface capabilities */
88 #define LZ4_VERSION_RELEASE  5    /* for tweaks, bug-fixes, or development */
89 
90 #define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
91 
92 #define LZ4_LIB_VERSION LZ4_VERSION_MAJOR.LZ4_VERSION_MINOR.LZ4_VERSION_RELEASE
93 #define LZ4_QUOTE(str) #str
94 #define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
95 #define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
96 
97 LZ4LIB_API int LZ4_versionNumber (void);
98 LZ4LIB_API const char* LZ4_versionString (void);
99 
100 
101 /*-************************************
102 *  Tuning parameter
103 **************************************/
104 /*!
105  * LZ4_MEMORY_USAGE :
106  * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
107  * Increasing memory usage improves compression ratio
108  * Reduced memory usage can improve speed, due to cache effect
109  * Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
110  */
111 #define LZ4_MEMORY_USAGE 14
112 
113 
114 /*-************************************
115 *  Simple Functions
116 **************************************/
117 /*! LZ4_compress_default() :
118     Compresses 'sourceSize' bytes from buffer 'source'
119     into already allocated 'dest' buffer of size 'maxDestSize'.
120     Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
121     It also runs faster, so it's a recommended setting.
122     If the function cannot compress 'source' into a more limited 'dest' budget,
123     compression stops *immediately*, and the function result is zero.
124     As a consequence, 'dest' content is not valid.
125     This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
126         sourceSize  : Max supported value is LZ4_MAX_INPUT_VALUE
127         maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
128         return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
129               or 0 if compression fails */
130 LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
131 
132 /*! LZ4_decompress_safe() :
133     compressedSize : is the precise full size of the compressed block.
134     maxDecompressedSize : is the size of destination buffer, which must be already allocated.
135     return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
136              If destination buffer is not large enough, decoding will stop and output an error code (<0).
137              If the source stream is detected malformed, the function will stop decoding and return a negative result.
138              This function is protected against buffer overflow exploits, including malicious data packets.
139              It never writes outside output buffer, nor reads outside input buffer.
140 */
141 LZ4LIB_API int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
142 
143 
144 /*-************************************
145 *  Advanced Functions
146 **************************************/
147 #define LZ4_MAX_INPUT_SIZE        0x7E000000   /* 2 113 929 216 bytes */
148 #define LZ4_COMPRESSBOUND(isize)  ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
149 
150 /*!
151 LZ4_compressBound() :
152     Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
153     This function is primarily useful for memory allocation purposes (destination buffer size).
154     Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
155     Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize)
156         inputSize  : max supported value is LZ4_MAX_INPUT_SIZE
157         return : maximum output size in a "worst case" scenario
158               or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
159 */
160 LZ4LIB_API int LZ4_compressBound(int inputSize);
161 
162 /*!
163 LZ4_compress_fast() :
164     Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
165     The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
166     It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
167     An acceleration value of "1" is the same as regular LZ4_compress_default()
168     Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
169 */
170 LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
171 
172 
173 /*!
174 LZ4_compress_fast_extState() :
175     Same compression function, just using an externally allocated memory space to store compression state.
176     Use LZ4_sizeofState() to know how much memory must be allocated,
177     and allocate it on 8-bytes boundaries (using malloc() typically).
178     Then, provide it as 'void* state' to compression function.
179 */
180 LZ4LIB_API int LZ4_sizeofState(void);
181 LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
182 
183 
184 /*!
185 LZ4_compress_destSize() :
186     Reverse the logic, by compressing as much data as possible from 'source' buffer
187     into already allocated buffer 'dest' of size 'targetDestSize'.
188     This function either compresses the entire 'source' content into 'dest' if it's large enough,
189     or fill 'dest' buffer completely with as much data as possible from 'source'.
190         *sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
191                          New value is necessarily <= old value.
192         return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
193               or 0 if compression fails
194 */
195 LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
196 
197 
198 /*!
199 LZ4_decompress_fast() :
200     originalSize : is the original and therefore uncompressed size
201     return : the number of bytes read from the source buffer (in other words, the compressed size)
202              If the source stream is detected malformed, the function will stop decoding and return a negative result.
203              Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes.
204     note : This function fully respect memory boundaries for properly formed compressed data.
205            It is a bit faster than LZ4_decompress_safe().
206            However, it does not provide any protection against intentionally modified data stream (malicious input).
207            Use this function in trusted environment only (data to decode comes from a trusted source).
208 */
209 LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
210 
211 /*!
212 LZ4_decompress_safe_partial() :
213     This function decompress a compressed block of size 'compressedSize' at position 'source'
214     into destination buffer 'dest' of size 'maxDecompressedSize'.
