From: Yann Collet <cyan@fb.com>
Date: Fri, 16 Jun 2017 17:17:50 +0000 (-0700)
Subject: added ZSTD_CCtx_reset
X-Git-Tag: v1.3.0~1^2~17^2~44
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd18c885a38d7cd93fe610c7e647e280198ada50;p=thirdparty%2Fzstd.git

added ZSTD_CCtx_reset
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 1d4f4f5a1..1be0e97b3 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -399,14 +399,14 @@ ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, s
 }
 
 /* Not ready yet ! */
-ZSTDLIB_API size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
+size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize)
 {
     (void)cctx; (void)prefix; (void)prefixSize; /* to be done later */
     if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
     return ERROR(compressionParameter_unsupported);
 }
 
-ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
+size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
 {
     if (cctx->streamStage != zcss_init) return ERROR(stage_wrong);
     cctx->cdict = cdict;
@@ -414,6 +414,13 @@ ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict)
 }
 
 
+void ZSTD_CCtx_reset(ZSTD_CCtx* cctx)
+{
+    cctx->streamStage = zcss_init;
+    cctx->frameContentSize = ZSTD_CONTENTSIZE_UNKNOWN;
+    cctx->cdict = NULL;
+}
+
 /** ZSTD_checkParams() :
     ensure param values remain within authorized range.
     @return : 0, or an error code if one value is beyond authorized range */
diff --git a/lib/zstd.h b/lib/zstd.h
index eb72fc4e5..a19543814 100644
--- a/lib/zstd.h
+++ b/lib/zstd.h
@@ -819,10 +819,11 @@ ZSTDLIB_API size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
 /*! ZSTD_CCtx_reset() :
  *  Return a CCtx to clean state.
  *  Useful after an error, or to interrupt an ongoing compression job and start a new one.
- *  It's possible to modify compression parameters after a reset.
  *  Any internal data not yet flushed is cancelled.
+ *  Dictionary (if any) is dropped, next compression starts with srcSize==unknown by default.
+ *  It's possible to modify compression parameters after a reset.
  */
-ZSTDLIB_API size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx);   /* Not ready yet ! */
+ZSTDLIB_API void ZSTD_CCtx_reset(ZSTD_CCtx* cctx);   /* Not ready yet ! */
 
 
 /*! ZSTD_compress_generic_simpleArgs() :