66 static int jpeg_get_byte(struct jpeg_stream *stream)  in jpeg_get_byte()  argument
68 	if (stream->curr >= stream->end)  in jpeg_get_byte()
71 	return *stream->curr++;  in jpeg_get_byte()
75 static int jpeg_get_word_be(struct jpeg_stream *stream)  in jpeg_get_word_be()  argument
79 	if (stream->curr + sizeof(__be16) > stream->end)  in jpeg_get_word_be()
82 	word = get_unaligned_be16(stream->curr);  in jpeg_get_word_be()
83 	stream->curr += sizeof(__be16);  in jpeg_get_word_be()
88 static int jpeg_skip(struct jpeg_stream *stream, size_t len)  in jpeg_skip()  argument
90 	if (stream->curr + len > stream->end)  in jpeg_skip()
93 	stream->curr += len;  in jpeg_skip()
98 static int jpeg_next_marker(struct jpeg_stream *stream)  in jpeg_next_marker()  argument
103 	while ((byte = jpeg_get_byte(stream)) >= 0) {  in jpeg_next_marker()
114 static int jpeg_reference_segment(struct jpeg_stream *stream,  in jpeg_reference_segment()  argument
119 	if (stream->curr + sizeof(__be16) > stream->end)  in jpeg_reference_segment()
122 	len = get_unaligned_be16(stream->curr);  in jpeg_reference_segment()
123 	if (stream->curr + len > stream->end)  in jpeg_reference_segment()
126 	segment->start = stream->curr;  in jpeg_reference_segment()
155 static int jpeg_parse_frame_header(struct jpeg_stream *stream, u16 sof_marker,  in jpeg_parse_frame_header()  argument
158 	int len = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
171 		p = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
181 		y = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
187 		x = jpeg_get_word_be(stream);  in jpeg_parse_frame_header()
193 		nf = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
214 			c = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
218 			h_v = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
233 			tq = jpeg_get_byte(stream);  in jpeg_parse_frame_header()
245 		return jpeg_skip(stream, len - 2);  in jpeg_parse_frame_header()
251 static int jpeg_parse_scan_header(struct jpeg_stream *stream,  in jpeg_parse_scan_header()  argument
255 	int len = jpeg_get_word_be(stream);  in jpeg_parse_scan_header()
267 		ns = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
279 			cs = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
283 			td_ta = jpeg_get_byte(stream);  in jpeg_parse_scan_header()
300 	return jpeg_skip(stream, skip);  in jpeg_parse_scan_header()
304 static int jpeg_parse_quantization_tables(struct jpeg_stream *stream,  in jpeg_parse_quantization_tables()  argument
308 	int len = jpeg_get_word_be(stream);  in jpeg_parse_quantization_tables()
320 		int pq_tq = jpeg_get_byte(stream);  in jpeg_parse_quantization_tables()
341 		qk = stream->curr;  in jpeg_parse_quantization_tables()
342 		ret = jpeg_skip(stream, pq ? 128 : 64);  in jpeg_parse_quantization_tables()
358 static int jpeg_parse_huffman_tables(struct jpeg_stream *stream,  in jpeg_parse_huffman_tables()  argument
362 	int len = jpeg_get_word_be(stream);  in jpeg_parse_huffman_tables()
372 		int tc_th = jpeg_get_byte(stream);  in jpeg_parse_huffman_tables()
390 		table = stream->curr;  in jpeg_parse_huffman_tables()
395 			li = jpeg_get_byte(stream);  in jpeg_parse_huffman_tables()
402 		ret = jpeg_skip(stream, mt);  in jpeg_parse_huffman_tables()
408 			tables[(tc << 1) | th].length = stream->curr - table;  in jpeg_parse_huffman_tables()
412 	return jpeg_skip(stream, len - 2);  in jpeg_parse_huffman_tables()
416 static int jpeg_parse_restart_interval(struct jpeg_stream *stream,  in jpeg_parse_restart_interval()  argument
