added test case
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@ -82,7 +82,7 @@ unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize);
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</b><p> `src` should point to the start of a ZSTD encoded frame.
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`srcSize` must be at least as large as the frame header.
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hint : any size >= `ZSTD_frameHeaderSize_max` is large enough.
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@return : - decompressed size of the frame in `src`, if known
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@return : - decompressed size of `src` frame content, if known
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- ZSTD_CONTENTSIZE_UNKNOWN if the size cannot be determined
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- ZSTD_CONTENTSIZE_ERROR if an error occurred (e.g. invalid magic number, srcSize too small)
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note 1 : a 0 return value means the frame is valid but "empty".
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@ -92,7 +92,8 @@ unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize);
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Optionally, application can rely on some implicit limit,
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as ZSTD_decompress() only needs an upper bound of decompressed size.
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(For example, data could be necessarily cut into blocks <= 16 KB).
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note 3 : decompressed size is always present when compression is done with ZSTD_compress()
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note 3 : decompressed size is always present when compression is completed using single-pass functions,
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such as ZSTD_compress(), ZSTD_compressCCtx() ZSTD_compress_usingDict() or ZSTD_compress_usingCDict().
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note 4 : decompressed size can be very large (64-bits value),
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potentially larger than what local system can handle as a single memory segment.
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In which case, it's necessary to use streaming mode to decompress data.
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@ -107,8 +108,7 @@ unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize);
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Both functions work the same way, but ZSTD_getDecompressedSize() blends
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"empty", "unknown" and "error" results to the same return value (0),
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while ZSTD_getFrameContentSize() gives them separate return values.
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`src` is the start of a zstd compressed frame.
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@return : content size to be decompressed, as a 64-bits value _if known and not empty_, 0 otherwise.
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@return : decompressed size of `src` frame content _if known and not empty_, 0 otherwise.
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</p></pre><BR>
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<h3>Helper functions</h3><pre></pre><b><pre>#define ZSTD_COMPRESSBOUND(srcSize) ((srcSize) + ((srcSize)>>8) + (((srcSize) < (128<<10)) ? (((128<<10) - (srcSize)) >> 11) </b>/* margin, from 64 to 0 */ : 0)) /* this formula ensures that bound(A) + bound(B) <= bound(A+B) as long as A and B >= 128 KB */<b>
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@ -1079,6 +1079,7 @@ static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
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zbuff, pledgedSrcSize)) {
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DEBUGLOG(4, "ZSTD_equivalentParams()==1 -> continue mode (wLog1=%u, blockSize1=%zu)",
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zc->appliedParams.cParams.windowLog, zc->blockSize);
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zc->workSpaceTooLarge += (zc->workSpaceTooLarge > 0); /* if it was too large, it still is */
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return ZSTD_continueCCtx(zc, params, pledgedSrcSize);
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} }
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DEBUGLOG(4, "ZSTD_equivalentParams()==0 -> reset CCtx");
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@ -1116,12 +1117,13 @@ static size_t ZSTD_resetCCtx_internal(ZSTD_CCtx* zc,
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int const workSpaceTooSmall = zc->workSpaceSize < neededSpace;
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int const workSpaceTooLarge = zc->workSpaceSize > ZSTD_WORKSPACETOOLARGE_FACTOR * neededSpace;
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int const workSpaceWasteful = 0 && workSpaceTooLarge && (zc->workSpaceTooLarge > ZSTD_WORKSPACETOOLARGE_MAX);
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int const workSpaceWasteful = workSpaceTooLarge && (zc->workSpaceTooLarge > ZSTD_WORKSPACETOOLARGE_MAX);
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zc->workSpaceTooLarge = workSpaceTooLarge ? zc->workSpaceTooLarge+1 : 0;
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DEBUGLOG(4, "Need %zuKB workspace, including %zuKB for match state, and %zuKB for buffers",
