very basic binary file parsing and skeleton for state-machine based parsing of ascii format

1 files changed, 74 insertions, 0 deletions

diff --git a/service/src/util.c b/service/src/util.c
new file mode 100644
index 0000000..cb97816
--- /dev/null
+++ b/service/src/util.c
@@ -0,0 +1,74 @@
+#include "util.h"
+
+void*
+checkp(void *p)
+{
+	if (!p) die("pointer assertion failed, OOM?\n");
+	return p;
+}
+
+void*
+die(const char *fmtstr, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmtstr);
+	vfprintf(stderr, fmtstr, ap);
+	va_end(ap);
+
+	exit(EXIT_FAILURE);
+}
+
+char*
+aprintf(const char *fmtstr, ...)
+{
+	va_list ap, cpy;
+	size_t nb;
+	char *str;
+
+	va_copy(cpy, ap);
+
+	va_start(cpy, fmtstr);
+	nb = vsnprintf(NULL, 0, fmtstr, ap);
+	va_end(cpy);
+
+	if (nb <= 0) die("encountered invalid fmtstr!\n");
+
+	str = checkp(malloc(nb));
+	va_start(ap, fmtstr);
+	nb = vsnprintf(str, nb, fmtstr, ap);
+	va_end(ap);
+
+	return str;
+}
+
+const char*
+mhash(const char *filename, int len)
+{
+	static const char *hexalph = "0123456789ABCDEF";
+	static char buf[33];
+	int i, k;
+
+	if (len == -1) len = strlen(filename);
+
+	for (i = 0; i < MIN(32, len); i++) {
+		unsigned char v = 0;
+		for (k = i; k < len; k += 32)
+			v ^= filename[k];
+		buf[i*2+0] = hexalph[(v >> 0) & 0x0f];
+		buf[i*2+1] = hexalph[(v >> 4) & 0x0f];
+	}
+
+	if (i == 0) {
+		memset(buf, '0', 32);
+	} else if (i < 32) {
+		for (k = 0; k < 32; k++)
+			buf[k] = buf[k % i];
+	}
+
+	buf[32] = '\0';
+
+	return buf;
+}
+
+