Wrote license header prefixing tool and added some new code.

6 files changed, 95 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index caabbb7..2d55a54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,5 +2,7 @@
 !*.c
 !*.h
 !LICENSE
+!LICENSE_HEADER
+!prefix_header
 !README.md
 !makefile
diff --git a/gpl_header.c b/LICENSE_HEADER
index f038758..f038758 100644
--- a/gpl_header.c
+++ b/LICENSE_HEADER
diff --git a/casting.c b/casting.c
new file mode 100644
index 0000000..9911112
--- /dev/null
+++ b/casting.c
@@ -0,0 +1,34 @@
+
+/*
+ * Copyright (C) 2014  Tomasz Kramkowski <tk@the-tk.com>
+ *
+ * This program is free software. It is licensed under version 3 of the
+ * GNU General Public License.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see [http://www.gnu.org/licenses/].
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+#define harray(type, name, x, y) type (*name)[y] = malloc(sizeof(type) * x * y)
+
+int main(int argc, char **argv)
+{
+	/*int (*test)[5] = malloc(sizeof(int) * 5 * 10);*/
+	harray(int, test, 10, 5);
+
+	for (int i = 0; i < 10; i++)
+		for (int ii = 0; ii < 5; ii++) {
+			test[i][ii] = i * ii;
+			printf("%d, ", i * ii);
+		}
+	putchar('\n');
+
+	for (int i = 0; i < 10 * 5; i++)
+		printf("%d, ", *(((int *)test) + i));
+	putchar('\n');
+
+	free(test);
+	return 0;
+}
diff --git a/lskdecode.c b/lskdecode.c
new file mode 100644
index 0000000..96ab023
--- /dev/null
+++ b/lskdecode.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2014  Tomasz Kramkowski <tk@the-tk.com>
+ *
+ * This program is free software. It is licensed under version 3 of the
+ * GNU General Public License.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see [http://www.gnu.org/licenses/].
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+int main(int argc, char **argv)
+{
+	unsigned char subst[4][256];
+	unsigned char lastval[] = {249, 20, 174, 199};
+
+	/* Generate substitution tables. */
+	for (int i = 0; i < 256; i++) {
+		for (int ii = 0; ii < 4; ii++)
+			subst[ii][i] = lastval[ii];
+
+		if (i % 8 == 7) lastval[0] -= 13;
+		else lastval[0] += i & 1 ? 3 : -1;
+
+		if (i % 8 == 7) lastval[1] += 9;
+		else if ((i + 4) % 8 == 7) lastval[1] -=7;
+		else lastval[1] += 1;
+
+		if (i % 16 == 15) lastval[2] += 29;
+		else lastval[2] += i & 1 ? -3 : 1;
+
+		if (i % 8 == 7) lastval[3] += 15;
+		else lastval[3] -= 1;
+	}
+
+	/* decode */
+	int c;
+	int pos = argc > 1 ? strtol(argv[1], NULL, 10) : 0;
+	while ((c = getchar()) != EOF) {
+		for (int i = 0; i < 256; i++)
+			if (subst[pos%4][i] == c) {
+				if (isascii(i)) putchar(i);
+				break;
+			}
+		pos++;
+	}
+
+	return 0;
+}
diff --git a/makefile b/makefile
index 6b7de25..4bffe01 100644
--- a/makefile
+++ b/makefile
@@ -24,4 +24,4 @@ uninstall :
 	rm "$(DESTDIR)$(PREFIX)$(BINDIR)/$(target)"
 
 clean :
-	find . -mindepth 1 -maxdepth 1 -executable -type f -delete
+	find . -mindepth 1 -maxdepth 1 -executable -type f ! -name "prefix_header" -delete
diff --git a/prefix_header b/prefix_header
new file mode 100755
index 0000000..f18305e
--- /dev/null
+++ b/prefix_header
@@ -0,0 +1,7 @@
+#! /usr/bin/env bash
+
+for file in "$@"; do
+	echo "Processing $file"
+	cat "LICENSE_HEADER" "$file" >"${file}.LICENSE_HEADER"
+	mv "${file}.LICENSE_HEADER" "$file"
+done