added sizeof CStream and DStream

lib/compress/zstd_compress.c

@@ -2867,6 +2867,10 @@ size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
     return ZSTD_initCStream_usingDict(zcs, NULL, 0, compressionLevel);
 }
 
+size_t ZSTD_sizeofCStream(const ZSTD_CStream* zcs)
+{
+    return sizeof(zcs) + ZSTD_sizeofCCtx(zcs->zc) + zcs->outBuffSize + zcs->inBuffSize;
+}
 
 /*======   Compression   ======*/
 

lib/decompress/zstd_decompress.c

@@ -980,9 +980,10 @@ size_t ZSTD_decompress(void* dst, size_t dstCapacity, const void* src, size_t sr
 }
 
 
-/*-**********************************
-*   Streaming Decompression API
-************************************/
+/*-**************************************
+*   Advanced Streaming Decompression API
+*   Bufferless and synchronous
+****************************************/
 size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx) { return dctx->expected; }
 
 ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) {
@@ -1382,6 +1383,11 @@ size_t ZSTD_initDStream(ZSTD_DStream* zds)
     return ZSTD_initDStream_usingDict(zds, NULL, 0);
 }
 
+size_t ZSTD_sizeofDStream(const ZSTD_DStream* zds)
+{
+    return sizeof(*zds) + ZSTD_sizeofDCtx(zds->zd) + zds->inBuffSize + zds->outBuffSize;
+}
+
 
 /* *** Decompression *** */
 
@@ -1531,9 +1537,3 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
         return nextSrcSizeHint;
     }
 }
-
-
-
-
-
-

lib/zstd.h

@@ -431,13 +431,15 @@ ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem);
 size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel);
 size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs, const void* dict, size_t dictSize,
                                  ZSTD_parameters params, unsigned long long pledgedSrcSize);
+size_t ZSTD_sizeofCStream(const ZSTD_CStream* zcs);
+
 
 /*======   decompression   ======*/
 
 /* advanced */
 ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem);
 size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize);
-
+size_t ZSTD_sizeofDStream(const ZSTD_DStream* zds);
 
 
 /* ******************************************************************