From 03261851a10dd2d6900a0a00a7515a0a46fb5d76 Mon Sep 17 00:00:00 2001
From: Ranjith Kumaran <ranjith@cygnus.com>
Date: Fri, 17 Mar 2000 22:48:54 +0000
Subject: 20000317 sourceware import

---
 libgloss/hp74x/checksum.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 libgloss/hp74x/checksum.c

(limited to 'libgloss/hp74x/checksum.c')

diff --git a/libgloss/hp74x/checksum.c b/libgloss/hp74x/checksum.c
new file mode 100644
index 000000000..4a2b331fe
--- /dev/null
+++ b/libgloss/hp74x/checksum.c
@@ -0,0 +1,150 @@
+#include <stdio.h>
+#include <fcntl.h>
+
+#define USAGE	"USAGE: checkum -[vhcs] infile outfile\n\t-v\tverbose\n\
+\t-h\thelp\n\t-c\tcheck checksum\n\t-s\tprint the ipl size"
+static int verbose = 0;
+static int verify  = 0;
+static int size    = 0;
+
+typedef int word_t;
+#define WORDSIZE (sizeof(word_t))
+
+main(argc, argv)
+     int argc;
+     char **argv;
+{
+  char	 *infile;
+  char	 *outfile;
+  int	 infd;
+  int	 outfd;
+  word_t checksum = 0;
+  int	 nbytes;
+  word_t buf;
+  int	 i        = 1;
+  int	filesize  = 0;
+  
+  while (*argv[i] == '-') {
+      switch (*(argv[i]+1)) {
+      case 'v':
+	verbose++;
+	break;
+      case 'c':
+	verify++;
+	puts ("Sorry, unimplemented for now");
+	exit(1);
+	break;
+      case 's':
+	size++;
+	break;
+      case 'h':
+	puts (USAGE);
+	exit(0);
+      default:
+	printf ("\"%s\", Illegal option\n", argv[i]);
+	puts (USAGE);
+	exit(1);
+    }
+    i++;
+  }
+  infile = *(argv + i);
+  outfile = *(argv + i+1);
+
+  /* see it there were file names on the command line */
+  if (infile == 0x0) {
+    puts("Didn't specify an input file name");
+    exit(1);
+  }
+  if (outfile == 0x0) {
+    puts("Didn't specify an output file name");
+     exit(1);
+  }
+
+  /* try to open the files */
+  infd = open(infile, O_RDONLY);
+  if (infd == -1) {
+    printf("Couldn't open %s\n", infile);
+    exit(1);
+  }
+
+  outfd = open(outfile, O_WRONLY|O_CREAT|O_TRUNC);
+  if (outfd == -1) {
+    printf("Couldn't open %s\n", outfile);
+    exit(1);
+  }
+
+  if (verbose > 2) 
+    putchar('\n');
+
+  /* calculate the checksum */
+  while ((nbytes = read(infd, &buf, WORDSIZE)) == WORDSIZE) {
+    if (verbose > 2) 
+      putchar('.');
+    checksum+= buf;
+    filesize+= WORDSIZE;
+    if (write(outfd, &buf, WORDSIZE) != WORDSIZE) {
+      puts("Couldn't write");
+    } 
+    if (verbose > 3) 
+      putchar('+');
+  }
+  if (verbose > 2) 
+    putchar('\n');
+  
+  /* write the last byte read */
+  if (nbytes > 0) {
+    write(outfd, &buf, nbytes);
+    checksum+= buf;  				/* calculate the last word */
+    filesize+= nbytes;
+  }
+  /* write the checksum */
+  buf = -checksum;
+  write(outfd, &buf, WORDSIZE);
+  filesize+= WORDSIZE;				/* checksum increase the size */
+
+  if (verbose > 0)
+    printf("The calculated checksum is:\n\t0x%x,\n\t%u\n", -checksum, -checksum);
+
+  /* calculate the extra 2K here */
+  buf = 0;
+  while ((filesize % 2048) !=0) {
+    filesize+=WORDSIZE;
+    write(outfd, &buf, WORDSIZE);
+  }
+  if (size > 0) {
+    printf ("%u is the new file size\n", filesize);
+  }
+  close(outfd);
+  close(infd);
+  exit(0);
+}
+
+#if 0
+/* Calculate a simple checksum and concatenate it to the end of BUF.  */
+void
+compute_and_concatenate_checksum (word *buf, size_t bufsize_in_words)
+{
+  size_t i;
+  word sum;
+  sum = buf[0]
+  for (i = 1; i < bufsize_in_words; i++)
+    sum += buf[i];
+  buf[bufsize_in_words] = -sum;
+}
+
+/* Calculate a simple checksum and verify it.  NOTE: bufsize_in_words should
+   include the checksum, i.e., it should be one larger than when the
+   checksum was calculated using compute_and_concatenate_checksum!  */
+int
+compute_and_and_verify_checksum (word *buf, size_t bufsize_in_words)
+{
+  size_t i;
+  word sum;
+  sum = buf[0];
+  for (i = 1; i < bufsize_in_words; i++)
+    sum += buf[i];
+  if (sum != 0)
+    return ERROR;
+  return SUCCESS;
+}
+#endif
-- 
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