file seek support, new test cases, AVI use file seek

data/formats/avi/structs.h

@@ -79,14 +79,14 @@ struct AVIMainHeader : AVIChunk {
 	uint32_t height;
 	uint32_t reserved[4];
 
-};
+} __attribute__((__packed__));
 
 struct AVIRect {
 	uint16_t left;
 	uint16_t top;
 	uint16_t right;
 	uint16_t bottom;
-};
+} __attribute__((__packed__));
 
 struct AVIStreamHeader : AVIChunk {
 
@@ -110,9 +110,10 @@ struct AVIStreamHeader : AVIChunk {
 	bool isVideo() const {return fccType == FOURCC("vids");}
 	bool isAudio() const {return fccType == FOURCC("auds");}
 
-};
+} __attribute__((__packed__));
 
 struct BitMapInfoHeader {
+
 	uint32_t biSize;
 	int32_t biWidth;
 	int32_t biHeight;
@@ -124,22 +125,28 @@ struct BitMapInfoHeader {
 	int32_t biYPelsPerMeter;
 	uint32_t biClrUsed;
 	uint32_t biClrImportant;
-};
+
+} __attribute__((__packed__));
 
 struct RGBQUAD {
+
 	uint8_t rgbBlue;
 	uint8_t rgbGreen;
 	uint8_t rgbRed;
 	uint8_t rgbReserved;
-};
+
+} __attribute__((__packed__));
 
 struct BitMapInfo : AVIChunk {
+
 	// <data from AVIChunk>
 	BitMapInfoHeader bmi_header;
 	RGBQUAD bmi_colors[1];
+
 };
 
 struct WaveFormat : AVIChunk {
+
 	// <data from AVIChunk>
 	uint16_t format_tag;
 	uint16_t channels;
@@ -147,21 +154,25 @@ struct WaveFormat : AVIChunk {
 	uint32_t avg_bytes_per_sec;
 	uint16_t block_align;
 	uint16_t size;
-};
+
+} __attribute__((__packed__));
 
 struct AVIIndexEntry {
+
 	uint32_t ckid;
 	uint32_t flags;
 	uint32_t chunk_offset;
 	uint32_t chunk_length;
-};
 
+} __attribute__((__packed__));
 
 
 
 
 struct ChunkInfo {
+
 	uint32_t offset;
 	uint32_t entry_offset;
 	uint32_t size;
-};
+
+} __attribute__((__packed__));