private void validate() throws IOException {
long compressedSize = inCounted.getSize();
// Validate Compressed Size and Uncompressed Size if they were
// present in Block Header.
if ((compressedSizeInHeader != -1 && compressedSizeInHeader != compressedSize)
|| (uncompressedSizeInHeader != -1 && uncompressedSizeInHeader != uncompressedSize))
throw new CorruptedInputException();
// Block Padding bytes must be zeros.
while ((compressedSize++ & 3) != 0)
if (inData.readUnsignedByte() != 0x00) throw new CorruptedInputException();
// Validate the integrity check.
byte[] storedCheck = new byte[check.getSize()];
inData.readFully(storedCheck);
if (!Arrays.equals(check.finish(), storedCheck))
throw new CorruptedInputException("Integrity check (" + check.getName() + ") does not match");
}
@Override
public int read(byte[] buf, int off, int len) throws IOException {
if (endReached) return -1;
int ret = filterChain.read(buf, off, len);
if (ret > 0) {
check.update(buf, off, ret);
uncompressedSize += ret;
// Catch invalid values.
long compressedSize = inCounted.getSize();
if (compressedSize < 0
|| compressedSize > compressedSizeLimit
|| uncompressedSize < 0
|| (uncompressedSizeInHeader != -1 && uncompressedSize > uncompressedSizeInHeader))
throw new CorruptedInputException();
// Check the Block integrity as soon as possible:
// - The filter chain shouldn't return less than requested
// unless it hit the end of the input.
// - If the uncompressed size is known, we know when there
// shouldn't be more data coming. We still need to read
// one byte to let the filter chain catch errors and to
// let it read end of payload marker(s).
if (ret < len || uncompressedSize == uncompressedSizeInHeader) {
if (filterChain.read() != -1) throw new CorruptedInputException();
validate();
endReached = true;
}
} else if (ret == -1) {
validate();
endReached = true;
}
return ret;
}
public long getUnpaddedSize() {
return headerSize + inCounted.getSize() + check.getSize();
}