protected Header readHeaderFromStream(InputStream is) throws IOException {
ReadableByteChannel channel = Channels.newChannel(is);
// Read header fixed portion
ByteBuffer headerBuffer = ShapefileUtils.readByteChannelToBuffer(channel, FIXED_HEADER_LENGTH);
Header header = this.readHeaderFromBuffer(headerBuffer);
// Read fields description header
int fieldsHeaderLength = header.headerLength - FIXED_HEADER_LENGTH;
header.fieldsHeaderBuffer = ShapefileUtils.readByteChannelToBuffer(channel, fieldsHeaderLength);
return header;
}
