bsdiff-portable

commit 2f64aeb31b8f4e9d17a3dccb09a069d15c2a7325
parent bd45371d268cb6da6692ab0b4efb76c8ee7bef40
Author: Matthew Endsley <mendsley@gmail.com>
Date:   Thu, 24 Sep 2020 00:19:36 +1000

save lengths in a single buffer, write once

Diffstat:
M
bsdiff.c
 | 
16
++++------------

1 file changed, 4 insertions(+), 12 deletions(-)
diff --git a/bsdiff.c b/bsdiff.c
@@ -62,7 +62,7 @@ main(int argc, char **argv)
 	off_t i;
 	off_t dblen, eblen;
 	uint8_t *db, *eb;
-	uint8_t buf[8];
+	uint8_t buf[24];
 	struct bsdiff_header header = {"BSDIFF40", 0, 0, 0};
 	FILE *pf;
 	BZFILE *pfbz2;
@@ -211,17 +211,9 @@ main(int argc, char **argv)
 			eblen += (scan - lenb) - (lastscan + lenf);
 
 			offtout(lenf, buf);
-			BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
-			if (bz2err != BZ_OK)
-				errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
-
-			offtout((scan - lenb) - (lastscan + lenf), buf);
-			BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
-			if (bz2err != BZ_OK)
-				errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
-
-			offtout((pos - lenb) - (lastpos + lenf), buf);
-			BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
+			offtout((scan - lenb) - (lastscan + lenf), buf + 8);
+			offtout((pos - lenb) - (lastpos + lenf), buf + 16);
+			BZ2_bzWrite(&bz2err, pfbz2, buf, sizeof(buf));
 			if (bz2err != BZ_OK)
 				errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);