Problem in String Decompressor

[yaha1982]

Good Morning Friends
I have a compress data with type byte[]. Whenever i tried to write compress data into buffer it goes into infinite loop in some case. For example in 1000 file 2 or 3 files goes into infinite loop. That means those byte[] can not reach at its end of file.

MY Java Code is :

public static byte[] deCompressDoc(b yte[] compressedData) {
//Create the decompressor and give it the data to compress
Inflater decompressor = new Inflater(true);
decompressor.se tInput(compress edData);

// Create an expandable byte array to hold the decompressed data
ByteArrayOutput Stream byteInputStream = new
ByteArrayOutput Stream(compress edData.length);

// Decompress the data
byte[] buf = new byte[1024];
while (!decompressor. finished()) {
try {
int count = decompressor.in flate(buf);
byteInputStream .write(buf, 0, count);
} catch (DataFormatExce ption e) {
throw new SDFException(" Error on Decompression of a
Document ", e);
}
}
try {
byteInputStream .close();
} catch (IOException e) {
throw new SDFException("E rror on Decompression of a
Document ", e);
}

// Get the decompressed data
byte[] decompressedDat a = byteInputStream .toByteArray();

return decompressedDat a;
}



The real problem is in some cases my while loop goes into infinite loop eventhoegh my byte[] is perfect.

Please give me a positive solution as early as possible.

Thanks

[Nepomuk]

Good Morning Friends
I have a compress data with type byte[]. Whenever i tried to write compress data into buffer it goes into infinite loop in some case. For example in 1000 file 2 or 3 files goes into infinite loop. That means those byte[] can not reach at its end of file.

MY Java Code is :
[CODE=java]
public static byte[] deCompressDoc(b yte[] compressedData) {
//Create the decompressor and give it the data to compress
Inflater decompressor = new Inflater(true);
decompressor.se tInput(compress edData);

// Create an expandable byte array to hold the decompressed data
ByteArrayOutput Stream byteInputStream = new
ByteArrayOutput Stream(compress edData.length);

// Decompress the data
byte[] buf = new byte[1024];
while (!decompressor. finished()) {
try {
int count = decompressor.in flate(buf);
byteInputStream .write(buf, 0, count);
} catch (DataFormatExce ption e) {
throw new SDFException(" Error on Decompression of a
Document ", e);
}
}
try {
byteInputStream .close();
} catch (IOException e) {
throw new SDFException("E rror on Decompression of a
Document ", e);
}

// Get the decompressed data
byte[] decompressedDat a = byteInputStream .toByteArray();

return decompressedDat a;
}
[/CODE]


The real problem is in some cases my while loop goes into infinite loop eventhoegh my byte[] is perfect.

Please give me a positive solution as early as possible.

Thanks

What does your decompressor.fi nished() method look like and where does it get it's information from? That could be, where it's going wrong.

Greetings,
Nepomuk

PS.: Please use CODE tags to post code.

[yaha1982]

What does your decompressor.fi nished() method look like and where does it get it's information from? That could be, where it's going wrong.

Greetings,
Nepomuk

PS.: Please use CODE tags to post code.

decompressor.fi nished() is mothod of java.util.zip.I nflater class and my while loop continues upto end of character of byte[].

[Nepomuk]

I don't know, why it gets stuck, but you can have a control, which ends the decompression after a certain time, if it hasn't finished. Of course, if a file is very big and takes a long time, you might not be able to unpack it.

If you want such a limitation, you can do it like this:
[CODE=java]
long time = System.currentT imeMillis();
while(!decompre ssor.finished() && System.currentT imeMillis() - time < 600000) // this will give the process 10 Minutes to finish
{
// ...
}
[/CODE]
Can't think of anything else now, but maybe someone else can?

Greetings,
Nepomuk

[JosAH]

Why don't you simply use an InflaterInputSt ream which reads from a ByteArrayInputS tream?
Of course you can write it to a ByteArrayOutput Stream again and retrieve the
byte array when all has been read, inflated and written again.

kind regards,

Jos

[yaha1982]

I don't know, why it gets stuck, but you can have a control, which ends the decompression after a certain time, if it hasn't finished. Of course, if a file is very big and takes a long time, you might not be able to unpack it.

If you want such a limitation, you can do it like this:
[CODE=java]
long time = System.currentT imeMillis();
while(!decompre ssor.finished() && System.currentT imeMillis() - time < 600000) // this will give the process 10 Minutes to finish
{
// ...
}
[/CODE]
Can't think of anything else now, but maybe someone else can?

Greetings,
Nepomuk

Thanks for replying me , now it is working properly for small files but not for big one
Thanks again

[Nepomuk]

Thanks for replying me , now it is working properly for small files but not for big one
Thanks again

What goes wrong? Does it give you an error? Does it just not complete the job, because it stops after 10 Minutes? Or is it something totally different?

Greetings,
Nepomuk

[JosAH]

*cough* reply #5.

kind regards,

Jos