1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright 2019-2020 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
4 *
5 * Author: Hans Verkuil <[email protected]>
6 */
7
8 #include "edid-decode.h"
9
parse_string(const char * name,const unsigned char * x)10 static void parse_string(const char *name, const unsigned char *x)
11 {
12 if (!*x)
13 return;
14 printf(" %s: ", name);
15 hex_block("", x + 1, *x, true, *x);
16 }
17
parse_string_table(const unsigned char * x)18 void edid_state::parse_string_table(const unsigned char *x)
19 {
20 printf(" UTF Type: ");
21 switch (x[0] & 7) {
22 case 0: printf("UTF 8\n"); break;
23 case 1: printf("UTF 16BE\n"); break;
24 case 2: printf("UTF 32BE\n"); break;
25 default:
26 printf("Unknown (0x%02x)\n", x[0] & 7);
27 fail("Unknown UTF Type (0x%02x).\n", x[0] & 7);
28 break;
29 }
30 printf(" Country Code ID (ISO 3166-3): %u\n", ((x[1] & 0x3f) << 8) | x[2]);
31
32 if (x[3] || x[4]) {
33 char name[4];
34
35 name[0] = ((x[3] & 0x7c) >> 2) + '@';
36 name[1] = ((x[3] & 0x03) << 3) + ((x[4] & 0xe0) >> 5) + '@';
37 name[2] = (x[4] & 0x1f) + '@';
38 name[3] = 0;
39 if (name[0] == '@') name[0] = ' ';
40 if (name[1] == '@') name[1] = ' ';
41 if (name[2] == '@') name[2] = ' ';
42 printf(" Language ID: '%s'\n", name);
43 }
44 x += 5;
45 parse_string("Manufacturer Name", x);
46 x += x[0] + 1;
47 parse_string("Model Name", x);
48 x += x[0] + 1;
49 if (hide_serial_numbers)
50 printf(" Serial Number: ...\n");
51 else
52 parse_string("Serial Number", x);
53 }
54
parse_ls_ext_block(const unsigned char * x)55 void edid_state::parse_ls_ext_block(const unsigned char *x)
56 {
57 const unsigned char *orig = x;
58
59 printf(" Version: %u.%u\n Unicode Version: %u.%u.%u\n",
60 x[1], x[2], (x[3] >> 4), x[3] & 0x0f, x[4]);
61 x += 5;
62
63 while (x[0] && x + x[0] < orig + 127) {
64 parse_string_table(x + 1);
65 x += x[0];
66 }
67 if (!memchk(x, orig + 127 - x)) {
68 data_block.clear();
69 fail("Non-zero values in unused space.\n");
70 }
71 }
72