/**
* reads the content of a group of existing files in a zipped block
*
* @param domain The namespace used to identify the application domain (1st level directory) to
* use
* @param paths The paths relative to the domain for the files to be read
* @param offset The offset in the file to start reading from
* @param len The length of the block in bytes in zipped form
* @return The contents of the file in zipped form together with the description of the files
*/
public MultiFileBlock readFromStreamZipped(String[] paths, long offset, int len) {
MultiFileBlock block = null;
try {
if (_isLocal) {
int startFileIndex =
Util.getStartFileIndex(
_rootFile.getCanonicalPath() + File.separatorChar, paths, offset);
long startFileOffset =
Util.getStartFileOffset(
_rootFile.getCanonicalPath() + File.separatorChar, paths, offset);
int i = startFileIndex;
long j = startFileOffset;
// int bufSize=0;
int totalBufSize = 0;
int readResult = 0;
ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
GZIPOutputStream zOut = new GZIPOutputStream(bOut, len);
block = new MultiFileBlock();
while (totalBufSize < len && i < paths.length) {
File tmpFile = new File(_rootFile.getCanonicalPath() + File.separatorChar + paths[i]);
if (tmpFile.isFile() && tmpFile.exists()) {
RandomAccessFile in = new RandomAccessFile(tmpFile, "r");
byte[] tmpBuf = new byte[len - totalBufSize];
in.seek(j);
while (totalBufSize < len && in.getFilePointer() < in.length()) {
readResult = in.read(tmpBuf);
if (readResult != -1) {
zOut.write(tmpBuf, 0, readResult);
// bufSize = bOut.size();
totalBufSize += readResult;
} else {
break;
}
}
BlockFileDescriptor des = new BlockFileDescriptor(_domain, paths[i], in.length());
block.addBlockFileDescriptor(des);
in.close();
i++;
j = 0;
} else {
return null;
}
}
zOut.close();
block.setBlockData(bOut.toByteArray());
} else {
block = _remote.readFromStreamZipped(_domain, paths, offset, len);
}
} catch (Exception ex) {
ex.printStackTrace();
}
return block;
}
