Add VHD hard disc image support. Patch from shermanp.

src/minivhd/minivhd_struct_rw.h

@@ -0,0 +1,38 @@
+#ifndef MINIVHD_STRUCT_RW_H
+#define minivhd_struct_rw
+
+#include "minivhd_internal.h"
+
+/**
+ * \brief Save the contents of a VHD footer from a buffer to a struct
+ * 
+ * \param [out] footer save contents of buffer into footer
+ * \param [in] buffer VHD footer in raw bytes
+ */
+void mvhd_buffer_to_footer(MVHDFooter* footer, uint8_t* buffer);
+
+/**
+ * \brief Save the contents of a VHD sparse header from a buffer to a struct
+ * 
+ * \param [out] header save contents of buffer into header
+ * \param [in] buffer VHD header in raw bytes
+ */
+void mvhd_buffer_to_header(MVHDSparseHeader* header, uint8_t* buffer);
+
+/**
+ * \brief Save the contents of a VHD footer struct to a buffer
+ * 
+ * \param [in] footer save contents of struct into buffer
+ * \param [out] buffer VHD footer in raw bytes
+ */
+void mvhd_footer_to_buffer(MVHDFooter* footer, uint8_t* buffer);
+
+/**
+ * \brief Save the contents of a VHD sparse header struct to a buffer
+ * 
+ * \param [in] header save contents of struct into buffer
+ * \param [out] buffer VHD sparse header in raw bytes
+ */
+void mvhd_header_to_buffer(MVHDSparseHeader* header, uint8_t* buffer);
+
+#endif