419 	int len = jpeg_get_word_be(stream);  in jpeg_parse_restart_interval()
427 	ri = jpeg_get_word_be(stream);  in jpeg_parse_restart_interval()
436 static int jpeg_skip_segment(struct jpeg_stream *stream)  in jpeg_skip_segment()  argument
438 	int len = jpeg_get_word_be(stream);  in jpeg_skip_segment()
445 	return jpeg_skip(stream, len - 2);  in jpeg_skip_segment()
449 static int jpeg_parse_app14_data(struct jpeg_stream *stream,  in jpeg_parse_app14_data()  argument
456 	lp = jpeg_get_word_be(stream);  in jpeg_parse_app14_data()
461 	if (stream->curr + 6 > stream->end ||  in jpeg_parse_app14_data()
462 	    strncmp(stream->curr, "Adobe\0", 6))  in jpeg_parse_app14_data()
466 	ret = jpeg_skip(stream, 11);  in jpeg_parse_app14_data()
470 	ret = jpeg_get_byte(stream);  in jpeg_parse_app14_data()
478 	return jpeg_skip(stream, skip);  in jpeg_parse_app14_data()
496 	struct jpeg_stream stream;  in v4l2_jpeg_parse_header()  local
500 	stream.curr = buf;  in v4l2_jpeg_parse_header()
501 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_header()
507 	if (jpeg_get_word_be(&stream) != SOI)  in v4l2_jpeg_parse_header()
514 	while ((marker = jpeg_next_marker(&stream)) >= 0) {  in v4l2_jpeg_parse_header()
518 			ret = jpeg_reference_segment(&stream, &out->sof);  in v4l2_jpeg_parse_header()
521 			ret = jpeg_parse_frame_header(&stream, marker,  in v4l2_jpeg_parse_header()
536 			ret = jpeg_reference_segment(&stream,  in v4l2_jpeg_parse_header()
541 				ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
544 			ret = jpeg_parse_huffman_tables(&stream,  in v4l2_jpeg_parse_header()
548 			ret = jpeg_reference_segment(&stream,  in v4l2_jpeg_parse_header()
553 				ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
556 			ret = jpeg_parse_quantization_tables(&stream,  in v4l2_jpeg_parse_header()
561 			ret = jpeg_parse_restart_interval(&stream,  in v4l2_jpeg_parse_header()
565 			ret = jpeg_parse_app14_data(&stream,  in v4l2_jpeg_parse_header()
569 			ret = jpeg_reference_segment(&stream, &out->sos);  in v4l2_jpeg_parse_header()
572 			ret = jpeg_parse_scan_header(&stream, out->scan);  in v4l2_jpeg_parse_header()
577 			out->ecs_offset = stream.curr - (u8 *)buf;  in v4l2_jpeg_parse_header()
588 			ret = jpeg_skip_segment(&stream);  in v4l2_jpeg_parse_header()
610 	struct jpeg_stream stream;  in v4l2_jpeg_parse_frame_header()  local
612 	stream.curr = buf;  in v4l2_jpeg_parse_frame_header()
613 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_frame_header()
614 	return jpeg_parse_frame_header(&stream, SOF0, frame_header);  in v4l2_jpeg_parse_frame_header()
629 	struct jpeg_stream stream;  in v4l2_jpeg_parse_scan_header()  local
631 	stream.curr = buf;  in v4l2_jpeg_parse_scan_header()
632 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_scan_header()
633 	return jpeg_parse_scan_header(&stream, scan_header);  in v4l2_jpeg_parse_scan_header()
650 	struct jpeg_stream stream;  in v4l2_jpeg_parse_quantization_tables()  local
652 	stream.curr = buf;  in v4l2_jpeg_parse_quantization_tables()
653 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_quantization_tables()
654 	return jpeg_parse_quantization_tables(&stream, precision, q_tables);  in v4l2_jpeg_parse_quantization_tables()
671 	struct jpeg_stream stream;  in v4l2_jpeg_parse_huffman_tables()  local
673 	stream.curr = buf;  in v4l2_jpeg_parse_huffman_tables()
674 	stream.end = stream.curr + len;  in v4l2_jpeg_parse_huffman_tables()
675 	return jpeg_parse_huffman_tables(&stream, huffman_tables);  in v4l2_jpeg_parse_huffman_tables()