#include #include #include #include static char *kernelfile = "/power/ipaq"; ulong crc32(void *buf, int n, ulong crc); void main(int argc, char **argv) { int ifd, n; char buf[64], reply[1]; int i, execsize; Fhdr f; ulong csum; ARGBEGIN{ }ARGEND ifd = open(kernelfile, OREAD); if(ifd < 0){ fprint(2, "dload: can't open %s: %r\n", kernelfile); exits("open"); } i = 0; if(crackhdr(ifd, &f) == 0){ fprint(2, "dload: not an executable file: %r\n"); exits("format"); } if(f.magic != Q_MAGIC){ fprint(2, "dload: not a powerpc executable\n"); exits("format"); } execsize = f.txtsz + f.datsz + f.txtoff; seek(ifd, 0, 0); csum = ~0; while(execsize > 0 && (n = read(ifd, buf, sizeof(buf))) > 0){ if(n > execsize) n = execsize; for(;;){ if(write(1, buf, sizeof(buf)) != sizeof(buf)){ /* always writes full buffer */ fprint(2, "dload: write error: %r\n"); exits("write"); } if(read(0, reply, 1) != 1){ fprint(2, "dload: bad reply\n"); exits("read"); } if(reply[0] != 'n') break; fprint(2, "!"); } if(reply[0] != 'y'){ fprint(2, "dload: bad ack: %c\n", reply[0]); exits("reply"); } if(++i%10 == 0) fprint(2, "."); execsize -= n; } exits(0); } /* * from Rob Warnock */ static ulong crc32tab[256]; /* initialised on first call to crc32 */ enum { CRC32POLY = 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */ }; /* * Build auxiliary table for parallel byte-at-a-time CRC-32. */ static void initcrc32(void) { int i, j; ulong c; for(i = 0; i < 256; i++) { for(c = i << 24, j = 8; j > 0; j--) if(c & (1<<31)) c = (c<<1) ^ CRC32POLY; else c <<= 1; crc32tab[i] = c; } } ulong crc32(void *buf, int n, ulong crc) { uchar *p; if(crc32tab[1] == 0) initcrc32(); crc = ~crc; for(p = buf; --n >= 0;) crc = (crc << 8) ^ crc32tab[(crc >> 24) ^ *p++]; return ~crc; }