i18n.cpp File Reference

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <string>
#include <map>
#include "file_io_utils.h"
#include "common/i18n.h"
#include "translation_files.h"

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Macros
#define	ELECTRONEUM_DEFAULT_LOG_CATEGORY   "i18n"
#define	MAX_LANGUAGE_SIZE   16
#define	i18n_log(x)   ((void)0)

Functions
std::string	i18n_get_language ()
int	i18n_set_language (const char *directory, const char *base, std::string language)
const char *	i18n_translate (const char *s, const std::string &context)

Macro Definition Documentation

ELECTRONEUM_DEFAULT_LOG_CATEGORY

#define ELECTRONEUM_DEFAULT_LOG_CATEGORY   "i18n"

Definition at line 40 of file i18n.cpp.

i18n_log

#define i18n_log

(

x

)

((void)0)

Definition at line 51 of file i18n.cpp.

MAX_LANGUAGE_SIZE

#define MAX_LANGUAGE_SIZE   16

Definition at line 42 of file i18n.cpp.

Function Documentation

i18n_get_language()

std::string i18n_get_language

(

)

Definition at line 53 of file i18n.cpp.

{
  const char *e;
 
  e = getenv("LANG");
  i18n_log("LANG=" << e);
  if (!e || !*e) {
    e = getenv("LC_ALL");
    i18n_log("LC_ALL=" << e);
  }
  if (!e || !*e)
    e = "en";
 
  std::string language = e;
  language = language.substr(0, language.find("."));
  language = language.substr(0, language.find("@"));
 
  // check valid values
  for (char c: language)
    if (!strchr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-.@", c))
      return "en";
 
  std::transform(language.begin(), language.end(), language.begin(), tolower);
  if (language.size() > MAX_LANGUAGE_SIZE)
  {
    i18n_log("Language from LANG/LC_ALL suspiciously long, defaulting to en");
    return "en";
  }
  return language;
}

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i18n_set_language()

int i18n_set_language	(	const char *	directory,
		const char *	base,
		std::string	language
	)

Definition at line 132 of file i18n.cpp.

{
  std::string filename, contents;
  const unsigned char *data;
  size_t datalen;
  size_t idx;
  unsigned char chunk_type;
  uint32_t chunk_size;
  uint32_t num_messages = (uint32_t)-1;
  uint32_t messages_idx = (uint32_t)-1;
  uint32_t offsets_idx = (uint32_t)-1;
  std::string translation, source, context;
 
  i18n_log("i18n_set_language(" << directory << "," << base << ")");
  if (!directory || !base)
    return -1;
 
  if (language.empty())
    language = i18n_get_language();
  filename = std::string(directory) + "/" + base + "_" + language + ".qm";
  i18n_log("Loading translations for language " << language);
 
  boost::system::error_code ignored_ec;
  if (boost::filesystem::exists(filename, ignored_ec)) {
    if (!epee::file_io_utils::load_file_to_string(filename, contents)) {
      i18n_log("Failed to load translations file: " << filename);
      return -1;
    }
  } else {
    i18n_log("Translations file not found: " << filename);
    filename = std::string(base) + "_" + language + ".qm";
    if (!find_embedded_file(filename, contents)) {
      i18n_log("Embedded translations file not found: " << filename);
      const char *underscore = strchr(language.c_str(), '_');
      if (underscore) {
        std::string fallback_language = std::string(language, 0, underscore - language.c_str());
        filename = std::string(directory) + "/" + base + "_" + fallback_language + ".qm";
        i18n_log("Loading translations for language " << fallback_language);
        if (boost::filesystem::exists(filename, ignored_ec)) {
          if (!epee::file_io_utils::load_file_to_string(filename, contents)) {
            i18n_log("Failed to load translations file: " << filename);
            return -1;
          }
        } else {
          i18n_log("Translations file not found: " << filename);
          filename = std::string(base) + "_" + fallback_language + ".qm";
          if (!find_embedded_file(filename, contents)) {
            i18n_log("Embedded translations file not found: " << filename);
            return -1;
          }
        }
      } else {
        return -1;
      }
    }
  }
 
  data = (const unsigned char*)contents.c_str();
  datalen = contents.size();
  idx = 0;
  i18n_log("Translations file size: " << datalen);
 
