FreeBSD/Linux Kernel Cross Reference
sys/contrib/zstd/examples/simple_compression.c

     /*
      * Copyright (c) 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.
      */
    
    #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;
    }

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