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#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdio.h>

#include <stdint.h>

#define MAXBUFLEN 4096

int

main(int argc, char *argv[])

{

        struct stat st;

        uint32_t bootsize, datasize, data;

        uint8_t buffer[MAXBUFLEN];

        ssize_t numbytes;

        int fd, fd_boot, fd_data;

        if (argc < 4)

                errx(1, "usage: %s bootprogram datacontents outfile", argv[0]);

        fd = open(argv[3], O_WRONLY | O_CREAT, 0644);

        if (fd < 0)

                err(1, "open %s", argv[3]);

        fd_boot = open(argv[1], O_RDONLY);

        if (fd_boot < 0)

                err(1, "open %s", argv[1]);

        fd_data = open(argv[2], O_RDONLY);

        if (fd_data < 0)

                err(1, "open %s", argv[2]);

        /* Get sizes. */

        if (fstat(fd_boot, &st) < 0)

                err(1, "fstat");

        bootsize = htonl(st.st_size);

        if (fstat(fd_data, &st) < 0)

                err(1, "fstat");

        datasize = htonl(st.st_size);

        /* Write bootsize and datasize. */

        if (write(fd, &bootsize, sizeof(bootsize)) < 0)

                err(1, "write");

        if (write(fd, &datasize, sizeof(datasize)) < 0)

                err(1, "write");

        /* Read data and write to sd. */

        while ((numbytes = read(fd_boot, buffer, MAXBUFLEN)) > 0) {

                if (write(fd, buffer, numbytes) < 0)

                        err(1, "write");

        }

        while ((numbytes = read(fd_data, buffer, MAXBUFLEN)) > 0) {

                if (write(fd, buffer, numbytes) < 0)

                        err(1, "write");

        }

        return (0);

}