Initial commit

engines/grim/lua/lzio.cpp

@@ -0,0 +1,42 @@
+/*
+** a generic input stream interface
+** See Copyright Notice in lua.h
+*/
+
+
+#include "engines/grim/lua/lzio.h"
+
+#include "common/file.h"
+
+namespace Grim {
+
+int32 zgeteoz(ZIO *) {
+	return EOZ;
+}
+
+ZIO *zopen(ZIO *z, const char *b, int32 size, const char *name) {
+	if (!b)
+		return nullptr;
+	z->n = size;
+	z->p = (const byte *)b;
+	z->name = name;
+	return z;
+}
+
+int32 zread (ZIO *z, void *b, int32 n) {
+	while (n) {
+		int32 m;
+		if (z->n == 0) {
+			return n;
+		}
+		m = (n <= z->n) ? n : z->n;
+		memcpy(b, z->p, m);
+		z->n -= m;
+		z->p += m;
+		b = (char *)b + m;
+		n -= m;
+	}
+	return 0;
+}
+
+} // end of namespace Grim