best.cpp

非常好用的五子棋游戏源码

// Created:10-13-98
// By Jeff Connelly

// Compresses a file and tells best ratio

#include "comprlib.h"    

typedef struct
{
    char* ext;                  // Extension for compressed file
    char* name;                 // Name of compression method
    void (*encode)();           // Encoding function
} METHOD;

// These are the methods in ComprLib that work
METHOD methods[] =
{
    { ".lzs", "LZSS", lzss_encode },
    { ".lzw", "LZW", lzw_encode },
    { ".rl1", "RLE1", rle1_encode },
    { ".rl2", "RLE2", rle2_encode },
    { ".inc", "INCR", incr_encode },
    { NULL, NULL, NULL },
};

int file_size(FILE* fp)
{
    int pos = ftell(fp);
    int size;
    fseek(fp, 0, SEEK_END);
    size = ftell(fp);
    fseek(fp, pos, SEEK_SET);
    return size;
}

int main(int argc, char* argv[])
{
    int i;
    char* ext;
    char* out;

    if (argc == 1)
    {
        printf ("Compresses a file with various methods and reports best\n"
                "\tBEST filename\n"
                "Compressed files have unique extensions\n"
                "\n");
        exit (0);
    }

    // Use file I/O
    ComprLibFileIO::Set();

    ComprLibFileIO::source_file = fopen(argv[1], "r+b");
    if (!ComprLibFileIO::source_file)
    {
        printf ("Cannot open %s\n", argv[1]);
    }

    for (i = 0; methods[i].encode; ++i)
    {
        // Use the extension that is unique to the method
        out = xmalloc(strlen(argv[1]));
        strcpy (out, argv[1]);
        ext = strchr(out, '.');
        strcpy (ext, methods[i].ext);

        // Open the destination file
        ComprLibFileIO::dest_file = fopen(out, "w+b");
        if (!ComprLibFileIO::dest_file)
        {
            printf ("Cannot open %s\n", out);
        }

        printf ("\n%s: %d%%", methods[i].name,
                ((double)file_size(ComprLibFileIO::dest_file) /
                (double)file_size(ComprLibFileIO::source_file))
                * 100);
        methods[i].encode();

        xfree(out);
    }
    return 0;
}