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Merge pull request #499 from felixhandte/lz4-attach-dict-tests

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Test LZ4_attach_dictionary() and Friends
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Yann Collet 2018-04-13 13:22:38 -07:00 committed by GitHub
commit 2cb9c9034a
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1 changed files with 99 additions and 2 deletions
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tests/fuzzer.c
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@ -43,6 +43,7 @@
#include <stdio.h> /* fgets, sscanf */
#include <string.h> /* strcmp */
#include <time.h> /* clock_t, clock, CLOCKS_PER_SEC */
#define LZ4_STATIC_LINKING_ONLY
#define LZ4_HC_STATIC_LINKING_ONLY
#include "lz4hc.h"
#define XXH_STATIC_LINKING_ONLY
@ -302,9 +303,9 @@ static int FUZ_test(U32 seed, U32 nbCycles, const U32 startCycle, const double c
U32 testNb = 0;
U32 randState = FUZ_rand(&coreRandState) ^ PRIME3;
int const blockSize = (FUZ_rand(&randState) % (FUZ_MAX_BLOCK_SIZE-1)) + 1;
int const blockStart = FUZ_rand(&randState) % (COMPRESSIBLE_NOISE_LENGTH - blockSize);
int const blockStart = (FUZ_rand(&randState) % (COMPRESSIBLE_NOISE_LENGTH - blockSize - 1)) + 1;
int const dictSizeRand = FUZ_rand(&randState) % FUZ_MAX_DICT_SIZE;
int const dictSize = MIN(dictSizeRand, blockStart);
int const dictSize = MIN(dictSizeRand, blockStart - 1);
int const compressionLevel = FUZ_rand(&randState) % (LZ4HC_CLEVEL_MAX+1);
char* const block = ((char*)CNBuffer) + blockStart;
const char* dict = block - dictSize;
@ -402,6 +403,11 @@ static int FUZ_test(U32 seed, U32 nbCycles, const U32 startCycle, const double c
ret = LZ4_compress_fast_extState(stateLZ4, block, compressedBuffer, blockSize, (int)compressedBufferSize, 8);
FUZ_CHECKTEST(ret==0, "LZ4_compress_fast_extState() failed");
/* Test compression using fast reset external state*/
FUZ_DISPLAYTEST;
ret = LZ4_compress_fast_extState_fastReset(stateLZ4, block, compressedBuffer, blockSize, (int)compressedBufferSize, 8);
FUZ_CHECKTEST(ret==0, "LZ4_compress_fast_extState_fastReset() failed");
/* Test compression */
FUZ_DISPLAYTEST;
ret = LZ4_compress_default(block, compressedBuffer, blockSize, (int)compressedBufferSize);
@ -626,6 +632,97 @@ static int FUZ_test(U32 seed, U32 nbCycles, const U32 startCycle, const double c
FUZ_CHECKTEST(decodedBuffer[blockSize-missingBytes], "LZ4_decompress_safe_usingDict overrun specified output buffer size (-%u byte) (blockSize=%i)", missingBytes, blockSize);
} }
/* Compress using external dictionary stream */
FUZ_DISPLAYTEST;
{
LZ4_stream_t LZ4_stream;
int expectedSize;
U32 expectedCrc;
LZ4_loadDict(&LZ4dict, dict, dictSize);
expectedSize = LZ4_compress_fast_continue(&LZ4dict, block, compressedBuffer, blockSize, (int)compressedBufferSize, 1);
FUZ_CHECKTEST(expectedSize<=0, "LZ4_compress_fast_continue reference compression for extDictCtx should have succeeded");
expectedCrc = XXH32(compressedBuffer, expectedSize, 0);
LZ4_loadDict(&LZ4dict, dict, dictSize);
LZ4_resetStream(&LZ4_stream);
LZ4_attach_dictionary(&LZ4_stream, &LZ4dict);
blockContinueCompressedSize = LZ4_compress_fast_continue(&LZ4_stream, block, compressedBuffer, blockSize, (int)compressedBufferSize, 1);
FUZ_CHECKTEST(blockContinueCompressedSize==0, "LZ4_compress_fast_continue using extDictCtx failed");
/* In the future, it might be desirable to let extDictCtx mode's
* output diverge from the output generated by regular extDict mode.
* Until that time, this comparison serves as a good regression
* test.
