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/*
* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/*
* This program takes a file in input,
* performs an LZ4 round-trip test (compression - decompress)
* compares the result with original
* and generates an abort() on corruption detection,
* in order for afl to register the event as a crash.
*/
/*===========================================
* Dependencies
*==========================================*/
#include <stddef.h> /* size_t */
#include <stdlib.h> /* malloc, free, exit */
#include <stdio.h> /* fprintf */
#include <string.h> /* strcmp */
#include <assert.h>
#include <sys/types.h> /* stat */
#include <sys/stat.h> /* stat */
#include "xxhash.h"
#include "lz4.h"
#include "lz4hc.h"
/*===========================================
* Macros
*==========================================*/
#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
#define MSG(...) fprintf(stderr, __VA_ARGS__)
#define CONTROL_MSG(c, ...) { \
if ((c)) { \
MSG(__VA_ARGS__); \
MSG(" \n"); \
abort(); \
} \
}
static size_t checkBuffers(const void* buff1, const void* buff2, size_t buffSize)
{
const char* const ip1 = (const char*)buff1;
const char* const ip2 = (const char*)buff2;
size_t pos;
for (pos=0; pos<buffSize; pos++)
if (ip1[pos]!=ip2[pos])
break;
return pos;
}
/** roundTripTest() :
* Compresses `srcBuff` into `compressedBuff`,
* then decompresses `compressedBuff` into `resultBuff`.
* Compression level used is derived from content's head bytes.
* This function abort() if it detects any round-trip error,
* so if it returns, round trip is considered successfully validated.
* Note : `compressedBuffCapacity` should be `>= LZ4_compressBound(srcSize)`
* for compression to be guaranteed to work */
static void roundTripTest(void* resultBuff, size_t resultBuffCapacity,
void* compressedBuff, size_t compressedBuffCapacity,
const void* srcBuff, size_t srcSize)
{
const int minCLevel = 1;
const int maxClevel = 12;
const int cLevelSpan = maxClevel - minCLevel;
size_t const hashLength = MIN(16, srcSize);
unsigned const h32 = XXH32(srcBuff, hashLength, 0);
int const randL = h32 % (cLevelSpan+1);
int const cLevel = minCLevel + randL;
int const realCLevel = (cLevel * 0) + 9; /* <=== Currently : only test level 9 */
int const cSize = LZ4_compress_HC((const char*)srcBuff, (char*)compressedBuff, (int)srcSize, (int)compressedBuffCapacity, realCLevel);
CONTROL_MSG(cSize == 0, "Compression error !");
{ int const dSize = LZ4_decompress_safe((const char*)compressedBuff, (char*)resultBuff, cSize, (int)resultBuffCapacity);
CONTROL_MSG(dSize < 0, "Decompression detected an error !");
CONTROL_MSG(dSize != (int)srcSize, "Decompression corruption error : wrong decompressed size !");
}
/* check potential content corruption error */
assert(resultBuffCapacity >= srcSize);
{ size_t const errorPos = checkBuffers(srcBuff, resultBuff, srcSize);
CONTROL_MSG(errorPos != srcSize,
"Silent decoding corruption, at pos %u !!!",
(unsigned)errorPos);
}
}
static void roundTripCheck(const void* srcBuff, size_t srcSize)
{
size_t const cBuffSize = LZ4_compressBound((int)srcSize);
void* const cBuff = malloc(cBuffSize);
void* const rBuff = malloc(cBuffSize);
if (!cBuff || !rBuff) {
fprintf(stderr, "not enough memory ! \n");
exit(1);
}
roundTripTest(rBuff, cBuffSize,
cBuff, cBuffSize,
srcBuff, srcSize);
free(rBuff);
free(cBuff);
}
static size_t getFileSize(const char* infilename)
{
int r;
#if defined(_MSC_VER)
struct _stat64 statbuf;
r = _stat64(infilename, &statbuf);
if (r || !(statbuf.st_mode & S_IFREG)) return 0; /* No good... */
#else
struct stat statbuf;
r = stat(infilename, &statbuf);
if (r || !S_ISREG(statbuf.st_mode)) return 0; /* No good... */
#endif
return (size_t)statbuf.st_size;
}
static int isDirectory(const char* infilename)
{
int r;
#if defined(_MSC_VER)
struct _stat64 statbuf;
r = _stat64(infilename, &statbuf);
if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
#else
struct stat statbuf;
r = stat(infilename, &statbuf);
if (!r && S_ISDIR(statbuf.st_mode)) return 1;
#endif
return 0;
}
/** loadFile() :
* requirement : `buffer` size >= `fileSize` */
static void loadFile(void* buffer, const char* fileName, size_t fileSize)
{
FILE* const f = fopen(fileName, "rb");
if (isDirectory(fileName)) {
fprintf(stderr, "Ignoring %s directory \n", fileName);
exit(2);
}
if (f==NULL) {
fprintf(stderr, "Impossible to open %s \n", fileName);
exit(3);
}
{ size_t const readSize = fread(buffer, 1, fileSize, f);
if (readSize != fileSize) {
fprintf(stderr, "Error reading %s \n", fileName);
exit(5);
} }
fclose(f);
}
static void fileCheck(const char* fileName)
{
size_t const fileSize = getFileSize(fileName);
void* const buffer = malloc(fileSize + !fileSize /* avoid 0 */);
if (!buffer) {
fprintf(stderr, "not enough memory \n");
exit(4);
}
loadFile(buffer, fileName, fileSize);
roundTripCheck(buffer, fileSize);
free (buffer);
}
int main(int argCount, const char** argv)
{
int const argNb = 1;
if (argCount < 2) {
fprintf(stderr, "Error : no argument : need input file \n");
exit(9);
}
fileCheck(argv[argNb]);
fprintf(stderr, "no pb detected \n");
return 0;
}
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