+void get_checksum2(char *buf, int32 len, char *sum)
+{
+ int32 i;
+ static char *buf1;
+ static int32 len1;
+ struct mdfour m;
+
+ if (len > len1) {
+ if (buf1)
+ free(buf1);
+ buf1 = new_array(char, len+4);
+ len1 = len;
+ if (!buf1)
+ out_of_memory("get_checksum2");
+ }
+
+ mdfour_begin(&m);
+
+ memcpy(buf1,buf,len);
+ if (checksum_seed) {
+ SIVAL(buf1,len,checksum_seed);
+ len += 4;
+ }
+
+ for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
+ mdfour_update(&m, (uchar *)(buf1+i), CSUM_CHUNK);
+ }
+ /*
+ * Prior to version 27 an incorrect MD4 checksum was computed
+ * by failing to call mdfour_tail() for block sizes that
+ * are multiples of 64. This is fixed by calling mdfour_update()
+ * even when there are no more bytes.
+ */
+ if (len - i > 0 || protocol_version >= 27) {
+ mdfour_update(&m, (uchar *)(buf1+i), (len-i));
+ }
+
+ mdfour_result(&m, (uchar *)sum);
+}
+
+
+void file_checksum(char *fname,char *sum,OFF_T size)
+{
+ OFF_T i;
+ struct map_struct *buf;
+ int fd;
+ OFF_T len = size;
+ struct mdfour m;
+
+ memset(sum,0,MD4_SUM_LENGTH);
+
+ fd = do_open(fname, O_RDONLY, 0);
+ if (fd == -1)
+ return;
+
+ buf = map_file(fd, size, MAX_MAP_SIZE, CSUM_CHUNK);
+
+ mdfour_begin(&m);
+
+ for(i = 0; i + CSUM_CHUNK <= len; i += CSUM_CHUNK) {
+ mdfour_update(&m, (uchar *)map_ptr(buf, i, CSUM_CHUNK),
+ CSUM_CHUNK);
+ }
+
+ /* Prior to version 27 an incorrect MD4 checksum was computed
+ * by failing to call mdfour_tail() for block sizes that
+ * are multiples of 64. This is fixed by calling mdfour_update()
+ * even when there are no more bytes. */
+ if (len - i > 0 || protocol_version >= 27)
+ mdfour_update(&m, (uchar *)map_ptr(buf, i, len-i), len-i);
+
+ mdfour_result(&m, (uchar *)sum);
+
+ close(fd);
+ unmap_file(buf);
+}
+
+
+static int32 sumresidue;
+static char sumrbuf[CSUM_CHUNK];
+static struct mdfour md;
+
+void sum_init(int seed)