config.cpp

#include "config.h"
#include "defines.h"
#include <array>
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <sstream>

namespace {

constexpr auto default_config = R"CONF(
!2.4.0.27
update addr 0x2b2534
updateType str int4
create addr 0x2b47c0
shutdown addr 0x2b4764
wait addr 0x2b3ffc
getInstance addr 0x2b2a54

!2.4.1.30
update addr 0x2b255c
updateType str int4
create addr 0x2b47e8
shutdown addr 0x2b478c
wait addr 0x2b4024
getInstance addr 0x2b2a7c

!2.5.0.27
update addr 0x2c050c
updateType str int4
create addr 0x2c2798
shutdown addr 0x2c273c
wait addr 0x2c1fd4
getInstance addr 0x2c0a2c

!2.5.1.47
update addr 0x2c0664
updateType str int4
create addr 0x2c28f0
shutdown addr 0x2c2894
wait addr 0x2c212c
getInstance addr 0x2c0b84

!2.6.1.71
update addr 0x311c10
updateType str int4
create addr 0x314178
shutdown addr 0x31411c
wait addr 0x31369c
getInstance addr 0x312128

!2.6.2.75
update addr 0x311c00
updateType str int4
create addr 0x314168
shutdown addr 0x31410c
wait addr 0x31368c
getInstance addr 0x312118

!2.7.0.51
update addr 0x32373c
updateType str int4
create addr 0x325ca8
shutdown addr 0x325c4c
wait addr 0x3251cc
getInstance addr 0x323c54

!2.7.1.53
update addr 0x32373c
updateType str int4
create addr 0x325ca8
shutdown addr 0x325c4c
wait addr 0x3251cc
getInstance addr 0x323c54

!2.8.0.98
update addr 0x3426ac
updateType str int4
create addr 0x344c18
shutdown addr 0x344bbc
wait addr 0x34413c
getInstance addr 0x342bc8

!2.9.0.153
update addr 0x3aa5c4
updateType str QRect
create addr 0x3ac9d8
shutdown addr 0x3ac97c
wait addr 0x3abefc
getInstance addr 0x3a0e7c

!2.9.0.210
update addr 0x3adc0c
updateType str QRect
create addr 0x3b0020
shutdown addr 0x3affc4
wait addr 0x3af544
getInstance addr 0x3a44c4

!2.9.1.217
update addr 0x3afc04
updateType str QRect
create addr 0x3b2018
shutdown addr 0x3b1fbc
wait addr 0x3b153c
getInstance addr 0x3a64bc

!2.10.1.332
update addr 0x397ff4
updateType str QRect
create addr 0x39a408
shutdown addr 0x39a3ac
wait addr 0x39992c
getInstance addr 0x38e8dc

!2.10.2.356
update addr 0x398aac
updateType str QRect
create addr 0x39aec0
shutdown addr 0x39ae64
wait addr 0x39a3e4
getInstance addr 0x38f394

!2.10.3.379
update addr 0x398acc
updateType str QRect
create addr 0x39aee0
shutdown addr 0x39ae84
wait addr 0x39a404
getInstance addr 0x38f3b4

!2.11.0.433
update addr 0x3a9ccc
updateType str QRect
create addr 0x3ac124
shutdown addr 0x3ac0c8
wait addr 0x3ab604
getInstance addr 0x3a041c

!2.11.0.435
update addr 0x3a9ccc
updateType str QRect
create addr 0x3ac124
shutdown addr 0x3ac0c8
wait addr 0x3ab604
getInstance addr 0x3a041c

!2.11.0.442
update addr 0x3a9cdc
updateType str QRect
create addr 0x3ac134
shutdown addr 0x3ac0d8
wait addr 0x3ab614
getInstance addr 0x3a042c

!2.12.1.527
update addr 0x3d72bc
updateType str QRect
create addr 0x3d9714
shutdown addr 0x3d96b8
wait addr 0x3d8bf4
getInstance addr 0x3cda0c

!2.12.2.573
update addr 0x3edff4
updateType str QRect
create addr 0x3f0138
shutdown addr 0x3f00d0
wait addr 0x3ef704
getInstance addr 0x3e4ddc