*/
FUZ_CHECKTEST(blockContinueCompressedSize != expectedSize, "LZ4_compress_fast_continue using extDictCtx produced different-sized output (%d expected vs %d actual)", expectedSize, blockContinueCompressedSize);
FUZ_CHECKTEST(XXH32(compressedBuffer, blockContinueCompressedSize, 0) != expectedCrc, "LZ4_compress_fast_continue using extDictCtx produced different output");
FUZ_DISPLAYTEST;
LZ4_resetStream(&LZ4_stream);
LZ4_attach_dictionary(&LZ4_stream, &LZ4dict);
ret = LZ4_compress_fast_continue(&LZ4_stream, block, compressedBuffer, blockSize, blockContinueCompressedSize-1, 1);
FUZ_CHECKTEST(ret>0, "LZ4_compress_fast_continue using extDictCtx should fail : one missing byte for output buffer : %i written, %i buffer", ret, blockContinueCompressedSize);
FUZ_DISPLAYTEST;
LZ4_resetStream(&LZ4_stream);
LZ4_attach_dictionary(&LZ4_stream, &LZ4dict);
ret = LZ4_compress_fast_continue(&LZ4_stream, block, compressedBuffer, blockSize, blockContinueCompressedSize, 1);
FUZ_CHECKTEST(ret!=blockContinueCompressedSize, "LZ4_compress_limitedOutput_compressed size is different (%i != %i)", ret, blockContinueCompressedSize);
FUZ_CHECKTEST(ret<=0, "LZ4_compress_fast_continue using extDictCtx should work : enough size available within output buffer");
FUZ_CHECKTEST(ret != expectedSize, "LZ4_compress_fast_continue using extDictCtx produced different-sized output");
FUZ_CHECKTEST(XXH32(compressedBuffer, ret, 0) != expectedCrc, "LZ4_compress_fast_continue using extDictCtx produced different output");
FUZ_DISPLAYTEST;
LZ4_resetStream_fast(&LZ4_stream);
LZ4_attach_dictionary(&LZ4_stream, &LZ4dict);
ret = LZ4_compress_fast_continue(&LZ4_stream, block, compressedBuffer, blockSize, blockContinueCompressedSize, 1);
FUZ_CHECKTEST(ret!=blockContinueCompressedSize, "LZ4_compress_limitedOutput_compressed size is different (%i != %i)", ret, blockContinueCompressedSize);
FUZ_CHECKTEST(ret<=0, "LZ4_compress_fast_continue using extDictCtx with re-used context should work : enough size available within output buffer");
FUZ_CHECKTEST(ret != expectedSize, "LZ4_compress_fast_continue using extDictCtx produced different-sized output");
FUZ_CHECKTEST(XXH32(compressedBuffer, ret, 0) != expectedCrc, "LZ4_compress_fast_continue using extDictCtx produced different output");
}
/* Decompress with dictionary as external */
FUZ_DISPLAYTEST;
decodedBuffer[blockSize] = 0;
ret = LZ4_decompress_fast_usingDict(compressedBuffer, decodedBuffer, blockSize, dict, dictSize);
FUZ_CHECKTEST(ret!=blockContinueCompressedSize, "LZ4_decompress_fast_usingDict did not read all compressed block input");
FUZ_CHECKTEST(decodedBuffer[blockSize], "LZ4_decompress_fast_usingDict overrun specified output buffer size");
crcCheck = XXH32(decodedBuffer, blockSize, 0);
if (crcCheck!=crcOrig) FUZ_findDiff(block, decodedBuffer);
FUZ_CHECKTEST(crcCheck!=crcOrig, "LZ4_decompress_fast_usingDict corrupted decoded data (dict %i)", dictSize);
FUZ_DISPLAYTEST;
decodedBuffer[blockSize] = 0;
ret = LZ4_decompress_safe_usingDict(compressedBuffer, decodedBuffer, blockContinueCompressedSize, blockSize, dict, dictSize);
FUZ_CHECKTEST(ret!=blockSize, "LZ4_decompress_safe_usingDict did not regenerate original data");
FUZ_CHECKTEST(decodedBuffer[blockSize], "LZ4_decompress_safe_usingDict overrun specified output buffer size");
crcCheck = XXH32(decodedBuffer, blockSize, 0);
FUZ_CHECKTEST(crcCheck!=crcOrig, "LZ4_decompress_safe_usingDict corrupted decoded data");
FUZ_DISPLAYTEST;
decodedBuffer[blockSize-1] = 0;
ret = LZ4_decompress_fast_usingDict(compressedBuffer, decodedBuffer, blockSize-1, dict, dictSize);
FUZ_CHECKTEST(ret>=0, "LZ4_decompress_fast_usingDict should have failed : wrong original size (-1 byte)");
FUZ_CHECKTEST(decodedBuffer[blockSize-1], "LZ4_decompress_fast_usingDict overrun specified output buffer size");
FUZ_DISPLAYTEST;
decodedBuffer[blockSize-1] = 0;
ret = LZ4_decompress_safe_usingDict(compressedBuffer, decodedBuffer, blockContinueCompressedSize, blockSize-1, dict, dictSize);
FUZ_CHECKTEST(ret>=0, "LZ4_decompress_safe_usingDict should have failed : not enough output size (-1 byte)");
FUZ_CHECKTEST(decodedBuffer[blockSize-1], "LZ4_decompress_safe_usingDict overrun specified output buffer size");
FUZ_DISPLAYTEST;
{ U32 const missingBytes = (FUZ_rand(&randState) & 0xF) + 2;
if ((U32)blockSize > missingBytes) {
decodedBuffer[blockSize-missingBytes] = 0;
ret = LZ4_decompress_safe_usingDict(compressedBuffer, decodedBuffer, blockContinueCompressedSize, blockSize-missingBytes, dict, dictSize);
FUZ_CHECKTEST(ret>=0, "LZ4_decompress_safe_usingDict should have failed : output buffer too small (-%u byte)", missingBytes);
FUZ_CHECKTEST(decodedBuffer[blockSize-missingBytes], "LZ4_decompress_safe_usingDict overrun specified output buffer size (-%u byte) (blockSize=%i)", missingBytes, blockSize);
} }
/* Compress HC using External dictionary */
FUZ_DISPLAYTEST;
dict -= (FUZ_rand(&randState) & 7); /* even bigger separation */