65 static int jpeg_get_byte(struct jpeg_stream *stream)  in jpeg_get_byte()  argument
67 	if (stream->curr >= stream->end)  in jpeg_get_byte()
70 	return *stream->curr++;  in jpeg_get_byte()
74 static int jpeg_get_word_be(struct jpeg_stream *stream)  in jpeg_get_word_be()  argument
78 	if (stream->curr + sizeof(__be16) > stream->end)  in jpeg_get_word_be()
81 	word = get_unaligned_be16(stream->curr);  in jpeg_get_word_be()
82 	stream->curr += sizeof(__be16);  in jpeg_get_word_be()
87 static int jpeg_skip(struct jpeg_stream *stream, size_t len)  in jpeg_skip()  argument
89 	if (stream->curr + len > stream->end)  in jpeg_skip()
92 	stream->curr += len;  in jpeg_skip()
97 static int jpeg_next_marker(struct jpeg_stream *stream)  in jpeg_next_marker()  argument
102 	while ((byte = jpeg_get_byte(stream)) >= 0) {  in jpeg_next_marker()
113 static int jpeg_reference_segment(struct jpeg_stream *stream,  in jpeg_reference_segment()  argument
118 	if (stream->curr + sizeof(__be16) > stream->end)  in jpeg_reference_segment()
121 	len = get_unaligned_be16(stream->curr);  in jpeg_reference_segment()
122 	if (stream->curr + len > stream->end)  in jpeg_reference_segment()
125 	segment->start = stream->curr;  in jpeg_reference_segment()
154 static int jpeg_parse_frame_header(struct jpeg_stream *stream, u16 sof_marker,  in jpeg_parse_frame_header()  argument
157 	int len = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
170 		p = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
180 		y = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
186 		x = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
192 		nf = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
213 			c = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
217 			h_v = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
232 			tq = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
244 		return jpeg_skip(stream, len - 2);  in jpeg_parse_frame_header()
250 static int jpeg_parse_scan_header(struct jpeg_stream *stream,  in jpeg_parse_scan_header()  argument
254 	int len = jpeg_get_word_be(stream);  in jpeg_parse_scan_header()
266 		ns = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
278 			cs = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
282 			td_ta = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
299 	return jpeg_skip(stream, skip);  in jpeg_parse_scan_header()
303 static int jpeg_parse_quantization_tables(struct jpeg_stream *stream,  in jpeg_parse_quantization_tables()  argument
307 	int len = jpeg_get_word_be(stream);  in jpeg_parse_quantization_tables()
319 		int pq_tq = jpeg_get_byte(stream);  in jpeg_parse_quantization_tables()
340 		qk = stream->curr;  in jpeg_parse_quantization_tables()
341 		ret = jpeg_skip(stream, pq ? 128 : 64);  in jpeg_parse_quantization_tables()
357 static int jpeg_parse_huffman_tables(struct jpeg_stream *stream,  in jpeg_parse_huffman_tables()  argument
361 	int len = jpeg_get_word_be(stream);  in jpeg_parse_huffman_tables()
371 		int tc_th = jpeg_get_byte(stream);  in jpeg_parse_huffman_tables()
389 		table = stream->curr;  in jpeg_parse_huffman_tables()
394 			li = jpeg_get_byte(stream);  in jpeg_parse_huffman_tables()
401 		ret = jpeg_skip(stream, mt);  in jpeg_parse_huffman_tables()
407 			tables[(tc << 1) | th].length = stream->curr - table;  in jpeg_parse_huffman_tables()
411 	return jpeg_skip(stream, len - 2);  in jpeg_parse_huffman_tables()
415 static int jpeg_parse_restart_interval(struct jpeg_stream *stream,  in jpeg_parse_restart_interval()  argument
418 	int len = jpeg_get_word_be(stream);  in jpeg_parse_restart_interval()
426 	ri = jpeg_get_word_be(stream);  in jpeg_parse_restart_interval()
435 static int jpeg_skip_segment(struct jpeg_stream *stream)  in jpeg_skip_segment()  argument
437 	int len = jpeg_get_word_be(stream);  in jpeg_skip_segment()
444 	return jpeg_skip(stream, len - 2);  in jpeg_skip_segment()
462 	struct jpeg_stream stream;  in v4l2_jpeg_parse_header()  local
466 	stream.curr = buf;  in v4l2_jpeg_parse_header()
467 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_header()
473 	marker = jpeg_next_marker(&stream);  in v4l2_jpeg_parse_header()
480 	while ((marker = jpeg_next_marker(&stream)) >= 0) {  in v4l2_jpeg_parse_header()
484 			ret = jpeg_reference_segment(&stream, &out->sof);  in v4l2_jpeg_parse_header()
487 			ret = jpeg_parse_frame_header(&stream, marker,  in v4l2_jpeg_parse_header()
502 			ret = jpeg_reference_segment(&stream,  in v4l2_jpeg_parse_header()
506 			ret = jpeg_parse_huffman_tables(&stream,  in v4l2_jpeg_parse_header()
510 			ret = jpeg_reference_segment(&stream,  in v4l2_jpeg_parse_header()
514 			ret = jpeg_parse_quantization_tables(&stream,  in v4l2_jpeg_parse_header()
519 			ret = jpeg_parse_restart_interval(&stream,  in v4l2_jpeg_parse_header()
524 			ret = jpeg_reference_segment(&stream, &out->sos);  in v4l2_jpeg_parse_header()
527 			ret = jpeg_parse_scan_header(&stream, out->scan);  in v4l2_jpeg_parse_header()
532 			out->ecs_offset = stream.curr - (u8 *)buf;  in v4l2_jpeg_parse_header()
543 			ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
565 	struct jpeg_stream stream;  in v4l2_jpeg_parse_frame_header()  local
567 	stream.curr = buf;  in v4l2_jpeg_parse_frame_header()
568 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_frame_header()
569 	return jpeg_parse_frame_header(&stream, SOF0, frame_header);  in v4l2_jpeg_parse_frame_header()
584 	struct jpeg_stream stream;  in v4l2_jpeg_parse_scan_header()  local
586 	stream.curr = buf;  in v4l2_jpeg_parse_scan_header()
587 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_scan_header()
588 	return jpeg_parse_scan_header(&stream, scan_header);  in v4l2_jpeg_parse_scan_header()
605 	struct jpeg_stream stream;  in v4l2_jpeg_parse_quantization_tables()  local
607 	stream.curr = buf;  in v4l2_jpeg_parse_quantization_tables()
608 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_quantization_tables()
609 	return jpeg_parse_quantization_tables(&stream, precision, q_tables);  in v4l2_jpeg_parse_quantization_tables()
626 	struct jpeg_stream stream;  in v4l2_jpeg_parse_huffman_tables()  local
628 	stream.curr = buf;  in v4l2_jpeg_parse_huffman_tables()
629 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_huffman_tables()
630 	return jpeg_parse_huffman_tables(&stream, huffman_tables);  in v4l2_jpeg_parse_huffman_tables()