-O nobuf: disable IO buffering

[tfcrypt.git] / tfcrypt.c

diff --git a/tfcrypt.c b/tfcrypt.c
index 2b2a26f367aed57659c3f0d65f34203857a2ce4a..bad1d4372c1f55f9f30b2d6809a7687b1ad20325 100644 (file)
--- a/tfcrypt.c
+++ b/tfcrypt.c
@@ -30,6 +30,7 @@
 
 static tfc_byte svctr[TF_BLOCK_SIZE];
 static tfc_fsize rwd, do_read_loops, loopcnt;
+static tfc_yesno unbuffered;
 
 static void open_log(const char *logfile)
 {
@@ -346,6 +347,12 @@ _baddfname:
                                                show_when_done = YES;
                                        else if (!strcmp(s, "pid"))
                                                show_pid = YES;
+                                       else if (!strcmp(s, "nobuf")) {
+                                               if (!tfc_is_freestream(ctr_mode)) xerror(NO, YES, YES,
+                                                       "cannot activate unbuffered mode for non-stream cipher mode %s!",
+                                                       tfc_modename(ctr_mode));
+                                               else unbuffered = YES;
+                                       }
                                        else if (!strncmp(s, "readloops", 9) && *(s+9) == '=') {
                                                do_read_loops = tfc_humanfsize(s+10, &stoi);
                                                if (!str_empty(stoi)) do_read_loops = NOSIZE;
@@ -362,7 +369,7 @@ _baddfname:
                                                        "%s: invalid block size value", s);
                                                }
                                                else blksize = (size_t)tfc_modifysize((tfc_fsize)blksize, strchr(s, ':'));
-                                               if (!tfc_is_stream(ctr_mode) && blksize < TF_BLOCK_SIZE) xerror(NO, YES, YES,
+                                               if (!tfc_is_freestream(ctr_mode) && blksize < TF_BLOCK_SIZE) xerror(NO, YES, YES,
                                                        "%s: block size is lesser than TF_BLOCK_SIZE (%u bytes)", s, TFC_U(TF_BLOCK_SIZE));
                                                if (blksize > TFC_BLKSIZE) xerror(NO, YES, YES,
                                                        "%s: block size exceeds %u bytes",
@@ -1209,7 +1216,7 @@ _ragain:  lio = xread(sfd, pblk, lrem);
                                default: xerror(NO, NO, NO, "%s", srcfname); break;
                        }
                }
-               if (lio && lio < lrem) {
+               if (unbuffered == NO && lio && lio < lrem) {
                        pblk += lio;
                        lrem -= lio;
                        goto _ragain;