java - File getting truncated while conversion -

when converting folder many files ansi(windows-1252) utf8, of files getting truncated while file small size blank. tried converting files reducing buffer size, didn't succeed. 1 has any idea on this???

public class convertfromansitoutf8 {  private static final char byte_order_mark = '\ufeff'; private static final string ansi_code = "windows-1252"; private static final string utf_code = "utf8"; private static final charset ansi_charset = charset.forname(ansi_code);  public static void main(string[] args) {  list<file> filelist; file inputfolder = new file(args[0]); if (!inputfolder.isdirectory()) {     return; } file parentdir = new file(inputfolder.getparent() + "\\"                 + inputfolder.getname() + "_converted");  if (parentdir.exists()) {     return; } if (parentdir.mkdir()) {  } else {     return; }  filelist = new arraylist<file>(); (final file fileentry : inputfolder.listfiles()) {     filelist.add(fileentry); }  inputstream in; reader reader = null; writer writer = null; try {     (file file : filelist) {         in = new fileinputstream(file.getabsolutefile());         reader = new inputstreamreader(in, ansi_charset);          outputstream out = new fileoutputstream(                         parentdir.getabsolutefile() + "\\"                                         + file.getname());         writer = new outputstreamwriter(out, utf_code);         writer.write(byte_order_mark);         char[] buffer = new char[10];         int read;         while ((read = reader.read(buffer)) != -1) {             system.out.println(read);             writer.write(buffer, 0, read);         }     }     reader.close();     writer.close(); } catch (filenotfoundexception e) {     e.printstacktrace(); } catch (unsupportedencodingexception e) {     e.printstacktrace(); } catch (ioexception e) {     e.printstacktrace(); } } } 

any pointer helpful.

thanks, ashish