!2.12.3.606
update addr 0x3ee704
updateType str QRect
create addr 0x3f0848
shutdown addr 0x3f07e0
wait addr 0x3efe14
getInstance addr 0x3e54ec

!2.13.0.689
update addr 0X45899c
updateType str QRect
create addr 0x45aae0
shutdown addr 0x45aa78
wait addr 0x45a0ac
getInstance addr 0x44f784

!2.13.0.758
update addr 0x4589fc
updateType str QRect
create addr 0x45ab40
shutdown addr 0x45aad8
wait addr 0x45a10c
getInstance addr 0x44f7e4

!2.14.0.830
update addr 0x4931c4
updateType str QRect
create addr 0x495308
shutdown addr 0x4952a0
wait addr 0x4948d4
getInstance addr 0x489fac

!2.14.0.861
update addr 0x4931c4
updateType str QRect
create addr 0x495308
shutdown addr 0x4952a0
wait addr 0x4948d4
getInstance addr 0x489fac

!2.14.1.866
update addr 0x4931c4
updateType str QRect
create addr 0x495308
shutdown addr 0x4952a0
wait addr 0x4948d4
getInstance addr 0x489fac

!2.14.3.925
update addr 0x4bfb1c
updateType str QRect
create addr 0x4c2740
shutdown addr 0x4c26d8
wait addr 0x4c16e0
getInstance addr 0x4b66a4

!2.14.3.940
update addr 0x4bfb1c
updateType str QRect
create addr 0x4c2740
shutdown addr 0x4c26d8
wait addr 0x4c16e0
getInstance addr 0x4b66a4

!2.14.3.942
update addr 0x4bfb1c
updateType str QRect
create addr 0x04c2740
shutdown addr 0x4c26d8
wait addr 0x4c16e0
getInstance addr 0x4b66a4

!2.14.3.958
update addr 0x4bfb2c
updateType str QRect
create addr 0x4c2750
shutdown addr 0x4c26e8
wait addr 0x4c16f0
getInstance addr 0x4b66b4

!2.14.3.977
update addr 0x4bfb2c
updateType str QRect
create addr 0x4c2750
shutdown addr 0x4c26e8
wait addr 0x4c16f0
getInstance addr 0x4b66b4

!2.14.3.1005
update addr 0x4bfb2c
updateType str QRect
create addr 0x4c2750
shutdown addr 0x4c26e8
wait addr 0x4c16f0
getInstance addr 0x4b66b4

!2.14.3.1047
update addr 0x4bfb2c
updateType str QRect
create addr 0x4c2750
shutdown addr 0x4c26e8
wait addr 0x4c16f0
getInstance addr 0x4b66b4

!2.14.4.46
update addr 0x4c0a0c
updateType str QRect
create addr 0x4c3630
shutdown addr 0x4c35c8
wait addr 0x4c25d0
getInstance addr 0x4b7594

!2.15.0.1011
update addr 0x4e411c
updateType str QRect
create addr 0x4e6d40
shutdown addr 0x4e6cd8
wait addr 0x4e5ce0
getInstance addr 0x4daca4

!2.15.0.1046
update addr 0x4e418c
updateType str QRect
create addr 0x4e6db0
shutdown addr 0x4e6d48
wait addr 0x4e5d50
getInstance addr 0x4dad14

!2.15.0.1052
update addr 0x4e4254
updateType str QRect
create addr 0x4e6e78
shutdown addr 0x4e6e10
wait addr 0x4e5e18
getInstance addr 0x4daddc

!2.15.0.1067
update addr 0x4e425c
updateType str QRect
create addr 0x4e6e80
shutdown addr 0x4e6e18
wait addr 0x4e5e20
getInstance addr 0x4dade4

!2.15.1.1189
update addr 0x4e48fc
updateType str QRect
create addr 0x4e7520
shutdown addr 0x4e74b8
wait addr 0x4e64c0
getInstance addr 0x4db484
notify addr 0x4d98a4

!3.0.2.1253
update addr 0x55200c
updateType str QRect
create addr 0x555148
shutdown addr 0x5550d8
wait addr 0x553ff0
getInstance addr 0x548b94

