Function FIO_passThrough

freebsd/contrib/zstd/programs/fileio.c:2022–2050

FIO_passThrough() : just copy input into output, for compatibility with gzip -df mode @return : 0 (no error) */

/** FIO_passThrough() : just copy input into output, for compatibility with gzip -df mode
    @return : 0 (no error) */
static int FIO_passThrough(const FIO_prefs_t* const prefs,
                           FILE* foutput, FILE* finput,
                           void* buffer, size_t bufferSize,
                           size_t alreadyLoaded)
{
    size_t const blockSize = MIN(64 KB, bufferSize);
    size_t readFromInput;
    unsigned storedSkips = 0;

    /* assumption : ress->srcBufferLoaded bytes already loaded and stored within buffer */
    {   size_t const sizeCheck = fwrite(buffer, 1, alreadyLoaded, foutput);
        if (sizeCheck != alreadyLoaded) {
            DISPLAYLEVEL(1, "Pass-through write error : %s\n", strerror(errno));
            return 1;
    }   }

    do {
        readFromInput = fread(buffer, 1, blockSize, finput);
        storedSkips = FIO_fwriteSparse(foutput, buffer, readFromInput, prefs, storedSkips);
    } while (readFromInput == blockSize);
    if (ferror(finput)) {
        DISPLAYLEVEL(1, "Pass-through read error : %s\n", strerror(errno));
        return 1;
    }
    assert(feof(finput));

    FIO_fwriteSparseEnd(prefs, foutput, storedSkips);
    return 0;
}

/* FIO_zstdErrorHelp() :
 * detailed error message when requested window size is too large */