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boinc/lib/translate.cpp

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///////////////////////////////////////////////////////////////////////////////
// Original Name: src/common/intl.cpp
// Original Purpose: Internationalization and localisation for wxWidgets
// Original Author: Vadim Zeitlin
// Modified by: Charlie Fenton for BOINC 13 June, 2013
// Created: 29/01/98
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
//
// This file is part of BOINC.
// http://boinc.berkeley.edu
//
// Simplified string localization code for use in BOINC adapted from
// wxWidgets src/common/intl.cpp.
//
// For sample code to get preferred system language, see
// wxLocale::GetSystemLanguage() in wxWidgets src/common/intl.cpp
//
// Those portions of this code which are taken from wxWidgets are
// Copyright: (c) 1998 Vadim Zeitlin
// and are covered by the wxWidgets license which can be found here:
// <http://www.wxwidgets.org/about/licence3.txt>
//
// This code assumes all catalogs are encoded UTF-8
// (Note: wxstd.mo files are encoded ISO 8859-1 not UTF-8.)
//
// We recommended that you first call BOINCTranslationAddCatalog()
// for the user's preferred language, then for the user's second
// preferred language and (optionally) then for the user's third
// preferred language. This will make it more likley that a
// translation will be found in some language useful to the user.
//
#include <stdint.h>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <sys/param.h> // for MAXPATHLEN
#include <sys/stat.h> // For stat()
#include "translate.h"
static const uint32_t MSGCATALOG_MAGIC = 0x950412de;
static const uint32_t MSGCATALOG_MAGIC_SW = 0xde120495;
#define MAXCATALOGS 20
// an entry in the string table
struct MsgTableEntry {
uint32_t nLen; // length of the string
uint32_t ofsString; // pointer to the string
};
// header of a .mo file
struct MsgCatalogHeader {
uint32_t magic, // offset +00: magic id
revision, // +04: revision
numStrings; // +08: number of strings in the file
uint32_t ofsOrigTable, // +0C: start of original string table
ofsTransTable; // +10: start of translated string table
uint32_t nHashSize, // +14: hash table size
ofsHashTable; // +18: offset of hash table start
};
struct MsgCatalogData {
uint8_t *pData; // Pointer to catalog data
uint32_t nSize; // Amount of memory pointed to by pData.
uint32_t NumStrings; // number of strings in this domain
bool bSwapped; // wrong endianness?
MsgTableEntry *pOrigTable; // pointer to original strings
MsgTableEntry *pTransTable; // pointer to translated strings
bool bIsEnglish; // true if language code == "en"
};
static struct MsgCatalogData theCatalogData[MAXCATALOGS];
static uint32_t numLoadedCatalogs = 0;
// swap the 2 halves of 32 bit integer if needed
static uint32_t Swap(uint32_t ui, bool bSwapped) {
return bSwapped ? (ui << 24) | ((ui & 0xff00) << 8) |
((ui >> 8) & 0xff00) | (ui >> 24)
: ui;
}
// load a catalog from disk
// open disk file and read in it's contents
//
// catalogsDir is the path to the locale directory in
// the BOINC Data directory (ending in "locale/").
//
// language code is the standad language code such
// as "fr" or "zh_CN".
//
// catalogName is the domain (the file name of the
// *.mo file without the .mo such as "BOINC-Manager").
//
// Returns true if successful.
//
static bool LoadCatalog(const char * catalogsDir,
const char *languageCode,
const char *catalogName
) {
char searchPath[MAXPATHLEN];
struct stat sbuf;
char temp[32];
char *underscore;
FILE * f;
uint8_t *pData;
uint32_t nSize;
uint32_t NumStrings;
bool bSwapped;
MsgTableEntry *pOrigTable;
MsgTableEntry *pTransTable;
MsgCatalogData *pCatalog;
if (!strcmp("en", languageCode)) {
theCatalogData[numLoadedCatalogs++].bIsEnglish = true;
return true;
}
strlcpy(searchPath, catalogsDir, sizeof(searchPath));
strlcat(searchPath, languageCode, sizeof(searchPath));
strlcat(searchPath, "/", sizeof(searchPath));
strlcat(searchPath, catalogName, sizeof(searchPath));
strlcat(searchPath, ".mo", sizeof(searchPath));
if (stat(searchPath, &sbuf) != 0) {
// Try just base locale name: for things like "fr_BE" (belgium
// french) we should use "fr" if no belgium specific message
// catalogs exist
strlcpy(temp, languageCode, sizeof(temp));
underscore = strchr(temp, (int)'_');
if (underscore == NULL) return false;
*underscore = '\0';
strlcpy(searchPath, catalogsDir, sizeof(searchPath));
strlcat(searchPath, temp, sizeof(searchPath));
strlcat(searchPath, "/", sizeof(searchPath));
strlcat(searchPath, catalogName, sizeof(searchPath));
strlcat(searchPath, ".mo", sizeof(searchPath));
if (stat(searchPath, &sbuf) != 0) return false;
}
pData = (uint8_t*)malloc(sbuf.st_size);
if (pData == NULL) return false;
f = fopen(searchPath, "r");
if (f == NULL) {
free(pData);
pData = NULL;
return false;
}
nSize = fread(pData, 1, sbuf.st_size, f);
fclose(f);
if (nSize != sbuf.st_size) {
free(pData);
pData = NULL;
return false;
}
// examine header
bool bValid = nSize + (size_t)0 > sizeof(MsgCatalogHeader);
MsgCatalogHeader *pHeader = (MsgCatalogHeader *)pData;
if ( bValid ) {
// we'll have to swap all the integers if it's true
bSwapped = pHeader->magic == MSGCATALOG_MAGIC_SW;
// check the magic number
bValid = bSwapped || pHeader->magic == MSGCATALOG_MAGIC;
}
if ( !bValid ) {
// it's either too short or has incorrect magic number
free(pData);
pData = NULL;
return false;
}
// initialize
NumStrings = Swap(pHeader->numStrings, bSwapped);
if (NumStrings <= 1) {
// This file has no translations (is effectively
// empty) so don't load it for better efficiency.
