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1 | class EncodindsCheck implements Checker { | |
2 | private static final int UTF8_HEADER_SIZE = 8; | |
3 | ||
4 | @Override | |
5 | public boolean check(File currentFile) { | |
6 | - | if (isUTF8(currentFile)) { |
6 | + | return isUTF8(currentFile); |
7 | - | return true; |
7 | + | |
8 | - | } else { |
8 | + | |
9 | - | return false; |
9 | + | |
10 | // validate input | |
11 | if (null == file) { | |
12 | throw new IllegalArgumentException("input file can't be null"); | |
13 | } | |
14 | if (file.isDirectory()) { | |
15 | throw new IllegalArgumentException( | |
16 | "input file refers to a directory"); | |
17 | } | |
18 | ||
19 | // read input file | |
20 | byte[] buffer; | |
21 | try { | |
22 | buffer = readUTFHeaderBytes(file); | |
23 | } catch (IOException e) { | |
24 | throw new IllegalArgumentException( | |
25 | "Can't read input file, error = " + e.getLocalizedMessage()); | |
26 | } | |
27 | ||
28 | if ((buffer[0] & 0xF8) == 0xF0) { | |
29 | if (((buffer[1] & 0xC0) == 0x80) | |
30 | && ((buffer[2] == 0x80) && ((buffer[3] == 0x80)))) | |
31 | return true; | |
32 | } else if ((buffer[0] & 0xF0) == 0xE0) { | |
33 | if (((buffer[1] & 0xC0) == 0x80) && ((buffer[2] & 0xC0) == 0x80)) | |
34 | return true; | |
35 | } else if ((buffer[0] & 0xE0) == 0xC0) { | |
36 | if (((buffer[1] & 0xC0) == 0x80)) | |
37 | return true; | |
38 | } | |
39 | ||
40 | return false; | |
41 | } | |
42 | ||
43 | private static byte[] readUTFHeaderBytes(File input) throws IOException { | |
44 | byte[] buffer = new byte[UTF8_HEADER_SIZE]; | |
45 | // read data | |
46 | FileInputStream fis = new FileInputStream(input); | |
47 | fis.read(buffer); | |
48 | fis.close(); | |
49 | return buffer; | |
50 | } | |
51 | } |