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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
* 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 a zstd round-trip test (compression - decompress)
compares the result with original
and generates a crash (double free) on corruption detection.
*/
/*===========================================
* Dependencies
*==========================================*/
#include <stddef.h> /* size_t */
#include <stdlib.h> /* malloc, free, exit */
#include <stdio.h> /* fprintf */
#include <string.h> /* strcmp */
#include <sys/types.h> /* stat */
#include <sys/stat.h> /* stat */
#include "xxhash.h"
#define ZSTD_STATIC_LINKING_ONLY
#include "zstd.h"
/*===========================================
* Macros
*==========================================*/
#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
static void crash(int errorCode){
/* abort if AFL/libfuzzer, exit otherwise */
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION /* could also use __AFL_COMPILER */
abort();
#else
exit(errorCode);
#endif
}
#define CHECK_Z(f) { \
size_t const err = f; \
if (ZSTD_isError(err)) { \
fprintf(stderr, \
"Error=> %s: %s", \
#f, ZSTD_getErrorName(err)); \
crash(1); \
} }
/** roundTripTest() :
* Compresses `srcBuff` into `compressedBuff`,
* then decompresses `compressedBuff` into `resultBuff`.
* Compression level used is derived from first content byte.
* @return : result of decompression, which should be == `srcSize`
* or an error code if either compression or decompression fails.
* Note : `compressedBuffCapacity` should be `>= ZSTD_compressBound(srcSize)`
* for compression to be guaranteed to work */
static size_t roundTripTest(void* resultBuff, size_t resultBuffCapacity,
void* compressedBuff, size_t compressedBuffCapacity,
const void* srcBuff, size_t srcBuffSize)
{
static const int maxClevel = 19;
size_t const hashLength = MIN(128, srcBuffSize);
unsigned const h32 = XXH32(srcBuff, hashLength, 0);
int const cLevel = h32 % maxClevel;
size_t const cSize = ZSTD_compress(compressedBuff, compressedBuffCapacity, srcBuff, srcBuffSize, cLevel);
if (ZSTD_isError(cSize)) {
fprintf(stderr, "Compression error : %s \n", ZSTD_getErrorName(cSize));
return cSize;
}
return ZSTD_decompress(resultBuff, resultBuffCapacity, compressedBuff, cSize);
}
/** cctxParamRoundTripTest() :
* Same as roundTripTest() except allows experimenting with ZSTD_CCtx_params. */
static size_t cctxParamRoundTripTest(void* resultBuff, size_t resultBuffCapacity,
void* compressedBuff, size_t compressedBuffCapacity,
const void* srcBuff, size_t srcBuffSize)
{
ZSTD_CCtx* const cctx = ZSTD_createCCtx();
ZSTD_CCtx_params* const cctxParams = ZSTD_createCCtxParams();
ZSTD_inBuffer inBuffer = { srcBuff, srcBuffSize, 0 };
ZSTD_outBuffer outBuffer = { compressedBuff, compressedBuffCapacity, 0 };
static const int maxClevel = 19;
size_t const hashLength = MIN(128, srcBuffSize);
unsigned const h32 = XXH32(srcBuff, hashLength, 0);
int const cLevel = h32 % maxClevel;
/* Set parameters */
CHECK_Z( ZSTD_CCtxParams_setParameter(cctxParams, ZSTD_c_compressionLevel, cLevel) );
CHECK_Z( ZSTD_CCtxParams_setParameter(cctxParams, ZSTD_c_nbWorkers, 2) );
CHECK_Z( ZSTD_CCtxParams_setParameter(cctxParams, ZSTD_c_overlapLog, 5) );
/* Apply parameters */
CHECK_Z( ZSTD_CCtx_setParametersUsingCCtxParams(cctx, cctxParams) );
CHECK_Z (ZSTD_compressStream2(cctx, &outBuffer, &inBuffer, ZSTD_e_end) );
ZSTD_freeCCtxParams(cctxParams);
ZSTD_freeCCtx(cctx);
return ZSTD_decompress(resultBuff, resultBuffCapacity, compressedBuff, outBuffer.pos);
}
static size_t checkBuffers(const void* buff1, const void* buff2, size_t buffSize)
{
const char* ip1 = (const char*)buff1;
const char* ip2 = (const char*)buff2;
size_t pos;
for (pos=0; pos<buffSize; pos++)
if (ip1[pos]!=ip2[pos])
break;
return pos;
}
static void roundTripCheck(const void* srcBuff, size_t srcBuffSize, int testCCtxParams)
{
size_t const cBuffSize = ZSTD_compressBound(srcBuffSize);
void* cBuff = malloc(cBuffSize);
void* rBuff = malloc(cBuffSize);
if (!cBuff || !rBuff) {
fprintf(stderr, "not enough memory ! \n");
exit (1);
}
{ size_t const result = testCCtxParams ?
cctxParamRoundTripTest(rBuff, cBuffSize, cBuff, cBuffSize, srcBuff, srcBuffSize)
: roundTripTest(rBuff, cBuffSize, cBuff, cBuffSize, srcBuff, srcBuffSize);
if (ZSTD_isError(result)) {
fprintf(stderr, "roundTripTest error : %s \n", ZSTD_getErrorName(result));
crash(1);
}
if (result != srcBuffSize) {
fprintf(stderr, "Incorrect regenerated size : %u != %u\n", (unsigned)result, (unsigned)srcBuffSize);
crash(1);
}
if (checkBuffers(srcBuff, rBuff, srcBuffSize) != srcBuffSize) {
fprintf(stderr, "Silent decoding corruption !!!");
crash(1);
}
}
free(cBuff);
free(rBuff);
}
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, int testCCtxParams)
{
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, testCCtxParams);
free (buffer);
}
int main(int argCount, const char** argv) {
int argNb = 1;
int testCCtxParams = 0;
if (argCount < 2) {
fprintf(stderr, "Error : no argument : need input file \n");
exit(9);
}
if (!strcmp(argv[argNb], "--cctxParams")) {
testCCtxParams = 1;
argNb++;
}
fileCheck(argv[argNb], testCCtxParams);
fprintf(stderr, "no pb detected\n");
return 0;
}
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