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MoParser.cpp
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MoParser.cpp
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/*
Copyright (C) 2010 Laurent Cozic. All right reserved.
Use of this source code is governed by a GNU/GPL license that can be
found in the LICENSE file.
*/
#pragma warning(disable: 4345) // warning C4345: behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized
#pragma warning(disable: 4996) // warning C4996: 'std::basic_string<_Elem,_Traits,_Ax>::copy': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators'
#include <ctype.h>
#include <fstream>
#include <sys/stat.h>
#include "MoParser.h"
using namespace std;
const int32_t GettextMoParser::HEADER_MAGIC_NUMBER = 0x950412de;
const int32_t GettextMoParser::HEADER_MAGIC_NUMBER_SW = 0xde120495;
GettextMoParser::GettextMoParser() {
swappedBytes_ = false;
moFileHeader_ = NULL;
moData_ = NULL;
charset_ = NULL;
charsetParsed_ = false;
ready_ = false;
}
int32_t GettextMoParser::swap_(int32_t ui) const {
return swappedBytes_ ? (ui << 24) | ((ui & 0xff00) << 8) |
((ui >> 8) & 0xff00) | (ui >> 24)
: ui;
}
void GettextMoParser::clearData() {
if (moData_) delete moData_;
if (charset_) delete charset_;
swappedBytes_ = false;
moFileHeader_ = NULL;
moData_ = NULL;
charset_ = NULL;
charsetParsed_ = false;
for (int i = 0; i < (int)messages_.size(); i++) {
TranslatedMessage* message = messages_.at(i);
if (message->original) {
delete[] message->original->string;
delete message->original;
}
if (message->translated) {
delete[] message->translated->string;
delete message->translated;
}
delete message;
}
messages_.clear();
ready_ = false;
}
bool GettextMoParser::parseFile(const char* filePath) {
clearData();
struct stat fileInfo;
if (stat(filePath, &fileInfo) != 0) {
// Cannot get file size
clearData();
return false;
}
char* moData = new char[fileInfo.st_size];
ifstream moFile(filePath, ios::in | ios::binary);
if (!moFile.read(moData, fileInfo.st_size)) {
// Cannot read file data
clearData();
return false;
}
return parse(moData);
}
bool GettextMoParser::parse(char* moData) {
moData_ = moData;
moFileHeader_ = (MoFileHeader*)moData_;
if (moFileHeader_->magic != HEADER_MAGIC_NUMBER && moFileHeader_->magic != HEADER_MAGIC_NUMBER_SW) {
// Invalid header
clearData();
return false;
}
// If the magic number bytes are swapped, all the other numbers will have
// to be swapped
swappedBytes_ = moFileHeader_->magic == HEADER_MAGIC_NUMBER_SW;
moFileHeader_->magic = swap_(moFileHeader_->magic);
moFileHeader_->revision = swap_(moFileHeader_->revision);
moFileHeader_->numStrings = swap_(moFileHeader_->numStrings);
moFileHeader_->offsetOriginalStrings = swap_(moFileHeader_->offsetOriginalStrings);
moFileHeader_->offsetTranslatedStrings = swap_(moFileHeader_->offsetTranslatedStrings);
moFileHeader_->hashTableSize = swap_(moFileHeader_->hashTableSize);
moFileHeader_->offsetHashTable = swap_(moFileHeader_->offsetHashTable);
ready_ = true;
return true;
}
GettextMoParser::~GettextMoParser() {
clearData();
}
char* GettextMoParser::charset() const {
if (charset_ || charsetParsed_) return charset_;
if (!moData_) return NULL;
charsetParsed_ = true;
MoOffsetTableItem* translationTable = (MoOffsetTableItem*)(moData_ + moFileHeader_->offsetTranslatedStrings);
translationTable->length = swap_(translationTable->length);
translationTable->offset = swap_(translationTable->offset);
char* infoBuffer = (char*)(moData_ + translationTable->offset);
std::string info(infoBuffer);
size_t contentTypePos = info.find("Content-Type: text/plain; charset=");
if (contentTypePos == info.npos) return NULL;
size_t stringStart = contentTypePos + 34; // strlen("Content-Type: text/plain; charset=")
size_t stringEnd = info.find('\n', stringStart);
if (stringEnd == info.npos) return NULL;
int charsetLength = stringEnd - stringStart;
if (charsetLength == 0) return NULL;
charset_ = new char[charsetLength + 1];
info.copy(charset_, charsetLength, stringStart);
charset_[charsetLength] = '\0';
if (strcmp(charset_, "CHARSET") == 0) {
delete[] charset_;
charset_ = NULL;
}
// To lowercase
for(int i = 0; i < (int)strlen(charset_); ++i) charset_[i] = tolower(charset_[i]);
return charset_;
}
GettextMessage* GettextMoParser::getTranslation(const char* originalString, int originalLength) {
if (originalLength <= 0) return NULL;
// Check if the string has already been looked up, in which case it is in the messages_
// vector. If found, return it and exit now.
for (int i = 0; i < (int)messages_.size(); i++) {
TranslatedMessage* message = messages_.at(i);
if (strcmp(originalString, message->original->string) == 0) {
return message->translated;
}
}
// Look for the original message
MoOffsetTableItem* originalTable = (MoOffsetTableItem*)(moData_ + moFileHeader_->offsetOriginalStrings);
originalTable->length = swap_(originalTable->length);
originalTable->offset = swap_(originalTable->offset);
int stringIndex;
bool found = false;
for (stringIndex = 0; stringIndex < moFileHeader_->numStrings; stringIndex++) {
char* currentString = (char*)(moData_ + originalTable->offset);
if (strcmp(currentString, originalString) == 0) {
found = true;
break;
}
originalTable++;
originalTable->length = swap_(originalTable->length);
originalTable->offset = swap_(originalTable->offset);
}
TranslatedMessage* message = new TranslatedMessage();
char* originalStringCopy = new char[originalLength + 1];
strcpy(originalStringCopy, originalString);
originalStringCopy[originalLength] = '\0';
GettextMessage* mOriginal = new GettextMessage();
mOriginal->length = originalTable->length;
mOriginal->string = originalStringCopy;
message->original = mOriginal;
if (!found) {
// Couldn't find orignal string
messages_.push_back(message);
message->translated = NULL;
return NULL;
}
// At this point, stringIndex is the index of the message and originalTable points to
// the original message data.
// Get the translated string and build and the output message structure
MoOffsetTableItem* translationTable = (MoOffsetTableItem*)(moData_ + moFileHeader_->offsetTranslatedStrings);
translationTable += stringIndex;
translationTable->length = swap_(translationTable->length);
translationTable->offset = swap_(translationTable->offset);
char* translatedString = new char[translationTable->length + 1];
char* tempString = (char*)(moData_ + translationTable->offset);
strncpy(translatedString, tempString, translationTable->length);
translatedString[translationTable->length] = '\0';
GettextMessage* mTranslated = new GettextMessage();
mTranslated->length = translationTable->length;
mTranslated->string = translatedString;
message->translated = mTranslated;
messages_.push_back(message);
return message->translated;
}