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bool compresserFichier(String ^cheminSource, String ^cheminDestination)
{
try
{
// The file is placed in the FileStream
FileStream ^ monFileStream = gcnew FileStream(cheminSource, FileMode::Open);
cli::array<unsigned char,1> ^ monBuffer = gcnew cli::array<unsigned char>(safe_cast<int>(monFileStream->Length));
// reading the FileStream
monFileStream->Read(monBuffer, 0, safe_cast<int>(monFileStream->Length));
// closing the FileStream
monFileStream->Close();
// Create the file which will contain the compressed file
monFileStream = gcnew FileStream(cheminDestination, FileMode::Create);
// Data compression
GZipStream ^monGZipStream = gcnew GZipStream(monFileStream, CompressionMode::Compress, false);
// writing compressed data into the destination file
monGZipStream->Write(monBuffer, 0, monBuffer->Length);
// Closing the GZipStream
monGZipStream->Close();
return true;
}
catch(Exception ^e)
{
Console::WriteLine(e->Message);
return false;
}
}
bool decompression(String ^cheminSource, String ^ cheminDestination)
{
/*cheminSource : complete name of the compressed file
cheminDestination : place where the file will be decompressed*/
try
{
// reading the compressed file
FileStream ^monFileStream = gcnew FileStream(cheminSource, FileMode::Open);
// File data placed into GZipStream
GZipStream ^monGzipStream = gcnew GZipStream(monFileStream, CompressionMode::Decompress);
// Array that will contain the size of the file
array <unsigned char> ^tailleOctets = gcnew array<unsigned char>(4);
// get the position in the stream to get the size
int position = safe_cast<int>(monFileStream->Length) - 4;
monFileStream->Position = position;
// get the file size
monFileStream->Read(tailleOctets, 0, 4);
// position into beginning of the stream
monFileStream->Position = 0;
// Converting the file size into int
int tailleFichier = BitConverter::ToInt32(tailleOctets, 0);
// new size for the buffer
array<unsigned char> ^buffer = gcnew array<unsigned char>(tailleFichier + 100);
// Offset which permit to know its position inside the stream
int monOffset = 0;
while (true)
{
// Data are decompressed and put in the buffer
int decompressionOctets = monGzipStream->Read(buffer, monOffset, 100);
// continue until we get all the data
if (!decompressionOctets)
break;
// incrementing the offset so we won't begin from 0 each time...
monOffset += decompressionOctets;
}
// creating the decompressed file
monFileStream = gcnew FileStream(cheminDestination, FileMode::Create);
// Writing decompressed data on the file
monFileStream->Write(buffer, 0, tailleFichier - 1);
// clear data from tampon memory
monFileStream->Flush();
// Closing streams
monFileStream->Close();
monGzipStream->Close();
return true;
}
catch(Exception ^e)
{
Console::WriteLine(e->Message);
return false;
}
} |
HELP ! probleme dans une fct pour compression
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