From: Andrey Rys <rys@lynxlynx.ru>
Date: Sun, 28 Nov 2021 17:05:51 +0000 (+0100)
Subject: -O ioseek=: apply iseek and oseek at same time.
X-Git-Url: https://jxself.org/git/?p=tfcrypt.git;a=commitdiff_plain;h=ef3f3a7b878b0be4da7a22a6954f378aa86561e3

-O ioseek=: apply iseek and oseek at same time.
---

diff --git a/VERSION b/VERSION
index e1617e8..8c61d23 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-57
+58
diff --git a/tfc_error.c b/tfc_error.c
index bb477c4..4d64afd 100644
--- a/tfc_error.c
+++ b/tfc_error.c
@@ -164,6 +164,8 @@ void usage(void)
 		tfc_say("    iobs=val: set IO block size value. Must not exceed %u bytes.", TFC_U(TFC_BLKSIZE));
 		tfc_say("    iseek=val: seek source file/device by these val bytes.");
 		tfc_say("    oseek=val: seek destination file/device by these val bytes.");
+		tfc_say("    ioseek=val: seek both source and destination.");
+		tfc_say("    ioseek is equal to iseek and oseek.");
 		tfc_say("    count=val: process only these val bytes, both input and output.");
 		tfc_say("    ftrunc=val: truncate output file to these val bytes before closing it.");
 		tfc_say("    ftrunc=tail: truncate output's tail, leaving only processed data.");
@@ -350,6 +352,8 @@ void usage(void)
 	tfc_say("    ixctr=val: Increment initial counter by this val bytes.");
 	tfc_say("    Internally this number is translated into number of %u byte blocks.", TFC_U(TF_BLOCK_SIZE));
 	tfc_say("    oseek=val: seek destination file/device by these val bytes.");
+	tfc_say("    ioseek=val: seek both source and destination.");
+	tfc_say("    ioseek is equal to iseek and oseek.");
 	tfc_say("    count=val: process only these val bytes, both input and output.");
 	tfc_say("    ftrunc=val: truncate output file to these val bytes before closing it.");
 	tfc_say("    ftrunc=tail: truncate output's tail, leaving only processed data.");
diff --git a/tfcrypt.c b/tfcrypt.c
index e6d422d..7da9e99 100644
--- a/tfcrypt.c
+++ b/tfcrypt.c
@@ -456,6 +456,33 @@ _baddfname:
 						}
 						else oseek = tfc_modifysize(oseek, strchr(s, ':'));
 					}
+					else if (!strncmp(s, "ioseek", 6) && *(s+6) == '=') {
+						s += 7;
+
+						iseek = tfc_humanfsize(s, &stoi);
+						if (!str_empty(stoi)) {
+							iseek = tfc_fnamesize(s, YES);
+							iseek = tfc_modifysize(iseek, strchr(s, ':'));
+							if (iseek == NOFSIZE) xerror(NO, YES, YES,
+							"%s: invalid iseek value", s);
+						}
+						else iseek = tfc_modifysize(iseek, strchr(s, ':'));
+						if (ctr_mode != TFC_MODE_PLAIN && iseek % TF_BLOCK_SIZE)
+							xerror(NO, YES, YES,
+								"%s: not round to TF block size "
+								"of %u bytes",
+								s, TFC_U(TF_BLOCK_SIZE));
+						iseek_blocks = iseek / TF_BLOCK_SIZE;
+
+						oseek = tfc_humanfsize(s, &stoi);
+						if (!str_empty(stoi)) {
+							oseek = tfc_fnamesize(s, YES);
+							oseek = tfc_modifysize(oseek, strchr(s, ':'));
+							if (oseek == NOFSIZE) xerror(NO, YES, YES,
+							"%s: invalid oseek value", s);
+						}
+						else oseek = tfc_modifysize(oseek, strchr(s, ':'));
+					}
 					else if (!strncmp(s, "count", 5) && *(s+5) == '=') {
 						s += 6;
 						maxlen = tfc_humanfsize(s, &stoi);