182 static int jpeg_get_byte(struct jpeg_stream *stream)  in jpeg_get_byte()  argument
184 	if (stream->curr >= stream->end)  in jpeg_get_byte()
187 	return *stream->curr++;  in jpeg_get_byte()
191 static int jpeg_get_word_be(struct jpeg_stream *stream)  in jpeg_get_word_be()  argument
195 	if (stream->curr + sizeof(__be16) > stream->end)  in jpeg_get_word_be()
198 	word = get_unaligned_be16(stream->curr);  in jpeg_get_word_be()
199 	stream->curr += sizeof(__be16);  in jpeg_get_word_be()
204 static int jpeg_skip(struct jpeg_stream *stream, size_t len)  in jpeg_skip()  argument
206 	if (stream->curr + len > stream->end)  in jpeg_skip()
209 	stream->curr += len;  in jpeg_skip()
214 static int jpeg_next_marker(struct jpeg_stream *stream)  in jpeg_next_marker()  argument
219 	while ((byte = jpeg_get_byte(stream)) >= 0) {  in jpeg_next_marker()
230 static int jpeg_reference_segment(struct jpeg_stream *stream,  in jpeg_reference_segment()  argument
235 	if (stream->curr + sizeof(__be16) > stream->end)  in jpeg_reference_segment()
238 	len = get_unaligned_be16(stream->curr);  in jpeg_reference_segment()
239 	if (stream->curr + len > stream->end)  in jpeg_reference_segment()
242 	segment->start = stream->curr;  in jpeg_reference_segment()
271 static int jpeg_parse_frame_header(struct jpeg_stream *stream, u16 sof_marker,  in jpeg_parse_frame_header()  argument
274 	int len = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
287 		p = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
297 		y = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
303 		x = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
309 		nf = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
330 			c = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
334 			h_v = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
349 			tq = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
361 		return jpeg_skip(stream, len - 2);  in jpeg_parse_frame_header()
367 static int jpeg_parse_scan_header(struct jpeg_stream *stream,  in jpeg_parse_scan_header()  argument
371 	int len = jpeg_get_word_be(stream);  in jpeg_parse_scan_header()
383 		ns = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
395 			cs = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
399 			td_ta = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
416 	return jpeg_skip(stream, skip);  in jpeg_parse_scan_header()
420 static int jpeg_parse_quantization_tables(struct jpeg_stream *stream,  in jpeg_parse_quantization_tables()  argument
424 	int len = jpeg_get_word_be(stream);  in jpeg_parse_quantization_tables()
436 		int pq_tq = jpeg_get_byte(stream);  in jpeg_parse_quantization_tables()
457 		qk = stream->curr;  in jpeg_parse_quantization_tables()
458 		ret = jpeg_skip(stream, pq ? 128 : 64);  in jpeg_parse_quantization_tables()
474 static int jpeg_parse_huffman_tables(struct jpeg_stream *stream,  in jpeg_parse_huffman_tables()  argument
478 	int len = jpeg_get_word_be(stream);  in jpeg_parse_huffman_tables()
488 		int tc_th = jpeg_get_byte(stream);  in jpeg_parse_huffman_tables()
506 		table = stream->curr;  in jpeg_parse_huffman_tables()
511 			li = jpeg_get_byte(stream);  in jpeg_parse_huffman_tables()
518 		ret = jpeg_skip(stream, mt);  in jpeg_parse_huffman_tables()
524 			tables[(tc << 1) | th].length = stream->curr - table;  in jpeg_parse_huffman_tables()
528 	return jpeg_skip(stream, len - 2);  in jpeg_parse_huffman_tables()
532 static int jpeg_parse_restart_interval(struct jpeg_stream *stream,  in jpeg_parse_restart_interval()  argument
