Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_executable(tzdb2nx
+    main.cpp
+    tzif.cpp
+    tzif.h)
+
+set(TZDB2NX_PATH "$<TARGET_FILE:tzdb2nx>" CACHE PATH "Path to tzdb2nx path")

externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/main.cpp

@@ -0,0 +1,158 @@
+#include "tzif.h"
+#include <array>
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+#include <fcntl.h>
+#include <getopt.h>
+#include <poll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+constexpr std::size_t ten_megabytes{(1 << 20) * 10};
+
+static void ShortHelp(const char *argv0) {
+  std::fprintf(stderr, "Usage: %s [INFILE] [OUTFILE]\n", argv0);
+}
+
+static void PrintArg(const char *short_arg, const char *long_arg,
+                     const char *text) {
+  std::fprintf(stderr, "%5s, %-20s %s\n", short_arg, long_arg, text);
+}
+
+static void PrintHelp(const char *argv0) {
+  ShortHelp(argv0);
+  std::fprintf(stderr,
+               "Converts a TZif file INFILE from the RFC8536 format to a "
+               "Nintendo Switch compatible file OUTFILE.\nWith no arguments, "
+               "tzdb2nx can read and write from stdin/stdout, "
+               "respectively.\nGiving no arguments without input will print "
+               "usage information and exit the program.\n\nArguments:\n");
+  PrintArg("-h", "--help", "Print this help text and exit");
+}
+
+int main(int argc, char *argv[]) {
+  int f{STDIN_FILENO};
+  const char *filename{"(stdin)"};
+  std::size_t filesize{ten_megabytes};
+
+  const char *optstring = "h";
+  int c;
+  const struct option longopts[] = {
+      {
+          "help",
+          no_argument,
+          nullptr,
+          'h',
+      },
+      {
+          nullptr,
+          0,
+          nullptr,
+          0,
+      },
+  };
+
+  while ((c = getopt_long(argc, argv, optstring, longopts, nullptr)) != -1) {
+    switch (c) {
+    case 'h':
+      PrintHelp(argv[0]);
+      return -1;
+    case '?':
+      ShortHelp(argv[0]);
+      return -1;
+    }
+  }
+
+  if (argc > 1) {
+    filename = argv[1];
+    f = open(filename, O_RDONLY);
+
+    if (f == -1) {
+      const int err = errno;
+      std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+      return err;
+    }
+
+    struct stat statbuf;
+    fstat(f, &statbuf);
+
+    filesize = statbuf.st_size;
+  } else {
+    struct pollfd fds {
+      f, POLLIN, 0,
+    };
+
+    const int result = poll(&fds, 1, 0);
+    if (result == 0) {
+      std::fprintf(stderr, "%s: No input\n", filename);
+      ShortHelp(argv[0]);
+      return -1;
+    }
+  }
+
+  u_int8_t *buf = new u_int8_t[filesize];
+
+  filesize = read(f, buf, filesize);
+  if (filesize == static_cast<std::size_t>(-1)) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+  int result = close(f);
+  if (result == -1) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+
+  if (filesize < 4) {
+    std::fprintf(stderr, "%s: Too small\n", filename);
+    return -1;
+  }
+  if (std::strncmp(reinterpret_cast<const char *>(buf), "TZif", 4) != 0) {
+    std::fprintf(stderr, "%s: Bad magic number\n", filename);
+    return -1;
+  }
+
+  const std::unique_ptr<Tzif::Data> tzif_data = Tzif::ReadData(buf, filesize);
+  if (tzif_data == nullptr) {
+    std::fprintf(stderr, "%s: Error occured while reading data\n", filename);
+    return -1;
+  }
+
+  delete[] buf;
+
+  std::vector<u_int8_t> output_buffer;
+  tzif_data->ReformatNintendo(output_buffer);
+
+  filename = "(stdout)";
+  f = STDOUT_FILENO;
+  if (argc > 2) {
+    filename = argv[2];
+    f = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0664);
+
+    if (f == -1) {
+      const int err = errno;
+      std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+      return err;
+    }
+  }
+
+  result = write(f, output_buffer.data(), output_buffer.size());
+  if (result == -1) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+
+  result = close(f);
+  if (result == -1) {
+    const int err = errno;
+    std::fprintf(stderr, "%s: %s\n", filename, std::strerror(err));
+    return err;
+  }
+
+  return 0;
+}

externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/tzif.cpp

@@ -0,0 +1,146 @@
+#include "tzif.h"
+#include <cstdint>
+#include <cstring>
+#include <memory>
+#include <sys/types.h>
+
+namespace Tzif {
+
+static std::size_t SkipToVersion2(const u_int8_t *data, std::size_t size) {
+  char magic[5];
+  const u_int8_t *p{data};
+
+  std::memcpy(magic, data, 4);
+  magic[4] = '\0';
+
+  if (std::strcmp(magic, "TZif") != 0) {
+    return -1;
+  }
+
+  do {
+    p++;
+    if (p >= data + size) {
+      return -1;
+    }
+  } while (std::strncmp(reinterpret_cast<const char *>(p), "TZif", 4) != 0);
+
+  return p - data;
+}
+
+template <typename Type> constexpr static void SwapEndianess(Type *value) {
+  u_int8_t *data = reinterpret_cast<u_int8_t *>(value);
+
+  union {
+    u_int8_t data[sizeof(Type)];
+    Type value;
+  } temp;
+
+  for (u_int32_t i = 0; i < sizeof(Type); i++) {
+    u_int32_t alt_index = sizeof(Type) - i - 1;
+    temp.data[alt_index] = data[i];
+  }
+
+  *value = temp.value;
+}
+
+static void FlipHeader(Header &header) {
+  SwapEndianess(&header.isutcnt);
+  SwapEndianess(&header.isstdcnt);
+  SwapEndianess(&header.leapcnt);
+  SwapEndianess(&header.timecnt);
+  SwapEndianess(&header.typecnt);
+  SwapEndianess(&header.charcnt);
+}
+
+std::unique_ptr<DataImpl> ReadData(const u_int8_t *data, std::size_t size) {
+  const std::size_t v2_offset = SkipToVersion2(data, size);
+  if (v2_offset == static_cast<std::size_t>(-1)) {
+    return nullptr;
+  }
+
+  const u_int8_t *p = data + v2_offset;
+
+  Header header;
+  std::memcpy(&header, p, sizeof(header));
+  p += sizeof(header);
+
+  FlipHeader(header);
+
+  const std::size_t data_block_length =
+      header.timecnt * sizeof(int64_t) + header.timecnt * sizeof(u_int8_t) +
+      header.typecnt * sizeof(TimeTypeRecord) +
+      header.charcnt * sizeof(int8_t) + header.isstdcnt * sizeof(u_int8_t) +
+      header.isutcnt * sizeof(u_int8_t);
+
+  if (v2_offset + data_block_length + sizeof(Header) > size) {
+    return nullptr;
+  }
+
+  std::unique_ptr<DataImpl> impl = std::make_unique<DataImpl>();
+  impl->header = header;
+
+  const auto copy =
+      []<typename Type>(std::unique_ptr<Type[]> &array, int length,
+                        const u_int8_t *const &ptr) -> const u_int8_t * {
+    const std::size_t region_length = length * sizeof(Type);
+    array = std::make_unique<Type[]>(length);
+    std::memcpy(array.get(), ptr, region_length);
+    return ptr + region_length;
+  };
+
+  p = copy(impl->transition_times, header.timecnt, p);
+  p = copy(impl->transition_types, header.timecnt, p);
+  p = copy(impl->local_time_type_records, header.typecnt, p);
+  p = copy(impl->time_zone_designations, header.charcnt, p);
+  p = copy(impl->standard_indicators, header.isstdcnt, p);
+  p = copy(impl->ut_indicators, header.isutcnt, p);
+
+  const std::size_t footer_string_length = data + size - p - 2;
+  p++;
+
+  if (p + footer_string_length > data + size ||
+      p + footer_string_length < data) {
+    return nullptr;
+  }
+
+  impl->footer.tz_string = std::make_unique<char[]>(footer_string_length);
+  std::memcpy(impl->footer.tz_string.get(), p, footer_string_length);
+  impl->footer.footer_string_length = footer_string_length;
+
+  return impl;
+}
+
+static void PushToBuffer(std::vector<u_int8_t> &buffer, const void *data,
+                         std::size_t size) {
+  const u_int8_t *p{reinterpret_cast<const u_int8_t *>(data)};
+  for (std::size_t i = 0; i < size; i++) {
+    buffer.push_back(*p);
+    p++;
+  }
+}
+
+void DataImpl::ReformatNintendo(std::vector<u_int8_t> &buffer) const {
+  buffer.clear();
+
+  Header header_copy{header};
+  header_copy.isstdcnt = 0;
+  header_copy.isutcnt = 0;
+  FlipHeader(header_copy);
+
+  PushToBuffer(buffer, &header_copy, sizeof(Header));
+  PushToBuffer(buffer, transition_times.get(),
+               header.timecnt * sizeof(int64_t));
+  PushToBuffer(buffer, transition_types.get(),
+               header.timecnt * sizeof(u_int8_t));
+  PushToBuffer(buffer, local_time_type_records.get(),
+               header.typecnt * sizeof(TimeTypeRecord));
+  PushToBuffer(buffer, time_zone_designations.get(),
+               header.charcnt * sizeof(int8_t));
+  // omit standard_indicators
+  // omit ut_indicators
+  PushToBuffer(buffer, &footer.nl_a, 1);
+  PushToBuffer(buffer, footer.tz_string.get(), footer.footer_string_length);
+  PushToBuffer(buffer, &footer.nl_b, 1);
+}
+
+} // namespace Tzif

