/*
* 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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