farbfeld

commit 96faf20b1bcef354e6b1fd03a26c286070c52e74
parent d8796e33f347b92a6526a1f3e6da8f5ddae7391b
Author: FRIGN <dev@frign.de>
Date:   Sun, 10 Apr 2016 22:54:42 +0200

Remove dimension checks

This may come as a surprise, but I'd like the libraries to handle
these cases.
Maybe some day libpng supports 0x0 images, so why impose artificial
limits here?
Same with ppm.

For me, an ideal data converter loses as little information as possible.
In mixed cases (dimensions 0xn, where n > 0) we could print a warning,
but here, 2 principles come at play:
	- GIGO (garbage in, garbage out)
	- no information loss if possible
Given the code later on won't try to access the malloc(0) region, we
are also all safe.

Diffstat:
M
ff2jpg.c
 | 
10
++--------
M
ff2ppm.c
 | 
10
++--------

2 files changed, 4 insertions(+), 16 deletions(-)
diff --git a/ff2jpg.c b/ff2jpg.c
@@ -87,14 +87,8 @@ main(int argc, char *argv[])
 		fprintf(stderr, "%s: invalid magic value\n", argv0);
 		return 1;
 	}
-	if (!(width = ntohl(hdr[2]))) {
-		fprintf(stderr, "%s: invalid width: zero\n", argv0);
-		return 1;
-	}
-	if (!(height = ntohl(hdr[3]))) {
-		fprintf(stderr, "%s: invalid height: zero\n", argv0);
-		return 1;
-	}
+	width = ntohl(hdr[2]);
+	height = ntohl(hdr[3]);
 
 	if (width > SIZE_MAX / ((sizeof("RGBA") - 1) * sizeof(uint16_t))) {
 		fprintf(stderr, "%s: row length integer overflow\n", argv0);
diff --git a/ff2ppm.c b/ff2ppm.c
@@ -67,14 +67,8 @@ main(int argc, char *argv[])
 		fprintf(stderr, "%s: invalid magic value\n", argv0);
 		return 1;
 	}
-	if (!(width = ntohl(hdr[2]))) {
-		fprintf(stderr, "%s: invalid width: zero\n", argv0);
-		return 1;
-	}
-	if (!(height = ntohl(hdr[3]))) {
-		fprintf(stderr, "%s: invalid height: zero\n", argv0);
-		return 1;
-	}
+	width = ntohl(hdr[2]);
+	height = ntohl(hdr[3]);
 
 	if (width > SIZE_MAX / ((sizeof("RGBA") - 1) * sizeof(uint16_t))) {
 		fprintf(stderr, "%s: row length integer overflow\n", argv0);