Initial community commit

Src/nsavi/read.h

@@ -0,0 +1,38 @@
+#pragma once
+#include "bfc/platform/types.h"
+#include "avi_reader.h"
+
+
+namespace nsavi
+{
+	class avi_reader;
+#pragma pack(push, 4)
+	struct riff_chunk
+	{
+		uint32_t id;
+		uint32_t size;
+		uint32_t type; // if id is LIST or RIFF, this will be set
+	};
+#pragma pack(pop)
+
+	
+	enum ParseState
+	{
+		NOT_READ = 0,
+		PARSED = 1,
+		NOT_FOUND = 2,
+		PARSE_ERROR = 3,
+		FOUND = 4, // we know where it is, but we havn't read it
+		PARSE_RESYNC = 5, // read was aborted (return code < 0). need to resync inside the avi_reader
+
+	};
+
+	#define nsaviFOURCC( ch0, ch1, ch2, ch3 )	((uint32_t)(uint8_t)(ch0) | ((uint32_t)(uint8_t)(ch1) << 8 ) | ((uint32_t)(uint8_t)(ch2) << 16 ) | ( (uint32_t)(uint8_t)(ch3) << 24 ))
+
+		// negative return codes are 'pass-thru' from the the avi_reader object
+	// interpret accordingly (e.g. in_avi might abort a long network i/o on stop or seek)
+	int read_riff_chunk(nsavi::avi_reader *reader, riff_chunk *chunk, uint32_t *bytes_read=0);
+	int skip_chunk(nsavi::avi_reader *reader, const nsavi::riff_chunk *chunk, uint32_t *out_bytes_read=0);
+
+
+}