parse-ls-ext-block.cpp

   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 <hverkuil-cisco@xs4all.nl>
   6  */
   7
   8 #include "edid-decode.h"
   9
  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
  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
  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         unused_bytes = orig + 127 - x;
  68         if (!memchk(x, unused_bytes)) {
  69                 data_block.clear();
  70                 fail("Non-zero values in unused space.\n");
  71         }
  72 }