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Force Working Context Indices Greater than Dict Indices

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This commit is contained in:
W. Felix Handte 2018-05-10 17:17:10 -04:00
parent d005e5daf4
commit 2d598e6fed
1 changed files with 11 additions and 0 deletions
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11
lib/compress/zstd_compress.c
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@ -1229,6 +1229,17 @@ static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
if (attachDict) {
DEBUGLOG(4, "attaching dictionary into context");
cctx->blockState.matchState.dictMatchState = &cdict->matchState;
/* prep working match state so dict matches never have negative indices
* when they are translated to the working context's index space. */
if (cctx->blockState.matchState.window.dictLimit <
(U32)(cdict->matchState.window.nextSrc - cdict->matchState.window.base)) {
cctx->blockState.matchState.window.nextSrc =
cctx->blockState.matchState.window.base +
( cdict->matchState.window.nextSrc
- cdict->matchState.window.base);
ZSTD_window_clear(&cctx->blockState.matchState.window);
}
} else {
DEBUGLOG(4, "copying dictionary into context");
/* copy tables */