1 files changed, 39 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/SNIP/checksum.c b/reference/C/CONTRIB/SNIP/checksum.c
new file mode 100755
index 0000000..4071f02
--- /dev/null
+++ b/reference/C/CONTRIB/SNIP/checksum.c
@@ -0,0 +1,39 @@
+/*
+**  CHECKSUM.C - Compute the checksum of a file
+**
+**  public somain demo by Bob Stout
+*/
+
+#include <stdlib.h>
+
+unsigned checksum(void *buffer, size_t len, unsigned int seed)
+{
+      unsigned char *buf = (unsigned char *)buffer;
+      size_t i;
+
+      for (i = 0; i < len; ++i)
+            seed += (unsigned int)(*buf++);
+      return seed;
+}
+
+#ifdef TEST
+
+#include <stdio.h>
+
+main()
+{
+      FILE *fp;
+      size_t len;
+      char buf[4096], *file = "CHECKSUM.C";
+
+      if (NULL == (fp = fopen(file, "rb")))
+      {
+            printf("Unable to open %s for reading\n", file);
+            return -1;
+      }
+      len = fread(buf, sizeof(char), sizeof(buf), fp);
+      printf("%d bytes read\n", len);
+      printf("The checksum of %s is %#x\n", file, checksum(buf, len, 0));
+}
+
+#endif