fprintf(stderr, "File %s contains no translated strings!\n", searchPath);
free(pData);
pData = NULL;
return true; // Not an error
}
pOrigTable = (MsgTableEntry *)(pData +
Swap(pHeader->ofsOrigTable, bSwapped));
pTransTable = (MsgTableEntry *)(pData +
Swap(pHeader->ofsTransTable, bSwapped));
// now parse catalog's header and try to extract catalog charset
uint32_t ofsString = Swap(pOrigTable->ofsString, bSwapped);
// this check could fail for a corrupt message catalog
if ( ofsString + Swap(pOrigTable->nLen, bSwapped) <= nSize) {
char *begin = strstr((char *)(pData + Swap(pTransTable->ofsString, bSwapped)),
"Content-Type: text/plain; charset="
);
if (begin != NULL) {
begin += 34; //strlen("Content-Type: text/plain; charset=")
if (strncasecmp(begin, "utf-8", 5)) {
fprintf(stderr, "File %s is not utf-8!\n", searchPath);
free(pData);
pData = NULL;
return false;
}
}
}
pCatalog = &(theCatalogData[numLoadedCatalogs++]);
pCatalog->pData = pData;
pCatalog->nSize = nSize;
pCatalog->NumStrings = NumStrings;
pCatalog->bSwapped = bSwapped;
pCatalog->pOrigTable = pOrigTable;
pCatalog->pTransTable = pTransTable;
pCatalog->bIsEnglish = false;
return true;
}
// Searches through the catalogs in the order they were added
// until it finds a translation for the src string, and
// returns a ponter to the UTF-8 encoded localized string.
// Returns a pointer to the original string if no translation
// was found.
//
uint8_t * _(char *src) {
unsigned int i, j;
MsgCatalogData *pCatalog;
for (j=0; j<numLoadedCatalogs; ++j) {
pCatalog = &(theCatalogData[j]);
// Since the original strings are English, no
// translation is needed for language en.
if (pCatalog->bIsEnglish) {
return (uint8_t *)src;
}
if (pCatalog->pData == NULL) continue; // Should never happen
for (i=0; i<pCatalog->NumStrings; ++i) {
if (!strcmp((char *)pCatalog->pData + pCatalog->pOrigTable[i].ofsString, src)) {
return (pCatalog->pData + pCatalog->pTransTable[i].ofsString);
}
}
}
return (uint8_t *)src;
}
// catalogsDir is the path to the locale directory in
// the BOINC Data directory (ending in "locale/").
//
// language code is the standad language code such
// as "fr" or "zh_CN".
//
// catalogName is the domain (the file name of the
// *.mo file without the .mo such as "BOINC-Manager").
//
// Returns true if successful.
//
bool BOINCTranslationAddCatalog(const char * catalogsDir,
const char *languageCode,
const char * catalogName
) {
if (numLoadedCatalogs >= (MAXCATALOGS)) {
fprintf(stderr, "Trying to load too many catalogs\n");
return false;
}
if (!LoadCatalog(catalogsDir, languageCode, catalogName)) {
fprintf(stderr,
"could not load catalog %s for langage %s\n",
catalogName, languageCode
);
return false;
}
return true;
}
void BOINCTranslationInit() {
int i;
MsgCatalogData *pCatalog;
numLoadedCatalogs = 0;
for (i=0; i<MAXCATALOGS; ++i) {
pCatalog = &(theCatalogData[i]);
pCatalog->pData = NULL;
pCatalog->nSize = 0;
pCatalog->NumStrings = 0;
pCatalog->bSwapped = false;
pCatalog->pOrigTable = NULL;
pCatalog->pTransTable = NULL;
pCatalog->bIsEnglish = false;
}
}
void BOINCTranslationCleanup() {
int i;
MsgCatalogData *pCatalog;
for (i=0; i<MAXCATALOGS; ++i) {
pCatalog = &(theCatalogData[i]);
if (pCatalog->pData) free(pCatalog->pData);
pCatalog->pData = NULL;
pCatalog->nSize = 0;
pCatalog->NumStrings = 0;
pCatalog->bSwapped = false;
pCatalog->pOrigTable = NULL;
pCatalog->pTransTable = NULL;
pCatalog->bIsEnglish = false;
}
numLoadedCatalogs = 0;
}
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