  /* Format of the QM file (AFAICT):
   *   16 bytes magic
   *   chunk list: N instances of chunks:
   *     1 byte: chunk type (0x42: offsets, 0x69: messages)
   *     4 bytes: chunk length, big endian
   *     D bytes: "chunk length" bytes of data
   *
   *   0x42 chunk: N instances of subchunks:
   *     1 byte: subchunk type
   *       0x01: end, no data
   *       0x02: unsupported
   *       0x03: translation
   *         4 bytes: string length, big endian
   *         N bytes: string data, UTF-16 (or UCS2-BE ?)
   *       0x04: unsupported
   *       0x05: obsolete, unsupported
   *       0x06: source text
   *       0x07: context
   *       0x08: obsolete, unsupported
   *       other: unsupported
   *     4 bytes: subchunk length, big endian - except for 0x01, which has none
   *     S bytes: "chunk length" bytes of data
   *   0x69 chunk:
   *     string data indexed by the 0x42 chunk data
   */
  if (datalen < sizeof(qm_magic) || memcmp(data, qm_magic, sizeof(qm_magic))) {
    i18n_log("Bad translations file format: " << filename);
    return -1;
  }
  idx += sizeof(qm_magic);
 
  while (idx < datalen) {
    if (idx + 5 > datalen) {
      i18n_log("Bad translations file format: " << filename);
      return -1;
    }
    chunk_type = data[idx++];
    chunk_size = be32(data+idx);
    idx += 4;
 
    i18n_log("Found " << chunk_type << " of " << chunk_size << " bytes");
    if (chunk_size >= datalen || idx > datalen - chunk_size) {
      i18n_log("Bad translations file format: " << filename);
      return -1;
    }
 
    switch (chunk_type) {
      case 0x42:
        i18n_log("Found offsets at " << idx);
        /* two 32 bit integers, and possible padding */
        offsets_idx = idx;
        num_messages = chunk_size / 8;
        break;
      case 0x69:
        i18n_log("Found messages at " << idx);
        messages_idx = idx;
        break;
      default:
        i18n_log("Found unsupported chunk type: " << chunk_type);
        break;
    }
 
    idx += chunk_size;
  }
 
  if (offsets_idx == (uint32_t)-1) {
    i18n_log("No offsets chunk found");
    return -1;
  }
  if (messages_idx == (uint32_t)-1) {
    i18n_log("No messages chunk found");
    return -1;
  }
 
  for (uint32_t m = 0; m < num_messages; ++m) {
    be32(data+offsets_idx+m*8); // unused
    idx = be32(data+offsets_idx+m*8+4);
    idx += messages_idx;
 
    if (idx > datalen || idx + 1 > datalen) {
      i18n_log("Bad translations file format: " << filename);
      return -1;
    }
 
    while (1) {
      if (idx + 5 > datalen) {
        i18n_log("Bad translations file format: " << filename);
        return -1;
      }
      chunk_type = data[idx++];
      chunk_size = 0;
      if (chunk_type == 0x01) {
        i18n_entries[context + std::string("",1) + source] = translation;
        context = std::string();
        source = std::string();
        translation = std::string();
        break;
      }
 
      chunk_size = be32(data+idx);
      idx += 4;
      i18n_log("Found " << chunk_type << " of " << chunk_size << " bytes");
      if (chunk_size >= datalen || idx > datalen - chunk_size) {
        i18n_log("Bad translations file format: " << filename);
        return -1;
      }
      switch (chunk_type) {
        case 0x03: // translation, UTF-16
          translation = utf16(data+idx, chunk_size);
          i18n_log("Found translation: " << translation);
          break;
        case 0x06: // source, UTF-8
          source = utf8(data+idx, chunk_size);
          i18n_log("Found source: " << source);
          break;
        case 0x07: // context, UTF-8
          context = utf8(data+idx, chunk_size);
          i18n_log("Found context: " << context);
          break;
      }
      idx += chunk_size;
    }
  }
 
  return 0;
}

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i18n_translate()

const char* i18n_translate	(	const char *	s,
		const std::string &	context
	)

Definition at line 322 of file i18n.cpp.

{
  const std::string key = context + std::string("", 1) + s;
  std::map<std::string,std::string>::const_iterator i = i18n_entries.find(key);
  if (i == i18n_entries.end())
    return s;
  return (*i).second.c_str();
}

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