215     The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached,
216     reducing decompression time.
217     return : the number of bytes decoded in the destination buffer (necessarily <= maxDecompressedSize)
218        Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller.
219              Always control how many bytes were decoded.
220              If the source stream is detected malformed, the function will stop decoding and return a negative result.
221              This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets
222 */
223 LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
224 
225 
226 /*-*********************************************
227 *  Streaming Compression Functions
228 ***********************************************/
229 typedef union LZ4_stream_u LZ4_stream_t;   /* incomplete type (defined later) */
230 
231 /*! LZ4_createStream() and LZ4_freeStream() :
232  *  LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
233  *  LZ4_freeStream() releases its memory.
234  */
235 LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
236 LZ4LIB_API int           LZ4_freeStream (LZ4_stream_t* streamPtr);
237 
238 /*! LZ4_resetStream() :
239  *  An LZ4_stream_t structure can be allocated once and re-used multiple times.
240  *  Use this function to init an allocated `LZ4_stream_t` structure and start a new compression.
241  */
242 LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
243 
244 /*! LZ4_loadDict() :
245  *  Use this function to load a static dictionary into LZ4_stream.
246  *  Any previous data will be forgotten, only 'dictionary' will remain in memory.
247  *  Loading a size of 0 is allowed.
248  *  Return : dictionary size, in bytes (necessarily <= 64 KB)
249  */
250 LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
251 
252 /*! LZ4_compress_fast_continue() :
253  *  Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
254  *  Important : Previous data blocks are assumed to still be present and unmodified !
255  *  'dst' buffer must be already allocated.
256  *  If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
257  *  If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
258  */
259 LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
260 
261 /*! LZ4_saveDict() :
262  *  If previously compressed data block is not guaranteed to remain available at its memory location,
263  *  save it into a safer place (char* safeBuffer).
264  *  Note : you don't need to call LZ4_loadDict() afterwards,
265  *         dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue().
266  *  Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
267  */
268 LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
269 
270 
271 /*-**********************************************
272 *  Streaming Decompression Functions
273 *  Bufferless synchronous API
274 ************************************************/
275 typedef union LZ4_streamDecode_u LZ4_streamDecode_t;   /* incomplete type (defined later) */
276 
277 /* creation / destruction of streaming decompression tracking structure */
278 LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
279 LZ4LIB_API int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
280 
281 /*! LZ4_setStreamDecode() :
282  *  Use this function to instruct where to find the dictionary.
283  *  Setting a size of 0 is allowed (same effect as reset).
284  *  @return : 1 if OK, 0 if error
285  */
286 LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
287 
288 /*!
289 LZ4_decompress_*_continue() :
290     These decoding functions allow decompression of multiple blocks in "streaming" mode.
291     Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
292     In the case of a ring buffers, decoding buffer must be either :
293     - Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
294       In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
295     - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
296       maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
297       In which case, encoding and decoding buffers do not need to be synchronized,
298       and encoding ring buffer can have any size, including small ones ( < 64 KB).
299     - _At least_ 64 KB + 8 bytes + maxBlockSize.
300       In which case, encoding and decoding buffers do not need to be synchronized,
301       and encoding ring buffer can have any size, including larger than decoding buffer.
302     Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
303     and indicate where it is saved using LZ4_setStreamDecode()
304 */
305 LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
306 LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
307 
308 
309 /*! LZ4_decompress_*_usingDict() :
310  *  These decoding functions work the same as
311  *  a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
312  *  They are stand-alone, and don't need an LZ4_streamDecode_t structure.
313  */
314 LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
315 LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
316 
317 
318 /*^**********************************************
319  * !!!!!!   STATIC LINKING ONLY   !!!!!!
320  ***********************************************/
321 /*-************************************
322  *  Private definitions
323  **************************************
324  * Do not use these definitions.
325  * They are exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
326  * Using these definitions will expose code to API and/or ABI break in future versions of the library.
