updated ZSTDMT streaming API

ZSTDMT streaming API is now similar
and has same capabilites as single-thread streaming API.
It makes it easier to blend them together.

lib/common/bitstream.h

@@ -75,6 +75,7 @@ extern "C" {
 #define STREAM_ACCUMULATOR_MIN_64  57
 #define STREAM_ACCUMULATOR_MIN    ((U32)(MEM_32bits() ? STREAM_ACCUMULATOR_MIN_32 : STREAM_ACCUMULATOR_MIN_64))
 
+
 /*-******************************************
 *  bitStream encoding API (write forward)
 ********************************************/

lib/common/zstd_internal.h

@@ -305,4 +305,33 @@ MEM_STATIC U32 ZSTD_highbit32(U32 val)
 void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx);
 
 
+/*! ZSTD_compressBegin_internal() :
+ *  innermost initialization function. Private use only.
+ *  expects params to be valid.
+ *  must receive dict, or cdict, or none, but not both.
+ *  @return : 0, or an error code */
+typedef enum { ZSTDb_not_buffered, ZSTDb_buffered } ZSTD_buffered_policy_e;
+size_t ZSTD_compressBegin_internal(ZSTD_CCtx* cctx,
+                             const void* dict, size_t dictSize,
+                             const ZSTD_CDict* cdict,
+                                   ZSTD_parameters params, U64 pledgedSrcSize,
+                                   ZSTD_buffered_policy_e zbuff);
+
+
+/*! ZSTD_initCStream_internal() :
+ *  Private use only. Init streaming operation.
+ *  expects params to be valid.
+ *  must receive dict, or cdict, or none, but not both.
+ *  @return : 0, or an error code */
+size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
+                           const void* dict, size_t dictSize,
+                           const ZSTD_CDict* cdict,
+                           ZSTD_parameters params, U64 pledgedSrcSize);
+
+
+/*! ZSTD_getParamsFromCDict() :
+ *  as the name implies */
+ZSTD_parameters ZSTD_getParamsFromCDict(const ZSTD_CDict* cdict);
+
+
 #endif   /* ZSTD_CCOMMON_H_MODULE */