!3.0.4.1305
update addr 0x552f74
updateType str QRect
create addr 0x5560b0
shutdown addr 0x556040
wait addr 0x554f58
getInstance addr 0x549674
notify addr 0x547a94

!3.1.0.1346
update addr 0x52d90c
updateType str QRect
create addr 0x530a90
shutdown addr 0x530a20
wait addr 0x52f938
getInstance addr 0x5244d4

!3.2.2.1581
update addr 0x557aa4
updateType str QRect
create addr 0x55ad08
shutdown addr 0x55ac98
wait addr 0x559bb0
getInstance addr 0x54e284
notify addr 0x54c788

!3.2.3.1595
update addr 0x557c34
updateType str QRect
create addr 0x55ae98
shutdown addr 0x55ae28
wait addr 0x559d40
getInstance addr 0x54e414
notify addr 0x54c918

!3.3.2.1666
update addr 0x5583c8
updateType str QRect
create addr 0x55b504
shutdown addr 0x55b494
wait addr 0x55a39c
getInstance addr 0x54eeac
notify addr 0x558464
waveformClass str EPFramebuffer::Waveform
remapWave2to5 str 1

)CONF";

void read_config_file(
  const std::string& name,
  std::istream& file,
  const std::string& version,
  Config& accumulator
) {
  std::string line;
  unsigned int line_no = 1;
  bool version_matches = true;

  while (std::getline(file, line)) {
    if (line.empty() || line[0] == '#') {
      // Comment or empty line, ignore
    } else if (line[0] == '!') {
      // Start version block
      std::istringstream line_stream{line.substr(1)};
      std::string file_version;
      line_stream >> file_version;
      accumulator["version"] = file_version;

      if (file_version == version) {
        version_matches = true;
      } else {
        version_matches = false;
      }
    } else if (version_matches) {
      // Key/value for current version
      std::istringstream line_stream{line};
      std::string key, type;
      line_stream >> key >> type;

      if (type == "addr") {
        std::uint32_t value;
        line_stream.unsetf(std::ios::basefield);
        line_stream >> value;
        accumulator[key] = (char*) value;
      } else if (type == "str") {
        std::string value;
        line_stream >> value;
        accumulator[key] = value;
      } else {
        std::cerr << name << ":" << line_no << " - Ignored key of invalid "
          "type '" << type << "'" << std::endl;
      }
    }
    ++line_no;
  }
}

}

Config read_config(const std::string& version) {
  Config result;
  std::istringstream default_config_file{default_config};
  read_config_file("<default config>", default_config_file, version, result);

  constexpr std::array config_locations = {
    "/usr/share/rm2fb.conf",
    "/opt/share/rm2fb.conf",
    "/etc/rm2fb.conf",
    "/opt/etc/rm2fb.conf",
    "rm2fb.conf",
  };

  for (const auto& path : config_locations) {
    std::ifstream config_file{path};

    if (!config_file) {
#ifdef DEBUG
      std::cerr << path << " - " << std::strerror(errno) << " (skipped)" << std::endl;
#endif
      continue;
    }

#ifdef DEBUG
    std::cerr << path << " - Parsing contents" << std::endl;
#endif

    read_config_file(path, config_file, version, result);
  }

  return result;
}

Config read_config() {
  std::string version;
  std::string line;

  std::ifstream file("/usr/share/remarkable/update.conf");

  while (std::getline(file, line)) {
    if (line.rfind("REMARKABLE_RELEASE_VERSION=", 0) == 0) {
      std::istringstream line_stream{line.substr(27)};
      line_stream >> version;
      break;
    }
  }

  Config config = read_config(version);

  if (!config.empty()){
    return config;
  }

#ifdef DEBUG
    std::cerr
      << "Unable to find config for version number, looking for old build date instead"
      << std::endl;
#endif

  std::ifstream version_file_buf{"/etc/version"};

  if (!version_file_buf) {
    std::cerr << "/etc/version - " << std::strerror(errno) << "\n";
    std::exit(-1);
  }

  std::getline(version_file_buf, version);

  return read_config(version);
}