From: Bastian Dehn <hhaalo@arcor.de>
Date: Sat, 23 Dec 2017 22:50:28 +0000 (+0100)
Subject: add: calc ISO9660 overhead
X-Git-Url: https://gitweb.hhaalo.de/?a=commitdiff_plain;h=0bf95fabbc7a3ee1692aa204e57f233595c7be00;p=discspan.git

add: calc ISO9660 overhead
---

diff --git a/Makefile b/Makefile
index 24d7b49..03e34e0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC=/usr/bin/gcc
-CFLAGS=-Wall
+CFLAGS=-Wall -lm
 
 BINPATH=/usr/bin
 
diff --git a/discspan.c b/discspan.c
index 9bea789..a304d28 100644
--- a/discspan.c
+++ b/discspan.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <math.h>
 #include <unistd.h>
 #include "file_size.h"
 
@@ -119,14 +120,21 @@ int splitter(struct file_size *input, const char *output,
 		unsigned long long splitgroesse, int length)
 {
 	struct file_size *rest = (struct file_size *)malloc(length * sizeof(struct file_size));
+	unsigned long long filesize = 0;
 	int restcount = 0;
 	FILE *out;
 
+	// First 32768 bytes are unused by ISO9660
+	splitgroesse -= 32768;
+
 	out = fopen(output, "w");
 	for(int i = 0; i <= length; i++) {
+		// ISO9660 filesystem overhead
+		filesize = 33 + strlen(input[i].name) + input[i].fsize;
+		filesize = ceil(filesize/2048) * 2048;
 		// filesize inklusive overhead
-		if(splitgroesse >= input[i].fsize) {
-			splitgroesse -= input[i].fsize;
+		if(splitgroesse >= filesize) {
+			splitgroesse -= filesize;
 			fprintf(out, "%s\n", input[i].name);
 		} else {
 			rest[restcount++] = input[i];