IndexOf - difference between Win and Linux encoding
Hello folks, wondering if someone could put me on the right track over this little problem with porting a java app to Linux...
I have a nice little program, developed on (the latest) JDK under windows which reads a custom file format, locates the second occurance of the substring 'PNG', ignores everything before the character before this PNG (hence the -1 below) and saves the remainder, which is now a bog-standard PNG image. The first 'PNG substring always occurs within the first 50 bytes (hence the 50 below) and the second around the 2kB mark. Here's the line that finds the location of the second 'PNG' in the file loaded into strFileContent:
location = strFileContent.indexOf( "PNG", 50 )-1;All is well compiled and run on windows, say file 'test1.xyz' produces a value for location of 2076 and saves a nice PNG called 'test1.png'.
When I haul it over to Linux (Ubuntu 9.04) and lo, location comes out as 1964 for the same file, and of course the file is no-longer a PNG because there are an extra 112 bytes on the front end. Running the windows compile of the code or a fresh Linux compile makes no difference.
I'm suspecting Win and Linux Java count, perhaps, line endings or some such differently, perhaps have to check an encoding. I'd appreciate any pointers on correcting this to work on both platforms (ultimately I'm trying to appease a Mac user, but don't have a Mac to play with at the moment).
Cheers,
K.
Ken
phaethon2008 wrote:
I'm suspecting Win and Linux Java count, perhaps, line endings or some such differently, perhaps have to check an encoding. I'd appreciate any pointers on correcting this to work on both platforms (ultimately I'm trying to appease a Mac user, but don't have a Mac to play with at the moment).The immediate cause of your problem is probably that Windows uses a 8bit encoding as the default (probably some ISO-8859-{noformat}*{noformat} variant or the Windows-bastardization of it), while Ubuntu uses UTF-8, which has a varying number of bytes per character.
The much more important underlying problem is that you're trying to treat binary data as if it were text. A PNG image is not text. Handling binary data in Strings (or char[]) is a sure way to invite desaster.
You must convert your code to handle InputStream/OutputStream/byte[] instead of Reader/Writer/String/char[].
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oracle-validated (Oracle Linux 5)
oracle-rdbms-server-11gR2-preinstall (Oracle Linux 6)
And last not least you have just one vendor and support requirement for Oracle products.
Have you checked the Internet:
http://www.oracle.com/us/technologies/linux/index.html
https://linux.oracle.com
To obtain Oracle Linux:
https://edelivery.oracle.com/linux
https://wikis.oracle.com/display/oraclelinux/Downloading+Oracle+Linux (alternative)
Edited by: Dude on Aug 8, 2012 2:29 PM
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