1 files changed, 42 insertions, 0 deletions
diff --git a/navit/maptool/buffer.c b/navit/maptool/buffer.c
new file mode 100644
index 00000000..ad64e9ec
--- /dev/null
+++ b/navit/maptool/buffer.c
@@ -0,0 +1,42 @@
+#include <stdlib.h>
+#include "maptool.h"
+#include "debug.h"
+
+void
+save_buffer(char *filename, struct buffer *b, long long offset)
+{
+	FILE *f;
+	f=fopen(filename,"rb+");
+	if (! f)
+		f=fopen(filename,"wb+");
+		
+	dbg_assert(f != NULL);
+	fseek(f, offset, SEEK_SET);
+	fwrite(b->base, b->size, 1, f);
+	fclose(f);
+}
+
+void
+load_buffer(char *filename, struct buffer *b, long long offset, long long size)
+{
+	FILE *f;
+	long long len;
+	int ret;
+	if (b->base)
+		free(b->base);
+	b->malloced=0;
+	f=fopen(filename,"rb");
+	fseek(f, 0, SEEK_END);
+	len=ftell(f);
+	if (offset+size > len) {
+		size=len-offset;
+		ret=1;
+	}
+	b->size=b->malloced=size;
+	fprintf(stderr,"reading "LONGLONG_FMT" bytes from %s at "LONGLONG_FMT"\n", b->size, filename, offset);
+	fseek(f, offset, SEEK_SET);
+	b->base=malloc(b->size);
+	dbg_assert(b->base != NULL);
+	fread(b->base, b->size, 1, f);
+	fclose(f);
+}