FTPClient ftpClient;
ZipOutputStream zipOut = null;
zipOut = new ZipOutputStream(ftpClient.storeFileStream("a.zip"));
String str;
byte []conarr=str.getBytes();
zipOut.putNextEntry(new ZipEntry("1.txt"));
zipOut.write(conarr);
zipOut.close();
If str only has several characters, it's ok,
but if str is dozens of kB, the zip file has an error.
Related
I have some trouble with decompress gzip from string in lua. (mb bad understanding)
Response of one web-services is base64-encoded gzip string, for sample I get some code on C#.
public static string Decompress(byte[] value, Encoding Encoding = null)
{
if (value == null) return null;
Encoding = Encoding ?? System.Text.Encoding.Unicode;
using (var inputStream = new MemoryStream(value))
using (var outputStream = new MemoryStream())
{
using (var zip = new GZipStream(inputStream, CompressionMode.Decompress))
{
byte[] bytes = new byte[4096];
int n;
while ((n = zip.Read(bytes, 0, bytes.Length)) != 0)
{
outputStream.Write(bytes, 0, n);
}
zip.Close();
}
return Encoding.GetString(outputStream.ToArray());
}
}
static void Main(string[] args)
{
const string encodedText = "H4sIAAAAAAAEAHMNCvIPUlRwzS0oqVQoLinKzEtXyC9SyCvNyYFxM/OAqKC0RKEgsSgxN7UktQgAwOaxgjUAAAA=";
byte[] decodedBytes = Convert.FromBase64String(encodedText);
var decodedString = Decompress(decodedBytes, Encoding.UTF8);
Console.WriteLine(decodedString);
}
I try to do this with lua (on nginx) and make from base64 string array of byte
local byte_table={};
base64.base64_decode(res_string):gsub(".", function(c){
table.insert(byte_table, string.byte(c))
})
but have some problem with zlib.
Please help me understanding how can I use IO stream in lua and decompress gzip.
I try to do this with lua (on nginx) and make from base64 string array of byte
No, you are making Lua table with bunch of numbers.
Decode base64 and feed to zlib the whole resulting string.
I'm use http://luaforge.net/projects/lzlib/ for gzip decompressing:
local result = zlib.decompress(str,31)
I am getting this error when converting inputStream into ObjectInputStream.
Please help me regarding this.
My Code:
InputStream isSchema = Thread.currentThread()
.getContextClassLoader().getResourceAsStream("schema.xsd");
ObjectInputStream inputStream = new ObjectInputStream(isSchema);
Exception:
java.io.StreamCorruptedException: invalid stream header: 3C787364
3C787364 in hexadecimal is <xsd .
schema.xsd is not a file of serialized objects previously written using an ObjectOutputStream. You must use InputStreamReader.
Just an example
InputStream inputStream = new FileInputStream("c:\\data\\input.txt");
Reader reader = new InputStreamReader(inputStream);
int data = reader.read();
while(data != -1){
char theChar = (char) data;
data = reader.read();
}
reader.close();
Text I am reading from a XML, which is suppose to be a string with base64 encoded and Gzip compressed. I am following the below steps:
string text = childNodes.Item(i).InnerText.Trim();
byte[] compressed = Convert.FromBase64String(text);
byte[] compressed = Convert.FromBase64String(text);
using (var uncompressed = new MemoryStream())
using (var inStream = new MemoryStream(compressed))
using (var outStream = new GZipStream(inStream, CompressionMode.Decompress))
{
outStream.CopyTo(uncompressed);
var reader = new StreamReader(uncompressed);
uncompressed.Position = 0;
string myStr = reader.ReadToEnd();
Console.WriteLine(myStr);
}
I am getting myStr value as something like :
�\b\0\0\0\0\0\0Ľk��ƒ �Y��ؘX{���z:�n�,ɏ�ek��xϞ�`�\0؍�|\t ��_3�\n(\0$�s.Cb�\0*3++��|
͛ �-7�6�fW\r\t�\b���W\"�\n�ə��L&���Ez�-����E��\t�%���/���O��Q����
i�����]�T�b�<_�dŦ�W۫���ܭn^[X�ϕ��{�"
I am expecting adecoded string. Any hint on this is much appreciated.
Thanks in Advance. :)
i am having an issue when trying to read saved List from binary file back to a List.
the file is encrypted, without encryption i had no problem.
writing method:
private void WriteEncodedFile(FileStream fileStream, MemoryStream memoryStream)
{
StreamReader sr = new StreamReader(memoryStream);
BinaryWriter bw = new BinaryWriter(fileStream);
memoryStream.Seek(0, SeekOrigin.Begin);
string data = sr.ReadToEnd();
var bytes = Encoding.UTF8.GetBytes(data);
for (int i = 0; i < bytes.Length; i++) bytes[i] ^= 0x5a;
bw.Write(Convert.ToBase64String(bytes));
bw.Close();
fileStream.Close();
}
Reading method:
private void ReadEncodedFile(FileStream fileStream, MemoryStream memoryStream)
{
BinaryReader br = new BinaryReader(fileStream);
StreamWriter sw = new StreamWriter(memoryStream);
fileStream.Seek(0, SeekOrigin.Begin);
memoryStream.Seek(0, SeekOrigin.Begin);
string base64 = br.ReadString();
byte[] bytes = Convert.FromBase64String(base64);
for (int i = 0; i < bytes.Length; i++) bytes[i] ^= 0x5a;
string decodedData = Encoding.UTF8.GetString(bytes);
sw.Write(decodedData);
}
when reading the content i can see it in the "decodedData".
however the StreamWriter seems not to write it into the MemoryStream.
any idea?
thanks.
I think you are simply not flushing/closing the stream before checking.
sw.Flush();
or
sw.Close();
if done
and
fileStream.Close(); for good practice too
Edit:
Considering the comment, you need to seek to start of memory stream again before deserialising
i.e. memoryStream.Seek(0, SeekOrigin.Begin); where-ever you do it
I am trying to zip a 30Mb excel file.
Wrapping th fileinputstream and fileoutputstream reduced some of the memory consumption.
Please suggest if you have a better option than this approach.
Do you think, flushing the ZipOutputStream after zos.write() inside while loop will be of any advantage?
Following is the code which i use.
public void zipBigFile()
throws IOException, ParseException {
String outFileName= "D:/Out/Big.zip";
File file = new File(outFileName);
FileOutputStream out = new FileOutputStream(file);
ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(out));
byte[] buffer = new byte[1024 * 8];
String inFileName = "D:/In/Big_File.xlsx";
FileInputStream fis = new FileInputStream(inFileName);
BufferedInputStream bis = new BufferedInputStream(fis);
ZipEntry zipEntry = new ZipEntry("Big_File_Zipped.xlsx");
zos.putNextEntry(zipEntry);
int length;
while ((length = bis.read(buffer)) > 0) {
zos.write(buffer, 0, length);
}
zos.closeEntry();
fis.close();
fis = null;
buffer = null;
zos.flush();
zos.close();
out.close();
out = null;
zos = null;
}