327  **************************************/
328 #define LZ4_HASHLOG   (LZ4_MEMORY_USAGE-2)
329 #define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
330 #define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG)       /* required as macro for static allocation */
331 
332 #if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
333 #include <stdint.h>
334 
335 typedef struct {
336     uint32_t hashTable[LZ4_HASH_SIZE_U32];
337     uint32_t currentOffset;
338     uint32_t initCheck;
339     const uint8_t* dictionary;
340     uint8_t* bufferStart;   /* obsolete, used for slideInputBuffer */
341     uint32_t dictSize;
342 } LZ4_stream_t_internal;
343 
344 typedef struct {
345     const uint8_t* externalDict;
346     size_t extDictSize;
347     const uint8_t* prefixEnd;
348     size_t prefixSize;
349 } LZ4_streamDecode_t_internal;
350 
351 #else
352 
353 typedef struct {
354     unsigned int hashTable[LZ4_HASH_SIZE_U32];
355     unsigned int currentOffset;
356     unsigned int initCheck;
357     const unsigned char* dictionary;
358     unsigned char* bufferStart;   /* obsolete, used for slideInputBuffer */
359     unsigned int dictSize;
360 } LZ4_stream_t_internal;
361 
362 typedef struct {
363     const unsigned char* externalDict;
364     size_t extDictSize;
365     const unsigned char* prefixEnd;
366     size_t prefixSize;
367 } LZ4_streamDecode_t_internal;
368 
369 #endif
370 
371 /*!
372  * LZ4_stream_t :
373  * information structure to track an LZ4 stream.
374  * init this structure before first use.
375  * note : only use in association with static linking !
376  *        this definition is not API/ABI safe,
377  *        and may change in a future version !
378  */
379 #define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
380 #define LZ4_STREAMSIZE     (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
381 union LZ4_stream_u {
382     unsigned long long table[LZ4_STREAMSIZE_U64];
383     LZ4_stream_t_internal internal_donotuse;
384 } ;  /* previously typedef'd to LZ4_stream_t */
385 
386 
387 /*!
388  * LZ4_streamDecode_t :
389  * information structure to track an LZ4 stream during decompression.
390  * init this structure  using LZ4_setStreamDecode (or memset()) before first use
391  * note : only use in association with static linking !
392  *        this definition is not API/ABI safe,
393  *        and may change in a future version !
394  */
395 #define LZ4_STREAMDECODESIZE_U64  4
396 #define LZ4_STREAMDECODESIZE     (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
397 union LZ4_streamDecode_u {
398     unsigned long long table[LZ4_STREAMDECODESIZE_U64];
399     LZ4_streamDecode_t_internal internal_donotuse;
400 } ;   /* previously typedef'd to LZ4_streamDecode_t */
401 
402 
403 /*=************************************
404 *  Obsolete Functions
405 **************************************/
406 /* Deprecation warnings */
407 /* Should these warnings be a problem,
408    it is generally possible to disable them,
409    typically with -Wno-deprecated-declarations for gcc
410    or _CRT_SECURE_NO_WARNINGS in Visual.
411    Otherwise, it's also possible to define LZ4_DISABLE_DEPRECATE_WARNINGS */
412 #ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
413 #  define LZ4_DEPRECATED(message)   /* disable deprecation warnings */
414 #else
415 #  define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
416 #  if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
417 #    define LZ4_DEPRECATED(message) [[deprecated(message)]]
418 #  elif (LZ4_GCC_VERSION >= 405) || defined(__clang__)
419 #    define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
420 #  elif (LZ4_GCC_VERSION >= 301)
421 #    define LZ4_DEPRECATED(message) __attribute__((deprecated))
422 #  elif defined(_MSC_VER)
423 #    define LZ4_DEPRECATED(message) __declspec(deprecated(message))
424 #  else
425 #    pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
426 #    define LZ4_DEPRECATED(message)
427 #  endif
428 #endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
429 
430 /* Obsolete compression functions */
431 LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress               (const char* source, char* dest, int sourceSize);
432 LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
433 LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
434 LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
435 LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
436 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);
437 
438 /* Obsolete decompression functions */
439 /* These function names are completely deprecated and must no longer be used.
440    They are only provided in lz4.c for compatibility with older programs.
441     - LZ4_uncompress is the same as LZ4_decompress_fast
442     - LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
443    These function prototypes are now disabled; uncomment them only if you really need them.
444    It is highly recommended to stop using these prototypes and migrate to maintained ones */
445 /* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
446 /* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
447 
448 /* Obsolete streaming functions; use new streaming interface whenever possible */
449 LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
450 LZ4_DEPRECATED("use LZ4_createStream() instead") int   LZ4_sizeofStreamState(void);
451 LZ4_DEPRECATED("use LZ4_resetStream() instead")  int   LZ4_resetStreamState(void* state, char* inputBuffer);
452 LZ4_DEPRECATED("use LZ4_saveDict() instead")     char* LZ4_slideInputBuffer (void* state);
453 
454 /* Obsolete streaming decoding functions */
455 LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
456 LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
457 
458 
459 #if defined (__cplusplus)
460 }
461 #endif
462 
463 #endif /* LZ4_H_2983827168210 */
464