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make room for reserved "information bit" in frame header

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Yann Collet
2016-06-16 15:38:51 +02:00
parent ec2031e2a7
commit 4948f270b3
2 changed files with 8 additions and 5 deletions
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NEWS
+3 -2
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@@ -5,8 +5,9 @@ New : Visual build scripts, by Christophe Chevalier
New : Support for Sparse File-systems (do not use space for zero-filled sectors)
New : Frame checksum support
New : Support pass-through mode (when using `-df`)
New : API : dictionary files from custom content, by Giuseppe Ottaviano
New : API support for custom malloc/free functions
API : more efficient Dictionary API : `ZSTD_compress_usingCDict()`, `ZSTD_decompress_usingDDict()`
API : create dictionary files from custom content, by Giuseppe Ottaviano
API : support for custom malloc/free functions
New : controllable Dictionary ID
New : Support for skippable frames
lib/decompress/zstd_decompress.c
+5 -3
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@@ -223,8 +223,10 @@ void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx)
// new
1 byte - FrameHeaderDescription :
bit 0-1 : dictID (0, 1, 2 or 4 bytes)
bit 2-4 : reserved (must be zero)
bit 5 : SkippedWindowLog (if 1, WindowLog byte is not present)
bit 2 : checksumFlag
bit 3 : reserved (must be zero)
bit 4 : reserved (unused, can be any value)
bit 5 : Single Segment (if 1, WindowLog byte is not present)
bit 6-7 : FrameContentFieldSize (0, 2, 4, or 8)
if (SkippedWindowLog && !FrameContentFieldsize) FrameContentFieldsize=1;
@@ -365,7 +367,7 @@ size_t ZSTD_getFrameParams(ZSTD_frameParams* fparamsPtr, const void* src, size_t
U32 windowSize = 0;
U32 dictID = 0;
U64 frameContentSize = 0;
if ((fhdByte & 0x18) != 0) return ERROR(frameParameter_unsupported); /* reserved bits */
if ((fhdByte & 0x08) != 0) return ERROR(frameParameter_unsupported); /* reserved bits, which must be zero */
if (!directMode) {
BYTE const wlByte = ip[pos++];
U32 const windowLog = (wlByte >> 3) + ZSTD_WINDOWLOG_ABSOLUTEMIN;