add util/ungz (needs zlib)

util/ungz.c

@@ -0,0 +1,48 @@
+/* vim: ts=4 sw=4 noexpandtab
+ * Really dumb wrapper around gzopen/gzread
+ *
+ * build with:
+ *  i686-pc-toaru-gcc -o base/usr/bin/ungz ungz.c -lz
+ */
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <zlib.h>
+
+int main(int argc, char **argv) {
+	int ret;
+
+	if (argc < 2) {
+		fprintf(stderr, "Usage: %s file.gz\n", argv[0]);
+		return 1;
+	}
+
+	if (strstr(argv[1],".gz") != (argv[1] + strlen(argv[1]) - 3)) {
+		fprintf(stderr, "%s: Not sure if this file is gzipped. Try renaming it to include `.gz' at the end.\n", argv[0]);
+		return 1;
+	}
+
+	gzFile src = gzopen(argv[1], "r");
+
+	if (!src) return 1;
+
+	char * dest_name = strdup(argv[1]);
+	char * t = strstr(dest_name,".gz");
+	*t = '\0';
+
+	FILE * dest = fopen(dest_name, "w");
+
+	if (!dest) return 1;
+
+	while (!gzeof(src)) {
+		char buf[1024];
+		int r = gzread(src, buf, 1024);
+		fwrite(buf, r, 1, dest);
+	}
+
+	fclose(dest);
+
+	unlink(argv[1]);
+
+	return 0;
+}