reading a blob and write it into a file

[guykes]

I 've putted a file into a blob by using dbms_lob.loadfromfile. The file was gzipped in unix.The lenght of the blob (using dbms_lob.getlength) is the same as the file on the filesystem.So far so good.Now when I want to read back the blob and put it in a file using utl_file, i see the the reproduced file is bigger when I compare it with the original file. So this means when I want the gunzip,gunzip gives error. Now I have red that utl_file adds chars when it puts it in a file, is there an other way to get the blob back in a file without differences to the original? Thankx