From: Bimba Shrestha <bimbashrestha@fb.com>
Date: Thu, 11 Jun 2020 20:48:57 +0000 (-0700)
Subject: adding dedicatedDictSearch cParams helper methods
X-Git-Tag: v1.4.7~81^2~45
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e36a373df43dbb7fd9868003a8b442f3e4fb8af0;p=thirdparty%2Fzstd.git

adding dedicatedDictSearch cParams helper methods
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index dac2bf5dc..b7d7bcd02 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -864,6 +864,9 @@ ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long lo
     return 0;
 }
 
+static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize);
+static int ZSTD_dedicatedDictSearch_isSupported(int const compressionLevel, size_t const dictSize);
+
 /**
  * Initializes the local dict using the requested parameters.
  * NOTE: This does not use the pledged src size, because it may be used for more
@@ -4356,6 +4359,19 @@ ZSTD_dedicatedDictSearch_defaultCParameters[4][ZSTD_MAX_CLEVEL+1] = {
 },
 };
 
+static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize)
+{
+    size_t const tableID = (dictSize <= 256 KB) + (dictSize <= 128 KB) + (dictSize <= 16 KB);
+    size_t const row = compressionLevel;
+    return ZSTD_dedicatedDictSearch_defaultCParameters[tableID][row];
+}
+
+static int ZSTD_dedicatedDictSearch_isSupported(int const compressionLevel, size_t const dictSize)
+{
+    ZSTD_compressionParameters const cParams = ZSTD_dedicatedDictSearch_getCParams(compressionLevel, dictSize);
+    return (cParams.strategy >= ZSTD_greedy) && (cParams.strategy <= ZSTD_lazy2);
+}
+
 /*! ZSTD_getCParams_internal() :
  * @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
  *  Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.