1 files changed, 72 insertions, 0 deletions
diff --git a/statefile.c b/statefile.c
new file mode 100644
index 0000000..08fb372
--- /dev/null
+++ b/statefile.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "config.h"
+
+int
+state_load(config_t* conf, uint32_t* map, uint32_t* jobs_done) {
+	FILE*  fh = NULL;
+	size_t mapsize;
+	int    errsv;
+
+	mapsize = conf->width * conf->height * conf->iters_n;
+
+	if(!(fh = fopen(conf->statefile, "rb"))) {
+		if(errno == ENOENT) {
+			memset(map, 0, mapsize);
+			*jobs_done = 0;
+			return 1;
+		}
+
+		return 0;
+	}
+
+	if(fread(jobs_done, sizeof(uint32_t), 1, fh) != 1) {
+		errsv = errno;
+		fclose(fh);
+		errno = errsv;
+		return 0;
+	}
+
+	if(fread(map, sizeof(uint32_t), mapsize, fh) != mapsize) {
+		errsv = errno;
+		fclose(fh);
+		errno = errsv;
+		return 0;
+	}
+
+	fclose(fh);
+	return 1;
+}
+
+int
+state_save(config_t* conf, uint32_t* map, uint32_t jobs_done) {
+	FILE*  fh = NULL;
+	size_t mapsize;
+	int    errsv;
+
+	mapsize = conf->width * conf->height * conf->iters_n;
+
+	if(!(fh = fopen(conf->statefile, "wb"))) {
+		return 0;
+	}
+
+	if(fwrite(&jobs_done, sizeof(uint32_t), 1, fh) != 1) {
+		errsv = errno;
+		fclose(fh);
+		errno = errsv;
+		return 0;
+	}
+
+	if(fwrite(map, sizeof(uint32_t), mapsize, fh) != mapsize) {
+		errsv = errno;
+		fclose(fh);
+		errno = errsv;
+		return 0;
+	}
+
+	fclose(fh);
+	return 1;
+}