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      1 /*
      2  ******************************************************************************
      3  * Copyright (C) 2004, International Business Machines Corporation and        *
      4  * others. All Rights Reserved.                                               *
      5  ******************************************************************************
      6  */
      7 
      8 package org.unicode.cldr.util;
      9 
     10 import java.io.IOException;
     11 import java.io.InputStream;
     12 
     13 class StripUTF8BOMInputStream extends InputStream {
     14     InputStream base;
     15 
     16     StripUTF8BOMInputStream(InputStream base) {
     17         this.base = base;
     18     }
     19 
     20     boolean checkForUTF8BOM = true;
     21 
     22     /*
     23      * (non-Javadoc)
     24      *
     25      * @see java.io.InputStream#read()
     26      */
     27     public int read() throws IOException {
     28         int result = base.read();
     29         if (!checkForUTF8BOM) return result;
     30         // complicated by still wanting to do one delegate read per read
     31         // so we just skip first char if it starts with EF, assuming valid UTF-8
     32         checkForUTF8BOM = false;
     33         if (result != 0xEF) return result;
     34         result = base.read();
     35         result = base.read();
     36         result = base.read();
     37         return result;
     38     }
     39 
     40 }