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neededSpace>>10, matchStateSize>>10, bufferSpace>>10);
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DEBUGLOG(4, "windowSize: %zu - blockSize: %zu", windowSize, blockSize);
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zc->workSpaceTooLarge = workSpaceTooLarge ? zc->workSpaceTooLarge+1 : 0;
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if (workSpaceTooSmall || workSpaceWasteful) {
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DEBUGLOG(4, "Need to resize workSpaceSize from %zuKB to %zuKB",
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zc->workSpaceSize >> 10,
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@ -450,6 +450,7 @@ static int basicUnitTests(U32 seed, double compressibility)
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}
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DISPLAYLEVEL(3, "OK \n");
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/* this test is really too long, and should be made faster */
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DISPLAYLEVEL(3, "test%3d : overflow protection with large windowLog : ", testNb++);
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{ ZSTD_CCtx* const cctx = ZSTD_createCCtx();
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ZSTD_parameters params = ZSTD_getParams(-9, ZSTD_CONTENTSIZE_UNKNOWN, 0);
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@ -467,6 +468,40 @@ static int basicUnitTests(U32 seed, double compressibility)
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}
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DISPLAYLEVEL(3, "OK \n");
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DISPLAYLEVEL(3, "test%3d : size down context : ", testNb++);
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{ ZSTD_CCtx* const largeCCtx = ZSTD_createCCtx();
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assert(largeCCtx != NULL);
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CHECK_Z( ZSTD_compressBegin(largeCCtx, 19) ); /* streaming implies ZSTD_CONTENTSIZE_UNKNOWN, which maximizes memory usage */
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CHECK_Z( ZSTD_compressEnd(largeCCtx, compressedBuffer, compressedBufferSize, CNBuffer, 1) );
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{ size_t const largeCCtxSize = ZSTD_sizeof_CCtx(largeCCtx); /* size of context must be measured after compression */
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{ ZSTD_CCtx* const smallCCtx = ZSTD_createCCtx();
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assert(smallCCtx != NULL);
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CHECK_Z(ZSTD_compressCCtx(smallCCtx, compressedBuffer, compressedBufferSize, CNBuffer, 1, 1));
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{ size_t const smallCCtxSize = ZSTD_sizeof_CCtx(smallCCtx);
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DISPLAYLEVEL(5, "(large) %zuKB > 32*%zuKB (small) : ",
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largeCCtxSize>>10, smallCCtxSize>>10);
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assert(largeCCtxSize > 32* smallCCtxSize); /* note : "too large" definition is handled within zstd_compress.c .
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* make this test case extreme, so that it doesn't depend on a possibly fluctuating definition */
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}
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ZSTD_freeCCtx(smallCCtx);
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}
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{ U32 const maxNbAttempts = 1100; /* nb of usages before triggering size down is handled within zstd_compress.c.
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* currently defined as 128x, but could be adjusted in the future.
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* make this test long enough so that it's not too much tied to the current definition within zstd_compress.c */
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U32 u;
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for (u=0; u<maxNbAttempts; u++) {
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size_t const srcSize = (FUZ_rand(&seed) & 4095) + 200;
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CHECK_Z(ZSTD_compressCCtx(largeCCtx, compressedBuffer, compressedBufferSize, CNBuffer, srcSize, -9));
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if (ZSTD_sizeof_CCtx(largeCCtx) < largeCCtxSize) break; /* sized down */
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}
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DISPLAYLEVEL(5, "size down after %u attempts : ", u);
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if (u==maxNbAttempts) goto _output_error; /* no sizedown happened */
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}
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}
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ZSTD_freeCCtx(largeCCtx);
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}
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DISPLAYLEVEL(3, "OK \n");
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/* Static CCtx tests */
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#define STATIC_CCTX_LEVEL 3
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DISPLAYLEVEL(3, "test%3i : create static CCtx for level %u :", testNb++, STATIC_CCTX_LEVEL);
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