From: Nick Terrell <terrelln@fb.com>
Date: Wed, 3 Apr 2019 02:20:52 +0000 (-0700)
Subject: [libzstd] Setting ZSTD_d_maxWindowLog to 0 means default
X-Git-Tag: v1.4.0^2~16^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=00679da22bd6fe89778bc27ff91f4b40c11e0833;p=thirdparty%2Fzstd.git

[libzstd] Setting ZSTD_d_maxWindowLog to 0 means default
---

diff --git a/lib/decompress/zstd_decompress.c b/lib/decompress/zstd_decompress.c
index 142923fe4..aa7f6f580 100644
--- a/lib/decompress/zstd_decompress.c
+++ b/lib/decompress/zstd_decompress.c
@@ -1372,6 +1372,7 @@ size_t ZSTD_DCtx_setParameter(ZSTD_DCtx* dctx, ZSTD_dParameter dParam, int value
     RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong);
     switch(dParam) {
         case ZSTD_d_windowLogMax:
+            if (value == 0) value = ZSTD_WINDOWLOG_LIMIT_DEFAULT;
             CHECK_DBOUNDS(ZSTD_d_windowLogMax, value);
             dctx->maxWindowSize = ((size_t)1) << value;
             return 0;
diff --git a/lib/zstd.h b/lib/zstd.h
index ea2b9a5e4..acc535cff 100644
--- a/lib/zstd.h
+++ b/lib/zstd.h
@@ -852,7 +852,8 @@ typedef enum {
                               * the streaming API will refuse to allocate memory buffer
                               * in order to protect the host from unreasonable memory requirements.
                               * This parameter is only useful in streaming mode, since no internal buffer is allocated in single-pass mode.
-                              * By default, a decompression context accepts window sizes <= (1 << ZSTD_WINDOWLOG_LIMIT_DEFAULT) */
+                              * By default, a decompression context accepts window sizes <= (1 << ZSTD_WINDOWLOG_LIMIT_DEFAULT).
+                              * Special: value 0 means "use default maximum windowLog". */
 
     /* note : additional experimental parameters are also available
      * within the experimental section of the API.