Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / openbios / fs / iso9660 / iso9660_readdir.c

diff --git a/qemu/roms/openbios/fs/iso9660/iso9660_readdir.c b/qemu/roms/openbios/fs/iso9660/iso9660_readdir.c
new file mode 100644 (file)
index 0000000..003ffb2
--- /dev/null
+++ b/qemu/roms/openbios/fs/iso9660/iso9660_readdir.c
@@ -0,0 +1,50 @@
+/*
+ *
+ * (c) 2005-2009 Laurent Vivier <Laurent@vivier.eu>
+ *
+ * This file has been copied from EMILE, http://emile.sf.net
+ *
+ */
+
+#include "libiso9660.h"
+#include "libopenbios/bindings.h"
+#include "libc/diskio.h"
+
+#define offsetof(t,m)  ((long)&(((t *)0)->m))
+
+static void read_extent(iso9660_DIR *dir)
+{
+       seek_io(dir->volume->fd, dir->extent * ISOFS_BLOCK_SIZE);
+       read_io(dir->volume->fd, dir->buffer, ISOFS_BLOCK_SIZE);
+
+       dir->len -= ISOFS_BLOCK_SIZE;
+       dir->extent ++;
+       dir->index = 0;
+}
+
+struct iso_directory_record *iso9660_readdir(iso9660_DIR *dir)
+{
+       struct iso_directory_record *idr;
+
+       if (dir->index >
+           ISOFS_BLOCK_SIZE - offsetof(struct iso_directory_record, name[0]))
+       {
+               if (dir->len <= 0)
+                       return NULL;
+
+               read_extent(dir);
+       }
+
+       idr = (struct iso_directory_record *) &dir->buffer[dir->index];
+       if (idr->length[0] == 0)  {
+               if (dir->len <= 0)
+                       return NULL;
+
+               read_extent(dir);
+               idr = (struct iso_directory_record *) &dir->buffer[dir->index];
+       }
+
+       dir->index += dir->buffer[dir->index];
+
+       return idr;
+}