535 	int len = jpeg_get_word_be(stream);  in jpeg_parse_restart_interval()
543 	ri = jpeg_get_word_be(stream);  in jpeg_parse_restart_interval()
552 static int jpeg_skip_segment(struct jpeg_stream *stream)  in jpeg_skip_segment()  argument
554 	int len = jpeg_get_word_be(stream);  in jpeg_skip_segment()
561 	return jpeg_skip(stream, len - 2);  in jpeg_skip_segment()
565 static int jpeg_parse_app14_data(struct jpeg_stream *stream,  in jpeg_parse_app14_data()  argument
572 	lp = jpeg_get_word_be(stream);  in jpeg_parse_app14_data()
577 	if (stream->curr + 6 > stream->end ||  in jpeg_parse_app14_data()
578 	    strncmp(stream->curr, "Adobe\0", 6))  in jpeg_parse_app14_data()
579 		return jpeg_skip(stream, lp - 2);  in jpeg_parse_app14_data()
582 	ret = jpeg_skip(stream, 11);  in jpeg_parse_app14_data()
586 	ret = jpeg_get_byte(stream);  in jpeg_parse_app14_data()
594 	return jpeg_skip(stream, skip);  in jpeg_parse_app14_data()
612 	struct jpeg_stream stream;  in v4l2_jpeg_parse_header()  local
616 	stream.curr = buf;  in v4l2_jpeg_parse_header()
617 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_header()
623 	if (jpeg_get_word_be(&stream) != SOI)  in v4l2_jpeg_parse_header()
630 	while ((marker = jpeg_next_marker(&stream)) >= 0) {  in v4l2_jpeg_parse_header()
634 			ret = jpeg_reference_segment(&stream, &out->sof);  in v4l2_jpeg_parse_header()
637 			ret = jpeg_parse_frame_header(&stream, marker,  in v4l2_jpeg_parse_header()
652 			ret = jpeg_reference_segment(&stream,  in v4l2_jpeg_parse_header()
657 				ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
660 			ret = jpeg_parse_huffman_tables(&stream,  in v4l2_jpeg_parse_header()
664 			ret = jpeg_reference_segment(&stream,  in v4l2_jpeg_parse_header()
669 				ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
672 			ret = jpeg_parse_quantization_tables(&stream,  in v4l2_jpeg_parse_header()
677 			ret = jpeg_parse_restart_interval(&stream,  in v4l2_jpeg_parse_header()
681 			ret = jpeg_parse_app14_data(&stream,  in v4l2_jpeg_parse_header()
685 			ret = jpeg_reference_segment(&stream, &out->sos);  in v4l2_jpeg_parse_header()
688 			ret = jpeg_parse_scan_header(&stream, out->scan);  in v4l2_jpeg_parse_header()
693 			out->ecs_offset = stream.curr - (u8 *)buf;  in v4l2_jpeg_parse_header()
704 			ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
726 	struct jpeg_stream stream;  in v4l2_jpeg_parse_frame_header()  local
728 	stream.curr = buf;  in v4l2_jpeg_parse_frame_header()
729 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_frame_header()
730 	return jpeg_parse_frame_header(&stream, SOF0, frame_header);  in v4l2_jpeg_parse_frame_header()
745 	struct jpeg_stream stream;  in v4l2_jpeg_parse_scan_header()  local
747 	stream.curr = buf;  in v4l2_jpeg_parse_scan_header()
748 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_scan_header()
749 	return jpeg_parse_scan_header(&stream, scan_header);  in v4l2_jpeg_parse_scan_header()
766 	struct jpeg_stream stream;  in v4l2_jpeg_parse_quantization_tables()  local
768 	stream.curr = buf;  in v4l2_jpeg_parse_quantization_tables()
769 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_quantization_tables()
770 	return jpeg_parse_quantization_tables(&stream, precision, q_tables);  in v4l2_jpeg_parse_quantization_tables()
787 	struct jpeg_stream stream;  in v4l2_jpeg_parse_huffman_tables()  local
789 	stream.curr = buf;  in v4l2_jpeg_parse_huffman_tables()
790 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_huffman_tables()
791 	return jpeg_parse_huffman_tables(&stream, huffman_tables);  in v4l2_jpeg_parse_huffman_tables()