/*
* 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.
*/

#include <stdio.h>     // printf
#include <stdlib.h>    // free
#include <string.h>    // strlen, strcat, memset
#include <zstd.h>      // presumes zstd library is installed
#include "common.h"    // Helper functions, CHECK(), and CHECK_ZSTD()

static void compress_orDie(const char* fname, const char* oname)
{
   size_t fSize;
   void* const fBuff = mallocAndLoadFile_orDie(fname, &fSize);
   size_t const cBuffSize = ZSTD_compressBound(fSize);
   void* const cBuff = malloc_orDie(cBuffSize);

   /* Compress.
    * If you are doing many compressions, you may want to reuse the context.
    * See the multiple_simple_compression.c example.
    */
   size_t const cSize = ZSTD_compress(cBuff, cBuffSize, fBuff, fSize, 1);
   CHECK_ZSTD(cSize);

   saveFile_orDie(oname, cBuff, cSize);

   /* success */
   printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);

   free(fBuff);
   free(cBuff);
}

static char* createOutFilename_orDie(const char* filename)
{
   size_t const inL = strlen(filename);
   size_t const outL = inL + 5;
   void* const outSpace = malloc_orDie(outL);
   memset(outSpace, 0, outL);
   strcat(outSpace, filename);
   strcat(outSpace, ".zst");
   return (char*)outSpace;
}

int main(int argc, const char** argv)
{
   const char* const exeName = argv[0];

   if (argc!=2) {
       printf("wrong arguments\n");
       printf("usage:\n");
       printf("%s FILE\n", exeName);
       return 1;
   }

   const char* const inFilename = argv[1];

   char* const outFilename = createOutFilename_orDie(inFilename);
   compress_orDie(inFilename, outFilename);
   free(outFilename);
   return 0;
}