94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* this is the beginning of a tool which will eventually
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* be able to build rom images with both fallback and
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* normal. For now it just builds a single image
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* into a rom iamge
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*/
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/* one switch we already need: -zero allowing you to tell what
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* to do with numbers that are "zero": make them 0xff or whatever
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* for flash
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* For now we assume "zero" is 0xff
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*/
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void
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usage(){
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fprintf(stderr, "Usage: buildrom <input> <output> <payload> ");
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fprintf(stderr, " <linuxbios-size> <total-size\n");
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exit(1);
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}
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void
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fatal(char *s){
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perror(s);
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exit(2);
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}
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int
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main(int argc, char *argv[]) {
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int infd, payloadfd, outfd, size, insize, readlen, writelen, i;
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int romsize;
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unsigned char *cp;
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struct stat inbuf, payloadbuf;
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char zero = 0xff;
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if (argc != 6)
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usage();
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infd = open(argv[1], O_RDONLY);
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if (infd < 0)
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fatal(argv[1]);
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outfd = open(argv[2], O_RDWR|O_CREAT, 0666);
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if (outfd < 0)
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fatal(argv[2]);
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payloadfd = open(argv[3], O_RDONLY);
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if (payloadfd < 0)
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fatal(argv[3]);
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size = strtol(argv[4], 0, 0);
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romsize = strtol(argv[5], 0, 0);
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if (fstat(infd, &inbuf) < 0)
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fatal("stat of infile");
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if (inbuf.st_size > size)
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fatal("input file larger than allowed size!\n");
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if (fstat(payloadfd, &payloadbuf) < 0)
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fatal("stat of infile");
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if (payloadbuf.st_size > (romsize - size))
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fatal("payload + linuxbios size larger than ROM size!\n");
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cp = malloc(romsize);
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if (! cp)
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fatal("malloc buffer");
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for(i = 0; i < romsize; i++)
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cp[i] = zero;
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/* read the input file in at the END of the array */
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readlen = read(infd, &cp[romsize - inbuf.st_size], inbuf.st_size);
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if (readlen < inbuf.st_size) {
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fprintf(stderr, "Wanted %d, got %d\n", inbuf.st_size, readlen);
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fatal("Read input file");
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}
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/* read the payload file in at the START of the array */
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readlen = read(payloadfd, cp, payloadbuf.st_size);
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if (readlen < payloadbuf.st_size) {
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fprintf(stderr, "Wanted %d, got %d\n",
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payloadbuf.st_size, readlen);
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fatal("Read payload file");
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}
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writelen = write(outfd, cp, romsize);
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if (writelen < size) {
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fprintf(stderr, "Wanted %d, got %d\n", size, writelen);
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fatal("Write output file");
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}
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return 0;
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}
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