externals/nx_tzdb/tzdb_to_nx/src/tzdb2nx/tzif.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include <array>
+#include <memory>
+#include <sys/types.h>
+#include <vector>
+
+namespace Tzif {
+
+typedef struct {
+  char magic[4];
+  u_int8_t version;
+  u_int8_t reserved[15];
+  u_int32_t isutcnt;
+  u_int32_t isstdcnt;
+  u_int32_t leapcnt;
+  u_int32_t timecnt;
+  u_int32_t typecnt;
+  u_int32_t charcnt;
+} Header;
+static_assert(sizeof(Header) == 0x2c);
+
+class Footer {
+public:
+  explicit Footer() = default;
+  ~Footer() = default;
+
+  const char nl_a{'\n'};
+  std::unique_ptr<char[]> tz_string;
+  const char nl_b{'\n'};
+
+  std::size_t footer_string_length;
+};
+
+#pragma pack(push, 1)
+typedef struct {
+  u_int32_t utoff;
+  u_int8_t dst;
+  u_int8_t idx;
+} TimeTypeRecord;
+#pragma pack(pop)
+static_assert(sizeof(TimeTypeRecord) == 0x6);
+
+class Data {
+public:
+  explicit Data() = default;
+  virtual ~Data() = default;
+
+  virtual void ReformatNintendo(std::vector<u_int8_t> &buffer) const = 0;
+};
+
+class DataImpl : public Data {
+public:
+  explicit DataImpl() = default;
+  ~DataImpl() override = default;
+
+  void ReformatNintendo(std::vector<u_int8_t> &buffer) const override;
+
+  Header header;
+  Footer footer;
+
+  std::unique_ptr<int64_t[]> transition_times;
+  std::unique_ptr<u_int8_t[]> transition_types;
+  std::unique_ptr<TimeTypeRecord[]> local_time_type_records;
+  std::unique_ptr<int8_t[]> time_zone_designations;
+  std::unique_ptr<u_int8_t[]> standard_indicators;
+  std::unique_ptr<u_int8_t[]> ut_indicators;
+};
+
+std::unique_ptr<DataImpl> ReadData(const u_int8_t *data, std::size_t size);
+
+} // namespace Tzif