1 files changed, 43 insertions, 0 deletions
diff --git a/src/include/ipxe/zlib.h b/src/include/ipxe/zlib.h
new file mode 100644
index 000000000..29016c38e
--- /dev/null
+++ b/src/include/ipxe/zlib.h
@@ -0,0 +1,43 @@
+#ifndef _IPXE_ZLIB_H
+#define _IPXE_ZLIB_H
+
+/** @file
+ *
+ * zlib compressed images
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <byteswap.h>
+#include <ipxe/image.h>
+#include <ipxe/deflate.h>
+
+/** zlib magic header */
+union zlib_magic {
+	/** Compression method and flags */
+	uint8_t cmf;
+	/** Check value */
+	uint16_t check;
+} __attribute__ (( packed ));
+
+/**
+ * Check that zlib magic header is valid
+ *
+ * @v magic		Magic header
+ * @ret is_valid	Magic header is valid
+ */
+static inline int zlib_magic_is_valid ( union zlib_magic *magic ) {
+
+	/* Check magic value as per RFC 6713 */
+	return ( ( ( magic->cmf & 0x8f ) == 0x08 ) &&
+		 ( ( be16_to_cpu ( magic->check ) % 31 ) == 0 ) );
+}
+
+extern int zlib_deflate ( enum deflate_format format, struct deflate_chunk *in,
+			  struct image *extracted );
+
+extern struct image_type zlib_image_type __image_type ( PROBE_NORMAL );
+
+#endif /* _IPXE_ZLIB_H */