Initial community commit

Src/nsmkv/header.h

@@ -0,0 +1,79 @@
+#pragma once
+#include <bfc/platform/types.h>
+#include "mkv_reader.h"
+
+// IDs
+// these are slightly different from the matroska spec because we specify
+// values after vint decoding and they specify before
+const uint32_t mkv_header=0xa45dfa3;
+const uint32_t mkv_header_ebml_version=0x286;
+const uint32_t mkv_header_ebml_read_version=0x2f7;
+const uint32_t mkv_header_ebml_max_id_length=0x2f2;
+const uint32_t mkv_header_ebml_max_size_length=0x2f3;
+const uint32_t mkv_header_doctype=0x282;
+const uint32_t mkv_header_doctype_read_version=0x285;
+const uint32_t mkv_header_doctype_version=0x287;
+
+namespace nsmkv
+{
+	class Header
+	{
+	public:
+		// defaults provided as per spec for matroska
+		// *_found variables indicate whether the field was found in the file
+		Header() :
+			ebml_version(1), 
+			ebml_read_version(1),
+			ebml_max_id_length(4),
+			ebml_max_size_length(8),
+			doctype(0),
+			doctype_version(1),
+			doctype_read_version(1),
+			ebml_header_found(false)
+#ifdef WA_VALIDATE
+			,
+			ebml_version_found(false),
+			ebml_read_version_found(false),
+			ebml_max_id_length_found(false),
+			ebml_max_size_length_found(false),
+			doctype_version_found(false),
+			doctype_found(false),
+			doctype_read_version_found(false)
+#endif
+		{
+		}
+		~Header()
+		{
+			if (doctype)
+				free(doctype);
+		}
+		void OwnDocType(char *_doctype)
+		{
+			if (doctype)
+				free(doctype);
+			doctype = _doctype;
+		}
+
+		uint64_t ebml_version;
+		uint64_t ebml_read_version;
+		uint64_t ebml_max_id_length;
+		uint64_t ebml_max_size_length;
+		char *doctype;
+		uint64_t doctype_version;
+		uint64_t doctype_read_version;
+		bool ebml_header_found;
+
+#ifdef WA_VALIDATE
+		bool ebml_version_found;
+		bool ebml_read_version_found;
+		bool ebml_max_id_length_found;
+		bool doctype_found;
+		bool ebml_max_size_length_found;
+		bool doctype_version_found;
+		bool doctype_read_version_found;
+#endif
+	};
+
+	// returns bytes read.  0 means EOF
+	uint64_t ReadHeader(nsmkv::MKVReader *reader, uint64_t size, nsmkv::Header &header);
+};