CODEWITHSUNDEEP
javaarraysbyteprimitivezip
ShaneK
ShaneK

Reputation: 303

Java zipfile/byte array issue

I have a zip file with 3 relatively large (several mb) binary files I need to read into a buffer to perform some regex operations on. 

//For entry in zip.getentries loop above

long size = entry.getSize();

byte[] bytes = new byte[(int) size];

int numBytesRead = zipFile.getInputStream(entry).read(bytes);

if (numBytesRead != size) {
     Logger.getLogger(this.getClass()).debug(
                "Read " + numBytesRead + " bytes from zip entry but size of the  
                zip entry is " + size + " bytes");
//continue; - If I do not comment this out the size check fails and nothing happens
}

FileUtils.writeByteArrayToFile(extractFile, bytes);

For some reason I am only getting about 1/15 of the data or so into the byte array (43 out of 642 records in one example). I originally thought it was an issue perhaps casting size to int, but size is typically between 1,000,000 - 10,000,000 or so so that isn't a problem. Any thoughts?

Upvotes: 1

Views: 248

Answers (2)

ShaneK
ShaneK

Reputation: 303

I ended up using IOUtils to solve the problem. Thanks for the pointers Flavio, Duncan

Upvotes: 0

Flavio
Flavio

Reputation: 11977

InputStream.read is not required to read all the data. It will read some data, with an amount varying between 1 and the size of the array.

You will have to call the function repeatedly until you read all the data you need.

For reference, check the API docs: they explicitly say "a smaller number may be read".

Upvotes: 3

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