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/*

 *      linux/zBoot/piggyback.c

 *

 *      (C) 1993 Hannu Savolainen

 */

/*

 *      This program reads the compressed system image from stdin and

 *      encapsulates it into an object file written to the stdout.

 */

#include <stdio.h>

#include <unistd.h>

#include <a.out.h>

int main(int argc, char *argv[])

{

        int c, n=0, len=0;

        char tmp_buf[512*1024];

        struct exec obj = {0x00640107}; /* object header */

        char string_names[] = {"_input_data\0_input_len\0"};

        struct nlist var_names[2] = /* Symbol table */

                {

                        {       /* _input_data  */

                                (char *)4, 7, 0, 0, 0

                        },

                        {       /* _input_len */

                                (char *)16, 7, 0, 0, 0

                        }

                };

        len = 0;

        while ((n = read(0, &tmp_buf[len], sizeof(tmp_buf)-len+1)) > 0)

              len += n;

        if (n==-1)

        {

                perror("stdin");

                exit(-1);

        }

        if (len >= sizeof(tmp_buf))

        {

                fprintf(stderr, "%s: Input too large\n", argv[0]);

                exit(-1);

        }

        fprintf(stderr, "Compressed size %d.\n", len);

/*

 *      Output object header

 */

        obj.a_data = len + sizeof(long);

        obj.a_syms = sizeof(var_names);

        write(1, (char *)&obj, sizeof(obj));

/*

 *      Output data segment (compressed system & len)

 */

        write(1, tmp_buf, len);

        write(1, (char *)&len, sizeof(len));

/*

 *      Output symbol table

 */

        var_names[1].n_value = len;

        write(1, (char *)&var_names, sizeof(var_names));

/*

 *      Output string table

 */

        len = sizeof(string_names) + sizeof(len);

        write(1, (char *)&len, sizeof(len));

        write(1, string_names, sizeof(string_names));

        exit(0);

}