public InputStreamWrapper(InputStream is, byte[] boundary) {
_wrapped = is;
_boundary = Arrays.copyOf(BOUNDARY_PREFIX, BOUNDARY_PREFIX.length + boundary.length);
System.arraycopy(boundary, 0, _boundary, BOUNDARY_PREFIX.length, boundary.length);
_lookAheadBuf = new byte[_boundary.length];
_lookAheadLen = 0;
}
private int readInternal(byte b[], int off, int len) throws IOException {
if (len < _lookAheadLen) {
System.arraycopy(_lookAheadBuf, 0, b, off, len);
_lookAheadLen -= len;
System.arraycopy(_lookAheadBuf, len, _lookAheadBuf, 0, _lookAheadLen);
return len;
}
if (_lookAheadLen > 0) {
System.arraycopy(_lookAheadBuf, 0, b, off, _lookAheadLen);
off += _lookAheadLen;
len -= _lookAheadLen;
int r = Math.max(_wrapped.read(b, off, len), 0) + _lookAheadLen;
_lookAheadLen = 0;
return r;
} else {
return _wrapped.read(b, off, len);
}
}