纯真IP数据库格式详解

} else

loc.country = readString(countryOffset);

// 读取地区标志

loc.area = readArea(ipFile.getFilePointer());

} else if(b == REDIRECT_MODE_2) {

loc.country = readString(readLong3());

loc.area = readArea(offset + 8);

} else {

loc.country = readString(ipFile.getFilePointer() - 1);

loc.area = readArea(ipFile.getFilePointer());

}

return loc;

} catch (IOException e) {

return null;

}

}

/**

* 从offset偏移开始解析后面的字节，读出一个地区名

* @param offset 地区记录的起始偏移

* @return 地区名字符串

* @throws IOException 地区名字符串

*/

private String readArea(long offset) throws IOException {

ipFile.seek(offset);

byte b = ipFile.readByte();

if(b == REDIRECT_MODE_1 || b == REDIRECT_MODE_2) {

long areaOffset = readLong3(offset + 1);